Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

756 files changed, 38139 insertions, 0 deletions

diff --git a/dom/webidl/APZTestData.webidl b/dom/webidl/APZTestData.webidl
new file mode 100644
index 0000000000..5926e591cd
--- /dev/null
+++ b/dom/webidl/APZTestData.webidl
@@ -0,0 +1,92 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * This file declares data structures used to communicate data logged by
+ * various components for the purpose of APZ testing (see bug 961289 and
+ * gfx/layers/apz/test/APZTestData.h) to JS test code.
+ */
+
+// A single key-value pair in the data.
+dictionary ScrollFrameDataEntry {
+  DOMString key;
+  DOMString value;
+};
+
+// All the key-value pairs associated with a given scrollable frame.
+// The scrollable frame is identified by a scroll id.
+dictionary ScrollFrameData {
+  unsigned long long scrollId;
+  sequence<ScrollFrameDataEntry> entries;
+};
+
+// All the scrollable frames associated with a given paint or repaint request.
+// The paint or repaint request is identified by a sequence number.
+dictionary APZBucket {
+  unsigned long sequenceNumber;
+  sequence<ScrollFrameData> scrollFrames;
+};
+
+[Pref="apz.test.logging_enabled",
+ Exposed=Window]
+namespace APZHitResultFlags {
+  // These constants should be kept in sync with mozilla::gfx::CompositorHitTestInfo
+  const unsigned short INVISIBLE = 0;
+  const unsigned short VISIBLE = 0x0001;
+  const unsigned short IRREGULAR_AREA = 0x0002;
+  const unsigned short APZ_AWARE_LISTENERS = 0x0004;
+  const unsigned short INACTIVE_SCROLLFRAME = 0x0008;
+  const unsigned short PAN_X_DISABLED = 0x0010;
+  const unsigned short PAN_Y_DISABLED = 0x0020;
+  const unsigned short PINCH_ZOOM_DISABLED = 0x0040;
+  const unsigned short DOUBLE_TAP_ZOOM_DISABLED = 0x0080;
+  const unsigned short SCROLLBAR = 0x0100;
+  const unsigned short SCROLLBAR_THUMB = 0x0200;
+  const unsigned short SCROLLBAR_VERTICAL = 0x0400;
+  const unsigned short REQUIRES_TARGET_CONFIRMATION = 0x0800;
+};
+
+dictionary APZHitResult {
+  float screenX;
+  float screenY;
+  unsigned short hitResult; // combination of the APZHitResultFlags.* flags
+  unsigned long long layersId;
+  unsigned long long scrollId;
+};
+
+dictionary APZSampledResult {
+  float scrollOffsetX;
+  float scrollOffsetY;
+  DOMHighResTimeStamp sampledTimeStamp;
+  unsigned long long layersId;
+  unsigned long long scrollId;
+};
+
+dictionary AdditionalDataEntry {
+  DOMString key;
+  DOMString value;
+};
+
+// All the paints and repaint requests. This is the top-level data structure.
+[GenerateConversionToJS]
+dictionary APZTestData {
+  sequence<APZBucket> paints;
+  sequence<APZBucket> repaintRequests;
+  sequence<APZHitResult> hitResults;
+  sequence<APZSampledResult> sampledResults;
+  sequence<AdditionalDataEntry> additionalData;
+};
+
+// A frame uniformity measurement for every scrollable layer
+dictionary FrameUniformity {
+  unsigned long layerAddress;
+  float frameUniformity;
+};
+
+[GenerateConversionToJS]
+dictionary FrameUniformityResults {
+  sequence<FrameUniformity> layerUniformities;
+};
diff --git a/dom/webidl/AbortController.webidl b/dom/webidl/AbortController.webidl
new file mode 100644
index 0000000000..2b172b7718
--- /dev/null
+++ b/dom/webidl/AbortController.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#abortcontroller
+ */
+
+[Exposed=(Window,Worker)]
+interface AbortController {
+  [Throws]
+  constructor();
+
+  [SameObject] readonly attribute AbortSignal signal;
+
+  undefined abort(optional any reason);
+};
diff --git a/dom/webidl/AbortSignal.webidl b/dom/webidl/AbortSignal.webidl
new file mode 100644
index 0000000000..5a87bc482c
--- /dev/null
+++ b/dom/webidl/AbortSignal.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#abortsignal
+ */
+
+[Exposed=*]
+interface AbortSignal : EventTarget {
+  [NewObject] static AbortSignal abort(optional any reason);
+  [Exposed=(Window,Worker), NewObject, Throws]
+  static AbortSignal timeout([EnforceRange] unsigned long long milliseconds);
+
+  readonly attribute boolean aborted;
+  readonly attribute any reason;
+  [Throws] undefined throwIfAborted();
+
+  attribute EventHandler onabort;
+};
diff --git a/dom/webidl/AbstractRange.webidl b/dom/webidl/AbstractRange.webidl
new file mode 100644
index 0000000000..abd4789212
--- /dev/null
+++ b/dom/webidl/AbstractRange.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#abstractrange
+ *
+ * Copyright  2012 W3C  (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface AbstractRange {
+  [BinaryName="GetStartContainer"]
+  readonly attribute Node startContainer;
+  readonly attribute unsigned long startOffset;
+  [BinaryName="GetEndContainer"]
+  readonly attribute Node endContainer;
+  readonly attribute unsigned long endOffset;
+  readonly attribute boolean collapsed;
+};
diff --git a/dom/webidl/AbstractWorker.webidl b/dom/webidl/AbstractWorker.webidl
new file mode 100644
index 0000000000..28f5dce589
--- /dev/null
+++ b/dom/webidl/AbstractWorker.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=(Window,Worker)]
+interface mixin AbstractWorker {
+    attribute EventHandler onerror;
+};
diff --git a/dom/webidl/AccessibilityRole.webidl b/dom/webidl/AccessibilityRole.webidl
new file mode 100644
index 0000000000..e7da79d6be
--- /dev/null
+++ b/dom/webidl/AccessibilityRole.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://rawgit.com/w3c/aria/master/#AccessibilityRole
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin AccessibilityRole {
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString role;
+};
diff --git a/dom/webidl/AccessibleNode.webidl b/dom/webidl/AccessibleNode.webidl
new file mode 100644
index 0000000000..fe1d843727
--- /dev/null
+++ b/dom/webidl/AccessibleNode.webidl
@@ -0,0 +1,80 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Func="mozilla::dom::AccessibleNode::IsAOMEnabled",
+ Exposed=Window]
+interface AccessibleNode {
+  readonly attribute DOMString computedRole;
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<DOMString> states;
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<DOMString> attributes;
+  readonly attribute Node? DOMNode;
+
+  boolean is(DOMString... states);
+  boolean has(DOMString... attributes);
+  [Throws]
+  any get(DOMString attribute);
+
+  attribute DOMString? role;
+  attribute DOMString? roleDescription;
+
+  // Accessible label and descriptor
+  attribute DOMString? label;
+
+  // Global states and properties
+  attribute DOMString? current;
+
+  // Accessible properties
+  attribute DOMString? autocomplete;
+  attribute DOMString? keyShortcuts;
+  attribute boolean? modal;
+  attribute boolean? multiline;
+  attribute boolean? multiselectable;
+  attribute DOMString? orientation;
+  attribute boolean? readOnly;
+  attribute boolean? required;
+  attribute DOMString? sort;
+
+  // Range values
+  attribute DOMString? placeholder;
+  attribute double? valueMax;
+  attribute double? valueMin;
+  attribute double? valueNow;
+  attribute DOMString? valueText;
+
+  // Accessible states
+  attribute DOMString? checked;
+  attribute boolean? disabled;
+  attribute boolean? expanded;
+  attribute DOMString? hasPopUp;
+  attribute boolean? hidden;
+  attribute DOMString? invalid;
+  attribute DOMString? pressed;
+  attribute boolean? selected;
+
+  // Live regions
+  attribute boolean? atomic;
+  attribute boolean? busy;
+  attribute DOMString? live;
+  attribute DOMString? relevant;
+
+  // Other relationships
+  attribute AccessibleNode? activeDescendant;
+  attribute AccessibleNode? details;
+  attribute AccessibleNode? errorMessage;
+
+  // Collections.
+  attribute long? colCount;
+  attribute unsigned long? colIndex;
+  attribute unsigned long? colSpan;
+  attribute unsigned long? level;
+  attribute unsigned long? posInSet;
+  attribute long? rowCount;
+  attribute unsigned long? rowIndex;
+  attribute unsigned long? rowSpan;
+  attribute long? setSize;
+};
diff --git a/dom/webidl/AddonEvent.webidl b/dom/webidl/AddonEvent.webidl
new file mode 100644
index 0000000000..0f0e916e4d
--- /dev/null
+++ b/dom/webidl/AddonEvent.webidl
@@ -0,0 +1,11 @@
+[Func="mozilla::AddonManagerWebAPI::IsAPIEnabled",
+ Exposed=Window]
+interface AddonEvent : Event {
+  constructor(DOMString type, AddonEventInit eventInitDict);
+
+  readonly attribute DOMString id;
+};
+
+dictionary AddonEventInit : EventInit {
+  required DOMString id;
+};
diff --git a/dom/webidl/AddonManager.webidl b/dom/webidl/AddonManager.webidl
new file mode 100644
index 0000000000..d392b90fb9
--- /dev/null
+++ b/dom/webidl/AddonManager.webidl
@@ -0,0 +1,106 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/* We need a JSImplementation but cannot get one without a contract ID.
+   Since Addon and AddonInstall are only ever created from JS they don't need
+   real contract IDs. */
+[ChromeOnly, JSImplementation="dummy",
+ Exposed=Window]
+interface Addon {
+  // The add-on's ID.
+  readonly attribute DOMString id;
+  // The add-on's version.
+  readonly attribute DOMString version;
+  // The add-on's type (extension, theme, etc.).
+  readonly attribute DOMString type;
+  // The add-on's name in the current locale.
+  readonly attribute DOMString name;
+  // The add-on's description in the current locale.
+  readonly attribute DOMString description;
+  // If the user has enabled this add-on, note that it still may not be running
+  // depending on whether enabling requires a restart or if the add-on is
+  // incompatible in some way.
+  readonly attribute boolean isEnabled;
+  // If the add-on is currently active in the browser.
+  readonly attribute boolean isActive;
+  // If the add-on may be uninstalled
+  readonly attribute boolean canUninstall;
+
+  Promise<boolean> uninstall();
+  Promise<undefined> setEnabled(boolean value);
+};
+
+[ChromeOnly, JSImplementation="dummy",
+ Exposed=Window]
+interface AddonInstall : EventTarget {
+  // One of the STATE_* symbols from AddonManager.jsm
+  readonly attribute DOMString state;
+  // One of the ERROR_* symbols from AddonManager.jsm, or null
+  readonly attribute DOMString? error;
+  // How many bytes have been downloaded
+  readonly attribute long long progress;
+  // How many total bytes will need to be downloaded or -1 if unknown
+  readonly attribute long long maxProgress;
+
+  Promise<undefined> install();
+  Promise<undefined> cancel();
+};
+
+dictionary addonInstallOptions {
+  required DOMString url;
+  // If a non-empty string is passed for "hash", it is used to verify the
+  // checksum of the downloaded XPI before installing.  If is omitted or if
+  // it is null or empty string, no checksum verification is performed.
+  DOMString? hash = null;
+};
+
+[HeaderFile="mozilla/AddonManagerWebAPI.h",
+ Func="mozilla::AddonManagerWebAPI::IsAPIEnabled",
+ JSImplementation="@mozilla.org/addon-web-api/manager;1",
+ WantsEventListenerHooks,
+ Exposed=Window]
+interface AddonManager : EventTarget {
+  /**
+   * Gets information about an add-on
+   *
+   * @param  id
+   *         The ID of the add-on to test for.
+   * @return A promise. It will resolve to an Addon if the add-on is installed.
+   */
+  Promise<Addon> getAddonByID(DOMString id);
+
+  /**
+   * Creates an AddonInstall object for a given URL.
+   *
+   * @param options
+   *        Only one supported option: 'url', the URL of the addon to install.
+   * @return A promise that resolves to an instance of AddonInstall.
+   */
+  Promise<AddonInstall> createInstall(optional addonInstallOptions options = {});
+
+  /**
+   * Opens an Abuse Report dialog window for the addon with the given id.
+   * The addon may be currently installed (in which case the report will
+   * include the details available locally), or not (in which case the report
+   * will include the details that can be retrieved from the AMO API endpoint).
+   *
+   * @param  id
+   *         The ID of the add-on to report.
+   * @return A promise that resolves to a boolean (true when the report
+   *         has been submitted successfully, false if the user cancelled
+   *         the report). The Promise is rejected is the report fails
+   *         for a reason other than user cancellation.
+   */
+  Promise<boolean> reportAbuse(DOMString id);
+
+  // Indicator to content whether handing off the reports to the integrated
+  // abuse report panel is enabled.
+  readonly attribute boolean abuseReportPanelEnabled;
+};
+
+[ChromeOnly,Exposed=Window,HeaderFile="mozilla/AddonManagerWebAPI.h"]
+namespace AddonManagerPermissions {
+  boolean isHostPermitted(DOMString host);
+};
diff --git a/dom/webidl/AnalyserNode.webidl b/dom/webidl/AnalyserNode.webidl
new file mode 100644
index 0000000000..e7ed151d9d
--- /dev/null
+++ b/dom/webidl/AnalyserNode.webidl
@@ -0,0 +1,51 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary AnalyserOptions : AudioNodeOptions {
+             unsigned long fftSize = 2048;
+             double        maxDecibels = -30;
+             double        minDecibels = -100;
+             double        smoothingTimeConstant = 0.8;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface AnalyserNode : AudioNode {
+    [Throws]
+    constructor(BaseAudioContext context,
+                optional AnalyserOptions options = {});
+
+    // Real-time frequency-domain data
+    undefined getFloatFrequencyData(Float32Array array);
+    undefined getByteFrequencyData(Uint8Array array);
+
+    // Real-time waveform data
+    undefined getFloatTimeDomainData(Float32Array array);
+    undefined getByteTimeDomainData(Uint8Array array);
+
+    [SetterThrows, Pure]
+    attribute unsigned long fftSize;
+    [Pure]
+    readonly attribute unsigned long frequencyBinCount;
+
+    [SetterThrows, Pure]
+    attribute double minDecibels;
+    [SetterThrows, Pure]
+    attribute double maxDecibels;
+
+    [SetterThrows, Pure]
+    attribute double smoothingTimeConstant;
+
+};
+
+// Mozilla extension
+AnalyserNode includes AudioNodePassThrough;
diff --git a/dom/webidl/Animatable.webidl b/dom/webidl/Animatable.webidl
new file mode 100644
index 0000000000..432c9ca856
--- /dev/null
+++ b/dom/webidl/Animatable.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/fxtf/web-animations/#the-animatable-interface
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary KeyframeAnimationOptions : KeyframeEffectOptions {
+  DOMString id = "";
+};
+
+dictionary GetAnimationsOptions {
+  boolean subtree = false;
+};
+
+interface mixin Animatable {
+  [Throws]
+  Animation animate(object? keyframes,
+                    optional UnrestrictedDoubleOrKeyframeAnimationOptions options = {});
+  [Func="Document::IsWebAnimationsGetAnimationsEnabled"]
+  sequence<Animation> getAnimations(optional GetAnimationsOptions options = {});
+};
diff --git a/dom/webidl/Animation.webidl b/dom/webidl/Animation.webidl
new file mode 100644
index 0000000000..ae4403380c
--- /dev/null
+++ b/dom/webidl/Animation.webidl
@@ -0,0 +1,70 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#animation
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum AnimationPlayState { "idle", "running", "paused", "finished" };
+
+enum AnimationReplaceState { "active", "removed", "persisted" };
+
+[Exposed=Window]
+interface Animation : EventTarget {
+  [Throws]
+  constructor(optional AnimationEffect? effect = null,
+              optional AnimationTimeline? timeline);
+
+  attribute DOMString id;
+  [Func="Document::IsWebAnimationsEnabled", Pure]
+  attribute AnimationEffect? effect;
+  // Bug 1676794. Drop BinaryName once we support ScrollTimeline interface.
+  [Func="Document::AreWebAnimationsTimelinesEnabled",
+   BinaryName="timelineFromJS"]
+  attribute AnimationTimeline? timeline;
+
+  [BinaryName="startTimeAsDouble"]
+  attribute double? startTime;
+  [SetterThrows, BinaryName="currentTimeAsDouble"]
+  attribute double? currentTime;
+
+           attribute double             playbackRate;
+  [BinaryName="playStateFromJS"]
+  readonly attribute AnimationPlayState playState;
+  [BinaryName="pendingFromJS"]
+  readonly attribute boolean            pending;
+  [Pref="dom.animations-api.autoremove.enabled"]
+  readonly attribute AnimationReplaceState replaceState;
+  [Func="Document::IsWebAnimationsEnabled", Throws]
+  readonly attribute Promise<Animation> ready;
+  [Func="Document::IsWebAnimationsEnabled", Throws]
+  readonly attribute Promise<Animation> finished;
+           attribute EventHandler       onfinish;
+           attribute EventHandler       oncancel;
+  [Pref="dom.animations-api.autoremove.enabled"]
+           attribute EventHandler       onremove;
+  undefined cancel();
+  [Throws]
+  undefined finish();
+  [Throws, BinaryName="playFromJS"]
+  undefined play();
+  [Throws, BinaryName="pauseFromJS"]
+  undefined pause();
+  undefined updatePlaybackRate (double playbackRate);
+  [Throws]
+  undefined reverse();
+  [Pref="dom.animations-api.autoremove.enabled"]
+  undefined persist();
+  [CEReactions, Pref="dom.animations-api.autoremove.enabled", Throws]
+  undefined commitStyles();
+};
+
+// Non-standard extensions
+partial interface Animation {
+  [ChromeOnly] readonly attribute boolean isRunningOnCompositor;
+};
diff --git a/dom/webidl/AnimationEffect.webidl b/dom/webidl/AnimationEffect.webidl
new file mode 100644
index 0000000000..9e93c1f693
--- /dev/null
+++ b/dom/webidl/AnimationEffect.webidl
@@ -0,0 +1,66 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#animationeffectreadonly
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum FillMode {
+  "none",
+  "forwards",
+  "backwards",
+  "both",
+  "auto"
+};
+
+enum PlaybackDirection {
+  "normal",
+  "reverse",
+  "alternate",
+  "alternate-reverse"
+};
+
+dictionary EffectTiming {
+  double                              delay = 0.0;
+  double                              endDelay = 0.0;
+  FillMode                            fill = "auto";
+  double                              iterationStart = 0.0;
+  unrestricted double                 iterations = 1.0;
+  (unrestricted double or DOMString)  duration = "auto";
+  PlaybackDirection                   direction = "normal";
+  UTF8String                          easing = "linear";
+};
+
+dictionary OptionalEffectTiming {
+  double                              delay;
+  double                              endDelay;
+  FillMode                            fill;
+  double                              iterationStart;
+  unrestricted double                 iterations;
+  (unrestricted double or DOMString)  duration;
+  PlaybackDirection                   direction;
+  UTF8String                          easing;
+};
+
+dictionary ComputedEffectTiming : EffectTiming {
+  unrestricted double   endTime = 0.0;
+  unrestricted double   activeDuration = 0.0;
+  double?               localTime = null;
+  double?               progress = null;
+  unrestricted double?  currentIteration = null;
+};
+
+[Func="Document::IsWebAnimationsEnabled",
+ Exposed=Window]
+interface AnimationEffect {
+  EffectTiming getTiming();
+  [BinaryName="getComputedTimingAsDict"]
+  ComputedEffectTiming getComputedTiming();
+  [Throws]
+  undefined updateTiming(optional OptionalEffectTiming timing = {});
+};
diff --git a/dom/webidl/AnimationEvent.webidl b/dom/webidl/AnimationEvent.webidl
new file mode 100644
index 0000000000..ae401948a7
--- /dev/null
+++ b/dom/webidl/AnimationEvent.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/css3-animations/#animation-events-
+ * http://dev.w3.org/csswg/css3-animations/#animation-events-
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface AnimationEvent : Event {
+  constructor(DOMString type, optional AnimationEventInit eventInitDict = {});
+
+  readonly attribute DOMString animationName;
+  readonly attribute float     elapsedTime;
+  readonly attribute DOMString pseudoElement;
+};
+
+dictionary AnimationEventInit : EventInit {
+  DOMString animationName = "";
+  float elapsedTime = 0;
+  DOMString pseudoElement = "";
+};
diff --git a/dom/webidl/AnimationFrameProvider.webidl b/dom/webidl/AnimationFrameProvider.webidl
new file mode 100644
index 0000000000..2932698c3b
--- /dev/null
+++ b/dom/webidl/AnimationFrameProvider.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#animation-frames
+ */
+
+callback FrameRequestCallback = undefined (DOMHighResTimeStamp time);
+
+interface mixin AnimationFrameProvider {
+  [Throws] long requestAnimationFrame(FrameRequestCallback callback);
+  [Throws] undefined cancelAnimationFrame(long handle);
+};
diff --git a/dom/webidl/AnimationPlaybackEvent.webidl b/dom/webidl/AnimationPlaybackEvent.webidl
new file mode 100644
index 0000000000..c88aea7b98
--- /dev/null
+++ b/dom/webidl/AnimationPlaybackEvent.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#animationplaybackevent
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="Document::IsWebAnimationsEnabled",
+ Exposed=Window]
+interface AnimationPlaybackEvent : Event {
+  constructor(DOMString type,
+              optional AnimationPlaybackEventInit eventInitDict = {});
+
+  readonly attribute double? currentTime;
+  readonly attribute double? timelineTime;
+};
+
+dictionary AnimationPlaybackEventInit : EventInit {
+  double? currentTime = null;
+  double? timelineTime = null;
+};
diff --git a/dom/webidl/AnimationTimeline.webidl b/dom/webidl/AnimationTimeline.webidl
new file mode 100644
index 0000000000..5b46c9cf95
--- /dev/null
+++ b/dom/webidl/AnimationTimeline.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#animationtimeline
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="Document::AreWebAnimationsTimelinesEnabled",
+ Exposed=Window]
+interface AnimationTimeline {
+  [BinaryName="currentTimeAsDouble"]
+  readonly attribute double? currentTime;
+};
diff --git a/dom/webidl/AnonymousContent.webidl b/dom/webidl/AnonymousContent.webidl
new file mode 100644
index 0000000000..3dd6fd0264
--- /dev/null
+++ b/dom/webidl/AnonymousContent.webidl
@@ -0,0 +1,100 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * This file declares the AnonymousContent interface which is used to
+ * manipulate content that has been inserted into the document's canvasFrame
+ * anonymous container.
+ * See Document.insertAnonymousContent.
+ *
+ * This API never returns a reference to the actual inserted DOM node on
+ * purpose. This is to make sure the content cannot be randomly changed and the
+ * DOM cannot be traversed from the node, so that Gecko can remain in control of
+ * the inserted content.
+ */
+
+[ChromeOnly, Exposed=Window]
+interface AnonymousContent {
+  /**
+   * Get the text content of an element inside this custom anonymous content.
+   */
+  [Throws]
+  DOMString getTextContentForElement(DOMString elementId);
+
+  /**
+   * Set the text content of an element inside this custom anonymous content.
+   */
+  [Throws]
+  undefined setTextContentForElement(DOMString elementId, DOMString text);
+
+  /**
+   * Get the value of an attribute of an element inside this custom anonymous
+   * content.
+   */
+  [Throws]
+  DOMString? getAttributeForElement(DOMString elementId,
+                                    DOMString attributeName);
+
+  /**
+   * Set the value of an attribute of an element inside this custom anonymous
+   * content.
+   */
+  [NeedsSubjectPrincipal=NonSystem, Throws]
+  undefined setAttributeForElement(DOMString elementId,
+                                   DOMString attributeName,
+                                   DOMString value);
+
+  /**
+   * Remove an attribute from an element inside this custom anonymous content.
+   */
+  [Throws]
+  undefined removeAttributeForElement(DOMString elementId,
+                                      DOMString attributeName);
+
+  /**
+   * Get the canvas' context for the element specified if it's a <canvas>
+   * node, `null` otherwise.
+   */
+  [Throws]
+  nsISupports? getCanvasContext(DOMString elementId,
+                                DOMString contextId);
+
+  [Throws]
+  Animation setAnimationForElement(DOMString elementId,
+                                   object? keyframes,
+                                   optional UnrestrictedDoubleOrKeyframeAnimationOptions
+                                     options = {});
+
+  /**
+   * Accepts a list of (possibly overlapping) DOMRects which describe a shape
+   * in CSS pixels relative to the element's border box. This shape will be
+   * excluded from the element's background color rendering. The element will
+   * not render any background images once this method has been called.
+   */
+  [Throws]
+  undefined setCutoutRectsForElement(DOMString elementId,
+                                     sequence<DOMRect> rects);
+
+  /**
+   * Get the computed value of a property on an element inside this custom
+   * anonymous content.
+   */
+  [Throws]
+  UTF8String? getComputedStylePropertyValue(DOMString elementId,
+                                            UTF8String propertyName);
+
+  /**
+   * If event's original target is in the anonymous content, this returns the id
+   * attribute value of the target.
+   */
+  DOMString? getTargetIdForEvent(Event event);
+
+  /**
+   * Set given style to this AnonymousContent.
+   */
+  [Throws]
+  undefined setStyle(UTF8String property, UTF8String value);
+};
diff --git a/dom/webidl/AppInfo.webidl b/dom/webidl/AppInfo.webidl
new file mode 100644
index 0000000000..a4f44d46c2
--- /dev/null
+++ b/dom/webidl/AppInfo.webidl
@@ -0,0 +1,12 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+  * This dictionnary holds the parameters supporting the app:// protocol.
+  */
+dictionary AppInfo
+{
+  DOMString path = "";
+  boolean   isCoreApp = false;
+};
diff --git a/dom/webidl/AppNotificationServiceOptions.webidl b/dom/webidl/AppNotificationServiceOptions.webidl
new file mode 100644
index 0000000000..809857e59b
--- /dev/null
+++ b/dom/webidl/AppNotificationServiceOptions.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface MozObserver;
+
+dictionary AppNotificationServiceOptions {
+  boolean textClickable = false;
+  DOMString manifestURL = "";
+  DOMString id = "";
+  DOMString dbId = "";
+  DOMString dir = "";
+  DOMString lang = "";
+  DOMString tag = "";
+  DOMString data = "";
+  NotificationBehavior mozbehavior = {};
+};
diff --git a/dom/webidl/AriaAttributes.webidl b/dom/webidl/AriaAttributes.webidl
new file mode 100644
index 0000000000..6121002bb3
--- /dev/null
+++ b/dom/webidl/AriaAttributes.webidl
@@ -0,0 +1,136 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://rawgit.com/w3c/aria/master/#AriaAttributes
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin AriaAttributes {
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaAtomic;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaAutoComplete;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaBusy;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaChecked;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaColCount;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaColIndex;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaColIndexText;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaColSpan;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaCurrent;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaDescription;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaDisabled;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaExpanded;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaHasPopup;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaHidden;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaInvalid;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaKeyShortcuts;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaLabel;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaLevel;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaLive;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaModal;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaMultiLine;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaMultiSelectable;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaOrientation;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaPlaceholder;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaPosInSet;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaPressed;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaReadOnly;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaRelevant;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaRequired;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaRoleDescription;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaRowCount;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaRowIndex;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaRowIndexText;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaRowSpan;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaSelected;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaSetSize;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaSort;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaValueMax;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaValueMin;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaValueNow;
+
+  [Pref="accessibility.ARIAReflection.enabled", CEReactions, SetterThrows]
+  attribute DOMString ariaValueText;
+};
diff --git a/dom/webidl/Attr.webidl b/dom/webidl/Attr.webidl
new file mode 100644
index 0000000000..52759b29ba
--- /dev/null
+++ b/dom/webidl/Attr.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface Attr : Node {
+  readonly attribute DOMString localName;
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString value;
+
+  [Constant]
+  readonly attribute DOMString name;
+  [Constant]
+  readonly attribute DOMString? namespaceURI;
+  [Constant]
+  readonly attribute DOMString? prefix;
+
+  readonly attribute boolean specified;
+};
+
+// Mozilla extensions
+
+partial interface Attr {
+  readonly attribute Element? ownerElement;
+};
diff --git a/dom/webidl/AudioBuffer.webidl b/dom/webidl/AudioBuffer.webidl
new file mode 100644
index 0000000000..f94cf43f9c
--- /dev/null
+++ b/dom/webidl/AudioBuffer.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary AudioBufferOptions {
+             unsigned long numberOfChannels = 1;
+    required unsigned long length;
+    required float         sampleRate;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface AudioBuffer {
+    [Throws]
+    constructor(AudioBufferOptions options);
+
+    readonly attribute float sampleRate;
+    readonly attribute unsigned long length;
+
+    // in seconds
+    readonly attribute double duration;
+
+    readonly attribute unsigned long numberOfChannels;
+
+    [Throws]
+    Float32Array getChannelData(unsigned long channel);
+
+    [Throws]
+    undefined copyFromChannel(Float32Array destination, unsigned long channelNumber, optional unsigned long startInChannel = 0);
+    [Throws]
+    undefined copyToChannel(Float32Array source, unsigned long channelNumber, optional unsigned long startInChannel = 0);
+};
diff --git a/dom/webidl/AudioBufferSourceNode.webidl b/dom/webidl/AudioBufferSourceNode.webidl
new file mode 100644
index 0000000000..7c0f91441a
--- /dev/null
+++ b/dom/webidl/AudioBufferSourceNode.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary AudioBufferSourceOptions {
+             AudioBuffer? buffer;
+             float        detune = 0;
+             boolean      loop = false;
+             double       loopEnd = 0;
+             double       loopStart = 0;
+             float        playbackRate = 1;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface AudioBufferSourceNode : AudioScheduledSourceNode {
+    constructor(BaseAudioContext context,
+                optional AudioBufferSourceOptions options = {});
+
+    [SetterThrows]
+    attribute AudioBuffer? buffer;
+
+    readonly attribute AudioParam playbackRate;
+    readonly attribute AudioParam detune;
+
+    attribute boolean loop;
+    attribute double loopStart;
+    attribute double loopEnd;
+
+    [Throws]
+    undefined start(optional double when = 0, optional double grainOffset = 0,
+                    optional double grainDuration);
+};
+
+// Mozilla extensions
+AudioBufferSourceNode includes AudioNodePassThrough;
diff --git a/dom/webidl/AudioContext.webidl b/dom/webidl/AudioContext.webidl
new file mode 100644
index 0000000000..804cb127a7
--- /dev/null
+++ b/dom/webidl/AudioContext.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary AudioContextOptions {
+             float        sampleRate;
+};
+
+dictionary AudioTimestamp {
+  double contextTime;
+  DOMHighResTimeStamp performanceTime;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface AudioContext : BaseAudioContext {
+    [Throws]
+    constructor(optional AudioContextOptions contextOptions = {});
+
+    readonly        attribute double               baseLatency;
+    readonly        attribute double               outputLatency;
+    AudioTimestamp                  getOutputTimestamp();
+
+    [NewObject]
+    Promise<undefined> suspend();
+    [NewObject]
+    Promise<undefined> close();
+
+    [NewObject, Throws]
+    MediaElementAudioSourceNode createMediaElementSource(HTMLMediaElement mediaElement);
+
+    [NewObject, Throws]
+    MediaStreamAudioSourceNode createMediaStreamSource(MediaStream mediaStream);
+
+    [NewObject, Throws]
+    MediaStreamTrackAudioSourceNode createMediaStreamTrackSource(MediaStreamTrack mediaStreamTrack);
+
+    [NewObject, Throws]
+    MediaStreamAudioDestinationNode createMediaStreamDestination();
+};
diff --git a/dom/webidl/AudioDestinationNode.webidl b/dom/webidl/AudioDestinationNode.webidl
new file mode 100644
index 0000000000..1e27b141ad
--- /dev/null
+++ b/dom/webidl/AudioDestinationNode.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface AudioDestinationNode : AudioNode {
+
+    readonly attribute unsigned long maxChannelCount;
+
+};
diff --git a/dom/webidl/AudioListener.webidl b/dom/webidl/AudioListener.webidl
new file mode 100644
index 0000000000..8b9acc3dff
--- /dev/null
+++ b/dom/webidl/AudioListener.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface AudioListener {
+    // Uses a 3D cartesian coordinate system
+    undefined setPosition(double x, double y, double z);
+    undefined setOrientation(double x, double y, double z, double xUp, double yUp, double zUp);
+};
diff --git a/dom/webidl/AudioNode.webidl b/dom/webidl/AudioNode.webidl
new file mode 100644
index 0000000000..fbeed0e0b6
--- /dev/null
+++ b/dom/webidl/AudioNode.webidl
@@ -0,0 +1,75 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum ChannelCountMode {
+    "max",
+    "clamped-max",
+    "explicit"
+};
+
+enum ChannelInterpretation {
+    "speakers",
+    "discrete"
+};
+
+dictionary AudioNodeOptions {
+             unsigned long         channelCount;
+             ChannelCountMode      channelCountMode;
+             ChannelInterpretation channelInterpretation;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface AudioNode : EventTarget {
+
+    [Throws]
+    AudioNode connect(AudioNode destination, optional unsigned long output = 0, optional unsigned long input = 0);
+    [Throws]
+    undefined connect(AudioParam destination, optional unsigned long output = 0);
+    [Throws]
+    undefined disconnect();
+    [Throws]
+    undefined disconnect(unsigned long output);
+    [Throws]
+    undefined disconnect(AudioNode destination);
+    [Throws]
+    undefined disconnect(AudioNode destination, unsigned long output);
+    [Throws]
+    undefined disconnect(AudioNode destination, unsigned long output, unsigned long input);
+    [Throws]
+    undefined disconnect(AudioParam destination);
+    [Throws]
+    undefined disconnect(AudioParam destination, unsigned long output);
+
+    readonly attribute BaseAudioContext context;
+    readonly attribute unsigned long numberOfInputs;
+    readonly attribute unsigned long numberOfOutputs;
+
+    // Channel up-mixing and down-mixing rules for all inputs.
+    [SetterThrows]
+    attribute unsigned long channelCount;
+    [SetterThrows, BinaryName="channelCountModeValue"]
+    attribute ChannelCountMode channelCountMode;
+    [SetterThrows, BinaryName="channelInterpretationValue"]
+    attribute ChannelInterpretation channelInterpretation;
+
+};
+
+// Mozilla extension
+partial interface AudioNode {
+  [ChromeOnly]
+  readonly attribute unsigned long id;
+};
+interface mixin AudioNodePassThrough {
+  [ChromeOnly]
+  attribute boolean passThrough;
+};
diff --git a/dom/webidl/AudioParam.webidl b/dom/webidl/AudioParam.webidl
new file mode 100644
index 0000000000..e9b2b30ea6
--- /dev/null
+++ b/dom/webidl/AudioParam.webidl
@@ -0,0 +1,65 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#enumdef-automationrate
+ * https://webaudio.github.io/web-audio-api/#audioparam
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum AutomationRate {
+    "a-rate",
+    "k-rate"
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface AudioParam {
+    [SetterThrows]
+                    attribute float value;
+    readonly        attribute float defaultValue;
+    readonly        attribute float minValue;
+    readonly        attribute float maxValue;
+
+    // Parameter automation.
+    [Throws]
+    AudioParam setValueAtTime(float value, double startTime);
+    [Throws]
+    AudioParam linearRampToValueAtTime(float value, double endTime);
+    [Throws]
+    AudioParam exponentialRampToValueAtTime(float value, double endTime);
+
+    // Exponentially approach the target value with a rate having the given time constant.
+    [Throws]
+    AudioParam setTargetAtTime(float target, double startTime, double timeConstant);
+
+    // Sets an array of arbitrary parameter values starting at time for the given duration.
+    // The number of values will be scaled to fit into the desired duration.
+    [Throws]
+    AudioParam setValueCurveAtTime(sequence<float> values, double startTime, double duration);
+
+    // Cancels all scheduled parameter changes with times greater than or equal to startTime.
+    [Throws]
+    AudioParam cancelScheduledValues(double startTime);
+
+};
+
+// Mozilla extension
+partial interface AudioParam {
+  // The ID of the AudioNode this AudioParam belongs to.
+  [ChromeOnly]
+  readonly attribute unsigned long parentNodeId;
+  // The name of the AudioParam
+  [ChromeOnly]
+  readonly attribute DOMString name;
+};
+
+partial interface AudioParam {
+  // This attribute is used for mochitest only.
+  [ChromeOnly]
+  readonly attribute boolean isTrackSuspended;
+};
diff --git a/dom/webidl/AudioParamDescriptor.webidl b/dom/webidl/AudioParamDescriptor.webidl
new file mode 100644
index 0000000000..de2b007da0
--- /dev/null
+++ b/dom/webidl/AudioParamDescriptor.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#dictdef-audioparamdescriptor
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[GenerateInit]
+dictionary AudioParamDescriptor {
+    required DOMString name;
+    float defaultValue = 0;
+    float minValue = -3.4028235e38;
+    float maxValue = 3.4028235e38;
+    // AutomationRate for AudioWorklet is not needed until bug 1504984 is
+    // implemented
+    // AutomationRate automationRate = "a-rate";
+};
diff --git a/dom/webidl/AudioParamMap.webidl b/dom/webidl/AudioParamMap.webidl
new file mode 100644
index 0000000000..d2e1821329
--- /dev/null
+++ b/dom/webidl/AudioParamMap.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#audioparammap
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[SecureContext, Pref="dom.audioworklet.enabled",
+ Exposed=Window]
+interface AudioParamMap {
+    readonly maplike<DOMString, AudioParam>;
+};
diff --git a/dom/webidl/AudioProcessingEvent.webidl b/dom/webidl/AudioProcessingEvent.webidl
new file mode 100644
index 0000000000..ea86cff7eb
--- /dev/null
+++ b/dom/webidl/AudioProcessingEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface AudioProcessingEvent : Event {
+
+  readonly attribute double playbackTime;
+
+  [Throws]
+  readonly attribute AudioBuffer inputBuffer;
+  [Throws]
+  readonly attribute AudioBuffer outputBuffer;
+
+};
diff --git a/dom/webidl/AudioScheduledSourceNode.webidl b/dom/webidl/AudioScheduledSourceNode.webidl
new file mode 100644
index 0000000000..1b383f3e65
--- /dev/null
+++ b/dom/webidl/AudioScheduledSourceNode.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#idl-def-AudioScheduledSourceNode
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface AudioScheduledSourceNode : AudioNode {
+                    attribute EventHandler onended;
+    [Throws]
+    undefined start (optional double when = 0);
+
+    [Throws]
+    undefined stop (optional double when = 0);
+};
diff --git a/dom/webidl/AudioTrack.webidl b/dom/webidl/AudioTrack.webidl
new file mode 100644
index 0000000000..0f1ba81a24
--- /dev/null
+++ b/dom/webidl/AudioTrack.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#audiotrack
+ */
+
+[Pref="media.track.enabled",
+ Exposed=Window]
+interface AudioTrack {
+  readonly attribute DOMString id;
+  readonly attribute DOMString kind;
+  readonly attribute DOMString label;
+  readonly attribute DOMString language;
+           attribute boolean enabled;
+};
diff --git a/dom/webidl/AudioTrackList.webidl b/dom/webidl/AudioTrackList.webidl
new file mode 100644
index 0000000000..0a56d3ab3f
--- /dev/null
+++ b/dom/webidl/AudioTrackList.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#audiotracklist
+ */
+
+[Pref="media.track.enabled",
+ Exposed=Window]
+interface AudioTrackList : EventTarget {
+  readonly attribute unsigned long length;
+  getter AudioTrack (unsigned long index);
+  AudioTrack? getTrackById(DOMString id);
+
+           attribute EventHandler onchange;
+           attribute EventHandler onaddtrack;
+           attribute EventHandler onremovetrack;
+};
diff --git a/dom/webidl/AudioWorklet.webidl b/dom/webidl/AudioWorklet.webidl
new file mode 100644
index 0000000000..32e48facb3
--- /dev/null
+++ b/dom/webidl/AudioWorklet.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window, SecureContext, Pref="dom.audioworklet.enabled"]
+interface AudioWorklet : Worklet {
+};
diff --git a/dom/webidl/AudioWorkletGlobalScope.webidl b/dom/webidl/AudioWorkletGlobalScope.webidl
new file mode 100644
index 0000000000..b88ac82c66
--- /dev/null
+++ b/dom/webidl/AudioWorkletGlobalScope.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#audioworkletglobalscope
+ */
+
+callback constructor AudioWorkletProcessorConstructor = AudioWorkletProcessor (object options);
+
+[Global=(Worklet,AudioWorklet),Exposed=AudioWorklet]
+interface AudioWorkletGlobalScope : WorkletGlobalScope {
+    [Throws]
+    undefined registerProcessor (DOMString name, AudioWorkletProcessorConstructor processorCtor);
+    readonly  attribute   unsigned long long currentFrame;
+    readonly  attribute   double currentTime;
+    readonly  attribute   float sampleRate;
+};
diff --git a/dom/webidl/AudioWorkletNode.webidl b/dom/webidl/AudioWorkletNode.webidl
new file mode 100644
index 0000000000..929d4f9281
--- /dev/null
+++ b/dom/webidl/AudioWorkletNode.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[GenerateConversionToJS]
+dictionary AudioWorkletNodeOptions : AudioNodeOptions {
+             unsigned long             numberOfInputs = 1;
+             unsigned long             numberOfOutputs = 1;
+             sequence<unsigned long>   outputChannelCount;
+             record<DOMString, double> parameterData;
+             object                    processorOptions;
+};
+
+[SecureContext, Pref="dom.audioworklet.enabled",
+ Exposed=Window]
+interface AudioWorkletNode : AudioNode {
+    [Throws]
+    constructor(BaseAudioContext context, DOMString name,
+                optional AudioWorkletNodeOptions options = {});
+
+    [Throws]
+    readonly        attribute AudioParamMap              parameters;
+    readonly        attribute MessagePort                port;
+                    attribute EventHandler               onprocessorerror;
+};
diff --git a/dom/webidl/AudioWorkletProcessor.webidl b/dom/webidl/AudioWorkletProcessor.webidl
new file mode 100644
index 0000000000..3cbb226a76
--- /dev/null
+++ b/dom/webidl/AudioWorkletProcessor.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#audioworkletprocessor
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=AudioWorklet]
+interface AudioWorkletProcessor {
+  [Throws]
+  constructor();
+
+  readonly attribute MessagePort port;
+};
diff --git a/dom/webidl/AutocompleteInfo.webidl b/dom/webidl/AutocompleteInfo.webidl
new file mode 100644
index 0000000000..ebf2a3292c
--- /dev/null
+++ b/dom/webidl/AutocompleteInfo.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * This dictionary is used for the input, textarea and select element's
+ * getAutocompleteInfo method.
+ */
+
+dictionary AutocompleteInfo {
+  DOMString section = "";
+  DOMString addressType = "";
+  DOMString contactType = "";
+  DOMString fieldName = "";
+  boolean canAutomaticallyPersist = true;
+};
diff --git a/dom/webidl/BarProp.webidl b/dom/webidl/BarProp.webidl
new file mode 100644
index 0000000000..ccbeccca33
--- /dev/null
+++ b/dom/webidl/BarProp.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface BarProp
+{
+  [Throws, NeedsCallerType]
+           attribute boolean visible;
+};
diff --git a/dom/webidl/BaseAudioContext.webidl b/dom/webidl/BaseAudioContext.webidl
new file mode 100644
index 0000000000..509f039684
--- /dev/null
+++ b/dom/webidl/BaseAudioContext.webidl
@@ -0,0 +1,102 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#idl-def-BaseAudioContext
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+callback DecodeSuccessCallback = undefined (AudioBuffer decodedData);
+callback DecodeErrorCallback = undefined (DOMException error);
+
+enum AudioContextState {
+    "suspended",
+    "running",
+    "closed"
+};
+
+[Exposed=Window]
+interface BaseAudioContext : EventTarget {
+    readonly        attribute AudioDestinationNode destination;
+    readonly        attribute float                sampleRate;
+    readonly        attribute double               currentTime;
+    readonly        attribute AudioListener        listener;
+    readonly        attribute AudioContextState    state;
+    [Throws, SameObject, SecureContext, Pref="dom.audioworklet.enabled"]
+    readonly        attribute AudioWorklet         audioWorklet;
+
+    [NewObject]
+    Promise<undefined> resume();
+
+                    attribute EventHandler         onstatechange;
+
+    [NewObject, Throws]
+    AudioBuffer            createBuffer (unsigned long numberOfChannels,
+                                         unsigned long length,
+                                         float sampleRate);
+
+    [NewObject]
+    Promise<AudioBuffer> decodeAudioData(ArrayBuffer audioData,
+                                         optional DecodeSuccessCallback successCallback,
+                                         optional DecodeErrorCallback errorCallback);
+
+    // AudioNode creation
+    [NewObject]
+    AudioBufferSourceNode createBufferSource();
+
+    [NewObject]
+    ConstantSourceNode createConstantSource();
+
+    [NewObject, Throws]
+    ScriptProcessorNode createScriptProcessor(optional unsigned long bufferSize = 0,
+                                              optional unsigned long numberOfInputChannels = 2,
+                                              optional unsigned long numberOfOutputChannels = 2);
+
+    [NewObject, Throws]
+    AnalyserNode createAnalyser();
+
+    [NewObject, Throws]
+    GainNode createGain();
+
+    [NewObject, Throws]
+    DelayNode createDelay(optional double maxDelayTime = 1); // TODO: no = 1
+
+    [NewObject, Throws]
+    BiquadFilterNode createBiquadFilter();
+
+    [NewObject, Throws]
+    IIRFilterNode createIIRFilter(sequence<double> feedforward, sequence<double> feedback);
+
+    [NewObject, Throws]
+    WaveShaperNode createWaveShaper();
+
+    [NewObject, Throws]
+    PannerNode createPanner();
+
+    [NewObject, Throws]
+    StereoPannerNode createStereoPanner();
+
+    [NewObject, Throws]
+    ConvolverNode createConvolver();
+
+    [NewObject, Throws]
+    ChannelSplitterNode createChannelSplitter(optional unsigned long numberOfOutputs = 6);
+
+    [NewObject, Throws]
+    ChannelMergerNode createChannelMerger(optional unsigned long numberOfInputs = 6);
+
+    [NewObject, Throws]
+    DynamicsCompressorNode createDynamicsCompressor();
+
+    [NewObject, Throws]
+    OscillatorNode createOscillator();
+
+    [NewObject, Throws]
+    PeriodicWave createPeriodicWave(sequence<float> real,
+                                    sequence<float> imag,
+                                    optional PeriodicWaveConstraints constraints = {});
+};
diff --git a/dom/webidl/BaseKeyframeTypes.webidl b/dom/webidl/BaseKeyframeTypes.webidl
new file mode 100644
index 0000000000..a6e94b1e3a
--- /dev/null
+++ b/dom/webidl/BaseKeyframeTypes.webidl
@@ -0,0 +1,62 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#the-compositeoperation-enumeration
+ * https://drafts.csswg.org/web-animations/#dictdef-basepropertyindexedkeyframe
+ * https://drafts.csswg.org/web-animations/#dictdef-basekeyframe
+ * https://drafts.csswg.org/web-animations/#dictdef-basecomputedkeyframe
+ *
+ * Copyright © 2016 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum CompositeOperation { "replace", "add", "accumulate" };
+
+// NOTE: The order of the values in this enum are important.
+//
+// We assume that CompositeOperation is a subset of CompositeOperationOrAuto so
+// that we can cast between the two types (provided the value is not "auto").
+//
+// If that assumption ceases to hold we will need to update the conversion
+// in KeyframeUtils::GetAnimationPropertiesFromKeyframes.
+enum CompositeOperationOrAuto { "replace", "add", "accumulate", "auto" };
+
+// The following dictionary types are not referred to by other .webidl files,
+// but we use it for manual JS->IDL and IDL->JS conversions in KeyframeEffect's
+// implementation.
+
+[GenerateInit]
+dictionary BasePropertyIndexedKeyframe {
+  (double? or sequence<double?>) offset = [];
+  (UTF8String or sequence<UTF8String>) easing = [];
+  (CompositeOperationOrAuto or sequence<CompositeOperationOrAuto>) composite = [];
+};
+
+[GenerateInit]
+dictionary BaseKeyframe {
+  double? offset = null;
+  UTF8String easing = "linear";
+  [Pref="dom.animations-api.compositing.enabled"]
+  CompositeOperationOrAuto composite = "auto";
+
+  // Non-standard extensions
+
+  // Member to allow testing when StyleAnimationValue::ComputeValues fails.
+  //
+  // Note that we currently only apply this to shorthand properties since
+  // it's easier to annotate shorthand property values and because we have
+  // only ever observed ComputeValues failing on shorthand values.
+  //
+  // Bug 1216844 should remove this member since after that bug is fixed we will
+  // have a well-defined behavior to use when animation endpoints are not
+  // available.
+  [ChromeOnly] boolean simulateComputeValuesFailure = false;
+};
+
+[GenerateConversionToJS]
+dictionary BaseComputedKeyframe : BaseKeyframe {
+  double computedOffset;
+};
diff --git a/dom/webidl/BasicCardPayment.webidl b/dom/webidl/BasicCardPayment.webidl
new file mode 100644
index 0000000000..2531c5601c
--- /dev/null
+++ b/dom/webidl/BasicCardPayment.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://www.w3.org/TR/payment-method-basic-card/
+ */
+
+[GenerateInit]
+dictionary BasicCardRequest {
+  sequence<DOMString> supportedNetworks = [];
+  boolean requestSecurityCode = true;
+};
+
+[GenerateConversionToJS]
+dictionary BasicCardResponse {
+           DOMString cardholderName = "";
+  required DOMString cardNumber;
+           DOMString expiryMonth = "";
+           DOMString expiryYear = "";
+           DOMString cardSecurityCode = "";
+           PaymentAddress? billingAddress = null;
+};
+
+[GenerateConversionToJS]
+dictionary BasicCardChangeDetails {
+  PaymentAddress? billingAddress = null;
+};
+
+[GenerateInit]
+dictionary BasicCardErrors {
+  DOMString cardNumber;
+  DOMString cardholderName;
+  DOMString cardSecurityCode;
+  DOMString expiryMonth;
+  DOMString expiryYear;
+  AddressErrors billingAddress;
+};
diff --git a/dom/webidl/BatteryManager.webidl b/dom/webidl/BatteryManager.webidl
new file mode 100644
index 0000000000..2a09a514b8
--- /dev/null
+++ b/dom/webidl/BatteryManager.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/battery-status/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[ChromeOnly, Exposed=Window]
+interface BatteryManager : EventTarget {
+    readonly attribute boolean             charging;
+    readonly attribute unrestricted double chargingTime;
+    readonly attribute unrestricted double dischargingTime;
+    readonly attribute double              level;
+
+             attribute EventHandler        onchargingchange;
+             attribute EventHandler        onchargingtimechange;
+             attribute EventHandler        ondischargingtimechange;
+             attribute EventHandler        onlevelchange;
+};
diff --git a/dom/webidl/BeforeUnloadEvent.webidl b/dom/webidl/BeforeUnloadEvent.webidl
new file mode 100644
index 0000000000..e1caf63e40
--- /dev/null
+++ b/dom/webidl/BeforeUnloadEvent.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * http://www.whatwg.org/specs/web-apps/current-work/#beforeunloadevent
+ */
+
+[Exposed=Window]
+interface BeforeUnloadEvent : Event {
+  attribute DOMString returnValue;
+};
diff --git a/dom/webidl/BiquadFilterNode.webidl b/dom/webidl/BiquadFilterNode.webidl
new file mode 100644
index 0000000000..14f3b6c69d
--- /dev/null
+++ b/dom/webidl/BiquadFilterNode.webidl
@@ -0,0 +1,53 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum BiquadFilterType {
+  "lowpass",
+  "highpass",
+  "bandpass",
+  "lowshelf",
+  "highshelf",
+  "peaking",
+  "notch",
+  "allpass"
+};
+
+dictionary BiquadFilterOptions : AudioNodeOptions {
+             BiquadFilterType type = "lowpass";
+             float            Q = 1;
+             float            detune = 0;
+             float            frequency = 350;
+             float            gain = 0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface BiquadFilterNode : AudioNode {
+    [Throws]
+    constructor(BaseAudioContext context,
+                optional BiquadFilterOptions options = {});
+
+    attribute BiquadFilterType type;
+    readonly attribute AudioParam frequency; // in Hertz
+    readonly attribute AudioParam detune; // in Cents
+    readonly attribute AudioParam Q; // Quality factor
+    readonly attribute AudioParam gain; // in Decibels
+
+    [Throws]
+    undefined getFrequencyResponse(Float32Array frequencyHz,
+                                   Float32Array magResponse,
+                                   Float32Array phaseResponse);
+
+};
+
+// Mozilla extension
+BiquadFilterNode includes  AudioNodePassThrough;
diff --git a/dom/webidl/Blob.webidl b/dom/webidl/Blob.webidl
new file mode 100644
index 0000000000..832f90ad4b
--- /dev/null
+++ b/dom/webidl/Blob.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/FileAPI/#blob
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+typedef (BufferSource or Blob or UTF8String) BlobPart;
+
+[Exposed=(Window,Worker)]
+interface Blob {
+  [Throws]
+  constructor(optional sequence<BlobPart> blobParts,
+              optional BlobPropertyBag options = {});
+
+  [GetterThrows]
+  readonly attribute unsigned long long size;
+
+  readonly attribute DOMString type;
+
+  //slice Blob into byte-ranged chunks
+
+  [Throws]
+  Blob slice(optional [Clamp] long long start,
+             optional [Clamp] long long end,
+             optional DOMString contentType);
+
+  // read from the Blob.
+  [NewObject, Throws] ReadableStream stream();
+  [NewObject] Promise<USVString> text();
+  [NewObject] Promise<ArrayBuffer> arrayBuffer();
+};
+
+enum EndingType { "transparent", "native" };
+
+dictionary BlobPropertyBag {
+  DOMString type = "";
+  EndingType endings = "transparent";
+};
+
+partial interface Blob {
+  // This returns the type of BlobImpl used for this Blob.
+  [ChromeOnly]
+  readonly attribute DOMString blobImplType;
+};
diff --git a/dom/webidl/BlobEvent.webidl b/dom/webidl/BlobEvent.webidl
new file mode 100644
index 0000000000..8f13adc2ee
--- /dev/null
+++ b/dom/webidl/BlobEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * https://w3c.github.io/mediacapture-record/#blobevent-section
+ */
+
+[Exposed=Window]
+interface BlobEvent : Event
+{
+  constructor(DOMString type, BlobEventInit eventInitDict);
+  readonly attribute Blob data;
+};
+
+dictionary BlobEventInit : EventInit
+{
+  required Blob data;
+};
diff --git a/dom/webidl/BroadcastChannel.webidl b/dom/webidl/BroadcastChannel.webidl
new file mode 100644
index 0000000000..196ff2eff9
--- /dev/null
+++ b/dom/webidl/BroadcastChannel.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://html.spec.whatwg.org/#broadcastchannel
+ */
+
+[Exposed=(Window,Worker)]
+interface BroadcastChannel : EventTarget {
+  [Throws]
+  constructor(DOMString channel);
+
+  readonly attribute DOMString name;
+
+  [Throws]
+  undefined postMessage(any message);
+
+  undefined close();
+
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+};
diff --git a/dom/webidl/BrowserElementDictionaries.webidl b/dom/webidl/BrowserElementDictionaries.webidl
new file mode 100644
index 0000000000..7058aaeb5b
--- /dev/null
+++ b/dom/webidl/BrowserElementDictionaries.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[GenerateConversionToJS]
+dictionary OpenWindowEventDetail {
+  DOMString url = "";
+  DOMString name = "";
+  DOMString features = "";
+  Node? frameElement = null;
+  boolean forceNoReferrer = false;
+};
+
+[GenerateConversionToJS]
+dictionary DOMWindowResizeEventDetail {
+  long width = 0;
+  long height = 0;
+};
diff --git a/dom/webidl/CDATASection.webidl b/dom/webidl/CDATASection.webidl
new file mode 100644
index 0000000000..cc0e8e88b9
--- /dev/null
+++ b/dom/webidl/CDATASection.webidl
@@ -0,0 +1,9 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface CDATASection : Text {
+};
diff --git a/dom/webidl/CSPDictionaries.webidl b/dom/webidl/CSPDictionaries.webidl
new file mode 100644
index 0000000000..a84162c6e5
--- /dev/null
+++ b/dom/webidl/CSPDictionaries.webidl
@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+  * Dictionary used to display CSP info.
+  */
+
+dictionary CSP {
+  boolean report-only = false;
+
+  sequence<DOMString> default-src;
+  sequence<DOMString> script-src;
+  sequence<DOMString> object-src;
+  sequence<DOMString> style-src;
+  sequence<DOMString> img-src;
+  sequence<DOMString> media-src;
+  sequence<DOMString> frame-src;
+  sequence<DOMString> font-src;
+  sequence<DOMString> connect-src;
+  sequence<DOMString> report-uri;
+  sequence<DOMString> frame-ancestors;
+  // sequence<DOMString> reflected-xss; // not supported in Firefox
+  sequence<DOMString> base-uri;
+  sequence<DOMString> form-action;
+  sequence<DOMString> referrer;
+  sequence<DOMString> manifest-src;
+  sequence<DOMString> upgrade-insecure-requests;
+  sequence<DOMString> child-src;
+  sequence<DOMString> block-all-mixed-content;
+  sequence<DOMString> sandbox;
+  sequence<DOMString> worker-src;
+  sequence<DOMString> script-src-elem;
+  sequence<DOMString> script-src-attr;
+};
+
+[GenerateToJSON]
+dictionary CSPPolicies {
+  sequence<CSP> csp-policies;
+};
diff --git a/dom/webidl/CSPReport.webidl b/dom/webidl/CSPReport.webidl
new file mode 100644
index 0000000000..e8141ddfee
--- /dev/null
+++ b/dom/webidl/CSPReport.webidl
@@ -0,0 +1,33 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+  * This dictionary holds the parameters used to send
+  * CSP reports in JSON format.
+  *
+  * Based on https://w3c.github.io/webappsec-csp/#deprecated-serialize-violation
+  */
+
+dictionary CSPReportProperties {
+  DOMString document-uri = "";
+  DOMString referrer = "";
+  DOMString blocked-uri = "";
+  DOMString effective-directive = "";
+  DOMString violated-directive = "";
+  DOMString original-policy= "";
+  SecurityPolicyViolationEventDisposition disposition = "report";
+  long status-code = 0;
+
+  DOMString source-file;
+  DOMString script-sample;
+  long line-number;
+  long column-number;
+};
+
+[GenerateToJSON]
+dictionary CSPReport {
+  // We always want to have a "csp-report" property, so just pre-initialize it
+  // to an empty dictionary..
+  CSPReportProperties csp-report = {};
+};
diff --git a/dom/webidl/CSS.webidl b/dom/webidl/CSS.webidl
new file mode 100644
index 0000000000..0809b7318b
--- /dev/null
+++ b/dom/webidl/CSS.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css3-conditional/
+ * http://dev.w3.org/csswg/cssom/#the-css.escape%28%29-method
+ * https://www.w3.org/TR/css-highlight-api-1/#registration
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+namespace CSS {
+  boolean supports(UTF8String property, UTF8String value);
+  boolean supports(UTF8String conditionText);
+};
+
+// http://dev.w3.org/csswg/cssom/#the-css.escape%28%29-method
+partial namespace CSS {
+  DOMString escape(DOMString ident);
+};
+
+// https://www.w3.org/TR/css-highlight-api-1/#registration
+partial namespace CSS {
+  [Pref="dom.customHighlightAPI.enabled", GetterThrows]
+  readonly attribute HighlightRegistry highlights;
+};
diff --git a/dom/webidl/CSS2Properties.webidl.in b/dom/webidl/CSS2Properties.webidl.in
new file mode 100644
index 0000000000..0f7853946c
--- /dev/null
+++ b/dom/webidl/CSS2Properties.webidl.in
@@ -0,0 +1,4 @@
+[Exposed=Window]
+interface CSS2Properties : CSSStyleDeclaration {
+${props}
+};
diff --git a/dom/webidl/CSSAnimation.webidl b/dom/webidl/CSSAnimation.webidl
new file mode 100644
index 0000000000..f60b9ed0c8
--- /dev/null
+++ b/dom/webidl/CSSAnimation.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-animations-2/#the-CSSAnimation-interface
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="Document::IsWebAnimationsGetAnimationsEnabled",
+ HeaderFile="nsAnimationManager.h",
+ Exposed=Window]
+interface CSSAnimation : Animation {
+  [Constant] readonly attribute DOMString animationName;
+};
diff --git a/dom/webidl/CSSConditionRule.webidl b/dom/webidl/CSSConditionRule.webidl
new file mode 100644
index 0000000000..a799498494
--- /dev/null
+++ b/dom/webidl/CSSConditionRule.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-conditional/#the-cssconditionrule-interface
+ */
+
+// https://drafts.csswg.org/css-conditional/#the-cssconditionrule-interface
+[Exposed=Window]
+interface CSSConditionRule : CSSGroupingRule {
+  readonly attribute UTF8String conditionText;
+};
diff --git a/dom/webidl/CSSContainerRule.webidl b/dom/webidl/CSSContainerRule.webidl
new file mode 100644
index 0000000000..0a4c96fdba
--- /dev/null
+++ b/dom/webidl/CSSContainerRule.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-contain-3/#the-csscontainerrule-interface
+ */
+
+// https://drafts.csswg.org/css-contain-3/#the-csscontainerrule-interface
+[Exposed=Window, Pref="layout.css.container-queries.enabled"]
+interface CSSContainerRule : CSSConditionRule {
+  readonly attribute UTF8String containerName;
+  readonly attribute UTF8String containerQuery;
+
+  // Performs a container query look-up for an element.
+  [ChromeOnly] Element? queryContainerFor(Element element);
+};
diff --git a/dom/webidl/CSSCounterStyleRule.webidl b/dom/webidl/CSSCounterStyleRule.webidl
new file mode 100644
index 0000000000..a7678f0fd7
--- /dev/null
+++ b/dom/webidl/CSSCounterStyleRule.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-counter-styles-3/#the-csscounterstylerule-interface
+ */
+
+// https://drafts.csswg.org/css-counter-styles-3/#the-csscounterstylerule-interface
+[Exposed=Window]
+interface CSSCounterStyleRule : CSSRule {
+  attribute DOMString name;
+  attribute UTF8String system;
+  attribute UTF8String symbols;
+  attribute UTF8String additiveSymbols;
+  attribute UTF8String negative;
+  attribute UTF8String prefix;
+  attribute UTF8String suffix;
+  attribute UTF8String range;
+  attribute UTF8String pad;
+  attribute UTF8String speakAs;
+  attribute UTF8String fallback;
+};
diff --git a/dom/webidl/CSSFontFaceRule.webidl b/dom/webidl/CSSFontFaceRule.webidl
new file mode 100644
index 0000000000..fe5028d440
--- /dev/null
+++ b/dom/webidl/CSSFontFaceRule.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-fonts/#om-fontface
+ */
+
+// https://drafts.csswg.org/css-fonts/#om-fontface
+// But we implement a very old draft, apparently....
+// See bug 1058408 for implementing the current spec.
+[Exposed=Window]
+interface CSSFontFaceRule : CSSRule {
+  [SameObject] readonly attribute CSSStyleDeclaration style;
+};
diff --git a/dom/webidl/CSSFontFeatureValuesRule.webidl b/dom/webidl/CSSFontFeatureValuesRule.webidl
new file mode 100644
index 0000000000..0eb6364d43
--- /dev/null
+++ b/dom/webidl/CSSFontFeatureValuesRule.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-fonts/#om-fontfeaturevalues
+ */
+
+// https://drafts.csswg.org/css-fonts/#om-fontfeaturevalues
+// but we don't implement anything remotely resembling the spec.
+[Exposed=Window]
+interface CSSFontFeatureValuesRule : CSSRule {
+  [SetterThrows]
+  attribute UTF8String fontFamily;
+
+  // Not yet implemented
+  //  readonly attribute CSSFontFeatureValuesMap annotation;
+  //  readonly attribute CSSFontFeatureValuesMap ornaments;
+  //  readonly attribute CSSFontFeatureValuesMap stylistic;
+  //  readonly attribute CSSFontFeatureValuesMap swash;
+  //  readonly attribute CSSFontFeatureValuesMap characterVariant;
+  //  readonly attribute CSSFontFeatureValuesMap styleset;
+};
+
+partial interface CSSFontFeatureValuesRule {
+  // Gecko addition?
+  [SetterThrows]
+  attribute UTF8String valueText;
+};
diff --git a/dom/webidl/CSSFontPaletteValuesRule.webidl b/dom/webidl/CSSFontPaletteValuesRule.webidl
new file mode 100644
index 0000000000..4ec58c8a15
--- /dev/null
+++ b/dom/webidl/CSSFontPaletteValuesRule.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-fonts/#om-fontpalettevalues
+ */
+
+[Exposed=Window, Pref="layout.css.font-palette.enabled"]
+interface CSSFontPaletteValuesRule : CSSRule {
+  readonly attribute UTF8String name;
+  readonly attribute UTF8String fontFamily;
+  readonly attribute UTF8String basePalette;
+  readonly attribute UTF8String overrideColors;
+};
diff --git a/dom/webidl/CSSGroupingRule.webidl b/dom/webidl/CSSGroupingRule.webidl
new file mode 100644
index 0000000000..32c33814e0
--- /dev/null
+++ b/dom/webidl/CSSGroupingRule.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#cssgroupingrule
+ */
+
+// https://drafts.csswg.org/cssom/#cssgroupingrule
+[Exposed=Window]
+interface CSSGroupingRule : CSSRule {
+  [SameObject] readonly attribute CSSRuleList? cssRules;
+  [Throws]
+  unsigned long insertRule(UTF8String rule, optional unsigned long index = 0);
+  [Throws]
+  undefined deleteRule(unsigned long index);
+};
diff --git a/dom/webidl/CSSImportRule.webidl b/dom/webidl/CSSImportRule.webidl
new file mode 100644
index 0000000000..965da60d1c
--- /dev/null
+++ b/dom/webidl/CSSImportRule.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#cssimportrule
+ */
+
+// https://drafts.csswg.org/cssom/#cssimportrule
+[Exposed=Window]
+interface CSSImportRule : CSSRule {
+  readonly attribute DOMString href;
+  // Per spec, the .media is never null, but in our implementation it can
+  // be since stylesheet can be null, and in Stylo, media is derived from
+  // the stylesheet.  See <https://bugzilla.mozilla.org/show_bug.cgi?id=1326509>.
+  [SameObject, PutForwards=mediaText] readonly attribute MediaList? media;
+  [SameObject, BinaryName="styleSheetForBindings"] readonly attribute CSSStyleSheet? styleSheet;
+  readonly attribute UTF8String? layerName;
+  readonly attribute UTF8String? supportsText;
+};
diff --git a/dom/webidl/CSSKeyframeRule.webidl b/dom/webidl/CSSKeyframeRule.webidl
new file mode 100644
index 0000000000..6647b3fb2c
--- /dev/null
+++ b/dom/webidl/CSSKeyframeRule.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-animations/#interface-csskeyframerule
+ */
+
+// https://drafts.csswg.org/css-animations/#interface-csskeyframerule
+[Exposed=Window]
+interface CSSKeyframeRule : CSSRule {
+  attribute UTF8String keyText;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
diff --git a/dom/webidl/CSSKeyframesRule.webidl b/dom/webidl/CSSKeyframesRule.webidl
new file mode 100644
index 0000000000..701ef67b06
--- /dev/null
+++ b/dom/webidl/CSSKeyframesRule.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-animations/#interface-csskeyframesrule
+ */
+
+// https://drafts.csswg.org/css-animations/#interface-csskeyframesrule
+[Exposed=Window]
+interface CSSKeyframesRule : CSSRule {
+           attribute DOMString   name;
+  readonly attribute CSSRuleList cssRules;
+
+  getter CSSKeyframeRule (unsigned long index);
+  readonly attribute unsigned long length;
+
+  undefined        appendRule(DOMString rule);
+  undefined        deleteRule(DOMString select);
+  CSSKeyframeRule? findRule(DOMString select);
+};
diff --git a/dom/webidl/CSSLayerBlockRule.webidl b/dom/webidl/CSSLayerBlockRule.webidl
new file mode 100644
index 0000000000..89b2828a6b
--- /dev/null
+++ b/dom/webidl/CSSLayerBlockRule.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-cascade-5/#the-csslayerblockrule-interface
+ */
+[Exposed=Window]
+interface CSSLayerBlockRule : CSSGroupingRule {
+  readonly attribute UTF8String name;
+};
diff --git a/dom/webidl/CSSLayerStatementRule.webidl b/dom/webidl/CSSLayerStatementRule.webidl
new file mode 100644
index 0000000000..13871e29d3
--- /dev/null
+++ b/dom/webidl/CSSLayerStatementRule.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-cascade-5/#the-csslayerstatementrule-interface
+ */
+[Exposed=Window]
+interface CSSLayerStatementRule : CSSRule {
+  // readonly attribute FrozenArray<CSSOMString> nameList;
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<UTF8String> nameList;
+};
diff --git a/dom/webidl/CSSMediaRule.webidl b/dom/webidl/CSSMediaRule.webidl
new file mode 100644
index 0000000000..10d7573d8a
--- /dev/null
+++ b/dom/webidl/CSSMediaRule.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#the-cssmediarule-interface
+ * https://drafts.csswg.org/css-conditional/#the-cssmediarule-interface
+ */
+
+// https://drafts.csswg.org/cssom/#the-cssmediarule-interface and
+// https://drafts.csswg.org/css-conditional/#the-cssmediarule-interface
+// except they disagree with each other.  We're taking the inheritance from
+// css-conditional and the PutForwards behavior from cssom.
+[Exposed=Window]
+interface CSSMediaRule : CSSConditionRule {
+  [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
+};
diff --git a/dom/webidl/CSSMozDocumentRule.webidl b/dom/webidl/CSSMozDocumentRule.webidl
new file mode 100644
index 0000000000..47bd3933fd
--- /dev/null
+++ b/dom/webidl/CSSMozDocumentRule.webidl
@@ -0,0 +1,11 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// This is a non-standard interface for @-moz-document rules
+[Exposed=Window]
+interface CSSMozDocumentRule : CSSConditionRule {
+  // XXX Add access to the URL list.
+};
diff --git a/dom/webidl/CSSNamespaceRule.webidl b/dom/webidl/CSSNamespaceRule.webidl
new file mode 100644
index 0000000000..6044c3a6f2
--- /dev/null
+++ b/dom/webidl/CSSNamespaceRule.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#cssnamespacerule
+ */
+
+// https://drafts.csswg.org/cssom/#cssnamespacerule
+[Exposed=Window]
+interface CSSNamespaceRule : CSSRule {
+  readonly attribute DOMString namespaceURI;
+  readonly attribute DOMString prefix;
+};
diff --git a/dom/webidl/CSSPageRule.webidl b/dom/webidl/CSSPageRule.webidl
new file mode 100644
index 0000000000..afc999a7ee
--- /dev/null
+++ b/dom/webidl/CSSPageRule.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#the-csspagerule-interface
+ */
+
+// https://drafts.csswg.org/cssom/#the-csspagerule-interface
+// Per spec, this should inherit from CSSGroupingRule, but we don't
+// implement this yet.
+[Exposed=Window]
+interface CSSPageRule : CSSRule {
+  attribute UTF8String selectorText;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
diff --git a/dom/webidl/CSSPropertyRule.webidl b/dom/webidl/CSSPropertyRule.webidl
new file mode 100644
index 0000000000..20b03a738b
--- /dev/null
+++ b/dom/webidl/CSSPropertyRule.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.css-houdini.org/css-properties-values-api-1/#the-css-property-rule-interface
+ */
+
+// https://drafts.css-houdini.org/css-properties-values-api-1/#the-css-property-rule-interface
+[Exposed=Window, Pref="layout.css.properties-and-values.enabled"]
+interface CSSPropertyRule : CSSRule {
+  readonly attribute UTF8String name;
+  readonly attribute UTF8String syntax;
+  readonly attribute boolean inherits;
+  readonly attribute UTF8String? initialValue;
+};
diff --git a/dom/webidl/CSSPseudoElement.webidl b/dom/webidl/CSSPseudoElement.webidl
new file mode 100644
index 0000000000..c0e49a8d6e
--- /dev/null
+++ b/dom/webidl/CSSPseudoElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-pseudo-4/#csspseudoelement
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.css_pseudo_element.enabled",
+ Exposed=Window]
+interface CSSPseudoElement {
+  readonly attribute DOMString type;
+  readonly attribute Element element;
+};
diff --git a/dom/webidl/CSSRule.webidl b/dom/webidl/CSSRule.webidl
new file mode 100644
index 0000000000..10b4585eb0
--- /dev/null
+++ b/dom/webidl/CSSRule.webidl
@@ -0,0 +1,59 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#the-cssrule-interface
+ * https://drafts.csswg.org/css-animations/#interface-cssrule
+ * https://drafts.csswg.org/css-counter-styles-3/#extentions-to-cssrule-interface
+ * https://drafts.csswg.org/css-conditional-3/#extentions-to-cssrule-interface
+ * https://drafts.csswg.org/css-fonts-3/#om-fontfeaturevalues
+ */
+
+// https://drafts.csswg.org/cssom/#the-cssrule-interface
+[Exposed=Window]
+interface CSSRule {
+
+  const unsigned short STYLE_RULE = 1;
+  const unsigned short CHARSET_RULE = 2; // historical
+  const unsigned short IMPORT_RULE = 3;
+  const unsigned short MEDIA_RULE = 4;
+  const unsigned short FONT_FACE_RULE = 5;
+  const unsigned short PAGE_RULE = 6;
+  // FIXME: We don't support MARGIN_RULE yet.
+  // XXXbz Should we expose the constant anyway?
+  // const unsigned short MARGIN_RULE = 9;
+  const unsigned short NAMESPACE_RULE = 10;
+  [BinaryName="typeForBindings"] readonly attribute unsigned short type;
+  attribute UTF8String cssText;
+  readonly attribute CSSRule? parentRule;
+  readonly attribute CSSStyleSheet? parentStyleSheet;
+};
+
+// https://drafts.csswg.org/css-animations/#interface-cssrule
+partial interface CSSRule {
+    const unsigned short KEYFRAMES_RULE = 7;
+    const unsigned short KEYFRAME_RULE = 8;
+};
+
+// https://drafts.csswg.org/css-counter-styles-3/#extentions-to-cssrule-interface
+partial interface CSSRule {
+    const unsigned short COUNTER_STYLE_RULE = 11;
+};
+
+// https://drafts.csswg.org/css-conditional-3/#extentions-to-cssrule-interface
+partial interface CSSRule {
+    const unsigned short SUPPORTS_RULE = 12;
+};
+
+// Non-standard extension for @-moz-document rules.
+partial interface CSSRule {
+    [ChromeOnly]
+    const unsigned short DOCUMENT_RULE = 13;
+};
+
+// https://drafts.csswg.org/css-fonts-3/#om-fontfeaturevalues
+partial interface CSSRule {
+  const unsigned short FONT_FEATURE_VALUES_RULE = 14;
+};
diff --git a/dom/webidl/CSSRuleList.webidl b/dom/webidl/CSSRuleList.webidl
new file mode 100644
index 0000000000..bd263d419e
--- /dev/null
+++ b/dom/webidl/CSSRuleList.webidl
@@ -0,0 +1,11 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface CSSRuleList {
+  readonly attribute unsigned long length;
+  getter CSSRule? item(unsigned long index);
+};
diff --git a/dom/webidl/CSSStyleDeclaration.webidl b/dom/webidl/CSSStyleDeclaration.webidl
new file mode 100644
index 0000000000..99469a6709
--- /dev/null
+++ b/dom/webidl/CSSStyleDeclaration.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom/
+ */
+
+ // Because of getComputedStyle, many CSSStyleDeclaration objects can be
+ // short-living.
+[ProbablyShortLivingWrapper,
+ Exposed=Window]
+interface CSSStyleDeclaration {
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+  attribute UTF8String cssText;
+
+  readonly attribute unsigned long length;
+  getter UTF8String item(unsigned long index);
+
+  [Throws, ChromeOnly]
+  sequence<UTF8String> getCSSImageURLs(UTF8String property);
+
+  [Throws]
+  UTF8String getPropertyValue(UTF8String property);
+  UTF8String getPropertyPriority(UTF8String property);
+  [CEReactions, NeedsSubjectPrincipal=NonSystem, Throws]
+  undefined setProperty(UTF8String property, [LegacyNullToEmptyString] UTF8String value, optional [LegacyNullToEmptyString] UTF8String priority = "");
+  [CEReactions, Throws]
+  UTF8String removeProperty(UTF8String property);
+
+  readonly attribute CSSRule? parentRule;
+};
diff --git a/dom/webidl/CSSStyleRule.webidl b/dom/webidl/CSSStyleRule.webidl
new file mode 100644
index 0000000000..739bd958bb
--- /dev/null
+++ b/dom/webidl/CSSStyleRule.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom/#the-cssstylerule-interface
+ */
+
+// https://drafts.csswg.org/cssom/#the-cssstylerule-interface
+[Exposed=Window]
+interface CSSStyleRule : CSSRule {
+  attribute UTF8String selectorText;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
diff --git a/dom/webidl/CSSStyleSheet.webidl b/dom/webidl/CSSStyleSheet.webidl
new file mode 100644
index 0000000000..db6d9feb70
--- /dev/null
+++ b/dom/webidl/CSSStyleSheet.webidl
@@ -0,0 +1,49 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom/
+ * https://wicg.github.io/construct-stylesheets/
+ */
+
+enum CSSStyleSheetParsingMode {
+  "author",
+  "user",
+  "agent"
+};
+
+dictionary CSSStyleSheetInit {
+  (MediaList or UTF8String) media = "";
+  boolean disabled = false;
+  UTF8String baseURL;
+};
+
+[Exposed=Window]
+interface CSSStyleSheet : StyleSheet {
+  [Throws, Pref="layout.css.constructable-stylesheets.enabled"]
+  constructor(optional CSSStyleSheetInit options = {});
+  [Pure, BinaryName="DOMOwnerRule"]
+  readonly attribute CSSRule? ownerRule;
+  [Throws, NeedsSubjectPrincipal]
+  readonly attribute CSSRuleList cssRules;
+  [ChromeOnly, BinaryName="parsingModeDOM"]
+  readonly attribute CSSStyleSheetParsingMode parsingMode;
+  [Throws, NeedsSubjectPrincipal]
+  unsigned long insertRule(UTF8String rule, optional unsigned long index = 0);
+  [Throws, NeedsSubjectPrincipal]
+  undefined deleteRule(unsigned long index);
+  [NewObject, Pref="layout.css.constructable-stylesheets.enabled"]
+  Promise<CSSStyleSheet> replace(UTF8String text);
+  [Throws, Pref="layout.css.constructable-stylesheets.enabled"]
+  undefined replaceSync(UTF8String text);
+
+  // Non-standard WebKit things.
+  [Throws, NeedsSubjectPrincipal, BinaryName="cssRules"]
+  readonly attribute CSSRuleList rules;
+  [Throws, NeedsSubjectPrincipal, BinaryName="deleteRule"]
+  undefined removeRule(optional unsigned long index = 0);
+  [Throws, NeedsSubjectPrincipal]
+  long addRule(optional UTF8String selector = "undefined", optional UTF8String style = "undefined", optional unsigned long index);
+};
diff --git a/dom/webidl/CSSSupportsRule.webidl b/dom/webidl/CSSSupportsRule.webidl
new file mode 100644
index 0000000000..3040f34507
--- /dev/null
+++ b/dom/webidl/CSSSupportsRule.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-conditional/#the-csssupportsrule-interface
+ */
+
+// https://drafts.csswg.org/css-conditional/#the-csssupportsrule-interface
+[Exposed=Window]
+interface CSSSupportsRule : CSSConditionRule {
+};
diff --git a/dom/webidl/CSSTransition.webidl b/dom/webidl/CSSTransition.webidl
new file mode 100644
index 0000000000..5c2f74173e
--- /dev/null
+++ b/dom/webidl/CSSTransition.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-transitions-2/#the-CSSTransition-interface
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="Document::IsWebAnimationsGetAnimationsEnabled",
+ HeaderFile="nsTransitionManager.h",
+ Exposed=Window]
+interface CSSTransition : Animation {
+  [Constant] readonly attribute DOMString transitionProperty;
+};
diff --git a/dom/webidl/Cache.webidl b/dom/webidl/Cache.webidl
new file mode 100644
index 0000000000..b7f676e3fe
--- /dev/null
+++ b/dom/webidl/Cache.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/ServiceWorker/#cache-interface
+ */
+
+[Exposed=(Window,Worker),
+ Func="nsGlobalWindowInner::CachesEnabled"]
+interface Cache {
+  [NewObject]
+  Promise<Response> match(RequestInfo request, optional CacheQueryOptions options = {});
+  [NewObject]
+  Promise<sequence<Response>> matchAll(optional RequestInfo request, optional CacheQueryOptions options = {});
+  [NewObject, NeedsCallerType]
+  Promise<undefined> add(RequestInfo request);
+  [NewObject, NeedsCallerType]
+  Promise<undefined> addAll(sequence<RequestInfo> requests);
+  [NewObject]
+  Promise<undefined> put(RequestInfo request, Response response);
+  [NewObject]
+  Promise<boolean> delete(RequestInfo request, optional CacheQueryOptions options = {});
+  [NewObject]
+  Promise<sequence<Request>> keys(optional RequestInfo request, optional CacheQueryOptions options = {});
+};
+
+dictionary CacheQueryOptions {
+  boolean ignoreSearch = false;
+  boolean ignoreMethod = false;
+  boolean ignoreVary = false;
+};
+
+dictionary CacheBatchOperation {
+  DOMString type;
+  Request request;
+  Response response;
+  CacheQueryOptions options;
+};
diff --git a/dom/webidl/CacheStorage.webidl b/dom/webidl/CacheStorage.webidl
new file mode 100644
index 0000000000..7ece3197c6
--- /dev/null
+++ b/dom/webidl/CacheStorage.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/ServiceWorker/#cachestorage-interface
+ */
+
+interface Principal;
+
+[Exposed=(Window,Worker),
+ Func="nsGlobalWindowInner::CachesEnabled"]
+interface CacheStorage {
+  [Throws, ChromeOnly]
+  constructor(CacheStorageNamespace namespace, Principal principal);
+
+  [NewObject]
+  Promise<Response> match(RequestInfo request, optional MultiCacheQueryOptions options = {});
+  [NewObject]
+  Promise<boolean> has(DOMString cacheName);
+  [NewObject]
+  Promise<Cache> open(DOMString cacheName);
+  [NewObject]
+  Promise<boolean> delete(DOMString cacheName);
+  [NewObject]
+  Promise<sequence<DOMString>> keys();
+};
+
+dictionary MultiCacheQueryOptions : CacheQueryOptions {
+  DOMString cacheName;
+};
+
+// chrome-only, gecko specific extension
+enum CacheStorageNamespace {
+  "content", "chrome"
+};
diff --git a/dom/webidl/CancelContentJSOptions.webidl b/dom/webidl/CancelContentJSOptions.webidl
new file mode 100644
index 0000000000..6b07534adc
--- /dev/null
+++ b/dom/webidl/CancelContentJSOptions.webidl
@@ -0,0 +1,10 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[GenerateInit]
+dictionary CancelContentJSOptions {
+  long index = 0;
+  URI? uri = null;
+  long epoch = 0;
+};
diff --git a/dom/webidl/CanvasCaptureMediaStream.webidl b/dom/webidl/CanvasCaptureMediaStream.webidl
new file mode 100644
index 0000000000..fb90c9d217
--- /dev/null
+++ b/dom/webidl/CanvasCaptureMediaStream.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/mediacapture-fromelement/index.html
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Pref="canvas.capturestream.enabled",
+ Exposed=Window]
+interface CanvasCaptureMediaStream : MediaStream {
+    readonly attribute HTMLCanvasElement canvas;
+    undefined requestFrame();
+};
diff --git a/dom/webidl/CanvasRenderingContext2D.webidl b/dom/webidl/CanvasRenderingContext2D.webidl
new file mode 100644
index 0000000000..a427098e70
--- /dev/null
+++ b/dom/webidl/CanvasRenderingContext2D.webidl
@@ -0,0 +1,399 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+enum CanvasWindingRule { "nonzero", "evenodd" };
+
+[GenerateInit]
+dictionary ContextAttributes2D {
+  // whether or not we're planning to do a lot of readback operations
+  boolean willReadFrequently = false;
+  // signal if the canvas contains an alpha channel
+  boolean alpha = true;
+};
+
+dictionary HitRegionOptions {
+  Path2D? path = null;
+  DOMString id = "";
+  Element? control = null;
+};
+
+typedef (HTMLImageElement or
+         SVGImageElement) HTMLOrSVGImageElement;
+
+typedef (HTMLOrSVGImageElement or
+         HTMLCanvasElement or
+         HTMLVideoElement or
+         OffscreenCanvas or
+         ImageBitmap) CanvasImageSource;
+
+[Exposed=Window]
+interface CanvasRenderingContext2D {
+
+  // back-reference to the canvas.  Might be null if we're not
+  // associated with a canvas.
+  readonly attribute HTMLCanvasElement? canvas;
+
+  // Show the caret if appropriate when drawing
+  [Func="CanvasUtils::HasDrawWindowPrivilege"]
+  const unsigned long DRAWWINDOW_DRAW_CARET   = 0x01;
+  // Don't flush pending layout notifications that could otherwise
+  // be batched up
+  [Func="CanvasUtils::HasDrawWindowPrivilege"]
+  const unsigned long DRAWWINDOW_DO_NOT_FLUSH = 0x02;
+  // Draw scrollbars and scroll the viewport if they are present
+  [Func="CanvasUtils::HasDrawWindowPrivilege"]
+  const unsigned long DRAWWINDOW_DRAW_VIEW    = 0x04;
+  // Use the widget layer manager if available. This means hardware
+  // acceleration may be used, but it might actually be slower or
+  // lower quality than normal. It will however more accurately reflect
+  // the pixels rendered to the screen.
+  [Func="CanvasUtils::HasDrawWindowPrivilege"]
+  const unsigned long DRAWWINDOW_USE_WIDGET_LAYERS = 0x08;
+  // Don't synchronously decode images - draw what we have
+  [Func="CanvasUtils::HasDrawWindowPrivilege"]
+  const unsigned long DRAWWINDOW_ASYNC_DECODE_IMAGES = 0x10;
+
+  /**
+   * Renders a region of a window into the canvas.  The contents of
+   * the window's viewport are rendered, ignoring viewport clipping
+   * and scrolling.
+   *
+   * @param x
+   * @param y
+   * @param w
+   * @param h specify the area of the window to render, in CSS
+   * pixels.
+   *
+   * @param backgroundColor the canvas is filled with this color
+   * before we render the window into it. This color may be
+   * transparent/translucent. It is given as a CSS color string
+   * (e.g., rgb() or rgba()).
+   *
+   * @param flags Used to better control the drawWindow call.
+   * Flags can be ORed together.
+   *
+   * Of course, the rendering obeys the current scale, transform and
+   * globalAlpha values.
+   *
+   * Hints:
+   * -- If 'rgba(0,0,0,0)' is used for the background color, the
+   * drawing will be transparent wherever the window is transparent.
+   * -- Top-level browsed documents are usually not transparent
+   * because the user's background-color preference is applied,
+   * but IFRAMEs are transparent if the page doesn't set a background.
+   * -- If an opaque color is used for the background color, rendering
+   * will be faster because we won't have to compute the window's
+   * transparency.
+   *
+   * This API cannot currently be used by Web content. It is chrome
+   * and Web Extensions (with a permission) only.
+   */
+  [Throws, NeedsSubjectPrincipal, Func="CanvasUtils::HasDrawWindowPrivilege"]
+  undefined drawWindow(Window window, double x, double y, double w, double h,
+                       UTF8String bgColor, optional unsigned long flags = 0);
+
+  /**
+   * This causes a context that is currently using a hardware-accelerated
+   * backend to fallback to a software one. All state should be preserved.
+   */
+  [ChromeOnly]
+  undefined demote();
+};
+
+CanvasRenderingContext2D includes CanvasState;
+CanvasRenderingContext2D includes CanvasTransform;
+CanvasRenderingContext2D includes CanvasCompositing;
+CanvasRenderingContext2D includes CanvasImageSmoothing;
+CanvasRenderingContext2D includes CanvasFillStrokeStyles;
+CanvasRenderingContext2D includes CanvasShadowStyles;
+CanvasRenderingContext2D includes CanvasFilters;
+CanvasRenderingContext2D includes CanvasRect;
+CanvasRenderingContext2D includes CanvasDrawPath;
+CanvasRenderingContext2D includes CanvasUserInterface;
+CanvasRenderingContext2D includes CanvasText;
+CanvasRenderingContext2D includes CanvasDrawImage;
+CanvasRenderingContext2D includes CanvasImageData;
+CanvasRenderingContext2D includes CanvasPathDrawingStyles;
+CanvasRenderingContext2D includes CanvasTextDrawingStyles;
+CanvasRenderingContext2D includes CanvasPathMethods;
+
+
+interface mixin CanvasState {
+  // state
+  undefined save(); // push state on state stack
+  undefined restore(); // pop state stack and restore state
+  undefined reset(); // reset the rendering context to its default state
+};
+
+interface mixin CanvasTransform {
+  // transformations (default transform is the identity matrix)
+  [Throws, LenientFloat]
+  undefined scale(double x, double y);
+  [Throws, LenientFloat]
+  undefined rotate(double angle);
+  [Throws, LenientFloat]
+  undefined translate(double x, double y);
+  [Throws, LenientFloat]
+  undefined transform(double a, double b, double c, double d, double e, double f);
+
+  [NewObject, Throws] DOMMatrix getTransform();
+  [Throws, LenientFloat]
+  undefined setTransform(double a, double b, double c, double d, double e, double f);
+  [Throws]
+  undefined setTransform(optional DOMMatrix2DInit transform = {});
+  [Throws]
+  undefined resetTransform();
+};
+
+interface mixin CanvasCompositing {
+  attribute unrestricted double globalAlpha; // (default 1.0)
+  [Throws]
+  attribute DOMString globalCompositeOperation; // (default source-over)
+};
+
+interface mixin CanvasImageSmoothing {
+  // drawing images
+  attribute boolean imageSmoothingEnabled;
+};
+
+interface mixin CanvasFillStrokeStyles {
+  // colors and styles (see also the CanvasPathDrawingStyles interface)
+  attribute (UTF8String or CanvasGradient or CanvasPattern) strokeStyle; // (default black)
+  attribute (UTF8String or CanvasGradient or CanvasPattern) fillStyle; // (default black)
+  [NewObject]
+  CanvasGradient createLinearGradient(double x0, double y0, double x1, double y1);
+  [NewObject, Throws]
+  CanvasGradient createRadialGradient(double x0, double y0, double r0, double x1, double y1, double r1);
+  [Pref="canvas.createConicGradient.enabled", NewObject]
+  CanvasGradient createConicGradient(double angle, double cx, double cy);
+  [NewObject, Throws]
+  CanvasPattern? createPattern(CanvasImageSource image, [LegacyNullToEmptyString] DOMString repetition);
+};
+
+interface mixin CanvasShadowStyles {
+  [LenientFloat]
+  attribute double shadowOffsetX; // (default 0)
+  [LenientFloat]
+  attribute double shadowOffsetY; // (default 0)
+  [LenientFloat]
+  attribute double shadowBlur; // (default 0)
+  attribute UTF8String shadowColor; // (default transparent black)
+};
+
+interface mixin CanvasFilters {
+  [Pref="canvas.filters.enabled", SetterThrows]
+  attribute UTF8String filter; // (default empty string = no filter)
+};
+
+interface mixin CanvasRect {
+  [LenientFloat]
+  undefined clearRect(double x, double y, double w, double h);
+  [LenientFloat]
+  undefined fillRect(double x, double y, double w, double h);
+  [LenientFloat]
+  undefined strokeRect(double x, double y, double w, double h);
+};
+
+interface mixin CanvasDrawPath {
+  // path API (see also CanvasPathMethods)
+  undefined beginPath();
+  undefined fill(optional CanvasWindingRule winding = "nonzero");
+  undefined fill(Path2D path, optional CanvasWindingRule winding = "nonzero");
+  undefined stroke();
+  undefined stroke(Path2D path);
+  undefined clip(optional CanvasWindingRule winding = "nonzero");
+  undefined clip(Path2D path, optional CanvasWindingRule winding = "nonzero");
+// NOT IMPLEMENTED  undefined resetClip();
+  [NeedsSubjectPrincipal]
+  boolean isPointInPath(unrestricted double x, unrestricted double y, optional CanvasWindingRule winding = "nonzero");
+  [NeedsSubjectPrincipal] // Only required because overloads can't have different extended attributes.
+  boolean isPointInPath(Path2D path, unrestricted double x, unrestricted double y, optional CanvasWindingRule winding = "nonzero");
+  [NeedsSubjectPrincipal]
+  boolean isPointInStroke(double x, double y);
+  [NeedsSubjectPrincipal] // Only required because overloads can't have different extended attributes.
+  boolean isPointInStroke(Path2D path, unrestricted double x, unrestricted double y);
+};
+
+interface mixin CanvasUserInterface {
+  [Pref="canvas.focusring.enabled", Throws] undefined drawFocusIfNeeded(Element element);
+// NOT IMPLEMENTED  undefined scrollPathIntoView();
+// NOT IMPLEMENTED  undefined scrollPathIntoView(Path path);
+};
+
+interface mixin CanvasText {
+  // text (see also the CanvasPathDrawingStyles interface)
+  [Throws, LenientFloat]
+  undefined fillText(DOMString text, double x, double y, optional double maxWidth);
+  [Throws, LenientFloat]
+  undefined strokeText(DOMString text, double x, double y, optional double maxWidth);
+  [NewObject, Throws]
+  TextMetrics measureText(DOMString text);
+};
+
+interface mixin CanvasDrawImage {
+  [Throws, LenientFloat]
+  undefined drawImage(CanvasImageSource image, double dx, double dy);
+  [Throws, LenientFloat]
+  undefined drawImage(CanvasImageSource image, double dx, double dy, double dw, double dh);
+  [Throws, LenientFloat]
+  undefined drawImage(CanvasImageSource image, double sx, double sy, double sw, double sh, double dx, double dy, double dw, double dh);
+};
+
+// See https://github.com/whatwg/html/issues/6262 for [EnforceRange] usage.
+interface mixin CanvasImageData {
+  // pixel manipulation
+  [NewObject, Throws]
+  ImageData createImageData([EnforceRange] long sw, [EnforceRange] long sh);
+  [NewObject, Throws]
+  ImageData createImageData(ImageData imagedata);
+  [NewObject, Throws, NeedsSubjectPrincipal]
+  ImageData getImageData([EnforceRange] long sx, [EnforceRange] long sy, [EnforceRange] long sw, [EnforceRange] long sh);
+  [Throws]
+  undefined putImageData(ImageData imagedata, [EnforceRange] long dx, [EnforceRange] long dy);
+  [Throws]
+  undefined putImageData(ImageData imagedata, [EnforceRange] long dx, [EnforceRange] long dy, [EnforceRange] long dirtyX, [EnforceRange] long dirtyY, [EnforceRange] long dirtyWidth, [EnforceRange] long dirtyHeight);
+};
+
+interface mixin CanvasPathDrawingStyles {
+  // line caps/joins
+  [LenientFloat]
+  attribute double lineWidth; // (default 1)
+  attribute DOMString lineCap; // "butt", "round", "square" (default "butt")
+  [GetterThrows]
+  attribute DOMString lineJoin; // "round", "bevel", "miter" (default "miter")
+  [LenientFloat]
+  attribute double miterLimit; // (default 10)
+
+  // dashed lines
+  [LenientFloat, Throws] undefined setLineDash(sequence<double> segments); // default empty
+  sequence<double> getLineDash();
+  [LenientFloat] attribute double lineDashOffset;
+};
+
+interface mixin CanvasTextDrawingStyles {
+  // text
+  [SetterThrows]
+  attribute UTF8String font; // (default 10px sans-serif)
+  attribute DOMString textAlign; // "start", "end", "left", "right", "center" (default: "start")
+  attribute DOMString textBaseline; // "top", "hanging", "middle", "alphabetic", "ideographic", "bottom" (default: "alphabetic")
+  attribute DOMString direction; // "ltr", "rtl", "inherit" (default: "inherit")
+  attribute UTF8String letterSpacing; // default: "0px"
+  attribute DOMString fontKerning; // "auto", "normal", "none" (default: "auto")
+// NOT IMPLEMENTED  attribute CanvasFontStretch fontStretch; // (default: "normal")
+// NOT IMPLEMENTED  attribute CanvasFontVariantCaps fontVariantCaps; // (default: "normal")
+// NOT IMPLEMENTED  attribute CanvasTextRendering textRendering; // (default: "auto")
+  attribute UTF8String wordSpacing; // default: "0px"
+};
+
+interface mixin CanvasPathMethods {
+  // shared path API methods
+  undefined closePath();
+  [LenientFloat]
+  undefined moveTo(double x, double y);
+  [LenientFloat]
+  undefined lineTo(double x, double y);
+  [LenientFloat]
+  undefined quadraticCurveTo(double cpx, double cpy, double x, double y);
+
+  [LenientFloat]
+  undefined bezierCurveTo(double cp1x, double cp1y, double cp2x, double cp2y, double x, double y);
+
+  [Throws, LenientFloat]
+  undefined arcTo(double x1, double y1, double x2, double y2, double radius);
+// NOT IMPLEMENTED  [LenientFloat] undefined arcTo(double x1, double y1, double x2, double y2, double radiusX, double radiusY, double rotation);
+
+  [LenientFloat]
+  undefined rect(double x, double y, double w, double h);
+
+  [Throws]
+  undefined roundRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h, optional (unrestricted double or DOMPointInit or sequence<(unrestricted double or DOMPointInit)>) radii = 0);
+
+  [Throws, LenientFloat]
+  undefined arc(double x, double y, double radius, double startAngle, double endAngle, optional boolean anticlockwise = false);
+
+  [Throws, LenientFloat]
+  undefined ellipse(double x, double y, double radiusX, double radiusY, double rotation, double startAngle, double endAngle, optional boolean anticlockwise = false);
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface CanvasGradient {
+  // opaque object
+  [Throws]
+  // addColorStop should take a double
+  undefined addColorStop(float offset, UTF8String color);
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface CanvasPattern {
+  // opaque object
+  // [Throws, LenientFloat] - could not do this overload because of bug 1020975
+  // undefined setTransform(double a, double b, double c, double d, double e, double f);
+
+  [Throws]
+  undefined setTransform(optional DOMMatrix2DInit matrix = {});
+};
+
+[Exposed=(Window,Worker)]
+interface TextMetrics {
+
+  // x-direction
+  readonly attribute double width; // advance width
+
+  // [experimental] actualBoundingBox* attributes
+  [Pref="dom.textMetrics.actualBoundingBox.enabled"]
+  readonly attribute double actualBoundingBoxLeft;
+  [Pref="dom.textMetrics.actualBoundingBox.enabled"]
+  readonly attribute double actualBoundingBoxRight;
+
+  // y-direction
+  // [experimental] fontBoundingBox* attributes
+  [Pref="dom.textMetrics.fontBoundingBox.enabled"]
+  readonly attribute double fontBoundingBoxAscent;
+  [Pref="dom.textMetrics.fontBoundingBox.enabled"]
+  readonly attribute double fontBoundingBoxDescent;
+
+  // [experimental] actualBoundingBox* attributes
+  [Pref="dom.textMetrics.actualBoundingBox.enabled"]
+  readonly attribute double actualBoundingBoxAscent;
+  [Pref="dom.textMetrics.actualBoundingBox.enabled"]
+  readonly attribute double actualBoundingBoxDescent;
+
+  // [experimental] emHeight* attributes
+  [Pref="dom.textMetrics.emHeight.enabled"]
+  readonly attribute double emHeightAscent;
+  [Pref="dom.textMetrics.emHeight.enabled"]
+  readonly attribute double emHeightDescent;
+
+  // [experimental] *Baseline attributes
+  [Pref="dom.textMetrics.baselines.enabled"]
+  readonly attribute double hangingBaseline;
+  [Pref="dom.textMetrics.baselines.enabled"]
+  readonly attribute double alphabeticBaseline;
+  [Pref="dom.textMetrics.baselines.enabled"]
+  readonly attribute double ideographicBaseline;
+};
+
+[Pref="canvas.path.enabled",
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread",
+ Exposed=(Window,Worker)]
+interface Path2D
+{
+  constructor();
+  constructor(Path2D other);
+  constructor(DOMString pathString);
+
+  [Throws] undefined addPath(Path2D path, optional DOMMatrix2DInit transform = {});
+};
+Path2D includes CanvasPathMethods;
diff --git a/dom/webidl/CaretPosition.webidl b/dom/webidl/CaretPosition.webidl
new file mode 100644
index 0000000000..2deb7d2d3f
--- /dev/null
+++ b/dom/webidl/CaretPosition.webidl
@@ -0,0 +1,21 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Exposed=Window]
+interface CaretPosition {
+
+  /**
+   * The offsetNode could potentially be null due to anonymous content.
+   */
+  readonly attribute Node? offsetNode;
+  readonly attribute unsigned long offset;
+
+};
+
+/**
+ * Gecko specific methods and properties for CaretPosition.
+ */
+partial interface CaretPosition {
+  DOMRect? getClientRect();
+};
diff --git a/dom/webidl/CaretStateChangedEvent.webidl b/dom/webidl/CaretStateChangedEvent.webidl
new file mode 100644
index 0000000000..0a661fe737
--- /dev/null
+++ b/dom/webidl/CaretStateChangedEvent.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum CaretChangedReason {
+  "visibilitychange",
+  "updateposition",
+  "longpressonemptycontent",
+  "taponcaret",
+  "presscaret",
+  "releasecaret",
+  "scroll",
+  "dragcaret"
+};
+
+dictionary CaretStateChangedEventInit : EventInit {
+  boolean collapsed = true;
+  DOMRectReadOnly? boundingClientRect = null;
+  CaretChangedReason reason = "visibilitychange";
+  boolean caretVisible = false;
+  boolean caretVisuallyVisible = false;
+  boolean selectionVisible = false;
+  boolean selectionEditable = false;
+  DOMString selectedTextContent = "";
+  long clientX = 0;
+  long clientY = 0;
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface CaretStateChangedEvent : Event {
+  constructor(DOMString type,
+              optional CaretStateChangedEventInit eventInit = {});
+
+  readonly attribute boolean collapsed;
+  /* The bounding client rect is relative to the visual viewport. */
+  readonly attribute DOMRectReadOnly? boundingClientRect;
+  readonly attribute CaretChangedReason reason;
+  readonly attribute boolean caretVisible;
+  readonly attribute boolean caretVisuallyVisible;
+  readonly attribute boolean selectionVisible;
+  readonly attribute boolean selectionEditable;
+  readonly attribute DOMString selectedTextContent;
+  [Pref="layout.accessiblecaret.magnifier.enabled"]
+  readonly attribute long clientX;
+  [Pref="layout.accessiblecaret.magnifier.enabled"]
+  readonly attribute long clientY;
+};
diff --git a/dom/webidl/ChannelMergerNode.webidl b/dom/webidl/ChannelMergerNode.webidl
new file mode 100644
index 0000000000..00fbf1bac4
--- /dev/null
+++ b/dom/webidl/ChannelMergerNode.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary ChannelMergerOptions : AudioNodeOptions {
+             unsigned long numberOfInputs = 6;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface ChannelMergerNode : AudioNode {
+  [Throws]
+  constructor(BaseAudioContext context,
+              optional ChannelMergerOptions options = {});
+};
diff --git a/dom/webidl/ChannelSplitterNode.webidl b/dom/webidl/ChannelSplitterNode.webidl
new file mode 100644
index 0000000000..e6cacbb7c3
--- /dev/null
+++ b/dom/webidl/ChannelSplitterNode.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary ChannelSplitterOptions : AudioNodeOptions {
+             unsigned long numberOfOutputs = 6;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface ChannelSplitterNode : AudioNode {
+  [Throws]
+  constructor(BaseAudioContext context,
+              optional ChannelSplitterOptions options = {});
+};
diff --git a/dom/webidl/CharacterData.webidl b/dom/webidl/CharacterData.webidl
new file mode 100644
index 0000000000..6b447af94b
--- /dev/null
+++ b/dom/webidl/CharacterData.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#characterdata
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface CharacterData : Node {
+  [Pure, SetterThrows]
+  attribute [LegacyNullToEmptyString] DOMString data;
+  [Pure]
+  readonly attribute unsigned long length;
+  [Throws]
+  DOMString substringData(unsigned long offset, unsigned long count);
+  [Throws]
+  undefined appendData(DOMString data);
+  [Throws]
+  undefined insertData(unsigned long offset, DOMString data);
+  [Throws]
+  undefined deleteData(unsigned long offset, unsigned long count);
+  [Throws]
+  undefined replaceData(unsigned long offset, unsigned long count, DOMString data);
+};
+
+CharacterData includes ChildNode;
+CharacterData includes NonDocumentTypeChildNode;
diff --git a/dom/webidl/CheckerboardReportService.webidl b/dom/webidl/CheckerboardReportService.webidl
new file mode 100644
index 0000000000..0869df7475
--- /dev/null
+++ b/dom/webidl/CheckerboardReportService.webidl
@@ -0,0 +1,60 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * This file declares data structures used to communicate checkerboard reports
+ * from C++ code to about:checkerboard (see bug 1238042). These dictionaries
+ * are NOT exposed to standard web content.
+ */
+
+enum CheckerboardReason {
+  "severe",
+  "recent"
+};
+
+// Individual checkerboard report. Contains fields for the severity of the
+// checkerboard event, the timestamp at which it was reported, the detailed
+// log of the event, and the reason this report was saved (currently either
+// "severe" or "recent").
+dictionary CheckerboardReport {
+  unsigned long severity;
+  DOMTimeStamp timestamp; // milliseconds since epoch
+  DOMString log;
+  CheckerboardReason reason;
+};
+
+// The guard function only allows creation of this interface on the
+// about:checkerboard page, and only if it's in the parent process.
+[Func="mozilla::dom::CheckerboardReportService::IsEnabled",
+ Exposed=Window]
+interface CheckerboardReportService {
+  constructor();
+
+  /**
+   * Gets the available checkerboard reports.
+   */
+  sequence<CheckerboardReport> getReports();
+
+  /**
+   * Gets the state of the apz.record_checkerboarding pref.
+   */
+  boolean isRecordingEnabled();
+
+  /**
+   * Sets the state of the apz.record_checkerboarding pref.
+   */
+  undefined setRecordingEnabled(boolean aEnabled);
+
+  /**
+   * Flush any in-progress checkerboard reports. Since this happens
+   * asynchronously, the caller may register an observer with the observer
+   * service to be notified when this operation is complete. The observer should
+   * listen for the topic "APZ:FlushActiveCheckerboard:Done". Upon receiving
+   * this notification, the caller may call getReports() to obtain the flushed
+   * reports, along with any other reports that are available.
+   */
+  undefined flushActiveReports();
+};
diff --git a/dom/webidl/ChildNode.webidl b/dom/webidl/ChildNode.webidl
new file mode 100644
index 0000000000..a82d192980
--- /dev/null
+++ b/dom/webidl/ChildNode.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#interface-childnode
+ */
+
+interface mixin ChildNode {
+  [CEReactions, Throws, Unscopable]
+  undefined before((Node or DOMString)... nodes);
+  [CEReactions, Throws, Unscopable]
+  undefined after((Node or DOMString)... nodes);
+  [CEReactions, Throws, Unscopable]
+  undefined replaceWith((Node or DOMString)... nodes);
+  [CEReactions, Unscopable]
+  undefined remove();
+};
+
+interface mixin NonDocumentTypeChildNode {
+  [Pure]
+  readonly attribute Element? previousElementSibling;
+  [Pure]
+  readonly attribute Element? nextElementSibling;
+};
diff --git a/dom/webidl/ChildSHistory.webidl b/dom/webidl/ChildSHistory.webidl
new file mode 100644
index 0000000000..8c8693aec6
--- /dev/null
+++ b/dom/webidl/ChildSHistory.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface nsISHistory;
+
+/**
+ * The ChildSHistory interface represents the child side of a browsing
+ * context's session history.
+ */
+[ChromeOnly,
+ Exposed=Window]
+interface ChildSHistory {
+  [Pure]
+  readonly attribute long count;
+  [Pure]
+  readonly attribute long index;
+
+  boolean canGo(long aOffset);
+  [Throws] undefined go(long aOffset, optional boolean aRequireUserInteraction = false, optional boolean aUserActivation = false);
+
+  /**
+   * Reload the current entry. The flags which should be passed to this
+   * function are documented and defined in nsIWebNavigation.idl
+   */
+  [Throws]
+  undefined reload(unsigned long aReloadFlags);
+
+  /**
+   * Getter for the legacy nsISHistory implementation.
+   *
+   * legacySHistory has been deprecated. Don't use it, but instead handle
+   * the interaction with nsISHistory in the parent process.
+   */
+  [Throws]
+  readonly attribute nsISHistory legacySHistory;
+};
diff --git a/dom/webidl/ChromeNodeList.webidl b/dom/webidl/ChromeNodeList.webidl
new file mode 100644
index 0000000000..2ec48873b7
--- /dev/null
+++ b/dom/webidl/ChromeNodeList.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly,
+ Exposed=Window]
+interface ChromeNodeList : NodeList {
+  constructor();
+
+  [Throws]
+  undefined append(Node aNode);
+  [Throws]
+  undefined remove(Node aNode);
+};
diff --git a/dom/webidl/Client.webidl b/dom/webidl/Client.webidl
new file mode 100644
index 0000000000..5dc9b6ea48
--- /dev/null
+++ b/dom/webidl/Client.webidl
@@ -0,0 +1,53 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/ServiceWorker/#client-interface
+ *
+ */
+
+[Exposed=ServiceWorker]
+interface Client {
+  readonly attribute USVString url;
+
+  // Remove frameType in bug 1290936
+  [BinaryName="GetFrameType"]
+  readonly attribute FrameType frameType;
+
+  readonly attribute ClientType type;
+  readonly attribute DOMString id;
+
+  // Implement reserved in bug 1264177
+  // readonly attribute boolean reserved;
+
+  [Throws]
+  undefined postMessage(any message, sequence<object> transfer);
+  [Throws]
+  undefined postMessage(any message, optional StructuredSerializeOptions aOptions = {});
+};
+
+[Exposed=ServiceWorker]
+interface WindowClient : Client {
+  [BinaryName="GetVisibilityState"]
+  readonly attribute VisibilityState visibilityState;
+  readonly attribute boolean focused;
+
+  // Implement ancestorOrigins in bug 1264180
+  // [SameObject] readonly attribute FrozenArray<USVString> ancestorOrigins;
+
+  [Throws, NewObject, NeedsCallerType]
+  Promise<WindowClient> focus();
+
+  [Throws, NewObject]
+  Promise<WindowClient> navigate(USVString url);
+};
+
+// Remove FrameType in bug 1290936
+enum FrameType {
+  "auxiliary",
+  "top-level",
+  "nested",
+  "none"
+};
diff --git a/dom/webidl/Clients.webidl b/dom/webidl/Clients.webidl
new file mode 100644
index 0000000000..4eda1dd7bd
--- /dev/null
+++ b/dom/webidl/Clients.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ *
+ */
+
+[Exposed=ServiceWorker]
+interface Clients {
+  // The objects returned will be new instances every time
+  [NewObject]
+  Promise<(Client or undefined)> get(DOMString id);
+  [NewObject]
+  Promise<sequence<Client>> matchAll(optional ClientQueryOptions options = {});
+  [NewObject]
+  Promise<WindowClient?> openWindow(USVString url);
+  [NewObject]
+  Promise<undefined> claim();
+};
+
+dictionary ClientQueryOptions {
+  boolean includeUncontrolled = false;
+  ClientType type = "window";
+};
+
+enum ClientType {
+  "window",
+  "worker",
+  "sharedworker",
+  // https://github.com/w3c/ServiceWorker/issues/1036
+  "serviceworker",
+  "all"
+};
diff --git a/dom/webidl/Clipboard.webidl b/dom/webidl/Clipboard.webidl
new file mode 100644
index 0000000000..46ef9e91e0
--- /dev/null
+++ b/dom/webidl/Clipboard.webidl
@@ -0,0 +1,67 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/clipboard-apis/
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+typedef sequence<ClipboardItem> ClipboardItems;
+
+[SecureContext, Exposed=Window]
+interface Clipboard : EventTarget {
+  [Pref="dom.events.asyncClipboard.clipboardItem", NewObject, NeedsSubjectPrincipal]
+  Promise<ClipboardItems> read();
+  [Func="Clipboard::ReadTextEnabled", NewObject, NeedsSubjectPrincipal]
+  Promise<DOMString> readText();
+
+  [Pref="dom.events.asyncClipboard.clipboardItem", NewObject, NeedsSubjectPrincipal]
+  Promise<undefined> write(ClipboardItems data);
+
+  [NewObject, NeedsSubjectPrincipal]
+  Promise<undefined> writeText(DOMString data);
+};
+
+partial interface Clipboard {
+  // @param allowed true, if the user allowed (e.g. clicked) the "Paste" menuitem.
+  //                false, when the menupopup was dismissed.
+  [ChromeOnly]
+  undefined onUserReactedToPasteMenuPopup(boolean allowed);
+};
+
+typedef (DOMString or Blob) ClipboardItemDataType;
+typedef Promise<ClipboardItemDataType> ClipboardItemData;
+// callback ClipboardItemDelayedCallback = ClipboardItemData ();
+
+[SecureContext, Exposed=Window, Pref="dom.events.asyncClipboard.clipboardItem"]
+interface ClipboardItem {
+  [Throws]
+  constructor(record<DOMString, ClipboardItemData> items,
+              optional ClipboardItemOptions options = {});
+
+  // static ClipboardItem createDelayed(
+  //     record<DOMString, ClipboardItemDelayedCallback> items,
+  //     optional ClipboardItemOptions options = {});
+
+  readonly attribute PresentationStyle presentationStyle;
+  // readonly attribute long long lastModified;
+  // readonly attribute boolean delayed;
+
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  // readonly attribute FrozenArray<DOMString> types;
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<DOMString> types;
+
+  [NewObject]
+  Promise<Blob> getType(DOMString type);
+};
+
+enum PresentationStyle { "unspecified", "inline", "attachment" };
+
+dictionary ClipboardItemOptions {
+  PresentationStyle presentationStyle = "unspecified";
+};
diff --git a/dom/webidl/ClipboardEvent.webidl b/dom/webidl/ClipboardEvent.webidl
new file mode 100644
index 0000000000..90ecfdb67d
--- /dev/null
+++ b/dom/webidl/ClipboardEvent.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/clipops/#x5-clipboard-event-interfaces
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface ClipboardEvent : Event
+{
+  [Throws]
+  constructor(DOMString type, optional ClipboardEventInit eventInitDict = {});
+
+  readonly attribute DataTransfer? clipboardData;
+};
+
+dictionary ClipboardEventInit : EventInit
+{
+  DOMString data = "";
+  DOMString dataType = "";
+};
diff --git a/dom/webidl/CloseEvent.webidl b/dom/webidl/CloseEvent.webidl
new file mode 100644
index 0000000000..a74e219fc4
--- /dev/null
+++ b/dom/webidl/CloseEvent.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The nsIDOMCloseEvent interface is the interface to the event
+ * close on a WebSocket object.
+ *
+ * For more information on this interface, please see
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/network.html#closeevent
+ */
+
+[LegacyEventInit,
+ Exposed=(Window,Worker)]
+interface CloseEvent : Event
+{
+  constructor(DOMString type, optional CloseEventInit eventInitDict = {});
+
+  readonly attribute boolean wasClean;
+  readonly attribute unsigned short code;
+  readonly attribute DOMString reason;
+};
+
+dictionary CloseEventInit : EventInit
+{
+  boolean wasClean = false;
+  unsigned short code = 0;
+  DOMString reason = "";
+};
diff --git a/dom/webidl/CommandEvent.webidl b/dom/webidl/CommandEvent.webidl
new file mode 100644
index 0000000000..da18f0dede
--- /dev/null
+++ b/dom/webidl/CommandEvent.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly, Exposed=Window]
+interface CommandEvent : Event {
+  readonly attribute DOMString? command;
+};
diff --git a/dom/webidl/Comment.webidl b/dom/webidl/Comment.webidl
new file mode 100644
index 0000000000..e3662a4d6c
--- /dev/null
+++ b/dom/webidl/Comment.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#comment
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface Comment : CharacterData {
+  [Throws]
+  constructor(optional DOMString data = "");
+};
diff --git a/dom/webidl/CompositionEvent.webidl b/dom/webidl/CompositionEvent.webidl
new file mode 100644
index 0000000000..4ebaa919f6
--- /dev/null
+++ b/dom/webidl/CompositionEvent.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://w3c.github.io/uievents/#interface-compositionevent
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface CompositionEvent : UIEvent
+{
+  constructor(DOMString type, optional CompositionEventInit eventInitDict = {});
+
+  readonly attribute DOMString? data;
+  // locale is currently non-standard
+  readonly attribute DOMString  locale;
+
+ /**
+  * ranges is trying to expose TextRangeArray in Gecko so a
+  * js-plugin couble be able to know the clauses information
+  */
+  [ChromeOnly,Cached,Pure]
+  readonly attribute sequence<TextClause> ranges;
+};
+
+dictionary CompositionEventInit : UIEventInit {
+  DOMString data = "";
+};
+
+partial interface CompositionEvent
+{
+  undefined initCompositionEvent(DOMString typeArg,
+                                 optional boolean canBubbleArg = false,
+                                 optional boolean cancelableArg = false,
+                                 optional Window? viewArg = null,
+                                 optional DOMString? dataArg = null,
+                                 optional DOMString localeArg = "");
+};
diff --git a/dom/webidl/CompressionStream.webidl b/dom/webidl/CompressionStream.webidl
new file mode 100644
index 0000000000..16c9af0ac1
--- /dev/null
+++ b/dom/webidl/CompressionStream.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://wicg.github.io/compression/#compression-stream
+ */
+
+enum CompressionFormat {
+  "deflate",
+  "deflate-raw",
+  "gzip",
+};
+
+[Exposed=*, Pref="dom.compression_streams.enabled"]
+interface CompressionStream {
+  [Throws]
+  constructor(CompressionFormat format);
+};
+CompressionStream includes GenericTransformStream;
diff --git a/dom/webidl/Console.webidl b/dom/webidl/Console.webidl
new file mode 100644
index 0000000000..5b98871391
--- /dev/null
+++ b/dom/webidl/Console.webidl
@@ -0,0 +1,246 @@
+/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://console.spec.whatwg.org/#console-namespace
+ */
+
+[Exposed=(Window,Worker,WorkerDebugger,Worklet),
+ ClassString="Console",
+ ProtoObjectHack]
+namespace console {
+
+  // NOTE: if you touch this namespace, remember to update the ConsoleInstance
+  // interface as well!
+
+  // Logging
+  [UseCounter]
+  undefined assert(optional boolean condition = false, any... data);
+  [UseCounter]
+  undefined clear();
+  [UseCounter]
+  undefined count(optional DOMString label = "default");
+  [UseCounter]
+  undefined countReset(optional DOMString label = "default");
+  [UseCounter]
+  undefined debug(any... data);
+  [UseCounter]
+  undefined error(any... data);
+  [UseCounter]
+  undefined info(any... data);
+  [UseCounter]
+  undefined log(any... data);
+  [UseCounter]
+  undefined table(any... data); // FIXME: The spec is still unclear about this.
+  [UseCounter]
+  undefined trace(any... data);
+  [UseCounter]
+  undefined warn(any... data);
+  [UseCounter]
+  undefined dir(any... data); // FIXME: This doesn't follow the spec yet.
+  [UseCounter]
+  undefined dirxml(any... data);
+
+  // Grouping
+  [UseCounter]
+  undefined group(any... data);
+  [UseCounter]
+  undefined groupCollapsed(any... data);
+  [UseCounter]
+  undefined groupEnd();
+
+  // Timing
+  [UseCounter]
+  undefined time(optional DOMString label = "default");
+  [UseCounter]
+  undefined timeLog(optional DOMString label = "default", any... data);
+  [UseCounter]
+  undefined timeEnd(optional DOMString label = "default");
+
+  // Mozilla only or Webcompat methods
+
+  [UseCounter]
+  undefined _exception(any... data);
+  [UseCounter]
+  undefined timeStamp(optional any data);
+
+  [UseCounter]
+  undefined profile(any... data);
+  [UseCounter]
+  undefined profileEnd(any... data);
+
+  [ChromeOnly]
+  const boolean IS_NATIVE_CONSOLE = true;
+
+  [ChromeOnly, NewObject]
+  ConsoleInstance createInstance(optional ConsoleInstanceOptions options = {});
+};
+
+// This is used to propagate console events to the observers.
+[GenerateConversionToJS]
+dictionary ConsoleEvent {
+  (unsigned long long or DOMString) ID;
+  (unsigned long long or DOMString) innerID;
+  DOMString consoleID = "";
+  DOMString addonId = "";
+  DOMString level = "";
+  DOMString filename = "";
+  // Unique identifier within the process for the script source this event is
+  // associated with, or zero.
+  unsigned long sourceId = 0;
+  unsigned long lineNumber = 0;
+  unsigned long columnNumber = 0;
+  DOMString functionName = "";
+  double timeStamp = 0;
+  double microSecondTimeStamp = 0;
+  sequence<any> arguments;
+  sequence<DOMString?> styles;
+  boolean private = false;
+  // stacktrace is handled via a getter in some cases so we can construct it
+  // lazily.  Note that we're not making this whole thing an interface because
+  // consumers expect to see own properties on it, which would mean making the
+  // props unforgeable, which means lots of JSFunction allocations.  Maybe we
+  // should fix those consumers, of course....
+  // sequence<ConsoleStackEntry> stacktrace;
+  DOMString groupName = "";
+  any timer = null;
+  any counter = null;
+  DOMString prefix = "";
+  boolean chromeContext = false;
+};
+
+// Event for profile operations
+[GenerateConversionToJS]
+dictionary ConsoleProfileEvent {
+  DOMString action = "";
+  sequence<any> arguments;
+  boolean chromeContext = false;
+};
+
+// This dictionary is used to manage stack trace data.
+[GenerateConversionToJS]
+dictionary ConsoleStackEntry {
+  DOMString filename = "";
+  // Unique identifier within the process for the script source this entry is
+  // associated with, or zero.
+  unsigned long sourceId = 0;
+  unsigned long lineNumber = 0;
+  unsigned long columnNumber = 0;
+  DOMString functionName = "";
+  DOMString? asyncCause;
+};
+
+[GenerateConversionToJS]
+dictionary ConsoleTimerStart {
+  DOMString name = "";
+};
+
+[GenerateConversionToJS]
+dictionary ConsoleTimerLogOrEnd {
+  DOMString name = "";
+  double duration = 0;
+};
+
+[GenerateConversionToJS]
+dictionary ConsoleTimerError {
+  DOMString error = "";
+  DOMString name = "";
+};
+
+[GenerateConversionToJS]
+dictionary ConsoleCounter {
+  DOMString label = "";
+  unsigned long count = 0;
+};
+
+[GenerateConversionToJS]
+dictionary ConsoleCounterError {
+  DOMString label = "";
+  DOMString error = "";
+};
+
+[ChromeOnly,
+ Exposed=(Window,Worker,WorkerDebugger,Worklet)]
+// This is basically a copy of the console namespace.
+interface ConsoleInstance {
+  // Logging
+  undefined assert(optional boolean condition = false, any... data);
+  undefined clear();
+  undefined count(optional DOMString label = "default");
+  undefined countReset(optional DOMString label = "default");
+  undefined debug(any... data);
+  undefined error(any... data);
+  undefined info(any... data);
+  undefined log(any... data);
+  undefined table(any... data); // FIXME: The spec is still unclear about this.
+  undefined trace(any... data);
+  undefined warn(any... data);
+  undefined dir(any... data); // FIXME: This doesn't follow the spec yet.
+  undefined dirxml(any... data);
+
+  // Grouping
+  undefined group(any... data);
+  undefined groupCollapsed(any... data);
+  undefined groupEnd();
+
+  // Timing
+  undefined time(optional DOMString label = "default");
+  undefined timeLog(optional DOMString label = "default", any... data);
+  undefined timeEnd(optional DOMString label = "default");
+
+  // Mozilla only or Webcompat methods
+
+  undefined _exception(any... data);
+  undefined timeStamp(optional any data);
+
+  undefined profile(any... data);
+  undefined profileEnd(any... data);
+};
+
+callback ConsoleInstanceDumpCallback = undefined (DOMString message);
+
+enum ConsoleLogLevel {
+  "All", "Debug", "Log", "Info", "Clear", "Trace", "TimeLog", "TimeEnd", "Time",
+  "Group", "GroupEnd", "Profile", "ProfileEnd", "Dir", "Dirxml", "Warn", "Error",
+  "Off"
+};
+
+dictionary ConsoleInstanceOptions {
+  // An optional function to intercept all strings written to stdout.
+  ConsoleInstanceDumpCallback dump;
+
+  // An optional prefix string to be printed before the actual logged message.
+  DOMString prefix = "";
+
+  // An ID representing the source of the message. Normally the inner ID of a
+  // DOM window.
+  DOMString innerID = "";
+
+  // String identified for the console, this will be passed through the console
+  // notifications.
+  DOMString consoleID = "";
+
+  // Identifier that allows to filter which messages are logged based on their
+  // log level.
+  ConsoleLogLevel maxLogLevel;
+
+  // String pref name which contains the level to use for maxLogLevel. If the
+  // pref doesn't exist, gets removed or it is used in workers, the maxLogLevel
+  // will default to the value passed to this constructor (or "all" if it wasn't
+  // specified).
+  DOMString maxLogLevelPref = "";
+};
+
+enum ConsoleLevel { "log", "warning", "error" };
+
+// this interface is just for testing
+partial interface ConsoleInstance {
+  [ChromeOnly]
+  undefined reportForServiceWorkerScope(DOMString scope, DOMString message,
+                                        DOMString filename, unsigned long lineNumber,
+                                        unsigned long columnNumber,
+                                        ConsoleLevel level);
+};
diff --git a/dom/webidl/ConstantSourceNode.webidl b/dom/webidl/ConstantSourceNode.webidl
new file mode 100644
index 0000000000..a7106b04db
--- /dev/null
+++ b/dom/webidl/ConstantSourceNode.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary ConstantSourceOptions {
+    float offset = 1;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface ConstantSourceNode :  AudioScheduledSourceNode {
+    constructor(BaseAudioContext context,
+                optional ConstantSourceOptions options = {});
+
+    readonly        attribute AudioParam   offset;
+};
diff --git a/dom/webidl/ContentVisibilityAutoStateChangeEvent.webidl b/dom/webidl/ContentVisibilityAutoStateChangeEvent.webidl
new file mode 100644
index 0000000000..91b7ca2e14
--- /dev/null
+++ b/dom/webidl/ContentVisibilityAutoStateChangeEvent.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://drafts.csswg.org/css-contain-2/#content-visibility-auto-state-changed
+ */
+
+[Exposed=Window, Pref="layout.css.content-visibility.enabled"]
+interface ContentVisibilityAutoStateChangeEvent : Event {
+  constructor(DOMString type,
+              optional ContentVisibilityAutoStateChangeEventInit eventInitDict = {});
+  readonly attribute boolean skipped;
+};
+
+dictionary ContentVisibilityAutoStateChangeEventInit : EventInit {
+  boolean skipped = false;
+};
diff --git a/dom/webidl/ConvolverNode.webidl b/dom/webidl/ConvolverNode.webidl
new file mode 100644
index 0000000000..cde74514a4
--- /dev/null
+++ b/dom/webidl/ConvolverNode.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary ConvolverOptions : AudioNodeOptions {
+             AudioBuffer? buffer;
+             boolean      disableNormalization = false;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface ConvolverNode : AudioNode {
+      [Throws]
+      constructor(BaseAudioContext context, optional
+                  ConvolverOptions options = {});
+
+      [SetterThrows]
+      attribute AudioBuffer? buffer;
+      attribute boolean normalize;
+
+};
+
+// Mozilla extension
+ConvolverNode includes AudioNodePassThrough;
diff --git a/dom/webidl/CreateOfferRequest.webidl b/dom/webidl/CreateOfferRequest.webidl
new file mode 100644
index 0000000000..f6ceb800ea
--- /dev/null
+++ b/dom/webidl/CreateOfferRequest.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This is an internal IDL file
+ */
+
+[ChromeOnly,
+ JSImplementation="@mozilla.org/dom/createofferrequest;1",
+ Exposed=Window]
+interface CreateOfferRequest {
+  readonly attribute unsigned long long windowID;
+  readonly attribute unsigned long long innerWindowID;
+  readonly attribute DOMString callID;
+  readonly attribute boolean isSecure;
+};
diff --git a/dom/webidl/CredentialManagement.webidl b/dom/webidl/CredentialManagement.webidl
new file mode 100644
index 0000000000..4b751a7537
--- /dev/null
+++ b/dom/webidl/CredentialManagement.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://www.w3.org/TR/credential-management-1/
+ * and
+ * https://w3c.github.io/webauthn/
+ * and
+ * https://fedidcg.github.io/FedCM/
+ */
+
+[Exposed=Window, SecureContext]
+interface Credential {
+  readonly attribute USVString id;
+  readonly attribute DOMString type;
+};
+
+[Exposed=Window, SecureContext]
+interface CredentialsContainer {
+  [NewObject]
+  Promise<Credential?> get(optional CredentialRequestOptions options = {});
+  [NewObject]
+  Promise<Credential?> create(optional CredentialCreationOptions options = {});
+  [NewObject]
+  Promise<Credential> store(Credential credential);
+  [NewObject]
+  Promise<undefined> preventSilentAccess();
+};
+
+dictionary CredentialRequestOptions {
+  // This is taken from the partial definition in
+  // https://w3c.github.io/webauthn/#sctn-credentialrequestoptions-extension
+  [Pref="security.webauth.webauthn"]
+  PublicKeyCredentialRequestOptions publicKey;
+  // This is taken from the partial definition in
+  // https://fedidcg.github.io/FedCM/#browser-api-credential-request-options
+  [Pref="dom.security.credentialmanagement.identity.enabled"]
+  IdentityCredentialRequestOptions identity;
+  AbortSignal signal;
+};
+
+dictionary CredentialCreationOptions {
+  // This is taken from the partial definition in
+  // https://w3c.github.io/webauthn/#sctn-credentialcreationoptions-extension
+  [Pref="security.webauth.webauthn"]
+  PublicKeyCredentialCreationOptions publicKey;
+  AbortSignal signal;
+};
diff --git a/dom/webidl/Crypto.webidl b/dom/webidl/Crypto.webidl
new file mode 100644
index 0000000000..538eefb159
--- /dev/null
+++ b/dom/webidl/Crypto.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html#crypto-interface
+ */
+
+[Exposed=(Window,Worker)]
+interface mixin GlobalCrypto {
+  [Throws] readonly attribute Crypto crypto;
+};
+
+[Exposed=(Window,Worker)]
+interface Crypto {
+  [SecureContext]
+  readonly attribute SubtleCrypto subtle;
+
+  [Throws]
+  ArrayBufferView getRandomValues(ArrayBufferView array);
+
+  [SecureContext, Pref="dom.crypto.randomUUID.enabled"]
+  UTF8String randomUUID();
+};
diff --git a/dom/webidl/CustomElementRegistry.webidl b/dom/webidl/CustomElementRegistry.webidl
new file mode 100644
index 0000000000..8c10f2f41f
--- /dev/null
+++ b/dom/webidl/CustomElementRegistry.webidl
@@ -0,0 +1,64 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// https://html.spec.whatwg.org/#dom-window-customelements
+[Exposed=Window]
+interface CustomElementRegistry {
+  [CEReactions, Throws, UseCounter]
+  undefined define(DOMString name, CustomElementConstructor constructor,
+                   optional ElementDefinitionOptions options = {});
+  [ChromeOnly, Throws]
+  undefined setElementCreationCallback(DOMString name, CustomElementCreationCallback callback);
+  (CustomElementConstructor or undefined) get(DOMString name);
+  [Throws]
+  Promise<CustomElementConstructor> whenDefined(DOMString name);
+  [CEReactions] undefined upgrade(Node root);
+};
+
+dictionary ElementDefinitionOptions {
+  DOMString extends;
+};
+
+callback constructor CustomElementConstructor = any ();
+
+[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
+callback CustomElementCreationCallback = undefined (DOMString name);
+
+[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
+callback LifecycleConnectedCallback = undefined();
+[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
+callback LifecycleDisconnectedCallback = undefined();
+[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
+callback LifecycleAdoptedCallback = undefined(Document? oldDocument,
+                                              Document? newDocment);
+[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
+callback LifecycleAttributeChangedCallback = undefined(DOMString attrName,
+                                                       DOMString? oldValue,
+                                                       DOMString? newValue,
+                                                       DOMString? namespaceURI);
+[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
+callback LifecycleFormAssociatedCallback = undefined(HTMLFormElement? form);
+[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
+callback LifecycleFormResetCallback = undefined();
+[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
+callback LifecycleFormDisabledCallback = undefined(boolean disabled);
+[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
+callback LifecycleGetCustomInterfaceCallback = object?(any iid);
+
+// Unsorted is necessary until https://github.com/whatwg/html/issues/3580 is resolved.
+[GenerateInit, Unsorted]
+dictionary LifecycleCallbacks {
+  LifecycleConnectedCallback connectedCallback;
+  LifecycleDisconnectedCallback disconnectedCallback;
+  LifecycleAdoptedCallback adoptedCallback;
+  LifecycleAttributeChangedCallback attributeChangedCallback;
+  [ChromeOnly] LifecycleGetCustomInterfaceCallback getCustomInterfaceCallback;
+};
+
+[GenerateInit, Unsorted]
+dictionary FormAssociatedLifecycleCallbacks {
+  LifecycleFormAssociatedCallback formAssociatedCallback;
+  LifecycleFormResetCallback formResetCallback;
+  LifecycleFormDisabledCallback formDisabledCallback;
+};
diff --git a/dom/webidl/CustomEvent.webidl b/dom/webidl/CustomEvent.webidl
new file mode 100644
index 0000000000..6543bb1e86
--- /dev/null
+++ b/dom/webidl/CustomEvent.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window, Worker)]
+interface CustomEvent : Event
+{
+  constructor(DOMString type, optional CustomEventInit eventInitDict = {});
+
+  readonly attribute any detail;
+
+  // initCustomEvent is a Gecko specific deprecated method.
+  undefined initCustomEvent(DOMString type,
+                            optional boolean canBubble = false,
+                            optional boolean cancelable = false,
+                            optional any detail = null);
+};
+
+dictionary CustomEventInit : EventInit
+{
+  any detail = null;
+};
diff --git a/dom/webidl/DOMException.webidl b/dom/webidl/DOMException.webidl
new file mode 100644
index 0000000000..44f93a4a1a
--- /dev/null
+++ b/dom/webidl/DOMException.webidl
@@ -0,0 +1,109 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webidl.spec.whatwg.org/#idl-DOMException
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+
+// This is the WebIDL version of nsIException.  This is mostly legacy stuff.
+
+interface StackFrame;
+
+interface mixin ExceptionMembers
+{
+  // The nsresult associated with this exception.
+  readonly attribute unsigned long           result;
+
+  // Filename location.  This is the location that caused the
+  // error, which may or may not be a source file location.
+  // For example, standard language errors would generally have
+  // the same location as their top stack entry.  File
+  // parsers may put the location of the file they were parsing,
+  // etc.
+
+  // null indicates "no data"
+  readonly attribute DOMString               filename;
+  // Valid line numbers begin at '1'. '0' indicates unknown.
+  readonly attribute unsigned long           lineNumber;
+  // Valid column numbers begin at 0.
+  // We don't have an unambiguous indicator for unknown.
+  readonly attribute unsigned long           columnNumber;
+
+  // A stack trace, if available.  nsIStackFrame does not have classinfo so
+  // this was only ever usefully available to chrome JS.
+  [ChromeOnly, Exposed=Window]
+  readonly attribute StackFrame?             location;
+
+  // Arbitary data for the implementation.
+  [Exposed=Window]
+  readonly attribute nsISupports?            data;
+
+  // Formatted exception stack
+  [Replaceable]
+  readonly attribute DOMString               stack;
+};
+
+[LegacyNoInterfaceObject, Exposed=(Window,Worker)]
+interface Exception {
+  // The name of the error code (ie, a string repr of |result|).
+  readonly attribute DOMString               name;
+  // A custom message set by the thrower.
+  [BinaryName="messageMoz"]
+  readonly attribute DOMString               message;
+  // A generic formatter - make it suitable to print, etc.
+  stringifier;
+};
+
+Exception includes ExceptionMembers;
+
+// XXXkhuey this is an 'exception', not an interface, but we don't have any
+// parser or codegen mechanisms for dealing with exceptions.
+[ExceptionClass,
+ Exposed=(Window, Worker),
+ Serializable]
+interface DOMException {
+  constructor(optional DOMString message = "", optional DOMString name);
+
+  // The name of the error code (ie, a string repr of |result|).
+  readonly attribute DOMString               name;
+  // A custom message set by the thrower.
+  [BinaryName="messageMoz"]
+  readonly attribute DOMString               message;
+  readonly attribute unsigned short code;
+
+  const unsigned short INDEX_SIZE_ERR = 1;
+  const unsigned short DOMSTRING_SIZE_ERR = 2; // historical
+  const unsigned short HIERARCHY_REQUEST_ERR = 3;
+  const unsigned short WRONG_DOCUMENT_ERR = 4;
+  const unsigned short INVALID_CHARACTER_ERR = 5;
+  const unsigned short NO_DATA_ALLOWED_ERR = 6; // historical
+  const unsigned short NO_MODIFICATION_ALLOWED_ERR = 7;
+  const unsigned short NOT_FOUND_ERR = 8;
+  const unsigned short NOT_SUPPORTED_ERR = 9;
+  const unsigned short INUSE_ATTRIBUTE_ERR = 10; // historical
+  const unsigned short INVALID_STATE_ERR = 11;
+  const unsigned short SYNTAX_ERR = 12;
+  const unsigned short INVALID_MODIFICATION_ERR = 13;
+  const unsigned short NAMESPACE_ERR = 14;
+  const unsigned short INVALID_ACCESS_ERR = 15;
+  const unsigned short VALIDATION_ERR = 16; // historical
+  const unsigned short TYPE_MISMATCH_ERR = 17; // historical; use JavaScript's TypeError instead
+  const unsigned short SECURITY_ERR = 18;
+  const unsigned short NETWORK_ERR = 19;
+  const unsigned short ABORT_ERR = 20;
+  const unsigned short URL_MISMATCH_ERR = 21;
+  const unsigned short QUOTA_EXCEEDED_ERR = 22;
+  const unsigned short TIMEOUT_ERR = 23;
+  const unsigned short INVALID_NODE_TYPE_ERR = 24;
+  const unsigned short DATA_CLONE_ERR = 25;
+};
+
+// XXXkhuey copy all of Gecko's non-standard stuff onto DOMException, but leave
+// the prototype chain sane.
+DOMException includes ExceptionMembers;
diff --git a/dom/webidl/DOMImplementation.webidl b/dom/webidl/DOMImplementation.webidl
new file mode 100644
index 0000000000..9f3be87557
--- /dev/null
+++ b/dom/webidl/DOMImplementation.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#interface-domimplementation
+ *
+ * Copyright:
+ * To the extent possible under law, the editors have waived all copyright and
+ * related or neighboring rights to this work.
+ */
+
+[Exposed=Window]
+interface DOMImplementation {
+  boolean hasFeature();
+
+  [Throws]
+  DocumentType createDocumentType(DOMString qualifiedName, DOMString publicId,
+                                  DOMString systemId);
+  [Throws]
+  Document createDocument(DOMString? namespace,
+                          [LegacyNullToEmptyString] DOMString qualifiedName,
+                          optional DocumentType? doctype = null);
+  [Throws]
+  Document createHTMLDocument(optional DOMString title);
+};
diff --git a/dom/webidl/DOMLocalization.webidl b/dom/webidl/DOMLocalization.webidl
new file mode 100644
index 0000000000..b229f37c5e
--- /dev/null
+++ b/dom/webidl/DOMLocalization.webidl
@@ -0,0 +1,166 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * DOMLocalization is an extension of the Fluent Localization API.
+ *
+ * DOMLocalization adds a state for storing `roots` - DOM elements
+ * which translation status is controlled by the DOMLocalization
+ * instance and monitored for mutations.
+ * DOMLocalization also adds methods dedicated to DOM manipulation.
+ *
+ * Methods:
+ *    - connectRoot        - add a root
+ *    - disconnectRoot     - remove a root
+ *    - pauseObserving     - pause observing of roots
+ *    - resumeObserving    - resume observing of roots
+ *    - setAttributes      - set l10n attributes of an element
+ *    - getAttributes      - retrieve l10n attributes of an element
+ *    - translateFragment  - translate a DOM fragment
+ *    - translateElements  - translate a list of DOM elements
+ *    - translateRoots     - translate all attached roots
+ *
+ */
+
+[Func="IsChromeOrUAWidget", Exposed=Window]
+interface DOMLocalization : Localization {
+  /**
+   * Constructor arguments:
+   *    - aResourceids       - a list of localization resource URIs
+   *                           which will provide messages for this
+   *                           Localization instance.
+   *    - aSync              - Specifies if the initial state of the DOMLocalization
+   *                           and the underlying Localization API is synchronous.
+   *                           This enables a number of synchronous methods on the
+   *                           Localization API and uses it for `TranslateElements`
+   *                           making the method return a synchronusly resolved promise.
+   *    - aRegistry            - optional custom L10nRegistry to be used by this Localization instance.
+   *    - aLocales             - custom set of locales to be used for this Localization.
+   */
+  [Throws]
+  constructor(sequence<L10nResourceId> aResourceIds,
+              optional boolean aSync = false,
+              optional L10nRegistry aRegistry,
+              optional sequence<UTF8String> aLocales);
+
+  /**
+   * Adds a node to nodes observed for localization
+   * related changes.
+   */
+  undefined connectRoot(Node aElement);
+
+  /**
+   * Removes a node from nodes observed for localization
+   * related changes.
+   */
+  undefined disconnectRoot(Node aElement);
+
+  /**
+   * Pauses the MutationObserver set to observe
+   * localization related DOM mutations.
+   */
+  undefined pauseObserving();
+
+  /**
+   * Resumes the MutationObserver set to observe
+   * localization related DOM mutations.
+   */
+  undefined resumeObserving();
+
+  /**
+   * A helper function which allows the user to set localization-specific attributes
+   * on an element.
+   * This method lives on `document.l10n` for compatibility reasons with the
+   * JS FluentDOM implementation. We may consider moving it onto Element.
+   *
+   * Example:
+   *    document.l10n.setAttributes(h1, "key1", { emailCount: 5 });
+   *
+   *    <h1 data-l10n-id="key1" data-l10n-args="{\"emailCount\": 5}"/>
+   */
+  [Throws] undefined setAttributes(Element aElement, DOMString aId, optional object? aArgs);
+
+  /**
+   * A helper function which allows the user to retrieve a set of localization-specific
+   * attributes from an element.
+   * This method lives on `document.l10n` for compatibility reasons with the
+   * JS FluentDOM implementation. We may consider moving it onto Element.
+   *
+   * Example:
+   *    let l10nAttrs = document.l10n.getAttributes(h1);
+   *    assert.deepEqual(l10nAttrs, {id: "key1", args: { emailCount: 5});
+   */
+  [Throws] L10nIdArgs getAttributes(Element aElement);
+
+  /**
+   * A helper function which allows the user to set the l10n args for an element. This
+   * is similar to the setAttributes method, but does not require the l10n ID.
+   *
+   * Example:
+   *
+   *    <h1 data-l10n-id="key1" />
+   *
+   *    document.l10n.setArgs(h1, { emailCount: 5 });
+   *
+   *    <h1 data-l10n-id="key1" data-l10n-args="{\"emailCount\": 5}" />
+   *
+   *    document.l10n.setArgs(h1);
+   *
+   *    <h1 data-l10n-id="key1" />
+   */
+  [Throws] undefined setArgs(Element aElement, optional object? aArgs);
+
+  /**
+   * Triggers translation of a subtree rooted at aNode.
+   *
+   * The method finds all translatable descendants of the argument and
+   * localizes them.
+   *
+   * This method is mainly useful to trigger translation not covered by the
+   * DOMLocalization's MutationObserver - for example before it gets attached
+   * to the tree.
+   * In such cases, when the already-translated fragment gets
+   * injected into the observed root, one should `pauseObserving`,
+   * then append the fragment, and finally `resumeObserving`.
+   *
+   * Example:
+   *    await document.l10n.translatFragment(frag);
+   *    root.pauseObserving();
+   *    parent.appendChild(frag);
+   *    root.resumeObserving();
+   */
+  [NewObject] Promise<any> translateFragment(Node aNode);
+
+  /**
+   * Triggers translation of a list of Elements using the localization context.
+   *
+   * The method only translates the elements directly passed to the method,
+   * not any descendant nodes.
+   *
+   * This method is mainly useful to trigger translation not covered by the
+   * DOMLocalization's MutationObserver - for example before it gets attached
+   * to the tree.
+   * In such cases, when the already-translated fragment gets
+   * injected into the observed root, one should `pauseObserving`,
+   * then append the fragment, and finally `resumeObserving`.
+   *
+   * Example:
+   *    await document.l10n.translateElements([elem1, elem2]);
+   *    root.pauseObserving();
+   *    parent.appendChild(elem1);
+   *    root.resumeObserving();
+   *    alert(elem2.textContent);
+   */
+  [NewObject] Promise<undefined> translateElements(sequence<Element> aElements);
+
+  /**
+   * Triggers translation of all attached roots and sets their
+   * locale info and directionality attributes.
+   *
+   * Example:
+   *    await document.l10n.translateRoots();
+   */
+  [NewObject] Promise<undefined> translateRoots();
+};
diff --git a/dom/webidl/DOMMatrix.webidl b/dom/webidl/DOMMatrix.webidl
new file mode 100644
index 0000000000..5f7a1dcfe6
--- /dev/null
+++ b/dom/webidl/DOMMatrix.webidl
@@ -0,0 +1,186 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.fxtf.org/geometry/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker),
+ Serializable]
+interface DOMMatrixReadOnly {
+    [Throws]
+    constructor(optional (UTF8String or sequence<unrestricted double> or DOMMatrixReadOnly) init);
+
+    [NewObject, Throws] static DOMMatrixReadOnly fromMatrix(optional DOMMatrixInit other = {});
+    [NewObject, Throws] static DOMMatrixReadOnly fromFloat32Array(Float32Array array32);
+    [NewObject, Throws] static DOMMatrixReadOnly fromFloat64Array(Float64Array array64);
+
+
+    // These attributes are simple aliases for certain elements of the 4x4 matrix
+    readonly attribute unrestricted double a;
+    readonly attribute unrestricted double b;
+    readonly attribute unrestricted double c;
+    readonly attribute unrestricted double d;
+    readonly attribute unrestricted double e;
+    readonly attribute unrestricted double f;
+
+    readonly attribute unrestricted double m11;
+    readonly attribute unrestricted double m12;
+    readonly attribute unrestricted double m13;
+    readonly attribute unrestricted double m14;
+    readonly attribute unrestricted double m21;
+    readonly attribute unrestricted double m22;
+    readonly attribute unrestricted double m23;
+    readonly attribute unrestricted double m24;
+    readonly attribute unrestricted double m31;
+    readonly attribute unrestricted double m32;
+    readonly attribute unrestricted double m33;
+    readonly attribute unrestricted double m34;
+    readonly attribute unrestricted double m41;
+    readonly attribute unrestricted double m42;
+    readonly attribute unrestricted double m43;
+    readonly attribute unrestricted double m44;
+
+    // Immutable transform methods
+    DOMMatrix translate(optional unrestricted double tx = 0,
+                        optional unrestricted double ty = 0,
+                        optional unrestricted double tz = 0);
+    [NewObject] DOMMatrix scale(optional unrestricted double scaleX = 1,
+                                optional unrestricted double scaleY,
+                                optional unrestricted double scaleZ = 1,
+                                optional unrestricted double originX = 0,
+                                optional unrestricted double originY = 0,
+                                optional unrestricted double originZ = 0);
+    [NewObject] DOMMatrix scaleNonUniform(optional unrestricted double scaleX = 1,
+                                          optional unrestricted double scaleY = 1);
+    DOMMatrix scale3d(optional unrestricted double scale = 1,
+                      optional unrestricted double originX = 0,
+                      optional unrestricted double originY = 0,
+                      optional unrestricted double originZ = 0);
+    [NewObject] DOMMatrix rotate(optional unrestricted double rotX = 0,
+                                 optional unrestricted double rotY,
+                                 optional unrestricted double rotZ);
+    [NewObject] DOMMatrix rotateFromVector(optional unrestricted double x = 0,
+                                           optional unrestricted double y = 0);
+    [NewObject] DOMMatrix rotateAxisAngle(optional unrestricted double x = 0,
+                                          optional unrestricted double y = 0,
+                                          optional unrestricted double z = 0,
+                                          optional unrestricted double angle = 0);
+    DOMMatrix skewX(optional unrestricted double sx = 0);
+    DOMMatrix skewY(optional unrestricted double sy = 0);
+    [NewObject, Throws] DOMMatrix multiply(optional DOMMatrixInit other = {});
+    DOMMatrix flipX();
+    DOMMatrix flipY();
+    DOMMatrix inverse();
+
+    // Helper methods
+    readonly attribute boolean is2D;
+    readonly attribute boolean isIdentity;
+    DOMPoint                   transformPoint(optional DOMPointInit point = {});
+    [Throws] Float32Array      toFloat32Array();
+    [Throws] Float64Array      toFloat64Array();
+    [Exposed=Window, Throws]   stringifier;
+    [Default] object           toJSON();
+};
+
+[Exposed=(Window,Worker),
+ Serializable,
+ LegacyWindowAlias=WebKitCSSMatrix]
+interface DOMMatrix : DOMMatrixReadOnly {
+    [Throws]
+    constructor(optional (UTF8String or sequence<unrestricted double> or DOMMatrixReadOnly) init);
+
+    [NewObject, Throws] static DOMMatrix fromMatrix(optional DOMMatrixInit other = {});
+    [NewObject, Throws] static DOMMatrix fromFloat32Array(Float32Array array32);
+    [NewObject, Throws] static DOMMatrix fromFloat64Array(Float64Array array64);
+
+
+    // These attributes are simple aliases for certain elements of the 4x4 matrix
+    inherit attribute unrestricted double a;
+    inherit attribute unrestricted double b;
+    inherit attribute unrestricted double c;
+    inherit attribute unrestricted double d;
+    inherit attribute unrestricted double e;
+    inherit attribute unrestricted double f;
+
+    inherit attribute unrestricted double m11;
+    inherit attribute unrestricted double m12;
+    inherit attribute unrestricted double m13;
+    inherit attribute unrestricted double m14;
+    inherit attribute unrestricted double m21;
+    inherit attribute unrestricted double m22;
+    inherit attribute unrestricted double m23;
+    inherit attribute unrestricted double m24;
+    inherit attribute unrestricted double m31;
+    inherit attribute unrestricted double m32;
+    inherit attribute unrestricted double m33;
+    inherit attribute unrestricted double m34;
+    inherit attribute unrestricted double m41;
+    inherit attribute unrestricted double m42;
+    inherit attribute unrestricted double m43;
+    inherit attribute unrestricted double m44;
+
+    // Mutable transform methods
+    [Throws] DOMMatrix multiplySelf(optional DOMMatrixInit other = {});
+    [Throws] DOMMatrix preMultiplySelf(optional DOMMatrixInit other = {});
+    DOMMatrix translateSelf(optional unrestricted double tx = 0,
+                            optional unrestricted double ty = 0,
+                            optional unrestricted double tz = 0);
+    DOMMatrix scaleSelf(optional unrestricted double scaleX = 1,
+                        optional unrestricted double scaleY,
+                        optional unrestricted double scaleZ = 1,
+                        optional unrestricted double originX = 0,
+                        optional unrestricted double originY = 0,
+                        optional unrestricted double originZ = 0);
+    DOMMatrix scale3dSelf(optional unrestricted double scale = 1,
+                          optional unrestricted double originX = 0,
+                          optional unrestricted double originY = 0,
+                          optional unrestricted double originZ = 0);
+    DOMMatrix rotateSelf(optional unrestricted double rotX = 0,
+                         optional unrestricted double rotY,
+                         optional unrestricted double rotZ);
+    DOMMatrix rotateFromVectorSelf(optional unrestricted double x = 0,
+                                   optional unrestricted double y = 0);
+    DOMMatrix rotateAxisAngleSelf(optional unrestricted double x = 0,
+                                  optional unrestricted double y = 0,
+                                  optional unrestricted double z = 0,
+                                  optional unrestricted double angle = 0);
+    DOMMatrix skewXSelf(optional unrestricted double sx = 0);
+    DOMMatrix skewYSelf(optional unrestricted double sy = 0);
+    DOMMatrix invertSelf();
+    [Exposed=Window, Throws] DOMMatrix setMatrixValue(UTF8String transformList);
+};
+
+dictionary DOMMatrix2DInit {
+    unrestricted double a;
+    unrestricted double b;
+    unrestricted double c;
+    unrestricted double d;
+    unrestricted double e;
+    unrestricted double f;
+    unrestricted double m11;
+    unrestricted double m12;
+    unrestricted double m21;
+    unrestricted double m22;
+    unrestricted double m41;
+    unrestricted double m42;
+};
+
+dictionary DOMMatrixInit : DOMMatrix2DInit {
+    unrestricted double m13 = 0;
+    unrestricted double m14 = 0;
+    unrestricted double m23 = 0;
+    unrestricted double m24 = 0;
+    unrestricted double m31 = 0;
+    unrestricted double m32 = 0;
+    unrestricted double m33 = 1;
+    unrestricted double m34 = 0;
+    unrestricted double m43 = 0;
+    unrestricted double m44 = 1;
+    boolean is2D;
+};
diff --git a/dom/webidl/DOMParser.webidl b/dom/webidl/DOMParser.webidl
new file mode 100644
index 0000000000..8c8e62cdbf
--- /dev/null
+++ b/dom/webidl/DOMParser.webidl
@@ -0,0 +1,49 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://domparsing.spec.whatwg.org/#the-domparser-interface
+ */
+
+interface Principal;
+interface URI;
+interface InputStream;
+
+enum SupportedType {
+  "text/html",
+  "text/xml",
+  "application/xml",
+  "application/xhtml+xml",
+  "image/svg+xml"
+};
+
+[Exposed=Window]
+interface DOMParser {
+  [Throws]
+  constructor();
+
+  [NewObject, Throws, UseCounter]
+  Document parseFromString(DOMString str, SupportedType type);
+
+  [NewObject, ChromeOnly, Throws]
+  Document parseFromSafeString(DOMString str, SupportedType type);
+
+  // Mozilla-specific stuff
+  [NewObject, Throws, ChromeOnly]
+  Document parseFromBuffer(sequence<octet> buf, SupportedType type);
+  [NewObject, Throws, ChromeOnly]
+  Document parseFromBuffer(Uint8Array buf, SupportedType type);
+  [NewObject, Throws, ChromeOnly]
+  Document parseFromStream(InputStream stream, DOMString? charset,
+                           long contentLength, SupportedType type);
+  // Can be used to allow a DOMParser to parse XUL/XBL no matter what
+  // principal it's using for the document.
+  [ChromeOnly]
+  undefined forceEnableXULXBL();
+
+  // Can be used to allow a DOMParser to load DTDs from URLs that
+  // normally would not be allowed based on the document principal.
+  [Func="IsChromeOrUAWidget"]
+  undefined forceEnableDTD();
+};
diff --git a/dom/webidl/DOMPoint.webidl b/dom/webidl/DOMPoint.webidl
new file mode 100644
index 0000000000..ad95b2f716
--- /dev/null
+++ b/dom/webidl/DOMPoint.webidl
@@ -0,0 +1,54 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.fxtf.org/geometry/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker),
+ Serializable]
+interface DOMPointReadOnly {
+    constructor(optional unrestricted double x = 0,
+                optional unrestricted double y = 0,
+                optional unrestricted double z = 0,
+                optional unrestricted double w = 1);
+
+    [NewObject] static DOMPointReadOnly fromPoint(optional DOMPointInit other = {});
+
+    readonly attribute unrestricted double x;
+    readonly attribute unrestricted double y;
+    readonly attribute unrestricted double z;
+    readonly attribute unrestricted double w;
+
+    [NewObject, Throws] DOMPoint matrixTransform(optional DOMMatrixInit matrix = {});
+
+    [Default] object toJSON();
+};
+
+[Exposed=(Window,Worker),
+ Serializable]
+interface DOMPoint : DOMPointReadOnly {
+    constructor(optional unrestricted double x = 0,
+                optional unrestricted double y = 0,
+                optional unrestricted double z = 0,
+                optional unrestricted double w = 1);
+
+    [NewObject] static DOMPoint fromPoint(optional DOMPointInit other = {});
+
+    inherit attribute unrestricted double x;
+    inherit attribute unrestricted double y;
+    inherit attribute unrestricted double z;
+    inherit attribute unrestricted double w;
+};
+
+dictionary DOMPointInit {
+    unrestricted double x = 0;
+    unrestricted double y = 0;
+    unrestricted double z = 0;
+    unrestricted double w = 1;
+};
diff --git a/dom/webidl/DOMQuad.webidl b/dom/webidl/DOMQuad.webidl
new file mode 100644
index 0000000000..bc3518890a
--- /dev/null
+++ b/dom/webidl/DOMQuad.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.fxtf.org/geometry/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker),
+ Serializable]
+interface DOMQuad {
+    constructor(optional DOMPointInit p1 = {}, optional DOMPointInit p2 = {},
+                optional DOMPointInit p3 = {}, optional DOMPointInit p4 = {});
+    constructor(DOMRectReadOnly rect);
+
+    [NewObject] static DOMQuad fromRect(optional DOMRectInit other = {});
+    [NewObject] static DOMQuad fromQuad(optional DOMQuadInit other = {});
+
+    [SameObject] readonly attribute DOMPoint p1;
+    [SameObject] readonly attribute DOMPoint p2;
+    [SameObject] readonly attribute DOMPoint p3;
+    [SameObject] readonly attribute DOMPoint p4;
+    [NewObject] DOMRectReadOnly getBounds();
+
+    [Default] object toJSON();
+};
+
+dictionary DOMQuadInit {
+    DOMPointInit p1 = {};
+    DOMPointInit p2 = {};
+    DOMPointInit p3 = {};
+    DOMPointInit p4 = {};
+};
diff --git a/dom/webidl/DOMRect.webidl b/dom/webidl/DOMRect.webidl
new file mode 100644
index 0000000000..c1c7e5c8c4
--- /dev/null
+++ b/dom/webidl/DOMRect.webidl
@@ -0,0 +1,57 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.fxtf.org/geometry/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker),
+ Serializable]
+interface DOMRect : DOMRectReadOnly {
+    constructor(optional unrestricted double x = 0,
+                optional unrestricted double y = 0,
+                optional unrestricted double width = 0,
+                optional unrestricted double height = 0);
+
+    [NewObject] static DOMRect fromRect(optional DOMRectInit other = {});
+
+    inherit attribute unrestricted double x;
+    inherit attribute unrestricted double y;
+    inherit attribute unrestricted double width;
+    inherit attribute unrestricted double height;
+};
+
+[ProbablyShortLivingWrapper,
+ Exposed=(Window,Worker),
+ Serializable]
+interface DOMRectReadOnly {
+    constructor(optional unrestricted double x = 0,
+                optional unrestricted double y = 0,
+                optional unrestricted double width = 0,
+                optional unrestricted double height = 0);
+
+    [NewObject] static DOMRectReadOnly fromRect(optional DOMRectInit other = {});
+
+    readonly attribute unrestricted double x;
+    readonly attribute unrestricted double y;
+    readonly attribute unrestricted double width;
+    readonly attribute unrestricted double height;
+    readonly attribute unrestricted double top;
+    readonly attribute unrestricted double right;
+    readonly attribute unrestricted double bottom;
+    readonly attribute unrestricted double left;
+
+    [Default] object toJSON();
+};
+
+dictionary DOMRectInit {
+    unrestricted double x = 0;
+    unrestricted double y = 0;
+    unrestricted double width = 0;
+    unrestricted double height = 0;
+};
diff --git a/dom/webidl/DOMRectList.webidl b/dom/webidl/DOMRectList.webidl
new file mode 100644
index 0000000000..8257f73327
--- /dev/null
+++ b/dom/webidl/DOMRectList.webidl
@@ -0,0 +1,11 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface DOMRectList {
+  readonly attribute unsigned long length;
+  getter DOMRect? item(unsigned long index);
+};
diff --git a/dom/webidl/DOMRequest.webidl b/dom/webidl/DOMRequest.webidl
new file mode 100644
index 0000000000..e7e40cfd6d
--- /dev/null
+++ b/dom/webidl/DOMRequest.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum DOMRequestReadyState { "pending", "done" };
+
+[Exposed=(Window,Worker)]
+interface mixin DOMRequestShared {
+  readonly attribute DOMRequestReadyState readyState;
+
+  readonly attribute any result;
+  readonly attribute DOMException? error;
+
+  attribute EventHandler onsuccess;
+  attribute EventHandler onerror;
+};
+
+[Exposed=(Window,Worker)]
+interface DOMRequest : EventTarget {
+  // The [TreatNonCallableAsNull] annotation is required since then() should do
+  // nothing instead of throwing errors when non-callable arguments are passed.
+  // See documentation for Promise.then to see why we return "any".
+  [NewObject, Throws]
+  any then([TreatNonCallableAsNull] optional AnyCallback? fulfillCallback = null,
+           [TreatNonCallableAsNull] optional AnyCallback? rejectCallback = null);
+
+  [ChromeOnly]
+  undefined fireDetailedError(DOMException aError);
+};
+
+DOMRequest includes DOMRequestShared;
diff --git a/dom/webidl/DOMStringList.webidl b/dom/webidl/DOMStringList.webidl
new file mode 100644
index 0000000000..023956b5b6
--- /dev/null
+++ b/dom/webidl/DOMStringList.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface DOMStringList {
+  readonly attribute unsigned long length;
+  getter DOMString? item(unsigned long index);
+  boolean contains(DOMString string);
+};
diff --git a/dom/webidl/DOMStringMap.webidl b/dom/webidl/DOMStringMap.webidl
new file mode 100644
index 0000000000..5f9dcf54c1
--- /dev/null
+++ b/dom/webidl/DOMStringMap.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#domstringmap-0
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[LegacyOverrideBuiltIns,
+ Exposed=Window]
+interface DOMStringMap {
+  getter DOMString (DOMString name);
+  [CEReactions, Throws]
+  setter undefined (DOMString name, DOMString value);
+  [CEReactions]
+  deleter undefined (DOMString name);
+};
diff --git a/dom/webidl/DOMTokenList.webidl b/dom/webidl/DOMTokenList.webidl
new file mode 100644
index 0000000000..c048b2228c
--- /dev/null
+++ b/dom/webidl/DOMTokenList.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#interface-domtokenlist
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface DOMTokenList {
+  [Pure]
+  readonly attribute unsigned long length;
+  [Pure]
+  getter DOMString? item(unsigned long index);
+  [Pure]
+  boolean contains(DOMString token);
+  [CEReactions, Throws]
+  undefined add(DOMString... tokens);
+  [CEReactions, Throws]
+  undefined remove(DOMString... tokens);
+  [CEReactions, Throws]
+  boolean replace(DOMString token, DOMString newToken);
+  [CEReactions, Throws]
+  boolean toggle(DOMString token, optional boolean force);
+  [Throws]
+  boolean supports(DOMString token);
+  [CEReactions, SetterThrows, Pure]
+  stringifier attribute DOMString value;
+  iterable<DOMString?>;
+};
diff --git a/dom/webidl/DataTransfer.webidl b/dom/webidl/DataTransfer.webidl
new file mode 100644
index 0000000000..f1e70ad9bd
--- /dev/null
+++ b/dom/webidl/DataTransfer.webidl
@@ -0,0 +1,192 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-datatransfer-interface
+ */
+interface ContentSecurityPolicy;
+
+[Exposed=Window]
+interface DataTransfer {
+  constructor();
+
+           attribute DOMString dropEffect;
+           attribute DOMString effectAllowed;
+
+  readonly attribute DataTransferItemList items;
+
+  undefined setDragImage(Element image, long x, long y);
+
+  // ReturnValueNeedsContainsHack on .types because lots of extension
+  // code was expecting .contains() back when it was a DOMStringList.
+  [Pure, Cached, Frozen, NeedsCallerType, ReturnValueNeedsContainsHack]
+  readonly attribute sequence<DOMString> types;
+  [Throws, NeedsSubjectPrincipal]
+  DOMString getData(DOMString format);
+  [Throws, NeedsSubjectPrincipal]
+  undefined setData(DOMString format, DOMString data);
+  [Throws, NeedsSubjectPrincipal]
+  undefined clearData(optional DOMString format);
+  [NeedsSubjectPrincipal]
+  readonly attribute FileList? files;
+};
+
+// Mozilla specific stuff
+partial interface DataTransfer {
+  /*
+   * Set the drag source. Usually you would not change this, but it will
+   * affect which node the drag and dragend events are fired at. The
+   * default target is the node that was dragged.
+   *
+   * @param element drag source to use
+   * @throws NO_MODIFICATION_ALLOWED_ERR if the item cannot be modified
+   */
+  [Throws, UseCounter]
+  undefined addElement(Element element);
+
+  /**
+   * The number of items being dragged.
+   */
+  [ChromeOnly]
+  readonly attribute unsigned long mozItemCount;
+
+  /**
+   * Sets the drag cursor state. Primarily used to control the cursor during
+   * tab drags, but could be expanded to other uses. XXX Currently implemented
+   * on Win32 only.
+   *
+   * Possible values:
+   *  auto - use default system behavior.
+   *  default - set the cursor to an arrow during the drag operation.
+   *
+   * Values other than 'default' are indentical to setting mozCursor to
+   * 'auto'.
+   */
+  [UseCounter]
+  attribute DOMString mozCursor;
+
+  /**
+   * Holds a list of the format types of the data that is stored for an item
+   * at the specified index. If the index is not in the range from 0 to
+   * itemCount - 1, an empty string list is returned.
+   */
+  [Throws, ChromeOnly]
+  DOMStringList mozTypesAt(unsigned long index);
+
+  /**
+   * Remove the data associated with the given format for an item at the
+   * specified index. The index is in the range from zero to itemCount - 1.
+   *
+   * If the last format for the item is removed, the entire item is removed,
+   * reducing the itemCount by one.
+   *
+   * If format is empty, then the data associated with all formats is removed.
+   * If the format is not found, then this method has no effect.
+   *
+   * @param format the format to remove
+   * @throws NS_ERROR_DOM_INDEX_SIZE_ERR if index is greater or equal than itemCount
+   * @throws NO_MODIFICATION_ALLOWED_ERR if the item cannot be modified
+   */
+  [Throws, ChromeOnly]
+  undefined mozClearDataAt(DOMString format, unsigned long index);
+
+  /*
+   * A data transfer may store multiple items, each at a given zero-based
+   * index. setDataAt may only be called with an index argument less than
+   * itemCount in which case an existing item is modified, or equal to
+   * itemCount in which case a new item is added, and the itemCount is
+   * incremented by one.
+   *
+   * Data should be added in order of preference, with the most specific
+   * format added first and the least specific format added last. If data of
+   * the given format already exists, it is replaced in the same position as
+   * the old data.
+   *
+   * The data should be either a string, a primitive boolean or number type
+   * (which will be converted into a string) or an nsISupports.
+   *
+   * @param format the format to add
+   * @param data the data to add
+   * @throws NS_ERROR_NULL_POINTER if the data is null
+   * @throws NS_ERROR_DOM_INDEX_SIZE_ERR if index is greater than itemCount
+   * @throws NO_MODIFICATION_ALLOWED_ERR if the item cannot be modified
+   */
+  [Throws, ChromeOnly]
+  undefined mozSetDataAt(DOMString format, any data, unsigned long index);
+
+  /**
+   * Retrieve the data associated with the given format for an item at the
+   * specified index, or null if it does not exist. The index should be in the
+   * range from zero to itemCount - 1.
+   *
+   * @param format the format of the data to look up
+   * @returns the data of the given format, or null if it doesn't exist.
+   * @throws NS_ERROR_DOM_INDEX_SIZE_ERR if index is greater or equal than itemCount
+   */
+  [Throws, ChromeOnly]
+  any mozGetDataAt(DOMString format, unsigned long index);
+
+  /**
+   * Update the drag image. Arguments are the same as setDragImage. This is only
+   * valid within the parent chrome process.
+   */
+  [ChromeOnly]
+  undefined updateDragImage(Element image, long x, long y);
+
+  /**
+   * Will be true when the user has cancelled the drag (typically by pressing
+   * Escape) and when the drag has been cancelled unexpectedly.  This will be
+   * false otherwise, including when the drop has been rejected by its target.
+   * This property is only relevant for the dragend event.
+   */
+  [UseCounter]
+  readonly attribute boolean mozUserCancelled;
+
+  /**
+   * The node that the mouse was pressed over to begin the drag. For external
+   * drags, or if the caller cannot access this node, this will be null.
+   */
+  [UseCounter]
+  readonly attribute Node? mozSourceNode;
+
+  /**
+   * The top-level window context that mouse was pressed over to begin the drag.
+   * For external drags, this will be null.
+   */
+  [ChromeOnly]
+  readonly attribute WindowContext? sourceTopWindowContext;
+
+  /**
+   * The URI spec of the triggering principal.  This may be different than
+   * sourceNode's principal when sourceNode is xul:browser and the drag is
+   * triggered in a browsing context inside it.
+   */
+  [ChromeOnly]
+  readonly attribute DOMString mozTriggeringPrincipalURISpec;
+
+  [ChromeOnly]
+  readonly attribute ContentSecurityPolicy? mozCSP;
+
+  /**
+   * Copy the given DataTransfer for the given event. Used by testing code for
+   * creating emulated Drag and Drop events in the UI.
+   *
+   * NOTE: Don't expose a DataTransfer produced with this method to the web or
+   * use this for non-testing purposes. It can easily be used to get the
+   * DataTransfer into an invalid state, and is an unstable implementation
+   * detail of EventUtils.synthesizeDrag.
+   */
+  [Throws, ChromeOnly]
+  DataTransfer mozCloneForEvent(DOMString event);
+
+  /**
+   * Whether to show the "fail" animation that returns a dragged item
+   * to its source. Only works on macOS, and has to be set early in the drag
+   * on that platform.
+   * Defaults to true.
+   */
+  [ChromeOnly]
+  attribute boolean mozShowFailAnimation;
+};
diff --git a/dom/webidl/DataTransferItem.webidl b/dom/webidl/DataTransferItem.webidl
new file mode 100644
index 0000000000..1e7bb2ee58
--- /dev/null
+++ b/dom/webidl/DataTransferItem.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * https://html.spec.whatwg.org/multipage/interaction.html#the-datatransferitem-interface
+ * https://wicg.github.io/entries-api/#idl-index
+ */
+
+[Exposed=Window]
+interface DataTransferItem {
+  readonly attribute DOMString kind;
+  readonly attribute DOMString type;
+  [Throws, NeedsSubjectPrincipal]
+  undefined getAsString(FunctionStringCallback? callback);
+  [Throws, NeedsSubjectPrincipal]
+  File? getAsFile();
+};
+
+callback FunctionStringCallback = undefined (DOMString data);
+
+// https://wicg.github.io/entries-api/#idl-index
+partial interface DataTransferItem {
+  [Pref="dom.webkitBlink.filesystem.enabled", BinaryName="getAsEntry", Throws,
+   NeedsSubjectPrincipal]
+  FileSystemEntry? webkitGetAsEntry();
+};
diff --git a/dom/webidl/DataTransferItemList.webidl b/dom/webidl/DataTransferItemList.webidl
new file mode 100644
index 0000000000..fbcdd9d322
--- /dev/null
+++ b/dom/webidl/DataTransferItemList.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * https://html.spec.whatwg.org/multipage/interaction.html#the-datatransferitemlist-interface
+ */
+
+[Exposed=Window]
+interface DataTransferItemList {
+  readonly attribute unsigned long length;
+  getter DataTransferItem (unsigned long index);
+  [Throws, NeedsSubjectPrincipal]
+  DataTransferItem? add(DOMString data, DOMString type);
+  [Throws, NeedsSubjectPrincipal]
+  DataTransferItem? add(File data);
+  [Throws, NeedsSubjectPrincipal]
+  undefined remove(unsigned long index);
+  [Throws, NeedsSubjectPrincipal]
+  undefined clear();
+};
diff --git a/dom/webidl/DecoderDoctorNotification.webidl b/dom/webidl/DecoderDoctorNotification.webidl
new file mode 100644
index 0000000000..6c6ad6835e
--- /dev/null
+++ b/dom/webidl/DecoderDoctorNotification.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum DecoderDoctorNotificationType {
+  "cannot-play",
+  "platform-decoder-not-found",
+  "can-play-but-some-missing-decoders",
+  "cannot-initialize-pulseaudio",
+  "unsupported-libavcodec",
+  "decode-error",
+  "decode-warning",
+};
+
+enum DecoderDoctorReportType {
+  "mediawidevinenowmf",
+  "mediawmfneeded",
+  "mediaplatformdecodernotfound",
+  "mediacannotplaynodecoders",
+  "medianodecoders",
+  "mediacannotinitializepulseaudio",
+  "mediaunsupportedlibavcodec",
+  "mediadecodeerror",
+  "mediadecodewarning",
+};
+
+[GenerateToJSON]
+dictionary DecoderDoctorNotification {
+  required DecoderDoctorNotificationType type;
+  // True when the issue has been solved.
+  required boolean isSolved;
+  // Key from dom.properties, used for telemetry and prefs.
+  required DOMString decoderDoctorReportId;
+  // If provided, formats (or key systems) at issue.
+  DOMString formats;
+  // If provided, technical details about the decode-error/warning.
+  DOMString decodeIssue;
+  // If provided, URL of the document where the issue happened.
+  DOMString docURL;
+  // If provided, URL of the media resource that caused a decode-error/warning.
+  DOMString resourceURL;
+};
diff --git a/dom/webidl/DecompressionStream.webidl b/dom/webidl/DecompressionStream.webidl
new file mode 100644
index 0000000000..120c16b1aa
--- /dev/null
+++ b/dom/webidl/DecompressionStream.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://wicg.github.io/compression/#decompression-stream
+ */
+
+[Exposed=*, Pref="dom.compression_streams.enabled"]
+interface DecompressionStream {
+  [Throws]
+  constructor(CompressionFormat format);
+};
+DecompressionStream includes GenericTransformStream;
diff --git a/dom/webidl/DedicatedWorkerGlobalScope.webidl b/dom/webidl/DedicatedWorkerGlobalScope.webidl
new file mode 100644
index 0000000000..e32e23c0cd
--- /dev/null
+++ b/dom/webidl/DedicatedWorkerGlobalScope.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/workers.html#the-workerglobalscope-common-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Global=(Worker,DedicatedWorker),
+ Exposed=DedicatedWorker]
+interface DedicatedWorkerGlobalScope : WorkerGlobalScope {
+  [Replaceable]
+  readonly attribute DOMString name;
+
+  [Throws]
+  undefined postMessage(any message, sequence<object> transfer);
+  [Throws]
+  undefined postMessage(any message, optional StructuredSerializeOptions options = {});
+
+  undefined close();
+
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+
+  // https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#animation-frames
+  // Ideally we would just include AnimationFrameProvider to add the interface,
+  // but we cannot make an include conditional.
+  [Pref="dom.workers.requestAnimationFrame", Throws]
+  long requestAnimationFrame(FrameRequestCallback callback);
+
+  [Pref="dom.workers.requestAnimationFrame", Throws]
+  undefined cancelAnimationFrame(long handle);
+};
diff --git a/dom/webidl/DelayNode.webidl b/dom/webidl/DelayNode.webidl
new file mode 100644
index 0000000000..16e973f92f
--- /dev/null
+++ b/dom/webidl/DelayNode.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary DelayOptions : AudioNodeOptions {
+             double maxDelayTime = 1;
+             double delayTime = 0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface DelayNode : AudioNode {
+    [Throws]
+    constructor(BaseAudioContext context, optional DelayOptions options = {});
+
+    readonly attribute AudioParam delayTime;
+
+};
+
+// Mozilla extension
+DelayNode includes AudioNodePassThrough;
diff --git a/dom/webidl/DeviceLightEvent.webidl b/dom/webidl/DeviceLightEvent.webidl
new file mode 100644
index 0000000000..6d0c86718f
--- /dev/null
+++ b/dom/webidl/DeviceLightEvent.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="device.sensors.ambientLight.enabled", Func="nsGlobalWindowInner::DeviceSensorsEnabled",
+ Exposed=Window]
+interface DeviceLightEvent : Event
+{
+  constructor(DOMString type, optional DeviceLightEventInit eventInitDict = {});
+
+  readonly attribute unrestricted double value;
+};
+
+dictionary DeviceLightEventInit : EventInit
+{
+  unrestricted double value = Infinity;
+};
diff --git a/dom/webidl/DeviceMotionEvent.webidl b/dom/webidl/DeviceMotionEvent.webidl
new file mode 100644
index 0000000000..4d8ae105c7
--- /dev/null
+++ b/dom/webidl/DeviceMotionEvent.webidl
@@ -0,0 +1,68 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://w3c.github.io/deviceorientation/
+ */
+
+[LegacyNoInterfaceObject,
+  Exposed=Window]
+interface DeviceAcceleration {
+  readonly attribute double? x;
+  readonly attribute double? y;
+  readonly attribute double? z;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface DeviceRotationRate {
+  readonly attribute double? alpha;
+  readonly attribute double? beta;
+  readonly attribute double? gamma;
+};
+
+[Pref="device.sensors.motion.enabled", Func="nsGlobalWindowInner::DeviceSensorsEnabled",
+ Exposed=Window]
+interface DeviceMotionEvent : Event {
+  constructor(DOMString type,
+              optional DeviceMotionEventInit eventInitDict = {});
+
+  readonly attribute DeviceAcceleration? acceleration;
+  readonly attribute DeviceAcceleration? accelerationIncludingGravity;
+  readonly attribute DeviceRotationRate? rotationRate;
+  readonly attribute double? interval;
+};
+
+dictionary DeviceAccelerationInit {
+  double? x = null;
+  double? y = null;
+  double? z = null;
+};
+
+dictionary DeviceRotationRateInit {
+  double? alpha = null;
+  double? beta = null;
+  double? gamma = null;
+};
+
+dictionary DeviceMotionEventInit : EventInit {
+  // FIXME: bug 1493860: should this "= {}" be here?
+  DeviceAccelerationInit acceleration = {};
+  // FIXME: bug 1493860: should this "= {}" be here?
+  DeviceAccelerationInit accelerationIncludingGravity = {};
+  // FIXME: bug 1493860: should this "= {}" be here?
+  DeviceRotationRateInit rotationRate = {};
+  double? interval = null;
+};
+
+// Mozilla extensions.
+partial interface DeviceMotionEvent {
+  undefined initDeviceMotionEvent(DOMString type,
+                                  optional boolean canBubble = false,
+                                  optional boolean cancelable = false,
+                                  optional DeviceAccelerationInit acceleration = {},
+                                  optional DeviceAccelerationInit accelerationIncludingGravity = {},
+                                  optional DeviceRotationRateInit rotationRate = {},
+                                  optional double? interval = null);
+};
diff --git a/dom/webidl/DeviceOrientationEvent.webidl b/dom/webidl/DeviceOrientationEvent.webidl
new file mode 100644
index 0000000000..6d2e44f0be
--- /dev/null
+++ b/dom/webidl/DeviceOrientationEvent.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="device.sensors.orientation.enabled", Func="nsGlobalWindowInner::DeviceSensorsEnabled", LegacyEventInit,
+ Exposed=Window]
+interface DeviceOrientationEvent : Event
+{
+  constructor(DOMString type,
+              optional DeviceOrientationEventInit eventInitDict = {});
+
+  readonly attribute double? alpha;
+  readonly attribute double? beta;
+  readonly attribute double? gamma;
+  readonly attribute boolean absolute;
+
+  // initDeviceOrientationEvent is a Gecko specific deprecated method.
+  undefined initDeviceOrientationEvent(DOMString type,
+                                       optional boolean canBubble = false,
+                                       optional boolean cancelable = false,
+                                       optional double? alpha = null,
+                                       optional double? beta = null,
+                                       optional double? gamma = null,
+                                       optional boolean absolute = false);
+};
+
+dictionary DeviceOrientationEventInit : EventInit
+{
+  double? alpha = null;
+  double? beta = null;
+  double? gamma = null;
+  boolean absolute = false;
+};
diff --git a/dom/webidl/Directory.webidl b/dom/webidl/Directory.webidl
new file mode 100644
index 0000000000..c76a1ab098
--- /dev/null
+++ b/dom/webidl/Directory.webidl
@@ -0,0 +1,55 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * All functions on Directory that accept DOMString arguments for file or
+ * directory names only allow relative path to current directory itself. The
+ * path should be a descendent path like "path/to/file.txt" and not contain a
+ * segment of ".." or ".". So the paths aren't allowed to walk up the directory
+ * tree. For example, paths like "../foo", "..", "/foo/bar" or "foo/../bar" are
+ * not allowed.
+ *
+ * http://w3c.github.io/filesystem-api/#idl-def-Directory
+ * https://microsoftedge.github.io/directory-upload/proposal.html#directory-interface
+ */
+
+[Exposed=(Window,Worker)]
+interface Directory {
+  // This ChromeOnly constructor is used by the MockFilePicker for testing only.
+  [Throws, ChromeOnly]
+  constructor(DOMString path);
+
+  /*
+   * The leaf name of the directory.
+   */
+  [Throws]
+  readonly attribute DOMString name;
+};
+
+[Exposed=(Window,Worker)]
+partial interface Directory {
+  // Already defined in the main interface declaration:
+  //readonly attribute DOMString name;
+
+  /*
+   * The path of the Directory (includes both its basename and leafname).
+   * The path begins with the name of the ancestor Directory that was
+   * originally exposed to content (say via a directory picker) and traversed
+   * to obtain this Directory.  Full filesystem paths are not exposed to
+   * unprivilaged content.
+   */
+  [Throws]
+  readonly attribute DOMString path;
+
+  /*
+   * Getter for the immediate children of this directory.
+   */
+  [NewObject]
+  Promise<sequence<(File or Directory)>> getFilesAndDirectories();
+
+  [NewObject]
+  Promise<sequence<File>> getFiles(optional boolean recursiveFlag = false);
+};
diff --git a/dom/webidl/Document.webidl b/dom/webidl/Document.webidl
new file mode 100644
index 0000000000..5b1f4baec3
--- /dev/null
+++ b/dom/webidl/Document.webidl
@@ -0,0 +1,735 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://dom.spec.whatwg.org/#interface-document
+ * https://html.spec.whatwg.org/multipage/dom.html#the-document-object
+ * https://html.spec.whatwg.org/multipage/obsolete.html#other-elements%2C-attributes-and-apis
+ * https://fullscreen.spec.whatwg.org/#api
+ * https://w3c.github.io/pointerlock/#extensions-to-the-document-interface
+ * https://w3c.github.io/pointerlock/#extensions-to-the-documentorshadowroot-mixin
+ * https://w3c.github.io/page-visibility/#extensions-to-the-document-interface
+ * https://drafts.csswg.org/cssom/#extensions-to-the-document-interface
+ * https://drafts.csswg.org/cssom-view/#extensions-to-the-document-interface
+ * https://wicg.github.io/feature-policy/#policy
+ */
+
+interface ContentSecurityPolicy;
+interface Principal;
+interface WindowProxy;
+interface nsISupports;
+interface URI;
+interface nsIDocShell;
+interface nsILoadGroup;
+interface nsIReferrerInfo;
+interface nsICookieJarSettings;
+interface nsIPermissionDelegateHandler;
+interface XULCommandDispatcher;
+
+enum VisibilityState { "hidden", "visible" };
+
+/* https://dom.spec.whatwg.org/#dictdef-elementcreationoptions */
+dictionary ElementCreationOptions {
+  DOMString is;
+
+  [ChromeOnly]
+  DOMString pseudo;
+};
+
+/* https://dom.spec.whatwg.org/#interface-document */
+[Exposed=Window]
+interface Document : Node {
+  [Throws]
+  constructor();
+
+  [Throws]
+  readonly attribute DOMImplementation implementation;
+  [Pure, Throws, BinaryName="documentURIFromJS", NeedsCallerType]
+  readonly attribute DOMString URL;
+  [Pure, Throws, BinaryName="documentURIFromJS", NeedsCallerType]
+  readonly attribute DOMString documentURI;
+  [Pure]
+  readonly attribute DOMString compatMode;
+  [Pure]
+  readonly attribute DOMString characterSet;
+  [Pure,BinaryName="characterSet"]
+  readonly attribute DOMString charset; // legacy alias of .characterSet
+  [Pure,BinaryName="characterSet"]
+  readonly attribute DOMString inputEncoding; // legacy alias of .characterSet
+  [Pure]
+  readonly attribute DOMString contentType;
+
+  [Pure]
+  readonly attribute DocumentType? doctype;
+  [Pure]
+  readonly attribute Element? documentElement;
+  [Pure]
+  HTMLCollection getElementsByTagName(DOMString localName);
+  [Pure, Throws]
+  HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  HTMLCollection getElementsByClassName(DOMString classNames);
+  [Pure]
+  Element? getElementById(DOMString elementId);
+
+  // These DOM methods cannot be accessed by UA Widget scripts
+  // because the DOM element reflectors will be in the content scope,
+  // instead of the desired UA Widget scope.
+  [CEReactions, NewObject, Throws, Func="IsNotUAWidget"]
+  Element createElement(DOMString localName, optional (ElementCreationOptions or DOMString) options = {});
+  [CEReactions, NewObject, Throws, Func="IsNotUAWidget"]
+  Element createElementNS(DOMString? namespace, DOMString qualifiedName, optional (ElementCreationOptions or DOMString) options = {});
+  [NewObject]
+  DocumentFragment createDocumentFragment();
+  [NewObject, Func="IsNotUAWidget"]
+  Text createTextNode(DOMString data);
+  [NewObject, Func="IsNotUAWidget"]
+  Comment createComment(DOMString data);
+  [NewObject, Throws]
+  ProcessingInstruction createProcessingInstruction(DOMString target, DOMString data);
+
+  [CEReactions, Throws, Func="IsNotUAWidget"]
+  Node importNode(Node node, optional boolean deep = false);
+  [CEReactions, Throws, Func="IsNotUAWidget"]
+  Node adoptNode(Node node);
+
+  [NewObject, Throws, NeedsCallerType]
+  Event createEvent(DOMString interface);
+
+  [NewObject, Throws]
+  Range createRange();
+
+  // NodeFilter.SHOW_ALL = 0xFFFFFFFF
+  [NewObject, Throws]
+  NodeIterator createNodeIterator(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
+  [NewObject, Throws]
+  TreeWalker createTreeWalker(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
+
+  // NEW
+  // No support for prepend/append yet
+  // undefined prepend((Node or DOMString)... nodes);
+  // undefined append((Node or DOMString)... nodes);
+
+  // These are not in the spec, but leave them for now for backwards compat.
+  // So sort of like Gecko extensions
+  [NewObject, Throws]
+  CDATASection createCDATASection(DOMString data);
+  [NewObject, Throws]
+  Attr createAttribute(DOMString name);
+  [NewObject, Throws]
+  Attr createAttributeNS(DOMString? namespace, DOMString name);
+};
+
+// https://html.spec.whatwg.org/multipage/dom.html#the-document-object
+partial interface Document {
+  [PutForwards=href, LegacyUnforgeable] readonly attribute Location? location;
+  [SetterThrows]                           attribute DOMString domain;
+  readonly attribute DOMString referrer;
+  [Throws] attribute DOMString cookie;
+  readonly attribute DOMString lastModified;
+  readonly attribute DOMString readyState;
+
+  // DOM tree accessors
+  //(Not proxy yet)getter object (DOMString name);
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString title;
+  [CEReactions, Pure]
+           attribute DOMString dir;
+  [CEReactions, Pure, SetterThrows]
+           attribute HTMLElement? body;
+  [Pure]
+  readonly attribute HTMLHeadElement? head;
+  [SameObject] readonly attribute HTMLCollection images;
+  [SameObject] readonly attribute HTMLCollection embeds;
+  [SameObject] readonly attribute HTMLCollection plugins;
+  [SameObject] readonly attribute HTMLCollection links;
+  [SameObject] readonly attribute HTMLCollection forms;
+  [SameObject] readonly attribute HTMLCollection scripts;
+  [Pure]
+  NodeList getElementsByName(DOMString elementName);
+  //(Not implemented)readonly attribute DOMElementMap cssElementMap;
+
+  // dynamic markup insertion
+  [CEReactions, Throws]
+  Document open(optional DOMString unused1, optional DOMString unused2); // both arguments are ignored
+  [CEReactions, Throws]
+  WindowProxy? open(USVString url, DOMString name, DOMString features);
+  [CEReactions, Throws]
+  undefined close();
+  [CEReactions, Throws]
+  undefined write(DOMString... text);
+  [CEReactions, Throws]
+  undefined writeln(DOMString... text);
+
+  // user interaction
+  [Pure]
+  readonly attribute WindowProxy? defaultView;
+  [Throws]
+  boolean hasFocus();
+  [CEReactions, SetterThrows, SetterNeedsSubjectPrincipal]
+           attribute DOMString designMode;
+  [CEReactions, Throws, NeedsSubjectPrincipal]
+  boolean execCommand(DOMString commandId, optional boolean showUI = false,
+                      optional DOMString value = "");
+  [Throws, NeedsSubjectPrincipal]
+  boolean queryCommandEnabled(DOMString commandId);
+  [Throws]
+  boolean queryCommandIndeterm(DOMString commandId);
+  [Throws]
+  boolean queryCommandState(DOMString commandId);
+  [Throws, NeedsCallerType]
+  boolean queryCommandSupported(DOMString commandId);
+  [Throws]
+  DOMString queryCommandValue(DOMString commandId);
+  //(Not implemented)readonly attribute HTMLCollection commands;
+
+  // special event handler IDL attributes that only apply to Document objects
+  [LegacyLenientThis] attribute EventHandler onreadystatechange;
+
+  // Gecko extensions?
+                attribute EventHandler onbeforescriptexecute;
+                attribute EventHandler onafterscriptexecute;
+
+  /**
+   * True if this document is synthetic : stand alone image, video, audio file,
+   * etc.
+   */
+  [Func="IsChromeOrUAWidget"] readonly attribute boolean mozSyntheticDocument;
+  /**
+   * Returns the script element whose script is currently being processed.
+   *
+   * @see <https://developer.mozilla.org/en/DOM/document.currentScript>
+   */
+  [Pure]
+  readonly attribute Element? currentScript;
+  /**
+   * Release the current mouse capture if it is on an element within this
+   * document.
+   *
+   * @see <https://developer.mozilla.org/en/DOM/document.releaseCapture>
+   */
+  [Deprecated=DocumentReleaseCapture, Pref="dom.mouse_capture.enabled"]
+  undefined releaseCapture();
+  /**
+   * Use the given DOM element as the source image of target |-moz-element()|.
+   *
+   * This function introduces a new special ID (called "image element ID"),
+   * which is only used by |-moz-element()|, and associates it with the given
+   * DOM element.  Image elements ID's have the higher precedence than general
+   * HTML id's, so if |document.mozSetImageElement(<id>, <element>)| is called,
+   * |-moz-element(#<id>)| uses |<element>| as the source image even if there
+   * is another element with id attribute = |<id>|.  To unregister an image
+   * element ID |<id>|, call |document.mozSetImageElement(<id>, null)|.
+   *
+   * Example:
+   * <script>
+   *   canvas = document.createElement("canvas");
+   *   canvas.setAttribute("width", 100);
+   *   canvas.setAttribute("height", 100);
+   *   // draw to canvas
+   *   document.mozSetImageElement("canvasbg", canvas);
+   * </script>
+   * <div style="background-image: -moz-element(#canvasbg);"></div>
+   *
+   * @param aImageElementId an image element ID to associate with
+   * |aImageElement|
+   * @param aImageElement a DOM element to be used as the source image of
+   * |-moz-element(#aImageElementId)|. If this is null, the function will
+   * unregister the image element ID |aImageElementId|.
+   *
+   * @see <https://developer.mozilla.org/en/DOM/document.mozSetImageElement>
+   */
+  [UseCounter]
+  undefined mozSetImageElement(DOMString aImageElementId,
+                               Element? aImageElement);
+
+  [ChromeOnly]
+  readonly attribute URI? documentURIObject;
+
+  /**
+   * Current referrer policy - one of the referrer policy value from
+   * ReferrerPolicy.webidl.
+   */
+  [ChromeOnly]
+  readonly attribute ReferrerPolicy referrerPolicy;
+
+    /**
+   * Current referrer info, which holds all referrer related information
+   * including referrer policy and raw referrer of document.
+   */
+  [ChromeOnly]
+  readonly attribute nsIReferrerInfo referrerInfo;
+
+};
+
+// https://html.spec.whatwg.org/multipage/obsolete.html#other-elements%2C-attributes-and-apis
+partial interface Document {
+  [CEReactions] attribute [LegacyNullToEmptyString] DOMString fgColor;
+  [CEReactions] attribute [LegacyNullToEmptyString] DOMString linkColor;
+  [CEReactions] attribute [LegacyNullToEmptyString] DOMString vlinkColor;
+  [CEReactions] attribute [LegacyNullToEmptyString] DOMString alinkColor;
+  [CEReactions] attribute [LegacyNullToEmptyString] DOMString bgColor;
+
+  [SameObject] readonly attribute HTMLCollection anchors;
+  [SameObject] readonly attribute HTMLCollection applets;
+
+  undefined clear();
+  // @deprecated These are old Netscape 4 methods. Do not use,
+  //             the implementation is no-op.
+  // XXXbz do we actually need these anymore?
+  undefined captureEvents();
+  undefined releaseEvents();
+
+  [SameObject] readonly attribute HTMLAllCollection all;
+};
+
+// https://fullscreen.spec.whatwg.org/#api
+partial interface Document {
+  // Note: Per spec the 'S' in these two is lowercase, but the "Moz"
+  // versions have it uppercase.
+  [LegacyLenientSetter, Unscopable]
+  readonly attribute boolean fullscreen;
+  [BinaryName="fullscreen"]
+  readonly attribute boolean mozFullScreen;
+  [LegacyLenientSetter, NeedsCallerType]
+  readonly attribute boolean fullscreenEnabled;
+  [BinaryName="fullscreenEnabled", NeedsCallerType]
+  readonly attribute boolean mozFullScreenEnabled;
+
+  [NewObject]
+  Promise<undefined> exitFullscreen();
+  [NewObject, BinaryName="exitFullscreen"]
+  Promise<undefined> mozCancelFullScreen();
+
+  // Events handlers
+  attribute EventHandler onfullscreenchange;
+  attribute EventHandler onfullscreenerror;
+};
+
+// https://w3c.github.io/pointerlock/#extensions-to-the-document-interface
+// https://w3c.github.io/pointerlock/#extensions-to-the-documentorshadowroot-mixin
+partial interface Document {
+  undefined exitPointerLock();
+
+  // Event handlers
+  attribute EventHandler onpointerlockchange;
+  attribute EventHandler onpointerlockerror;
+};
+
+// Mozilla-internal document extensions specific to error pages.
+partial interface Document {
+  [Func="Document::CallerIsTrustedAboutCertError", NewObject]
+  Promise<any> addCertException(boolean isTemporary);
+
+  [Func="Document::CallerIsTrustedAboutHttpsOnlyError"]
+  undefined reloadWithHttpsOnlyException();
+
+  [Func="Document::CallerIsTrustedAboutCertError", Throws]
+  FailedCertSecurityInfo getFailedCertSecurityInfo();
+
+  [Func="Document::CallerIsTrustedAboutNetError", Throws]
+  NetErrorInfo getNetErrorInfo();
+};
+
+// https://w3c.github.io/page-visibility/#extensions-to-the-document-interface
+partial interface Document {
+  readonly attribute boolean hidden;
+  readonly attribute VisibilityState visibilityState;
+           attribute EventHandler onvisibilitychange;
+};
+
+// https://drafts.csswg.org/cssom/#extensions-to-the-document-interface
+partial interface Document {
+    attribute DOMString? selectedStyleSheetSet;
+    readonly attribute DOMString? lastStyleSheetSet;
+    readonly attribute DOMString? preferredStyleSheetSet;
+    [Constant]
+    readonly attribute DOMStringList styleSheetSets;
+    undefined enableStyleSheetsForSet (DOMString? name);
+};
+
+// https://drafts.csswg.org/cssom-view/#extensions-to-the-document-interface
+partial interface Document {
+    CaretPosition? caretPositionFromPoint (float x, float y);
+
+    readonly attribute Element? scrollingElement;
+};
+
+// http://dev.w3.org/2006/webapi/selectors-api2/#interface-definitions
+partial interface Document {
+  [Throws, Pure]
+  Element?  querySelector(UTF8String selectors);
+  [Throws, Pure]
+  NodeList  querySelectorAll(UTF8String selectors);
+
+  //(Not implemented)Element?  find(DOMString selectors, optional (Element or sequence<Node>)? refNodes);
+  //(Not implemented)NodeList  findAll(DOMString selectors, optional (Element or sequence<Node>)? refNodes);
+};
+
+// https://drafts.csswg.org/web-animations/#extensions-to-the-document-interface
+partial interface Document {
+  [Func="Document::AreWebAnimationsTimelinesEnabled"]
+  readonly attribute DocumentTimeline timeline;
+};
+
+// https://svgwg.org/svg2-draft/struct.html#InterfaceDocumentExtensions
+partial interface Document {
+  [BinaryName="SVGRootElement"]
+  readonly attribute SVGSVGElement? rootElement;
+};
+
+//  Mozilla extensions of various sorts
+partial interface Document {
+  // Creates a new XUL element regardless of the document's default type.
+  [ChromeOnly, CEReactions, NewObject, Throws]
+  Element createXULElement(DOMString localName, optional (ElementCreationOptions or DOMString) options = {});
+  // Wether the document was loaded using a nsXULPrototypeDocument.
+  [ChromeOnly]
+  readonly attribute boolean loadedFromPrototype;
+
+  // The principal to use for the storage area of this document
+  [ChromeOnly]
+  readonly attribute Principal effectiveStoragePrincipal;
+
+  // You should probably not be using this principal getter since it performs
+  // no checks to ensure that the partitioned principal should really be used
+  // here.  It is only designed to be used in very specific circumstances, such
+  // as when inheriting the document/storage principal.
+  [ChromeOnly]
+  readonly attribute Principal partitionedPrincipal;
+
+  // The cookieJarSettings of this document
+  [ChromeOnly]
+  readonly attribute nsICookieJarSettings cookieJarSettings;
+
+  // Touch bits
+  // XXXbz I can't find the sane spec for this stuff, so just cribbing
+  // from our xpidl for now.
+  [NewObject, Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  Touch createTouch(optional Window? view = null,
+                    optional EventTarget? target = null,
+                    optional long identifier = 0,
+                    optional long pageX = 0,
+                    optional long pageY = 0,
+                    optional long screenX = 0,
+                    optional long screenY = 0,
+                    optional long clientX = 0,
+                    optional long clientY = 0,
+                    optional long radiusX = 0,
+                    optional long radiusY = 0,
+                    optional float rotationAngle = 0,
+                    optional float force = 0);
+  // XXXbz a hack to get around the fact that we don't support variadics as
+  // distinguishing arguments yet.  Once this hack is removed. we can also
+  // remove the corresponding overload on Document, since Touch... and
+  // sequence<Touch> look the same in the C++.
+  [NewObject, Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  TouchList createTouchList(Touch touch, Touch... touches);
+  // XXXbz and another hack for the fact that we can't usefully have optional
+  // distinguishing arguments but need a working zero-arg form of
+  // createTouchList().
+  [NewObject, Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  TouchList createTouchList();
+  [NewObject, Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+  TouchList createTouchList(sequence<Touch> touches);
+
+  [ChromeOnly]
+  attribute boolean styleSheetChangeEventsEnabled;
+
+  [ChromeOnly]
+  attribute boolean devToolsAnonymousAndShadowEventsEnabled;
+
+  [ChromeOnly] readonly attribute DOMString contentLanguage;
+
+  [ChromeOnly] readonly attribute nsILoadGroup? documentLoadGroup;
+
+  // Blocks the initial document parser until the given promise is settled.
+  [ChromeOnly, NewObject]
+  Promise<any> blockParsing(Promise<any> promise,
+                            optional BlockParsingOptions options = {});
+
+  [Func="nsContentUtils::IsSystemOrPDFJS", BinaryName="blockUnblockOnloadForSystemOrPDFJS"]
+  undefined blockUnblockOnload(boolean block);
+
+  // like documentURI, except that for error pages, it returns the URI we were
+  // trying to load when we hit an error, rather than the error page's own URI.
+  [ChromeOnly] readonly attribute URI? mozDocumentURIIfNotForErrorPages;
+
+  // A promise that is resolved when we have both fired DOMContentLoaded and
+  // are ready to start layout.
+  // This is used for the  "document_idle" webextension script injection point.
+  [ChromeOnly, Throws]
+  readonly attribute Promise<undefined> documentReadyForIdle;
+
+  // Lazily created command dispatcher, returns null if the document is not
+  // chrome privileged.
+  [ChromeOnly]
+  readonly attribute XULCommandDispatcher? commandDispatcher;
+
+  [ChromeOnly]
+  attribute boolean devToolsWatchingDOMMutations;
+
+  /**
+   * Returns all the shadow roots connected to the document, in no particular
+   * order, and without regard to open/closed-ness. Also returns UA widgets
+   * (like <video> controls), which can be checked using
+   * ShadowRoot.isUAWidget().
+   */
+  [ChromeOnly]
+  sequence<ShadowRoot> getConnectedShadowRoots();
+};
+
+dictionary BlockParsingOptions {
+  /**
+   * If true, blocks script-created parsers (created via document.open()) in
+   * addition to network-created parsers.
+   */
+  boolean blockScriptCreated = true;
+};
+
+// Extension to give chrome JS the ability to determine when a document was
+// created to satisfy an iframe with srcdoc attribute.
+partial interface Document {
+  [ChromeOnly] readonly attribute boolean isSrcdocDocument;
+};
+
+
+// Extension to give chrome JS the ability to get the underlying
+// sandbox flag attribute
+partial interface Document {
+  [ChromeOnly] readonly attribute DOMString? sandboxFlagsAsString;
+};
+
+
+/**
+ * Chrome document anonymous content management.
+ * This is a Chrome-only API that allows inserting fixed positioned anonymous
+ * content on top of the current page displayed in the document.
+ * The supplied content is cloned and inserted into the document's CanvasFrame.
+ * Note that this only works for HTML documents.
+ */
+partial interface Document {
+  /**
+   * Deep-clones the provided element and inserts it into the CanvasFrame.
+   * Returns an AnonymousContent instance that can be used to manipulate the
+   * inserted element.
+   *
+   * If aForce is true, tries to update layout to be able to insert the element
+   * synchronously.
+   */
+  [ChromeOnly, NewObject, Throws]
+  AnonymousContent insertAnonymousContent(Element aElement, optional boolean aForce = false);
+
+  /**
+   * Removes the element inserted into the CanvasFrame given an AnonymousContent
+   * instance.
+   */
+  [ChromeOnly]
+  undefined removeAnonymousContent(AnonymousContent aContent);
+};
+
+// http://w3c.github.io/selection-api/#extensions-to-document-interface
+partial interface Document {
+  [Throws]
+  Selection? getSelection();
+};
+
+// https://github.com/whatwg/html/issues/3338
+partial interface Document {
+  [Pref="dom.storage_access.enabled", NewObject]
+  Promise<boolean> hasStorageAccess();
+  [Pref="dom.storage_access.enabled", NewObject]
+  Promise<undefined> requestStorageAccess();
+  // https://github.com/privacycg/storage-access/pull/100
+  [Pref="dom.storage_access.forward_declared.enabled", NewObject]
+  Promise<undefined> requestStorageAccessUnderSite(DOMString serializedSite);
+  [Pref="dom.storage_access.forward_declared.enabled", NewObject]
+  Promise<undefined> completeStorageAccessRequestFromSite(DOMString serializedSite);
+};
+
+// A privileged API to give chrome privileged code and the content script of the
+// webcompat extension the ability to request the storage access for a given
+// third party.
+partial interface Document {
+  [Func="Document::CallerCanAccessPrivilegeSSA", NewObject]
+  Promise<undefined> requestStorageAccessForOrigin(DOMString thirdPartyOrigin, optional boolean requireUserInteraction = true);
+};
+
+// Extension to give chrome JS the ability to determine whether
+// the user has interacted with the document or not.
+partial interface Document {
+  [ChromeOnly] readonly attribute boolean userHasInteracted;
+};
+
+// Extension to give chrome JS the ability to simulate activate the document
+// by user gesture.
+partial interface Document {
+  [ChromeOnly]
+  undefined notifyUserGestureActivation();
+  // For testing only.
+  [ChromeOnly]
+  undefined clearUserGestureActivation();
+  [ChromeOnly]
+  readonly attribute boolean hasBeenUserGestureActivated;
+  [ChromeOnly]
+  readonly attribute boolean hasValidTransientUserGestureActivation;
+  [ChromeOnly]
+  readonly attribute DOMHighResTimeStamp lastUserGestureTimeStamp;
+  [ChromeOnly]
+  boolean consumeTransientUserGestureActivation();
+};
+
+// Extension to give chrome JS the ability to set an event handler which is
+// called with certain events that happened while events were suppressed in the
+// document or one of its subdocuments.
+partial interface Document {
+  [ChromeOnly]
+  undefined setSuppressedEventListener(EventListener? aListener);
+};
+
+// Allows frontend code to query a CSP which needs to be passed for a
+// new load into docshell. Further, allows to query the CSP in JSON
+// format for testing purposes.
+partial interface Document {
+  [ChromeOnly] readonly attribute ContentSecurityPolicy? csp;
+  [ChromeOnly] readonly attribute DOMString cspJSON;
+};
+
+partial interface Document {
+  [Func="Document::DocumentSupportsL10n"] readonly attribute DocumentL10n? l10n;
+  [Func="Document::DocumentSupportsL10n"] readonly attribute boolean hasPendingL10nMutations;
+};
+
+Document includes XPathEvaluatorMixin;
+Document includes GlobalEventHandlers;
+Document includes TouchEventHandlers;
+Document includes ParentNode;
+Document includes OnErrorEventHandlerForNodes;
+Document includes GeometryUtils;
+Document includes FontFaceSource;
+Document includes DocumentOrShadowRoot;
+
+// https://w3c.github.io/webappsec-feature-policy/#idl-index
+partial interface Document {
+    [SameObject, Pref="dom.security.featurePolicy.webidl.enabled"]
+    readonly attribute FeaturePolicy featurePolicy;
+};
+
+// Extension to give chrome JS the ability to specify a non-default keypress
+// event model.
+partial interface Document {
+  /**
+   * setKeyPressEventModel() is called when we need to check whether the web
+   * app requires specific keypress event model or not.
+   *
+   * @param aKeyPressEventModel  Proper keypress event model for the web app.
+   *   KEYPRESS_EVENT_MODEL_DEFAULT:
+   *     Use default keypress event model.  I.e., depending on
+   *     "dom.keyboardevent.keypress.set_keycode_and_charcode_to_same_value"
+   *     pref.
+   *   KEYPRESS_EVENT_MODEL_SPLIT:
+   *     Use split model.  I.e, if keypress event inputs a character,
+   *     keyCode should be 0.  Otherwise, charCode should be 0.
+   *   KEYPRESS_EVENT_MODEL_CONFLATED:
+   *     Use conflated model.  I.e., keyCode and charCode values of each
+   *     keypress event should be set to same value.
+   */
+  [ChromeOnly]
+  const unsigned short KEYPRESS_EVENT_MODEL_DEFAULT = 0;
+  [ChromeOnly]
+  const unsigned short KEYPRESS_EVENT_MODEL_SPLIT = 1;
+  [ChromeOnly]
+  const unsigned short KEYPRESS_EVENT_MODEL_CONFLATED = 2;
+  [ChromeOnly]
+  undefined setKeyPressEventModel(unsigned short aKeyPressEventModel);
+};
+
+// Extensions to return information about about the nodes blocked by the
+// Safebrowsing API inside a document.
+partial interface Document {
+  /*
+   * Number of nodes that have been blocked by the Safebrowsing API to prevent
+   * tracking, cryptomining and so on. This method is for testing only.
+   */
+  [ChromeOnly, Pure]
+  readonly attribute long blockedNodeByClassifierCount;
+
+  /*
+   * List of nodes that have been blocked by the Safebrowsing API to prevent
+   * tracking, fingerprinting, cryptomining and so on. This method is for
+   * testing only.
+   */
+  [ChromeOnly, Pure]
+  readonly attribute NodeList blockedNodesByClassifier;
+};
+
+// Extension to programmatically simulate a user interaction on a document,
+// used for testing.
+partial interface Document {
+  [ChromeOnly, BinaryName="setUserHasInteracted"]
+  undefined userInteractionForTesting();
+};
+
+// Extension for permission delegation.
+partial interface Document {
+  [ChromeOnly, Pure]
+  readonly attribute nsIPermissionDelegateHandler permDelegateHandler;
+};
+
+// Extension used by the password manager to infer form submissions.
+partial interface Document {
+  /*
+   * Set whether the document notifies an event when a fetch or
+   * XHR completes successfully.
+   */
+  [ChromeOnly]
+  undefined setNotifyFetchSuccess(boolean aShouldNotify);
+
+  /*
+   * Set whether a form and a password field notify an event when it is
+   * removed from the DOM tree.
+   */
+  [ChromeOnly]
+  undefined setNotifyFormOrPasswordRemoved(boolean aShouldNotify);
+};
+
+// Extension to allow chrome code to detect initial about:blank documents.
+partial interface Document {
+  [ChromeOnly]
+  readonly attribute boolean isInitialDocument;
+};
+
+// Extension to allow chrome code to get some wireframe-like structure.
+enum WireframeRectType {
+  "image",
+  "background",
+  "text",
+  "unknown",
+};
+dictionary WireframeTaggedRect {
+  unrestricted double x = 0;
+  unrestricted double y = 0;
+  unrestricted double width = 0;
+  unrestricted double height = 0;
+  unsigned long color = 0; // in nscolor format
+  WireframeRectType type;
+  Node? node;
+};
+[GenerateInit]
+dictionary Wireframe {
+  unsigned long canvasBackground = 0; // in nscolor format
+  sequence<WireframeTaggedRect> rects;
+  unsigned long version = 1; // Increment when the wireframe structure changes in backwards-incompatible ways
+};
+partial interface Document {
+  [ChromeOnly]
+  Wireframe? getWireframe(optional boolean aIncludeNodes = false);
+};
+
+partial interface Document {
+  // Returns true if the document is the current active document in a browsing
+  // context which isn't in bfcache.
+  [ChromeOnly]
+  boolean isActive();
+};
diff --git a/dom/webidl/DocumentFragment.webidl b/dom/webidl/DocumentFragment.webidl
new file mode 100644
index 0000000000..0b760abd04
--- /dev/null
+++ b/dom/webidl/DocumentFragment.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120405/#interface-documentfragment
+ * http://www.w3.org/TR/2012/WD-selectors-api-20120628/#interface-definitions
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface DocumentFragment : Node {
+  [Throws]
+  constructor();
+
+  Element? getElementById(DOMString elementId);
+};
+
+// http://www.w3.org/TR/2012/WD-selectors-api-20120628/#interface-definitions
+partial interface DocumentFragment {
+  [Throws]
+  Element?  querySelector(UTF8String selectors);
+  [Throws]
+  NodeList  querySelectorAll(UTF8String selectors);
+};
+
+DocumentFragment includes ParentNode;
diff --git a/dom/webidl/DocumentOrShadowRoot.webidl b/dom/webidl/DocumentOrShadowRoot.webidl
new file mode 100644
index 0000000000..fcc3188ff4
--- /dev/null
+++ b/dom/webidl/DocumentOrShadowRoot.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#documentorshadowroot
+ * http://w3c.github.io/webcomponents/spec/shadow/#extensions-to-the-documentorshadowroot-mixin
+ * https://wicg.github.io/construct-stylesheets/#using-constructed-stylesheets
+ */
+
+interface mixin DocumentOrShadowRoot {
+  // Not implemented yet: bug 1430308.
+  // Selection? getSelection();
+  Element? elementFromPoint(float x, float y);
+  sequence<Element> elementsFromPoint(float x, float y);
+
+  // TODO: Avoid making these ChromeOnly, see:
+  // https://github.com/w3c/csswg-drafts/issues/556
+  [ChromeOnly]
+  Node? nodeFromPoint(float x, float y);
+  [ChromeOnly]
+  sequence<Node> nodesFromPoint(float x, float y);
+
+  // Not implemented yet: bug 1430307.
+  // CaretPosition? caretPositionFromPoint (float x, float y);
+
+  readonly attribute Element? activeElement;
+  readonly attribute StyleSheetList styleSheets;
+
+  readonly attribute Element? pointerLockElement;
+  [LegacyLenientSetter]
+  readonly attribute Element? fullscreenElement;
+  [BinaryName="fullscreenElement"]
+  readonly attribute Element? mozFullScreenElement;
+};
+
+// https://drafts.csswg.org/web-animations-1/#extensions-to-the-documentorshadowroot-interface-mixin
+partial interface mixin DocumentOrShadowRoot {
+  [Func="Document::IsWebAnimationsGetAnimationsEnabled"]
+  sequence<Animation> getAnimations();
+};
+
+// https://wicg.github.io/construct-stylesheets/#using-constructed-stylesheets
+partial interface mixin DocumentOrShadowRoot {
+  // We are using [Pure, Cached, Frozen] sequence until `FrozenArray` is implemented.
+  // See https://bugzilla.mozilla.org/show_bug.cgi?id=1236777 for more details.
+  [Pref="layout.css.constructable-stylesheets.enabled"]
+  attribute ObservableArray<CSSStyleSheet> adoptedStyleSheets;
+};
diff --git a/dom/webidl/DocumentTimeline.webidl b/dom/webidl/DocumentTimeline.webidl
new file mode 100644
index 0000000000..8e757addb3
--- /dev/null
+++ b/dom/webidl/DocumentTimeline.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#documenttimeline
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary DocumentTimelineOptions {
+  DOMHighResTimeStamp originTime = 0;
+};
+
+[Func="Document::AreWebAnimationsTimelinesEnabled",
+ Exposed=Window]
+interface DocumentTimeline : AnimationTimeline {
+  [Throws]
+  constructor(optional DocumentTimelineOptions options = {});
+};
diff --git a/dom/webidl/DocumentType.webidl b/dom/webidl/DocumentType.webidl
new file mode 100644
index 0000000000..62a641e804
--- /dev/null
+++ b/dom/webidl/DocumentType.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#documenttype
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface DocumentType : Node {
+  readonly attribute DOMString name;
+  readonly attribute DOMString publicId;
+  readonly attribute DOMString systemId;
+};
+
+DocumentType includes ChildNode;
diff --git a/dom/webidl/DragEvent.webidl b/dom/webidl/DragEvent.webidl
new file mode 100644
index 0000000000..4a54f4e55e
--- /dev/null
+++ b/dom/webidl/DragEvent.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/#dragevent
+ */
+
+[Exposed=Window]
+interface DragEvent : MouseEvent
+{
+  constructor(DOMString type, optional DragEventInit eventInitDict = {});
+
+  readonly attribute DataTransfer? dataTransfer;
+
+  undefined initDragEvent(DOMString type,
+                          optional boolean canBubble = false,
+                          optional boolean cancelable = false,
+                          optional Window? aView = null,
+                          optional long aDetail = 0,
+                          optional long aScreenX = 0,
+                          optional long aScreenY = 0,
+                          optional long aClientX = 0,
+                          optional long aClientY = 0,
+                          optional boolean aCtrlKey = false,
+                          optional boolean aAltKey = false,
+                          optional boolean aShiftKey = false,
+                          optional boolean aMetaKey = false,
+                          optional unsigned short aButton = 0,
+                          optional EventTarget? aRelatedTarget = null,
+                          optional DataTransfer? aDataTransfer = null);
+};
+
+dictionary DragEventInit : MouseEventInit
+{
+  DataTransfer? dataTransfer = null;
+};
diff --git a/dom/webidl/DynamicsCompressorNode.webidl b/dom/webidl/DynamicsCompressorNode.webidl
new file mode 100644
index 0000000000..853d3402d4
--- /dev/null
+++ b/dom/webidl/DynamicsCompressorNode.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary DynamicsCompressorOptions : AudioNodeOptions {
+             float attack = 0.003;
+             float knee = 30;
+             float ratio = 12;
+             float release = 0.25;
+             float threshold = -24;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface DynamicsCompressorNode : AudioNode {
+    [Throws]
+    constructor(BaseAudioContext context,
+                optional DynamicsCompressorOptions options = {});
+
+    readonly attribute AudioParam threshold; // in Decibels
+    readonly attribute AudioParam knee; // in Decibels
+    readonly attribute AudioParam ratio; // unit-less
+    readonly attribute float reduction; // in Decibels
+    readonly attribute AudioParam attack; // in Seconds
+    [BinaryName="getRelease"]
+    readonly attribute AudioParam release; // in Seconds
+
+};
+
+// Mozilla extension
+DynamicsCompressorNode includes AudioNodePassThrough;
diff --git a/dom/webidl/Element.webidl b/dom/webidl/Element.webidl
new file mode 100644
index 0000000000..15d19010c1
--- /dev/null
+++ b/dom/webidl/Element.webidl
@@ -0,0 +1,406 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#element and
+ * http://domparsing.spec.whatwg.org/ and
+ * http://dev.w3.org/csswg/cssom-view/ and
+ * http://www.w3.org/TR/selectors-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface nsIScreen;
+
+[Exposed=Window]
+interface Element : Node {
+  [Constant]
+  readonly attribute DOMString? namespaceURI;
+  [Constant]
+  readonly attribute DOMString? prefix;
+  [Constant]
+  readonly attribute DOMString localName;
+
+  // Not [Constant] because it depends on which document we're in
+  [Pure]
+  readonly attribute DOMString tagName;
+
+  [CEReactions, Pure]
+           attribute DOMString id;
+  [CEReactions, Pure]
+           attribute DOMString className;
+  [Constant, PutForwards=value]
+  readonly attribute DOMTokenList classList;
+
+  // https://drafts.csswg.org/css-shadow-parts/#idl
+  [SameObject, PutForwards=value]
+  readonly attribute DOMTokenList part;
+
+  [SameObject]
+  readonly attribute NamedNodeMap attributes;
+  [Pure]
+  sequence<DOMString> getAttributeNames();
+  [Pure]
+  DOMString? getAttribute(DOMString name);
+  [Pure]
+  DOMString? getAttributeNS(DOMString? namespace, DOMString localName);
+  [CEReactions, NeedsSubjectPrincipal=NonSystem, Throws]
+  boolean toggleAttribute(DOMString name, optional boolean force);
+  [CEReactions, NeedsSubjectPrincipal=NonSystem, Throws]
+  undefined setAttribute(DOMString name, DOMString value);
+  [CEReactions, NeedsSubjectPrincipal=NonSystem, Throws]
+  undefined setAttributeNS(DOMString? namespace, DOMString name, DOMString value);
+  [CEReactions, Throws]
+  undefined removeAttribute(DOMString name);
+  [CEReactions, Throws]
+  undefined removeAttributeNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  boolean hasAttribute(DOMString name);
+  [Pure]
+  boolean hasAttributeNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  boolean hasAttributes();
+
+  [Throws, Pure]
+  Element? closest(UTF8String selector);
+
+  [Throws, Pure]
+  boolean matches(UTF8String selector);
+  [Throws, Pure, BinaryName="matches"]
+  boolean webkitMatchesSelector(UTF8String selector);
+
+  [Pure]
+  HTMLCollection getElementsByTagName(DOMString localName);
+  [Throws, Pure]
+  HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
+  [Pure]
+  HTMLCollection getElementsByClassName(DOMString classNames);
+
+  [CEReactions, Throws]
+  Element? insertAdjacentElement(DOMString where, Element element); // historical
+
+  [Throws]
+  undefined insertAdjacentText(DOMString where, DOMString data); // historical
+
+  /**
+   * The ratio of font-size-inflated text font size to computed font
+   * size for this element. This will query the element for its primary frame,
+   * and then use this to get font size inflation information about the frame.
+   * This will be 1.0 if font size inflation is not enabled, and -1.0 if an
+   * error occurred during the retrieval of the font size inflation.
+   *
+   * @note The font size inflation ratio that is returned is actually the
+   *       font size inflation data for the element's _primary frame_, not the
+   *       element itself, but for most purposes, this should be sufficient.
+   */
+  [ChromeOnly]
+  readonly attribute float fontSizeInflation;
+
+  /**
+   * Returns the pseudo-element string if this element represents a
+   * pseudo-element, or null otherwise.
+   */
+  [ChromeOnly]
+  readonly attribute DOMString? implementedPseudoElement;
+
+  // Selectors API
+  /**
+   * Returns whether this element would be selected by the given selector
+   * string.
+   *
+   * See <http://dev.w3.org/2006/webapi/selectors-api2/#matchesselector>
+   */
+  [Throws, Pure, BinaryName="matches"]
+  boolean mozMatchesSelector(UTF8String selector);
+
+  // Pointer events methods.
+  [UseCounter, Throws]
+  undefined setPointerCapture(long pointerId);
+  [UseCounter, Throws]
+  undefined releasePointerCapture(long pointerId);
+  boolean hasPointerCapture(long pointerId);
+
+  // Proprietary extensions
+  /**
+   * Set this during a mousedown event to grab and retarget all mouse events
+   * to this element until the mouse button is released or releaseCapture is
+   * called. If retargetToElement is true, then all events are targetted at
+   * this element. If false, events can also fire at descendants of this
+   * element.
+   *
+   */
+  [Deprecated=ElementSetCapture, Pref="dom.mouse_capture.enabled"]
+  undefined setCapture(optional boolean retargetToElement = false);
+
+  /**
+   * If this element has captured the mouse, release the capture. If another
+   * element has captured the mouse, this method has no effect.
+   */
+  [Deprecated=ElementReleaseCapture, Pref="dom.mouse_capture.enabled"]
+  undefined releaseCapture();
+
+  /*
+   * Chrome-only version of setCapture that works outside of a mousedown event.
+   */
+  [ChromeOnly]
+  undefined setCaptureAlways(optional boolean retargetToElement = false);
+
+  // Mozilla extensions
+
+  // Obsolete methods.
+  Attr? getAttributeNode(DOMString name);
+  [CEReactions, Throws]
+  Attr? setAttributeNode(Attr newAttr);
+  [CEReactions, Throws]
+  Attr? removeAttributeNode(Attr oldAttr);
+  Attr? getAttributeNodeNS(DOMString? namespaceURI, DOMString localName);
+  [CEReactions, Throws]
+  Attr? setAttributeNodeNS(Attr newAttr);
+
+  [Func="nsContentUtils::IsCallerChromeOrElementTransformGettersEnabled"]
+  DOMMatrixReadOnly getTransformToAncestor(Element ancestor);
+  [Func="nsContentUtils::IsCallerChromeOrElementTransformGettersEnabled"]
+  DOMMatrixReadOnly getTransformToParent();
+  [Func="nsContentUtils::IsCallerChromeOrElementTransformGettersEnabled"]
+  DOMMatrixReadOnly getTransformToViewport();
+};
+
+// https://html.spec.whatwg.org/#focus-management-apis
+dictionary FocusOptions {
+  boolean preventScroll = false;
+  boolean focusVisible;
+};
+
+interface mixin HTMLOrForeignElement {
+  [SameObject] readonly attribute DOMStringMap dataset;
+  // See bug 1389421
+  // attribute DOMString nonce; // intentionally no [CEReactions]
+
+  [CEReactions, SetterThrows, Pure] attribute boolean autofocus;
+  [CEReactions, SetterThrows, Pure] attribute long tabIndex;
+  [Throws, NeedsCallerType] undefined focus(optional FocusOptions options = {});
+  [Throws] undefined blur();
+};
+
+// https://drafts.csswg.org/cssom/#the-elementcssinlinestyle-mixin
+interface mixin ElementCSSInlineStyle {
+  [SameObject, PutForwards=cssText]
+  readonly attribute CSSStyleDeclaration style;
+};
+
+// http://dev.w3.org/csswg/cssom-view/
+enum ScrollLogicalPosition { "start", "center", "end", "nearest" };
+dictionary ScrollIntoViewOptions : ScrollOptions {
+  ScrollLogicalPosition block = "start";
+  ScrollLogicalPosition inline = "nearest";
+};
+
+dictionary CheckVisibilityOptions {
+  boolean checkOpacity = false;
+  boolean checkVisibilityCSS = false;
+  [ChromeOnly] boolean flush = true;
+};
+
+// http://dev.w3.org/csswg/cssom-view/#extensions-to-the-element-interface
+partial interface Element {
+  DOMRectList getClientRects();
+  DOMRect getBoundingClientRect();
+
+  boolean checkVisibility(optional CheckVisibilityOptions options = {});
+
+  // scrolling
+  undefined scrollIntoView(optional (boolean or ScrollIntoViewOptions) arg = {});
+  // None of the CSSOM attributes are [Pure], because they flush
+           attribute long scrollTop;   // scroll on setting
+           attribute long scrollLeft;  // scroll on setting
+  readonly attribute long scrollWidth;
+  readonly attribute long scrollHeight;
+
+  undefined scroll(unrestricted double x, unrestricted double y);
+  undefined scroll(optional ScrollToOptions options = {});
+  undefined scrollTo(unrestricted double x, unrestricted double y);
+  undefined scrollTo(optional ScrollToOptions options = {});
+  undefined scrollBy(unrestricted double x, unrestricted double y);
+  undefined scrollBy(optional ScrollToOptions options = {});
+  // mozScrollSnap is used by chrome to perform scroll snapping after the
+  // user performs actions that may affect scroll position
+  // mozScrollSnap is deprecated, to be replaced by a web accessible API, such
+  // as an extension to the ScrollOptions dictionary.  See bug 1137937.
+  [ChromeOnly] undefined mozScrollSnap();
+
+  readonly attribute long clientTop;
+  readonly attribute long clientLeft;
+  readonly attribute long clientWidth;
+  readonly attribute long clientHeight;
+
+  // Return the screen coordinates of the element, in CSS pixels relative to
+  // the window's screen.
+  [ChromeOnly] readonly attribute long screenX;
+  [ChromeOnly] readonly attribute long screenY;
+  [ChromeOnly] readonly attribute nsIScreen? screen;
+
+  // Mozilla specific stuff
+  /* The minimum/maximum offset that the element can be scrolled to
+     (i.e., the value that scrollLeft/scrollTop would be clamped to if they were
+     set to arbitrarily large values. */
+  [ChromeOnly] readonly attribute long scrollTopMin;
+               readonly attribute long scrollTopMax;
+  [ChromeOnly] readonly attribute long scrollLeftMin;
+               readonly attribute long scrollLeftMax;
+};
+
+// http://domparsing.spec.whatwg.org/#extensions-to-the-element-interface
+partial interface Element {
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, Pure, SetterThrows, GetterCanOOM]
+  attribute [LegacyNullToEmptyString] DOMString innerHTML;
+  [CEReactions, Pure, SetterThrows]
+  attribute [LegacyNullToEmptyString] DOMString outerHTML;
+  [CEReactions, Throws]
+  undefined insertAdjacentHTML(DOMString position, DOMString text);
+};
+
+// http://www.w3.org/TR/selectors-api/#interface-definitions
+partial interface Element {
+  [Throws, Pure]
+  Element?  querySelector(UTF8String selectors);
+  [Throws, Pure]
+  NodeList  querySelectorAll(UTF8String selectors);
+};
+
+// https://dom.spec.whatwg.org/#dictdef-shadowrootinit
+dictionary ShadowRootInit {
+  required ShadowRootMode mode;
+  [Pref="dom.shadowdom.delegatesFocus.enabled"]
+  boolean delegatesFocus = false;
+  [Pref="dom.shadowdom.slot.assign.enabled"]
+  SlotAssignmentMode slotAssignment = "named";
+};
+
+// https://dom.spec.whatwg.org/#element
+partial interface Element {
+  // Shadow DOM v1
+  [Throws, UseCounter]
+  ShadowRoot attachShadow(ShadowRootInit shadowRootInitDict);
+  [BinaryName="shadowRootByMode"]
+  readonly attribute ShadowRoot? shadowRoot;
+
+  [Func="Document::IsCallerChromeOrAddon", BinaryName="shadowRoot"]
+  readonly attribute ShadowRoot? openOrClosedShadowRoot;
+
+  [BinaryName="assignedSlotByMode"]
+  readonly attribute HTMLSlotElement? assignedSlot;
+
+  [ChromeOnly, BinaryName="assignedSlot"]
+  readonly attribute HTMLSlotElement? openOrClosedAssignedSlot;
+
+  [CEReactions, Unscopable, SetterThrows]
+           attribute DOMString slot;
+};
+
+Element includes ChildNode;
+Element includes NonDocumentTypeChildNode;
+Element includes ParentNode;
+Element includes Animatable;
+Element includes GeometryUtils;
+Element includes AccessibilityRole;
+Element includes AriaAttributes;
+
+// https://fullscreen.spec.whatwg.org/#api
+partial interface Element {
+  [NewObject, NeedsCallerType]
+  Promise<undefined> requestFullscreen();
+  [NewObject, BinaryName="requestFullscreen", NeedsCallerType, Deprecated="MozRequestFullScreenDeprecatedPrefix"]
+  Promise<undefined> mozRequestFullScreen();
+
+  // Events handlers
+  attribute EventHandler onfullscreenchange;
+  attribute EventHandler onfullscreenerror;
+};
+
+// https://w3c.github.io/pointerlock/#extensions-to-the-element-interface
+partial interface Element {
+  [NeedsCallerType, Pref="dom.pointer-lock.enabled"]
+  undefined requestPointerLock();
+};
+
+// Mozilla-specific additions to support devtools
+partial interface Element {
+  // Support reporting of Flexbox properties
+  /**
+   * If this element has a display:flex or display:inline-flex style,
+   * this property returns an object with computed values for flex
+   * properties, as well as a property that exposes the flex lines
+   * in this container.
+   */
+  [ChromeOnly, Pure]
+  Flex? getAsFlexContainer();
+
+  // Support reporting of Grid properties
+  /**
+   * If this element has a display:grid or display:inline-grid style,
+   * this property returns an object with computed values for grid
+   * tracks and lines.
+   */
+  [ChromeOnly, Pure]
+  sequence<Grid> getGridFragments();
+
+  /**
+   * Returns whether there are any grid fragments on this element.
+   */
+  [ChromeOnly, Pure]
+  boolean hasGridFragments();
+
+  /**
+   * Returns a sequence of all the descendent elements of this element
+   * that have display:grid or display:inline-grid style and generate
+   * a frame.
+   */
+  [ChromeOnly, Pure]
+  sequence<Element> getElementsWithGrid();
+
+  /**
+   * Set attribute on the Element with a customized Content-Security-Policy
+   * appropriate to devtools, which includes:
+   * style-src 'unsafe-inline'
+   */
+  [ChromeOnly, CEReactions, Throws]
+  undefined setAttributeDevtools(DOMString name, DOMString value);
+  [ChromeOnly, CEReactions, Throws]
+  undefined setAttributeDevtoolsNS(DOMString? namespace, DOMString name, DOMString value);
+
+  /**
+   * Provide a direct way to determine if this Element has visible
+   * scrollbars. Flushes layout.
+   */
+  [ChromeOnly]
+  readonly attribute boolean hasVisibleScrollbars;
+};
+
+// These variables are used in vtt.js, they are used for positioning vtt cues.
+partial interface Element {
+  // These two attributes are a double version of the clientHeight and the
+  // clientWidth.
+  [ChromeOnly]
+  readonly attribute double clientHeightDouble;
+  [ChromeOnly]
+  readonly attribute double clientWidthDouble;
+  // This attribute returns the block size of the first line box under the different
+  // writing directions. If the direction is horizontal, it represents box's
+  // height. If the direction is vertical, it represents box's width.
+  [ChromeOnly]
+  readonly attribute double firstLineBoxBSize;
+};
+
+
+// Sanitizer API, https://wicg.github.io/sanitizer-api/
+dictionary SetHTMLOptions {
+  Sanitizer sanitizer;
+};
+
+partial interface Element {
+  [SecureContext, UseCounter, Throws, Pref="dom.security.setHTML.enabled"]
+  undefined setHTML(DOMString aInnerHTML, optional SetHTMLOptions options = {});
+};
diff --git a/dom/webidl/ElementInternals.webidl b/dom/webidl/ElementInternals.webidl
new file mode 100644
index 0000000000..fdf4045e80
--- /dev/null
+++ b/dom/webidl/ElementInternals.webidl
@@ -0,0 +1,61 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/#elementinternals
+ */
+
+[Exposed=Window]
+interface ElementInternals {
+  // Shadow root access
+  readonly attribute ShadowRoot? shadowRoot;
+
+  // Form-associated custom elements
+  [Throws]
+  undefined setFormValue((File or USVString or FormData)? value,
+                         optional (File or USVString or FormData)? state);
+
+  [Throws]
+  readonly attribute HTMLFormElement? form;
+
+  [Throws]
+  undefined setValidity(optional ValidityStateFlags flags = {},
+                        optional DOMString message,
+                        optional HTMLElement anchor);
+  [Throws]
+  readonly attribute boolean willValidate;
+  [Throws]
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  [Throws]
+  boolean checkValidity();
+  [Throws]
+  boolean reportValidity();
+
+  [Throws]
+  readonly attribute NodeList labels;
+};
+
+partial interface ElementInternals {
+  [ChromeOnly, Throws]
+  readonly attribute HTMLElement? validationAnchor;
+};
+
+ElementInternals includes AccessibilityRole;
+ElementInternals includes AriaAttributes;
+
+dictionary ValidityStateFlags {
+  boolean valueMissing = false;
+  boolean typeMismatch = false;
+  boolean patternMismatch = false;
+  boolean tooLong = false;
+  boolean tooShort = false;
+  boolean rangeUnderflow = false;
+  boolean rangeOverflow = false;
+  boolean stepMismatch = false;
+  boolean badInput = false;
+  boolean customError = false;
+};
diff --git a/dom/webidl/ErrorEvent.webidl b/dom/webidl/ErrorEvent.webidl
new file mode 100644
index 0000000000..7ff6faf720
--- /dev/null
+++ b/dom/webidl/ErrorEvent.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/#the-errorevent-interface
+ */
+
+[Exposed=(Window,Worker)]
+interface ErrorEvent : Event
+{
+  constructor(DOMString type, optional ErrorEventInit eventInitDict = {});
+
+  readonly attribute DOMString message;
+  readonly attribute DOMString filename;
+  readonly attribute unsigned long lineno;
+  readonly attribute unsigned long colno;
+  readonly attribute any error;
+};
+
+dictionary ErrorEventInit : EventInit
+{
+  DOMString message = "";
+  DOMString filename = "";
+  unsigned long lineno = 0;
+  unsigned long colno = 0;
+  any error;
+};
diff --git a/dom/webidl/Event.webidl b/dom/webidl/Event.webidl
new file mode 100644
index 0000000000..4d9a879284
--- /dev/null
+++ b/dom/webidl/Event.webidl
@@ -0,0 +1,107 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker), ProbablyShortLivingWrapper]
+interface Event {
+  constructor(DOMString type, optional EventInit eventInitDict = {});
+
+  [Pure]
+  readonly attribute DOMString type;
+  [Pure, BindingAlias="srcElement"]
+  readonly attribute EventTarget? target;
+  [Pure]
+  readonly attribute EventTarget? currentTarget;
+
+  sequence<EventTarget> composedPath();
+
+  const unsigned short NONE = 0;
+  const unsigned short CAPTURING_PHASE = 1;
+  const unsigned short AT_TARGET = 2;
+  const unsigned short BUBBLING_PHASE = 3;
+  [Pure]
+  readonly attribute unsigned short eventPhase;
+
+  undefined stopPropagation();
+  undefined stopImmediatePropagation();
+
+  [Pure]
+  readonly attribute boolean bubbles;
+  [Pure]
+  readonly attribute boolean cancelable;
+  [NeedsCallerType]
+  attribute boolean returnValue;
+  [NeedsCallerType]
+  undefined preventDefault();
+  [Pure, NeedsCallerType]
+  readonly attribute boolean defaultPrevented;
+  [ChromeOnly, Pure]
+  readonly attribute boolean defaultPreventedByChrome;
+  [ChromeOnly, Pure]
+  readonly attribute boolean defaultPreventedByContent;
+  [Pure]
+  readonly attribute boolean composed;
+
+  [LegacyUnforgeable, Pure]
+  readonly attribute boolean isTrusted;
+  [Pure]
+  readonly attribute DOMHighResTimeStamp timeStamp;
+
+  undefined initEvent(DOMString type,
+                      optional boolean bubbles = false,
+                      optional boolean cancelable = false);
+  attribute boolean cancelBubble;
+};
+
+// Mozilla specific legacy stuff.
+partial interface Event {
+  const long ALT_MASK     = 0x00000001;
+  const long CONTROL_MASK = 0x00000002;
+  const long SHIFT_MASK   = 0x00000004;
+  const long META_MASK    = 0x00000008;
+
+  /** The original target of the event, before any retargetings. */
+  readonly attribute EventTarget? originalTarget;
+  /**
+   * The explicit original target of the event.  If the event was retargeted
+   * for some reason other than an anonymous boundary crossing, this will be set
+   * to the target before the retargeting occurs.  For example, mouse events
+   * are retargeted to their parent node when they happen over text nodes (bug
+   * 185889), and in that case .target will show the parent and
+   * .explicitOriginalTarget will show the text node.
+   * .explicitOriginalTarget differs from .originalTarget in that it will never
+   * contain anonymous content.
+   */
+  readonly attribute EventTarget? explicitOriginalTarget;
+  [ChromeOnly] readonly attribute EventTarget? composedTarget;
+  [ChromeOnly] undefined preventMultipleActions();
+  [ChromeOnly] readonly attribute boolean multipleActionsPrevented;
+  [ChromeOnly] readonly attribute boolean isSynthesized;
+  /**
+   * When the event target is a remote browser, calling this will fire an
+   * reply event in the chrome process.
+   */
+  [ChromeOnly] undefined requestReplyFromRemoteContent();
+  /**
+   * Returns true when the event shouldn't be handled by chrome.
+   */
+  [ChromeOnly] readonly attribute boolean isWaitingReplyFromRemoteContent;
+  /**
+   * Returns true when the event is a reply event from a remote process.
+   */
+  [ChromeOnly] readonly attribute boolean isReplyEventFromRemoteContent;
+};
+
+dictionary EventInit {
+  boolean bubbles = false;
+  boolean cancelable = false;
+  boolean composed = false;
+};
diff --git a/dom/webidl/EventHandler.webidl b/dom/webidl/EventHandler.webidl
new file mode 100644
index 0000000000..d20496f781
--- /dev/null
+++ b/dom/webidl/EventHandler.webidl
@@ -0,0 +1,184 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#eventhandler
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+[LegacyTreatNonObjectAsNull]
+callback EventHandlerNonNull = any (Event event);
+typedef EventHandlerNonNull? EventHandler;
+
+[LegacyTreatNonObjectAsNull]
+callback OnBeforeUnloadEventHandlerNonNull = DOMString? (Event event);
+typedef OnBeforeUnloadEventHandlerNonNull? OnBeforeUnloadEventHandler;
+
+[LegacyTreatNonObjectAsNull]
+callback OnErrorEventHandlerNonNull = any ((Event or DOMString) event, optional DOMString source, optional unsigned long lineno, optional unsigned long column, optional any error);
+typedef OnErrorEventHandlerNonNull? OnErrorEventHandler;
+
+interface mixin GlobalEventHandlers {
+           attribute EventHandler onabort;
+           attribute EventHandler onblur;
+// We think the spec is wrong here. See OnErrorEventHandlerForNodes/Window
+// below.
+//         attribute OnErrorEventHandler onerror;
+           attribute EventHandler onfocus;
+           //(Not implemented)attribute EventHandler oncancel;
+           attribute EventHandler onauxclick;
+           [Pref="dom.input_events.beforeinput.enabled"]
+           attribute EventHandler onbeforeinput;
+           [Pref="dom.element.popover.enabled"]
+           attribute EventHandler onbeforetoggle;
+           attribute EventHandler oncanplay;
+           attribute EventHandler oncanplaythrough;
+           attribute EventHandler onchange;
+           attribute EventHandler onclick;
+           attribute EventHandler onclose;
+           attribute EventHandler oncontextmenu;
+           attribute EventHandler oncopy;
+           attribute EventHandler oncuechange;
+           attribute EventHandler oncut;
+           attribute EventHandler ondblclick;
+           attribute EventHandler ondrag;
+           attribute EventHandler ondragend;
+           attribute EventHandler ondragenter;
+           [Func="Event::IsDragExitEnabled"]
+           attribute EventHandler ondragexit;
+           attribute EventHandler ondragleave;
+           attribute EventHandler ondragover;
+           attribute EventHandler ondragstart;
+           attribute EventHandler ondrop;
+           attribute EventHandler ondurationchange;
+           attribute EventHandler onemptied;
+           attribute EventHandler onended;
+           attribute EventHandler onformdata;
+           attribute EventHandler oninput;
+           attribute EventHandler oninvalid;
+           attribute EventHandler onkeydown;
+           attribute EventHandler onkeypress;
+           attribute EventHandler onkeyup;
+           attribute EventHandler onload;
+           attribute EventHandler onloadeddata;
+           attribute EventHandler onloadedmetadata;
+           attribute EventHandler onloadstart;
+           attribute EventHandler onmousedown;
+  [LegacyLenientThis] attribute EventHandler onmouseenter;
+  [LegacyLenientThis] attribute EventHandler onmouseleave;
+           attribute EventHandler onmousemove;
+           attribute EventHandler onmouseout;
+           attribute EventHandler onmouseover;
+           attribute EventHandler onmouseup;
+           attribute EventHandler onwheel;
+           attribute EventHandler onpaste;
+           attribute EventHandler onpause;
+           attribute EventHandler onplay;
+           attribute EventHandler onplaying;
+           attribute EventHandler onprogress;
+           attribute EventHandler onratechange;
+           attribute EventHandler onreset;
+           attribute EventHandler onresize;
+           attribute EventHandler onscroll;
+           [Pref="apz.scrollend-event.content.enabled"]
+           attribute EventHandler onscrollend;
+           attribute EventHandler onsecuritypolicyviolation;
+           attribute EventHandler onseeked;
+           attribute EventHandler onseeking;
+           attribute EventHandler onselect;
+           attribute EventHandler onslotchange;
+           //(Not implemented)attribute EventHandler onsort;
+           attribute EventHandler onstalled;
+           attribute EventHandler onsubmit;
+           attribute EventHandler onsuspend;
+           attribute EventHandler ontimeupdate;
+           attribute EventHandler onvolumechange;
+           attribute EventHandler onwaiting;
+
+           attribute EventHandler onselectstart;
+           attribute EventHandler onselectionchange;
+
+           attribute EventHandler ontoggle;
+
+           // Pointer events handlers
+           attribute EventHandler onpointercancel;
+           attribute EventHandler onpointerdown;
+           attribute EventHandler onpointerup;
+           attribute EventHandler onpointermove;
+           attribute EventHandler onpointerout;
+           attribute EventHandler onpointerover;
+           attribute EventHandler onpointerenter;
+           attribute EventHandler onpointerleave;
+           attribute EventHandler ongotpointercapture;
+           attribute EventHandler onlostpointercapture;
+
+           // Mozilla-specific handlers. Unprefixed handlers live in
+           // Document rather than here.
+           [Deprecated="MozfullscreenchangeDeprecatedPrefix"]
+           attribute EventHandler onmozfullscreenchange;
+           [Deprecated="MozfullscreenerrorDeprecatedPrefix"]
+           attribute EventHandler onmozfullscreenerror;
+
+           // CSS-Animation and CSS-Transition handlers.
+           attribute EventHandler onanimationcancel;
+           attribute EventHandler onanimationend;
+           attribute EventHandler onanimationiteration;
+           attribute EventHandler onanimationstart;
+           attribute EventHandler ontransitioncancel;
+           attribute EventHandler ontransitionend;
+           attribute EventHandler ontransitionrun;
+           attribute EventHandler ontransitionstart;
+
+           // CSS-Animation and CSS-Transition legacy handlers.
+           // This handler isn't standard.
+           [BinaryName="onwebkitAnimationEnd"]
+           attribute EventHandler onwebkitanimationend;
+           [BinaryName="onwebkitAnimationIteration"]
+           attribute EventHandler onwebkitanimationiteration;
+           [BinaryName="onwebkitAnimationStart"]
+           attribute EventHandler onwebkitanimationstart;
+           [BinaryName="onwebkitTransitionEnd"]
+           attribute EventHandler onwebkittransitionend;
+};
+
+interface mixin WindowEventHandlers {
+           attribute EventHandler onafterprint;
+           attribute EventHandler onbeforeprint;
+           attribute OnBeforeUnloadEventHandler onbeforeunload;
+           attribute EventHandler onhashchange;
+           attribute EventHandler onlanguagechange;
+           attribute EventHandler onmessage;
+           attribute EventHandler onmessageerror;
+           attribute EventHandler onoffline;
+           attribute EventHandler ononline;
+           attribute EventHandler onpagehide;
+           attribute EventHandler onpageshow;
+           attribute EventHandler onpopstate;
+           attribute EventHandler onrejectionhandled;
+           attribute EventHandler onstorage;
+           attribute EventHandler onunhandledrejection;
+           attribute EventHandler onunload;
+};
+
+// https://w3c.github.io/gamepad/#extensions-to-the-windoweventhandlers-interface-mixin
+partial interface mixin WindowEventHandlers {
+  attribute EventHandler ongamepadconnected;
+  attribute EventHandler ongamepaddisconnected;
+};
+
+// The spec has |attribute OnErrorEventHandler onerror;| on
+// GlobalEventHandlers, and calls the handler differently depending on
+// whether an ErrorEvent was fired. We don't do that, and until we do we'll
+// need to distinguish between onerror on Window or on nodes.
+
+interface mixin OnErrorEventHandlerForNodes {
+           attribute EventHandler onerror;
+};
+
+interface mixin OnErrorEventHandlerForWindow {
+           attribute OnErrorEventHandler onerror;
+};
diff --git a/dom/webidl/EventListener.webidl b/dom/webidl/EventListener.webidl
new file mode 100644
index 0000000000..441be769fc
--- /dev/null
+++ b/dom/webidl/EventListener.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+callback interface EventListener {
+  undefined handleEvent(Event event);
+};
diff --git a/dom/webidl/EventSource.webidl b/dom/webidl/EventSource.webidl
new file mode 100644
index 0000000000..86c731dacb
--- /dev/null
+++ b/dom/webidl/EventSource.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/comms.html#the-eventsource-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface EventSource : EventTarget {
+  [Throws]
+  constructor(USVString url, optional EventSourceInit eventSourceInitDict = {});
+
+  [Constant]
+  readonly attribute DOMString url;
+  [Constant]
+  readonly attribute boolean withCredentials;
+
+  // ready state
+  const unsigned short CONNECTING = 0;
+  const unsigned short OPEN = 1;
+  const unsigned short CLOSED = 2;
+  readonly attribute unsigned short readyState;
+
+  // networking
+  attribute EventHandler onopen;
+  attribute EventHandler onmessage;
+  attribute EventHandler onerror;
+  undefined close();
+};
+
+dictionary EventSourceInit {
+  boolean withCredentials = false;
+};
diff --git a/dom/webidl/EventTarget.webidl b/dom/webidl/EventTarget.webidl
new file mode 100644
index 0000000000..5fe193a034
--- /dev/null
+++ b/dom/webidl/EventTarget.webidl
@@ -0,0 +1,73 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+
+dictionary EventListenerOptions {
+  boolean capture = false;
+  /* Setting to true make the listener be added to the system group. */
+  [Func="ThreadSafeIsChromeOrUAWidget"]
+  boolean mozSystemGroup = false;
+};
+
+dictionary AddEventListenerOptions : EventListenerOptions {
+  boolean passive;
+  boolean once = false;
+  AbortSignal signal;
+  [ChromeOnly]
+  boolean wantUntrusted;
+};
+
+[Exposed=*]
+interface EventTarget {
+  [Throws]
+  constructor();
+
+  /* Passing null for wantsUntrusted means "default behavior", which
+     differs in content and chrome.  In content that default boolean
+     value is true, while in chrome the default boolean value is
+     false. */
+  [Throws]
+  undefined addEventListener(DOMString type,
+                             EventListener? listener,
+                             optional (AddEventListenerOptions or boolean) options = {},
+                             optional boolean? wantsUntrusted = null);
+  [Throws]
+  undefined removeEventListener(DOMString type,
+                                EventListener? listener,
+                                optional (EventListenerOptions or boolean) options = {});
+  [Throws, NeedsCallerType]
+  boolean dispatchEvent(Event event);
+};
+
+// Mozilla extensions for use by JS-implemented event targets to
+// implement on* properties.
+partial interface EventTarget {
+  // The use of [TreatNonCallableAsNull] here is a bit of a hack: it just makes
+  // the codegen check whether the type involved is either
+  // [TreatNonCallableAsNull] or [TreatNonObjectAsNull] and if it is handle it
+  // accordingly.  In particular, it will NOT actually treat a non-null
+  // non-callable object as null here.
+  [ChromeOnly, Throws]
+  undefined setEventHandler(DOMString type,
+                            [TreatNonCallableAsNull] EventHandler handler);
+
+  [ChromeOnly]
+  EventHandler getEventHandler(DOMString type);
+};
+
+// Mozilla extension to make firing events on event targets from
+// chrome easier.  This returns the window which can be used to create
+// events to fire at this EventTarget, or null if there isn't one.
+partial interface EventTarget {
+  [ChromeOnly, Exposed=Window, BinaryName="ownerGlobalForBindings"]
+  readonly attribute WindowProxy? ownerGlobal;
+};
diff --git a/dom/webidl/ExtendableEvent.webidl b/dom/webidl/ExtendableEvent.webidl
new file mode 100644
index 0000000000..8bb8b665ac
--- /dev/null
+++ b/dom/webidl/ExtendableEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ */
+
+[Exposed=ServiceWorker]
+interface ExtendableEvent : Event {
+  constructor(DOMString type, optional ExtendableEventInit eventInitDict = {});
+
+  // https://github.com/slightlyoff/ServiceWorker/issues/261
+  [Throws]
+  undefined waitUntil(Promise<any> p);
+};
+
+dictionary ExtendableEventInit : EventInit {
+  // Defined for the forward compatibility across the derived events
+};
diff --git a/dom/webidl/ExtendableMessageEvent.webidl b/dom/webidl/ExtendableMessageEvent.webidl
new file mode 100644
index 0000000000..cde11e8e75
--- /dev/null
+++ b/dom/webidl/ExtendableMessageEvent.webidl
@@ -0,0 +1,46 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://w3c.github.io/ServiceWorker/#extendablemessage-event-section
+ */
+
+[Exposed=(ServiceWorker)]
+interface ExtendableMessageEvent : ExtendableEvent {
+  constructor(DOMString type,
+              optional ExtendableMessageEventInit eventInitDict = {});
+
+  /**
+   * Custom data associated with this event.
+   */
+  [GetterThrows]
+  readonly attribute any data;
+
+  /**
+   * The origin of the site from which this event originated.
+   */
+  readonly attribute DOMString origin;
+
+  /**
+   * The last event ID string of the event source.
+   */
+  readonly attribute DOMString lastEventId;
+
+  /**
+   * The client, service worker or port which originated this event.
+   */
+  readonly attribute (Client or ServiceWorker or MessagePort)? source;
+
+  [Constant, Cached, Frozen]
+  readonly attribute sequence<MessagePort> ports;
+};
+
+dictionary ExtendableMessageEventInit : ExtendableEventInit {
+  any data = null;
+  DOMString origin = "";
+  DOMString lastEventId = "";
+  (Client or ServiceWorker or MessagePort)? source = null;
+  sequence<MessagePort> ports = [];
+};
diff --git a/dom/webidl/ExtensionAlarms.webidl b/dom/webidl/ExtensionAlarms.webidl
new file mode 100644
index 0000000000..eb51a3a94c
--- /dev/null
+++ b/dom/webidl/ExtensionAlarms.webidl
@@ -0,0 +1,58 @@
+/*
+ *  THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT
+ *
+ *  The content of this file has been generated based on the WebExtensions API
+ *  JSONSchema using the following command:
+ *
+ *  export SCRIPT_DIR="toolkit/components/extensions/webidl-api"
+ *  mach python $SCRIPT_DIR/GenerateWebIDLBindings.py -- alarms
+ *
+ *  More info about generating webidl API bindings for WebExtensions API at:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ *  A short summary of the special setup used by these WebIDL files (meant to aid
+ *  webidl peers reviews and sign-offs) is available in the following section:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+// WebIDL definition for the "alarms" WebExtensions API
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionAlarms {
+  // API methods.
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined create(DOMString name, any alarmInfo);
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined create(any alarmInfo);
+
+  [Throws, WebExtensionStub="Async"]
+  any get(DOMString name, optional Function callback);
+  [Throws, WebExtensionStub="Async"]
+  any get(optional Function callback);
+
+  [Throws, WebExtensionStub="Async"]
+  any getAll(optional Function callback);
+
+  [Throws, WebExtensionStub="Async"]
+  any clear(DOMString name, optional Function callback);
+  [Throws, WebExtensionStub="Async"]
+  any clear(optional Function callback);
+
+  [Throws, WebExtensionStub="Async"]
+  any clearAll(optional Function callback);
+
+  // API events.
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onAlarm;
+};
diff --git a/dom/webidl/ExtensionBrowser.webidl b/dom/webidl/ExtensionBrowser.webidl
new file mode 100644
index 0000000000..09e06053f8
--- /dev/null
+++ b/dom/webidl/ExtensionBrowser.webidl
@@ -0,0 +1,76 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ *
+ * This IDL file is related to interface mixin for the additional globals that should be
+ * available in windows and service workers allowed to access the WebExtensions API and
+ * the WebExtensions browser API namespace.
+ *
+ * More info about generating webidl API bindings for WebExtensions API at:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ * A short summary of the special setup used by these WebIDL files (meant to aid
+ * webidl peers reviews and sign-offs) is available in the following section:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+// WebExtensions API interface mixin (used to include ExtensionBrowser interface
+// in the ServiceWorkerGlobalScope and Window).
+[Exposed=(ServiceWorker)]
+interface mixin ExtensionGlobalsMixin {
+  [Replaceable, SameObject, BinaryName="AcquireExtensionBrowser",
+   BindingAlias="chrome", Func="extensions::ExtensionAPIAllowed"]
+  readonly attribute ExtensionBrowser browser;
+};
+
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionBrowser {
+  // A mock API only exposed in tests to unit test the internals
+  // meant to be reused by the real WebExtensions API bindings
+  // in xpcshell tests.
+  [Replaceable, SameObject, BinaryName="GetExtensionMockAPI",
+   Func="mozilla::extensions::ExtensionMockAPI::IsAllowed",
+   Pref="extensions.webidl-api.expose_mock_interface"]
+  readonly attribute ExtensionMockAPI mockExtensionAPI;
+
+  // `browser.alarms` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionAlarms",
+   Func="mozilla::extensions::ExtensionAlarms::IsAllowed"]
+  readonly attribute ExtensionAlarms alarms;
+
+  // `browser.browserSettings` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionBrowserSettings",
+   Func="mozilla::extensions::ExtensionBrowserSettings::IsAllowed"]
+  readonly attribute ExtensionBrowserSettings browserSettings;
+
+  // `browser.dns` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionDns",
+   Func="mozilla::extensions::ExtensionDns::IsAllowed"]
+  readonly attribute ExtensionDns dns;
+
+  // `browser.proxy` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionProxy",
+   Func="mozilla::extensions::ExtensionProxy::IsAllowed"]
+  readonly attribute ExtensionProxy proxy;
+
+  // `browser.runtime` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionRuntime",
+   Func="mozilla::extensions::ExtensionRuntime::IsAllowed"]
+  readonly attribute ExtensionRuntime runtime;
+
+  // `browser.scripting` API namespace
+  [Replaceable, SameObject, BinaryName="GetExtensionScripting",
+    Func="mozilla::extensions::ExtensionScripting::IsAllowed"]
+  readonly attribute ExtensionScripting scripting;
+
+  // `browser.test` API namespace, available in tests.
+  [Replaceable, SameObject, BinaryName="GetExtensionTest",
+   Func="mozilla::extensions::ExtensionTest::IsAllowed"]
+  readonly attribute ExtensionTest test;
+};
diff --git a/dom/webidl/ExtensionBrowserSettings.webidl b/dom/webidl/ExtensionBrowserSettings.webidl
new file mode 100644
index 0000000000..740537d6d5
--- /dev/null
+++ b/dom/webidl/ExtensionBrowserSettings.webidl
@@ -0,0 +1,93 @@
+/*
+ *  THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT
+ *
+ *  The content of this file has been generated based on the WebExtensions API
+ *  JSONSchema using the following command:
+ *
+ *  export SCRIPT_DIR="toolkit/components/extensions/webidl-api"
+ *  mach python $SCRIPT_DIR/GenerateWebIDLBindings.py -- browserSettings
+ *
+ *  More info about generating webidl API bindings for WebExtensions API at:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ *  A short summary of the special setup used by these WebIDL files (meant to aid
+ *  webidl peers reviews and sign-offs) is available in the following section:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+// WebIDL definition for the "browserSettings" WebExtensions API
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionBrowserSettings {
+  // API properties.
+
+  [Replaceable]
+  readonly attribute ExtensionSetting allowPopupsForUserEvents;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting cacheEnabled;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting closeTabsByDoubleClick;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting contextMenuShowEvent;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting ftpProtocolEnabled;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting homepageOverride;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting imageAnimationBehavior;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting newTabPageOverride;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting newTabPosition;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting openBookmarksInNewTabs;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting openSearchResultsInNewTabs;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting openUrlbarResultsInNewTabs;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting webNotificationsDisabled;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting overrideDocumentColors;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting overrideContentColorScheme;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting useDocumentFonts;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting zoomFullPage;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting zoomSiteSpecific;
+
+  // API child namespaces.
+
+  [Replaceable, SameObject,
+  BinaryName="GetExtensionBrowserSettingsColorManagement",
+  Func="mozilla::extensions::ExtensionBrowserSettingsColorManagement::IsAllowed"]
+  readonly attribute ExtensionBrowserSettingsColorManagement colorManagement;
+};
diff --git a/dom/webidl/ExtensionBrowserSettingsColorManagement.webidl b/dom/webidl/ExtensionBrowserSettingsColorManagement.webidl
new file mode 100644
index 0000000000..6409563058
--- /dev/null
+++ b/dom/webidl/ExtensionBrowserSettingsColorManagement.webidl
@@ -0,0 +1,41 @@
+/*
+ *  THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT
+ *
+ *  The content of this file has been generated based on the WebExtensions API
+ *  JSONSchema using the following command:
+ *
+ *  export SCRIPT_DIR="toolkit/components/extensions/webidl-api"
+ *  mach python $SCRIPT_DIR/GenerateWebIDLBindings.py -- browserSettings.colorManagement
+ *
+ *  More info about generating webidl API bindings for WebExtensions API at:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ *  A short summary of the special setup used by these WebIDL files (meant to aid
+ *  webidl peers reviews and sign-offs) is available in the following section:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+// WebIDL definition for the "browserSettings.colorManagement" WebExtensions API
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionBrowserSettingsColorManagement {
+  // API properties.
+
+  [Replaceable]
+  readonly attribute ExtensionSetting mode;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting useNativeSRGB;
+
+  [Replaceable]
+  readonly attribute ExtensionSetting useWebRenderCompositor;
+};
diff --git a/dom/webidl/ExtensionDns.webidl b/dom/webidl/ExtensionDns.webidl
new file mode 100644
index 0000000000..f64a605664
--- /dev/null
+++ b/dom/webidl/ExtensionDns.webidl
@@ -0,0 +1,35 @@
+/*
+ *  THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT
+ *
+ *  The content of this file has been generated based on the WebExtensions API
+ *  JSONSchema using the following command:
+ *
+ *  export SCRIPT_DIR="toolkit/components/extensions/webidl-api"
+ *  mach python $SCRIPT_DIR/GenerateWebIDLBindings.py -- dns
+ *
+ *  More info about generating webidl API bindings for WebExtensions API at:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ *  A short summary of the special setup used by these WebIDL files (meant to aid
+ *  webidl peers reviews and sign-offs) is available in the following section:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+// WebIDL definition for the "dns" WebExtensions API
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionDns {
+  // API methods.
+
+  [Throws, WebExtensionStub="AsyncAmbiguous"]
+  any resolve(any... args);
+};
diff --git a/dom/webidl/ExtensionEventManager.webidl b/dom/webidl/ExtensionEventManager.webidl
new file mode 100644
index 0000000000..9514b2e357
--- /dev/null
+++ b/dom/webidl/ExtensionEventManager.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ *
+ * This IDL file is related to the WebExtensions API object.
+ *
+ * More info about generating webidl API bindings for WebExtensions API at:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ * A short summary of the special setup used by these WebIDL files (meant to aid
+ * webidl peers reviews and sign-offs) is available in the following section:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionEventManager {
+  [Throws]
+  undefined addListener(Function callback, optional object listenerOptions);
+
+  [Throws]
+  undefined removeListener(Function callback);
+
+  [Throws]
+  boolean hasListener(Function callback);
+
+  [Throws]
+  boolean hasListeners();
+};
diff --git a/dom/webidl/ExtensionMockAPI.webidl b/dom/webidl/ExtensionMockAPI.webidl
new file mode 100644
index 0000000000..667fa9a772
--- /dev/null
+++ b/dom/webidl/ExtensionMockAPI.webidl
@@ -0,0 +1,55 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ *
+ * This IDL file is related to the WebExtensions API object only used in
+ * unit tests.
+ *
+ * More info about generating webidl API bindings for WebExtensions API at:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ * A short summary of the special setup used by these WebIDL files (meant to aid
+ * webidl peers reviews and sign-offs) is available in the following section:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+// WebIDL definition for the "mockExtensionAPI" WebExtensions API,
+// only available in tests and locked behind an about:config preference
+// ("extensions.webidl-api.expose_mock_interface").
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionMockAPI {
+  // Test API methods scenarios.
+
+  [Throws, WebExtensionStub]
+  any methodSyncWithReturn(any... args);
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined methodNoReturn(any... args);
+
+  [Throws, WebExtensionStub="Async"]
+  any methodAsync(any arg0, optional Function cb);
+
+  [Throws, WebExtensionStub="AsyncAmbiguous"]
+  any methodAmbiguousArgsAsync(any... args);
+
+  [Throws, WebExtensionStub="ReturnsPort"]
+  ExtensionPort methodReturnsPort(DOMString testName);
+
+  // Test API properties.
+
+  [Replaceable]
+  readonly attribute any propertyAsErrorObject;
+
+  [Replaceable]
+  readonly attribute DOMString propertyAsString;
+
+  // Test API events.
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onTestEvent;
+};
diff --git a/dom/webidl/ExtensionPort.webidl b/dom/webidl/ExtensionPort.webidl
new file mode 100644
index 0000000000..35fb60dea7
--- /dev/null
+++ b/dom/webidl/ExtensionPort.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ *
+ * This IDL file is related to the WebExtensions browser.runtime's Port.
+ *
+ * More info about generating webidl API bindings for WebExtensions API at:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ * A short summary of the special setup used by these WebIDL files (meant to aid
+ * webidl peers reviews and sign-offs) is available in the following section:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionPort {
+  [Replaceable]
+  readonly attribute DOMString name;
+  [Replaceable]
+  readonly attribute any sender;
+  [Replaceable]
+  readonly attribute any error;
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined disconnect();
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined postMessage(any message);
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onDisconnect;
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onMessage;
+};
+
+// Dictionary used by ExtensionAPIRequestForwarder and ExtensionCallabck to receive from the
+// mozIExtensionAPIRequestHandler an internal description of a runtime.Port (and then used in
+// the webidl implementation to create an ExtensionPort instance).
+[GenerateInit]
+dictionary ExtensionPortDescriptor {
+  required DOMString portId;
+  DOMString name = "";
+};
diff --git a/dom/webidl/ExtensionProxy.webidl b/dom/webidl/ExtensionProxy.webidl
new file mode 100644
index 0000000000..fa8dfcf041
--- /dev/null
+++ b/dom/webidl/ExtensionProxy.webidl
@@ -0,0 +1,38 @@
+/*
+ *  THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT
+ *
+ *  The content of this file has been generated based on the WebExtensions API
+ *  JSONSchema using the following command:
+ *
+ *  export SCRIPT_DIR="toolkit/components/extensions/webidl-api"
+ *  mach python $SCRIPT_DIR/GenerateWebIDLBindings.py -- proxy
+ *
+ *  More info about generating webidl API bindings for WebExtensions API at:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+// WebIDL definition for the "proxy" WebExtensions API
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionProxy {
+  // API events.
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onRequest;
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onError;
+
+  // API properties.
+
+  [Replaceable]
+  readonly attribute ExtensionSetting settings;
+};
diff --git a/dom/webidl/ExtensionRuntime.webidl b/dom/webidl/ExtensionRuntime.webidl
new file mode 100644
index 0000000000..c60f45c8f2
--- /dev/null
+++ b/dom/webidl/ExtensionRuntime.webidl
@@ -0,0 +1,102 @@
+/*
+ *  THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT
+ *
+ *  The content of this file has been generated based on the WebExtensions API
+ *  JSONSchema using the following command:
+ *
+ *  export SCRIPT_DIR="toolkit/components/extensions/webidl-api"
+ *  mach python $SCRIPT_DIR/GenerateWebIDLBindings.py -- runtime
+ *
+ *  More info about generating webidl API bindings for WebExtensions API at:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ *  A short summary of the special setup used by these WebIDL files (meant to aid
+ *  webidl peers reviews and sign-offs) is available in the following section:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+// WebIDL definition for the "runtime" WebExtensions API
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionRuntime {
+  // API methods.
+
+  [Throws, WebExtensionStub="Async"]
+  any openOptionsPage(optional Function callback);
+
+  [Throws, WebExtensionStub]
+  any getManifest();
+
+  [Throws, WebExtensionStub="ReturnsString"]
+  DOMString getURL(DOMString path);
+
+  [Throws, WebExtensionStub="Async"]
+  any setUninstallURL(DOMString url, optional Function callback);
+  [Throws, WebExtensionStub="Async"]
+  any setUninstallURL(optional Function callback);
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined reload();
+
+  [Throws, WebExtensionStub="ReturnsPort"]
+  ExtensionPort connect(DOMString extensionId, any connectInfo);
+  [Throws, WebExtensionStub="ReturnsPort"]
+  ExtensionPort connect(any connectInfo);
+  [Throws, WebExtensionStub="ReturnsPort"]
+  ExtensionPort connect();
+
+  [Throws, WebExtensionStub="ReturnsPort"]
+  ExtensionPort connectNative(DOMString application);
+
+  [Throws, WebExtensionStub="AsyncAmbiguous"]
+  any sendMessage(any... args);
+
+  [Throws, WebExtensionStub="Async"]
+  any sendNativeMessage(DOMString application, any message, optional Function responseCallback);
+
+  [Throws, WebExtensionStub="Async"]
+  any getBrowserInfo(optional Function callback);
+
+  [Throws, WebExtensionStub="Async"]
+  any getPlatformInfo(optional Function callback);
+
+  // API events.
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onStartup;
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onInstalled;
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onUpdateAvailable;
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onConnect;
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onConnectExternal;
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onMessage;
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onMessageExternal;
+
+  // API properties.
+
+  [Replaceable]
+  readonly attribute any lastError;
+
+  [Replaceable]
+  readonly attribute DOMString id;
+};
diff --git a/dom/webidl/ExtensionScripting.webidl b/dom/webidl/ExtensionScripting.webidl
new file mode 100644
index 0000000000..0bd4ed8235
--- /dev/null
+++ b/dom/webidl/ExtensionScripting.webidl
@@ -0,0 +1,53 @@
+/*
+ *  THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT
+ *
+ *  The content of this file has been generated based on the WebExtensions API
+ *  JSONSchema using the following command:
+ *
+ *  export SCRIPT_DIR="toolkit/components/extensions/webidl-api"
+ *  mach python $SCRIPT_DIR/GenerateWebIDLBindings.py -- scripting
+ *
+ *  More info about generating webidl API bindings for WebExtensions API at:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ *  A short summary of the special setup used by these WebIDL files (meant to aid
+ *  webidl peers reviews and sign-offs) is available in the following section:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+// WebIDL definition for the "scripting" WebExtensions API
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionScripting {
+  // API methods.
+
+  [Throws, WebExtensionStub="NotImplementedAsync"]
+  any executeScript(any injection, optional Function callback);
+
+  [Throws, WebExtensionStub="Async"]
+  any insertCSS(any injection, optional Function callback);
+
+  [Throws, WebExtensionStub="Async"]
+  any removeCSS(any injection, optional Function callback);
+
+  [Throws, WebExtensionStub="Async"]
+  any registerContentScripts(any scripts, optional Function callback);
+
+  [Throws, WebExtensionStub="AsyncAmbiguous"]
+  any getRegisteredContentScripts(any... args);
+
+  [Throws, WebExtensionStub="AsyncAmbiguous"]
+  any unregisterContentScripts(any... args);
+
+  [Throws, WebExtensionStub="Async"]
+  any updateContentScripts(any scripts, optional Function callback);
+};
diff --git a/dom/webidl/ExtensionSetting.webidl b/dom/webidl/ExtensionSetting.webidl
new file mode 100644
index 0000000000..578feb17ff
--- /dev/null
+++ b/dom/webidl/ExtensionSetting.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ *
+ * This IDL file is related to the WebExtensions API object.
+ *
+ * The ExtensionSetting interface is used by the API namespace that expose
+ * settings API sub-namespaces (in particular browserSettings, proxy,
+ * captivePortal and privacy WebExtensions APIs).
+ *
+ * More info about generating webidl API bindings for WebExtensions API at:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ * A short summary of the special setup used by these WebIDL files (meant to aid
+ * webidl peers reviews and sign-offs) is available in the following section:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionSetting {
+  // API methods.
+
+  [Throws, WebExtensionStub="Async"]
+  any get(object details, optional Function callback);
+
+  [Throws, WebExtensionStub="Async"]
+  any set(object details, optional Function callback);
+
+  [Throws, WebExtensionStub="Async"]
+  any clear(object details, optional Function callback);
+
+  // API events.
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onChange;
+};
diff --git a/dom/webidl/ExtensionTest.webidl b/dom/webidl/ExtensionTest.webidl
new file mode 100644
index 0000000000..8d70ce52e1
--- /dev/null
+++ b/dom/webidl/ExtensionTest.webidl
@@ -0,0 +1,86 @@
+/*
+ *  THIS IS AN AUTOGENERATED FILE.  DO NOT EDIT
+ *
+ *  The content of this file has been generated based on the WebExtensions API
+ *  JSONSchema using the following command:
+ *
+ *  export SCRIPT_DIR="toolkit/components/extensions/webidl-api"
+ *  mach python $SCRIPT_DIR/GenerateWebIDLBindings.py -- test
+ *
+ *  More info about generating webidl API bindings for WebExtensions API at:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ *  A short summary of the special setup used by these WebIDL files (meant to aid
+ *  webidl peers reviews and sign-offs) is available in the following section:
+ *
+ *  https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+// WebIDL definition for the "test" WebExtensions API
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionTest {
+  // API methods.
+
+  [Throws, WebExtensionStub="NotImplementedNoReturn"]
+  undefined withHandlingUserInput(Function callback);
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined notifyFail(DOMString message);
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined notifyPass(DOMString message);
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined notifyPass();
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined log(DOMString message);
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined sendMessage(any... args);
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined fail(any message);
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined fail();
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined succeed(any message);
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined succeed();
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined assertTrue(any... args);
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined assertFalse(any... args);
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined assertDeepEq(any... args);
+
+  [Throws, WebExtensionStub="AssertEq"]
+  undefined assertEq(any... args);
+
+  [Throws]
+  any assertRejects(Promise<any> promise, any expectedError, DOMString message, optional Function callback);
+  [Throws]
+  any assertRejects(Promise<any> promise, any expectedError, optional Function callback);
+
+  [Throws]
+  undefined assertThrows(Function func, any expectedError, DOMString message);
+  [Throws]
+  undefined assertThrows(Function func, any expectedError);
+
+  // API events.
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onMessage;
+};
diff --git a/dom/webidl/External.webidl b/dom/webidl/External.webidl
new file mode 100644
index 0000000000..a1d2de82d8
--- /dev/null
+++ b/dom/webidl/External.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[LegacyNoInterfaceObject, Exposed=Window]
+interface External {
+  [Deprecated="External_AddSearchProvider"]
+  undefined AddSearchProvider();
+  undefined IsSearchProviderInstalled();
+};
diff --git a/dom/webidl/FailedCertSecurityInfo.webidl b/dom/webidl/FailedCertSecurityInfo.webidl
new file mode 100644
index 0000000000..cdd0425d6a
--- /dev/null
+++ b/dom/webidl/FailedCertSecurityInfo.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * This dictionary is used for exposing failed channel certificate information
+ * to about:certerror to display information.
+ */
+
+enum OverridableErrorCategory {
+  "unset",
+  "trust-error",
+  "domain-mismatch",
+  "expired-or-not-yet-valid",
+};
+
+dictionary FailedCertSecurityInfo {
+  DOMString errorCodeString = "";
+  OverridableErrorCategory overridableErrorCategory = "unset";
+  DOMTimeStamp validNotBefore = 0;
+  DOMTimeStamp validNotAfter = 0;
+  DOMString issuerCommonName = "";
+  DOMTimeStamp certValidityRangeNotAfter = 0;
+  DOMTimeStamp certValidityRangeNotBefore = 0;
+  DOMString errorMessage = "";
+  boolean hasHSTS = true;
+  boolean hasHPKP = true;
+  sequence<DOMString> certChainStrings;
+};
diff --git a/dom/webidl/FakePluginTagInit.webidl b/dom/webidl/FakePluginTagInit.webidl
new file mode 100644
index 0000000000..aaa8ab617d
--- /dev/null
+++ b/dom/webidl/FakePluginTagInit.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * A fake plugin is fundamentally identified by its handlerURI.
+ *
+ * In addition to that, a fake plugin registration needs to provide at least one
+ * FakePluginMimeEntry so we'll know what types(s) the plugin is registered for.
+ * Other information is optional, though having usable niceName is highly
+ * recommended.
+ */
+[GenerateInit]
+dictionary FakePluginTagInit {
+  required DOMString handlerURI;
+  required sequence<FakePluginMimeEntry> mimeEntries;
+
+  // The niceName should really be provided, and be unique, if possible; it can
+  // be used as a key to persist state for this plug-in.
+  DOMString niceName = "";
+
+  // Other things can be provided but don't really matter that much.
+  DOMString fullPath = "";
+  DOMString name = "";
+  DOMString description = "";
+  DOMString fileName = "";
+  DOMString version = "";
+
+  /**
+   * Optional script to run in a sandbox when instantiating a plugin. The script
+   * runs in a sandbox with system principal in the process that contains the
+   * element that instantiates the plugin (ie the EMBED or OBJECT element). The
+   * sandbox global has a 'pluginElement' property that the script can use to
+   * access the element that instantiates the plugin.
+   */
+  DOMString sandboxScript = "";
+};
+
+/**
+ * A single MIME entry for the fake plugin.
+ */
+dictionary FakePluginMimeEntry {
+  required DOMString type;
+  DOMString description = "";
+  DOMString extension = "";
+};
diff --git a/dom/webidl/FeaturePolicy.webidl b/dom/webidl/FeaturePolicy.webidl
new file mode 100644
index 0000000000..18f683f202
--- /dev/null
+++ b/dom/webidl/FeaturePolicy.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://w3c.github.io/webappsec-feature-policy/#idl-index
+ */
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface FeaturePolicy {
+  boolean allowsFeature(DOMString feature, optional DOMString origin);
+  sequence<DOMString> features();
+  sequence<DOMString> allowedFeatures();
+  sequence<DOMString> getAllowlistForFeature(DOMString feature);
+};
+
+[Pref="dom.reporting.featurePolicy.enabled",
+ Exposed=Window]
+interface FeaturePolicyViolationReportBody : ReportBody {
+  readonly attribute DOMString featureId;
+  readonly attribute DOMString? sourceFile;
+  readonly attribute long? lineNumber;
+  readonly attribute long? columnNumber;
+  readonly attribute DOMString disposition;
+};
diff --git a/dom/webidl/Fetch.webidl b/dom/webidl/Fetch.webidl
new file mode 100644
index 0000000000..1a6eb90823
--- /dev/null
+++ b/dom/webidl/Fetch.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://fetch.spec.whatwg.org/
+ */
+
+typedef object JSON;
+typedef (Blob or BufferSource or FormData or URLSearchParams or USVString) XMLHttpRequestBodyInit;
+/* no support for request body streams yet */
+typedef XMLHttpRequestBodyInit BodyInit;
+
+interface mixin Body {
+  readonly attribute boolean bodyUsed;
+  [NewObject]
+  Promise<ArrayBuffer> arrayBuffer();
+  [NewObject]
+  Promise<Blob> blob();
+  [NewObject]
+  Promise<FormData> formData();
+  [NewObject]
+  Promise<JSON> json();
+  [NewObject]
+  Promise<USVString> text();
+};
+
+// These are helper dictionaries for the parsing of a
+// getReader().read().then(data) parsing.
+// See more about how these 2 helpers are used in
+// dom/fetch/FetchStreamReader.cpp
+[GenerateInit]
+dictionary FetchReadableStreamReadDataDone {
+  boolean done = false;
+};
+
+[GenerateInit]
+dictionary FetchReadableStreamReadDataArray {
+  Uint8Array value;
+};
diff --git a/dom/webidl/FetchEvent.webidl b/dom/webidl/FetchEvent.webidl
new file mode 100644
index 0000000000..9b8eee247f
--- /dev/null
+++ b/dom/webidl/FetchEvent.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ */
+
+[Func="ServiceWorkerVisible",
+ Exposed=(ServiceWorker)]
+interface FetchEvent : ExtendableEvent {
+  constructor(DOMString type, FetchEventInit eventInitDict);
+
+  [SameObject, BinaryName="request_"] readonly attribute Request request;
+  [Pref="dom.serviceWorkers.navigationPreload.enabled"]
+  readonly attribute Promise<any> preloadResponse;
+  readonly attribute DOMString clientId;
+  readonly attribute DOMString resultingClientId;
+  readonly attribute Promise<undefined> handled;
+
+  [Throws]
+  undefined respondWith(Promise<Response> r);
+};
+
+dictionary FetchEventInit : EventInit {
+  required Request request;
+  DOMString clientId = "";
+  DOMString resultingClientId = "";
+};
diff --git a/dom/webidl/FetchObserver.webidl b/dom/webidl/FetchObserver.webidl
new file mode 100644
index 0000000000..ccff51c789
--- /dev/null
+++ b/dom/webidl/FetchObserver.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+callback interface ObserverCallback {
+  undefined handleEvent(FetchObserver observer);
+};
+
+enum FetchState {
+  // Pending states
+  "requesting", "responding",
+  // Final states
+  "aborted", "errored", "complete"
+};
+
+[Exposed=(Window,Worker),
+ Pref="dom.fetchObserver.enabled"]
+interface FetchObserver : EventTarget {
+  readonly attribute FetchState state;
+
+  // Events
+  attribute EventHandler onstatechange;
+  attribute EventHandler onrequestprogress;
+  attribute EventHandler onresponseprogress;
+};
diff --git a/dom/webidl/File.webidl b/dom/webidl/File.webidl
new file mode 100644
index 0000000000..32cc9b7713
--- /dev/null
+++ b/dom/webidl/File.webidl
@@ -0,0 +1,60 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/FileAPI/#file
+ * https://wicg.github.io/entries-api
+ */
+
+interface nsIFile;
+
+[Exposed=(Window,Worker)]
+interface File : Blob {
+  [Throws]
+  constructor(sequence<BlobPart> fileBits,
+              USVString fileName, optional FilePropertyBag options = {});
+
+  readonly attribute DOMString name;
+
+  [GetterThrows]
+  readonly attribute long long lastModified;
+};
+
+dictionary FilePropertyBag : BlobPropertyBag {
+  long long lastModified;
+};
+
+dictionary ChromeFilePropertyBag : FilePropertyBag {
+  DOMString name = "";
+  boolean existenceCheck = true;
+};
+
+// https://wicg.github.io/entries-api
+partial interface File {
+  [BinaryName="relativePath", Pref="dom.webkitBlink.dirPicker.enabled"]
+  readonly attribute USVString webkitRelativePath;
+};
+
+// Mozilla extensions
+partial interface File {
+  [GetterThrows, ChromeOnly, NeedsCallerType]
+  readonly attribute DOMString mozFullPath;
+};
+
+// Mozilla extensions
+// These 2 methods can be used only in these conditions:
+// - the main-thread
+// - parent process OR file process OR, only for testing, with pref
+//   `dom.file.createInChild' set to true.
+[Exposed=(Window)]
+partial interface File {
+  [ChromeOnly, NewObject, NeedsCallerType]
+  static Promise<File> createFromNsIFile(nsIFile file,
+                                         optional ChromeFilePropertyBag options = {});
+
+  [ChromeOnly, NewObject, NeedsCallerType]
+  static Promise<File> createFromFileName(USVString fileName,
+                                          optional ChromeFilePropertyBag options = {});
+};
diff --git a/dom/webidl/FileList.webidl b/dom/webidl/FileList.webidl
new file mode 100644
index 0000000000..5e4590347b
--- /dev/null
+++ b/dom/webidl/FileList.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2006/webapi/FileAPI/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface FileList {
+  getter File? item(unsigned long index);
+  readonly attribute unsigned long length;
+};
diff --git a/dom/webidl/FileMode.webidl b/dom/webidl/FileMode.webidl
new file mode 100644
index 0000000000..788c2c9bf0
--- /dev/null
+++ b/dom/webidl/FileMode.webidl
@@ -0,0 +1,5 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum FileMode { "readonly", "readwrite" };
diff --git a/dom/webidl/FileReader.webidl b/dom/webidl/FileReader.webidl
new file mode 100644
index 0000000000..f4dfeffb12
--- /dev/null
+++ b/dom/webidl/FileReader.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/FileAPI/#APIASynch
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface FileReader : EventTarget {
+  constructor();
+
+  // async read methods
+  [Throws]
+  undefined readAsArrayBuffer(Blob blob);
+  [Throws]
+  undefined readAsBinaryString(Blob filedata);
+  [Throws]
+  undefined readAsText(Blob blob, optional DOMString label);
+  [Throws]
+  undefined readAsDataURL(Blob blob);
+
+  undefined abort();
+
+  // states
+  const unsigned short EMPTY = 0;
+  const unsigned short LOADING = 1;
+  const unsigned short DONE = 2;
+
+
+  readonly attribute unsigned short readyState;
+
+  readonly attribute (DOMString or ArrayBuffer)? result;
+
+  readonly attribute DOMException? error;
+
+  // event handler attributes
+  attribute EventHandler onloadstart;
+  attribute EventHandler onprogress;
+  attribute EventHandler onload;
+  attribute EventHandler onabort;
+  attribute EventHandler onerror;
+  attribute EventHandler onloadend;
+};
diff --git a/dom/webidl/FileReaderSync.webidl b/dom/webidl/FileReaderSync.webidl
new file mode 100644
index 0000000000..67a831c990
--- /dev/null
+++ b/dom/webidl/FileReaderSync.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2006/webapi/FileAPI/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(DedicatedWorker,SharedWorker)]
+interface FileReaderSync {
+  constructor();
+
+  // Synchronously return strings
+
+  [Throws]
+  ArrayBuffer readAsArrayBuffer(Blob blob);
+  [Throws]
+  DOMString readAsBinaryString(Blob blob);
+  [Throws]
+  DOMString readAsText(Blob blob, optional DOMString encoding);
+  [Throws]
+  DOMString readAsDataURL(Blob blob);
+};
diff --git a/dom/webidl/FileSystem.webidl b/dom/webidl/FileSystem.webidl
new file mode 100644
index 0000000000..ba62b1ce80
--- /dev/null
+++ b/dom/webidl/FileSystem.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://wicg.github.io/entries-api/#idl-index
+ */
+
+dictionary FileSystemFlags {
+    boolean create = false;
+    boolean exclusive = false;
+};
+
+callback FileSystemEntryCallback = undefined (FileSystemEntry entry);
+
+callback ErrorCallback = undefined (DOMException err);
+
+[Exposed=Window]
+interface FileSystem {
+    readonly    attribute USVString name;
+    readonly    attribute FileSystemDirectoryEntry root;
+};
diff --git a/dom/webidl/FileSystemDirectoryEntry.webidl b/dom/webidl/FileSystemDirectoryEntry.webidl
new file mode 100644
index 0000000000..8168393cd6
--- /dev/null
+++ b/dom/webidl/FileSystemDirectoryEntry.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://wicg.github.io/entries-api/#idl-index
+ */
+
+[Exposed=Window]
+interface FileSystemDirectoryEntry : FileSystemEntry {
+    FileSystemDirectoryReader createReader();
+
+    undefined getFile(optional USVString? path,
+                      optional FileSystemFlags options = {},
+                      optional FileSystemEntryCallback successCallback,
+                      optional ErrorCallback errorCallback);
+
+    undefined getDirectory(optional USVString? path,
+                           optional FileSystemFlags options = {},
+                           optional FileSystemEntryCallback successCallback,
+                           optional ErrorCallback errorCallback);
+};
diff --git a/dom/webidl/FileSystemDirectoryHandle.webidl b/dom/webidl/FileSystemDirectoryHandle.webidl
new file mode 100644
index 0000000000..24a84db7d1
--- /dev/null
+++ b/dom/webidl/FileSystemDirectoryHandle.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+dictionary FileSystemGetFileOptions {
+  boolean create = false;
+};
+
+dictionary FileSystemGetDirectoryOptions {
+  boolean create = false;
+};
+
+dictionary FileSystemRemoveOptions {
+  boolean recursive = false;
+};
+
+[Exposed=(Window,Worker), SecureContext, Serializable, Pref="dom.fs.enabled"]
+interface FileSystemDirectoryHandle : FileSystemHandle {
+
+  async iterable<USVString, FileSystemHandle>;
+
+  [NewObject]
+  Promise<FileSystemFileHandle> getFileHandle(USVString name, optional FileSystemGetFileOptions options = {});
+
+  [NewObject]
+  Promise<FileSystemDirectoryHandle> getDirectoryHandle(USVString name, optional FileSystemGetDirectoryOptions options = {});
+
+  [NewObject]
+  Promise<undefined> removeEntry(USVString name, optional FileSystemRemoveOptions options = {});
+
+  [NewObject]
+  Promise<sequence<USVString>?> resolve(FileSystemHandle possibleDescendant);
+};
diff --git a/dom/webidl/FileSystemDirectoryIterator.webidl b/dom/webidl/FileSystemDirectoryIterator.webidl
new file mode 100644
index 0000000000..0b1b72b1aa
--- /dev/null
+++ b/dom/webidl/FileSystemDirectoryIterator.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// To implement FileSystemDirectoryHandle's async iteration until we can use
+// a natively supported `async iterable`.
+[Exposed=(Window,Worker), SecureContext, LegacyNoInterfaceObject]
+interface FileSystemDirectoryIterator {
+  [NewObject]
+  Promise<any> next();
+};
diff --git a/dom/webidl/FileSystemDirectoryReader.webidl b/dom/webidl/FileSystemDirectoryReader.webidl
new file mode 100644
index 0000000000..024b1294b5
--- /dev/null
+++ b/dom/webidl/FileSystemDirectoryReader.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://wicg.github.io/entries-api/#idl-index
+ */
+
+callback FileSystemEntriesCallback = undefined (sequence<FileSystemEntry> entries);
+
+[Exposed=Window]
+interface FileSystemDirectoryReader {
+
+    // readEntries can be called just once. The second time it returns no data.
+
+    [Throws]
+    undefined readEntries(FileSystemEntriesCallback successCallback,
+                          optional ErrorCallback errorCallback);
+};
diff --git a/dom/webidl/FileSystemEntry.webidl b/dom/webidl/FileSystemEntry.webidl
new file mode 100644
index 0000000000..edf29e3861
--- /dev/null
+++ b/dom/webidl/FileSystemEntry.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://wicg.github.io/entries-api/#idl-index
+ */
+
+[Exposed=Window]
+interface FileSystemEntry {
+    readonly attribute boolean isFile;
+    readonly attribute boolean isDirectory;
+
+    [GetterThrows]
+    readonly attribute USVString name;
+
+    [GetterThrows]
+    readonly attribute USVString fullPath;
+
+    readonly attribute FileSystem filesystem;
+
+    undefined getParent(optional FileSystemEntryCallback successCallback,
+                        optional ErrorCallback errorCallback);
+};
diff --git a/dom/webidl/FileSystemFileEntry.webidl b/dom/webidl/FileSystemFileEntry.webidl
new file mode 100644
index 0000000000..2d0069896a
--- /dev/null
+++ b/dom/webidl/FileSystemFileEntry.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://wicg.github.io/entries-api/#idl-index
+ */
+
+callback FileCallback = undefined (File file);
+
+[Exposed=Window]
+interface FileSystemFileEntry : FileSystemEntry {
+    [BinaryName="GetFile"]
+    undefined file (FileCallback successCallback,
+                    optional ErrorCallback errorCallback);
+};
diff --git a/dom/webidl/FileSystemFileHandle.webidl b/dom/webidl/FileSystemFileHandle.webidl
new file mode 100644
index 0000000000..39598c7c42
--- /dev/null
+++ b/dom/webidl/FileSystemFileHandle.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+dictionary FileSystemCreateWritableOptions {
+  boolean keepExistingData = false;
+};
+
+[Exposed=(Window,Worker), SecureContext, Serializable, Pref="dom.fs.enabled"]
+interface FileSystemFileHandle : FileSystemHandle {
+  [NewObject]
+  Promise<File> getFile();
+
+  [NewObject]
+  Promise<FileSystemWritableFileStream> createWritable(optional FileSystemCreateWritableOptions options = {});
+
+  [Exposed=DedicatedWorker, NewObject]
+  Promise<FileSystemSyncAccessHandle> createSyncAccessHandle();
+};
diff --git a/dom/webidl/FileSystemHandle.webidl b/dom/webidl/FileSystemHandle.webidl
new file mode 100644
index 0000000000..4dbbab983b
--- /dev/null
+++ b/dom/webidl/FileSystemHandle.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum FileSystemHandleKind {
+  "file",
+  "directory",
+};
+
+[Exposed=(Window,Worker), SecureContext, Serializable, Pref="dom.fs.enabled"]
+interface FileSystemHandle {
+  readonly attribute FileSystemHandleKind kind;
+  readonly attribute USVString name;
+
+  /* https://whatpr.org/fs/10.html#api-filesystemhandle */
+  [NewObject]
+  Promise<undefined> move(USVString name);
+  [NewObject]
+  Promise<undefined> move(FileSystemDirectoryHandle parent);
+  [NewObject]
+  Promise<undefined> move(FileSystemDirectoryHandle parent, USVString name);
+
+  [NewObject]
+  Promise<boolean> isSameEntry(FileSystemHandle other);
+};
diff --git a/dom/webidl/FileSystemSyncAccessHandle.webidl b/dom/webidl/FileSystemSyncAccessHandle.webidl
new file mode 100644
index 0000000000..343f0798bf
--- /dev/null
+++ b/dom/webidl/FileSystemSyncAccessHandle.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+dictionary FileSystemReadWriteOptions {
+  [EnforceRange] unsigned long long at;
+};
+
+[Exposed=(DedicatedWorker), SecureContext, Pref="dom.fs.enabled"]
+interface FileSystemSyncAccessHandle {
+  // TODO: Use `[AllowShared] BufferSource data` once it works (bug 1696216)
+  [Throws] unsigned long long read(([AllowShared] ArrayBufferView or [AllowShared] ArrayBuffer) buffer, optional FileSystemReadWriteOptions options = {});
+  [Throws] unsigned long long write(([AllowShared] ArrayBufferView or [AllowShared] ArrayBuffer) buffer, optional FileSystemReadWriteOptions options = {});
+
+  [Throws] undefined truncate([EnforceRange] unsigned long long size);
+  [Throws] unsigned long long getSize();
+  [Throws] undefined flush();
+  undefined close();
+};
diff --git a/dom/webidl/FileSystemWritableFileStream.webidl b/dom/webidl/FileSystemWritableFileStream.webidl
new file mode 100644
index 0000000000..a6c2552cb6
--- /dev/null
+++ b/dom/webidl/FileSystemWritableFileStream.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum WriteCommandType {
+  "write",
+  "seek",
+  "truncate"
+};
+
+[GenerateConversionToJS]
+dictionary WriteParams {
+  required WriteCommandType type;
+  unsigned long long? size;
+  unsigned long long? position;
+  (BufferSource or Blob or UTF8String)? data;
+};
+
+typedef (BufferSource or Blob or UTF8String or WriteParams) FileSystemWriteChunkType;
+
+[Exposed=(Window,Worker), SecureContext, Pref="dom.fs.enabled"]
+interface FileSystemWritableFileStream : WritableStream {
+  [NewObject, Throws]
+  Promise<undefined> write(FileSystemWriteChunkType data);
+  [NewObject]
+  Promise<undefined> seek(unsigned long long position);
+  [NewObject]
+  Promise<undefined> truncate(unsigned long long size);
+};
diff --git a/dom/webidl/FinalizationRegistry.webidl b/dom/webidl/FinalizationRegistry.webidl
new file mode 100644
index 0000000000..2331426c51
--- /dev/null
+++ b/dom/webidl/FinalizationRegistry.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This IDL file contains a callback used to integrate JS FinalizationRegistry
+ * objects with the browser.
+ */
+
+callback FinalizationRegistryCleanupCallback = undefined();
diff --git a/dom/webidl/FocusEvent.webidl b/dom/webidl/FocusEvent.webidl
new file mode 100644
index 0000000000..00ae719d4d
--- /dev/null
+++ b/dom/webidl/FocusEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface FocusEvent : UIEvent {
+  constructor(DOMString typeArg,
+              optional FocusEventInit focusEventInitDict = {});
+
+  // Introduced in DOM Level 3:
+  readonly attribute EventTarget?   relatedTarget;
+};
+
+dictionary FocusEventInit : UIEventInit {
+    EventTarget? relatedTarget = null;
+};
diff --git a/dom/webidl/FontFace.webidl b/dom/webidl/FontFace.webidl
new file mode 100644
index 0000000000..8106388032
--- /dev/null
+++ b/dom/webidl/FontFace.webidl
@@ -0,0 +1,63 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-font-loading/#fontface-interface
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+typedef (ArrayBuffer or ArrayBufferView) BinaryData;
+
+dictionary FontFaceDescriptors {
+  UTF8String style = "normal";
+  UTF8String weight = "normal";
+  UTF8String stretch = "normal";
+  UTF8String unicodeRange = "U+0-10FFFF";
+  UTF8String variant = "normal";
+  UTF8String featureSettings = "normal";
+  [Pref="layout.css.font-variations.enabled"] UTF8String variationSettings = "normal";
+  [Pref="layout.css.font-display.enabled"] UTF8String display = "auto";
+  [Pref="layout.css.font-metrics-overrides.enabled"] UTF8String ascentOverride = "normal";
+  [Pref="layout.css.font-metrics-overrides.enabled"] UTF8String descentOverride = "normal";
+  [Pref="layout.css.font-metrics-overrides.enabled"] UTF8String lineGapOverride = "normal";
+  [Pref="layout.css.size-adjust.enabled"] UTF8String sizeAdjust = "100%";
+};
+
+enum FontFaceLoadStatus { "unloaded", "loading", "loaded", "error" };
+
+// Bug 1072107 is for exposing this in workers.
+// [Exposed=(Window,Worker)]
+[Func="FontFaceSet::IsEnabled",
+ Exposed=(Window,Worker)]
+interface FontFace {
+  [Throws]
+  constructor(UTF8String family,
+              (UTF8String or BinaryData) source,
+              optional FontFaceDescriptors descriptors = {});
+
+  [SetterThrows] attribute UTF8String family;
+  [SetterThrows] attribute UTF8String style;
+  [SetterThrows] attribute UTF8String weight;
+  [SetterThrows] attribute UTF8String stretch;
+  [SetterThrows] attribute UTF8String unicodeRange;
+  [SetterThrows] attribute UTF8String variant;
+  [SetterThrows] attribute UTF8String featureSettings;
+  [SetterThrows, Pref="layout.css.font-variations.enabled"] attribute UTF8String variationSettings;
+  [SetterThrows, Pref="layout.css.font-display.enabled"] attribute UTF8String display;
+  [SetterThrows, Pref="layout.css.font-metrics-overrides.enabled"] attribute UTF8String ascentOverride;
+  [SetterThrows, Pref="layout.css.font-metrics-overrides.enabled"] attribute UTF8String descentOverride;
+  [SetterThrows, Pref="layout.css.font-metrics-overrides.enabled"] attribute UTF8String lineGapOverride;
+  [SetterThrows, Pref="layout.css.size-adjust.enabled"] attribute UTF8String sizeAdjust;
+
+  readonly attribute FontFaceLoadStatus status;
+
+  [Throws]
+  Promise<FontFace> load();
+
+  [Throws]
+  readonly attribute Promise<FontFace> loaded;
+};
diff --git a/dom/webidl/FontFaceSet.webidl b/dom/webidl/FontFaceSet.webidl
new file mode 100644
index 0000000000..e873e87dd5
--- /dev/null
+++ b/dom/webidl/FontFaceSet.webidl
@@ -0,0 +1,66 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-font-loading/#FontFaceSet-interface
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// To implement FontFaceSet's iterator until we can use setlike.
+dictionary FontFaceSetIteratorResult
+{
+  required any value;
+  required boolean done;
+};
+
+// To implement FontFaceSet's iterator until we can use setlike.
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface FontFaceSetIterator {
+  [Throws] FontFaceSetIteratorResult next();
+};
+
+callback FontFaceSetForEachCallback = undefined (FontFace value, FontFace key, FontFaceSet set);
+
+enum FontFaceSetLoadStatus { "loading", "loaded" };
+
+[Func="FontFaceSet::IsEnabled",
+ Exposed=(Window,Worker)]
+interface FontFaceSet : EventTarget {
+  // Bug 1072762 is for the FontFaceSet constructor.
+  // constructor(sequence<FontFace> initialFaces);
+
+  // Emulate setlike behavior until we can use that directly.
+  readonly attribute unsigned long size;
+  [Throws] undefined add(FontFace font);
+  boolean has(FontFace font);
+  boolean delete(FontFace font);
+  undefined clear();
+  [NewObject] FontFaceSetIterator entries();
+  // Iterator keys();
+  [NewObject, Alias=keys, Alias="@@iterator"] FontFaceSetIterator values();
+  [Throws] undefined forEach(FontFaceSetForEachCallback cb, optional any thisArg);
+
+  // -- events for when loading state changes
+  attribute EventHandler onloading;
+  attribute EventHandler onloadingdone;
+  attribute EventHandler onloadingerror;
+
+  // check and start loads if appropriate
+  // and fulfill promise when all loads complete
+  [NewObject] Promise<sequence<FontFace>> load(UTF8String font, optional DOMString text = " ");
+
+  // return whether all fonts in the fontlist are loaded
+  // (does not initiate load if not available)
+  [Throws] boolean check(UTF8String font, optional DOMString text = " ");
+
+  // async notification that font loading and layout operations are done
+  [Throws] readonly attribute Promise<undefined> ready;
+
+  // loading state, "loading" while one or more fonts loading, "loaded" otherwise
+  readonly attribute FontFaceSetLoadStatus status;
+};
diff --git a/dom/webidl/FontFaceSetLoadEvent.webidl b/dom/webidl/FontFaceSetLoadEvent.webidl
new file mode 100644
index 0000000000..11d4b65646
--- /dev/null
+++ b/dom/webidl/FontFaceSetLoadEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-font-loading/#FontFaceSet-interface
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary FontFaceSetLoadEventInit : EventInit {
+  sequence<FontFace> fontfaces = [];
+};
+
+[Func="FontFaceSet::IsEnabled",
+ Exposed=(Window,Worker)]
+interface FontFaceSetLoadEvent : Event {
+  constructor(DOMString type,
+              optional FontFaceSetLoadEventInit eventInitDict = {});
+
+  [Cached, Constant, Frozen] readonly attribute sequence<FontFace> fontfaces;
+};
diff --git a/dom/webidl/FontFaceSource.webidl b/dom/webidl/FontFaceSource.webidl
new file mode 100644
index 0000000000..6cb43f0b0c
--- /dev/null
+++ b/dom/webidl/FontFaceSource.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/css-font-loading/#font-face-source
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin FontFaceSource {
+  [Func="FontFaceSet::IsEnabled", Throws]
+  readonly attribute FontFaceSet fonts;
+};
diff --git a/dom/webidl/FormData.webidl b/dom/webidl/FormData.webidl
new file mode 100644
index 0000000000..360b03aea4
--- /dev/null
+++ b/dom/webidl/FormData.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://xhr.spec.whatwg.org
+ */
+
+typedef (Blob or Directory or USVString) FormDataEntryValue;
+
+[Exposed=(Window,Worker)]
+interface FormData {
+  [Throws]
+  constructor(optional HTMLFormElement form, optional HTMLElement? submitter = null);
+
+  [Throws]
+  undefined append(USVString name, Blob value, optional USVString filename);
+  [Throws]
+  undefined append(USVString name, USVString value);
+  undefined delete(USVString name);
+  FormDataEntryValue? get(USVString name);
+  sequence<FormDataEntryValue> getAll(USVString name);
+  boolean has(USVString name);
+  [Throws]
+  undefined set(USVString name, Blob value, optional USVString filename);
+  [Throws]
+  undefined set(USVString name, USVString value);
+  iterable<USVString, FormDataEntryValue>;
+};
diff --git a/dom/webidl/FormDataEvent.webidl b/dom/webidl/FormDataEvent.webidl
new file mode 100644
index 0000000000..100e21c75e
--- /dev/null
+++ b/dom/webidl/FormDataEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#the-formdataevent-interface
+ */
+
+[Exposed=Window]
+interface FormDataEvent : Event {
+  constructor(DOMString type, optional FormDataEventInit eventInitDict = {});
+
+  // C++ can't deal with a method called FormData() in the generated code
+  [BinaryName="GetFormData"]
+  readonly attribute FormData formData;
+};
+
+dictionary FormDataEventInit : EventInit {
+  required FormData formData;
+};
diff --git a/dom/webidl/FrameCrashedEvent.webidl b/dom/webidl/FrameCrashedEvent.webidl
new file mode 100644
index 0000000000..b6d88f2757
--- /dev/null
+++ b/dom/webidl/FrameCrashedEvent.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly,
+ Exposed=Window]
+interface FrameCrashedEvent : Event
+{
+  constructor(DOMString type,
+              optional FrameCrashedEventInit eventInitDict = {});
+
+  /**
+   * The browsingContextId of the frame that crashed.
+   */
+  readonly attribute unsigned long long browsingContextId;
+
+  /**
+   * True if the top-most frame crashed.
+   */
+  readonly attribute boolean isTopFrame;
+
+  /**
+   * Internal process identifier of the frame that crashed. This will be
+   * 0 if this identifier is not known, for example a process that failed
+   * to start.
+   */
+  readonly attribute unsigned long long childID;
+};
+
+dictionary FrameCrashedEventInit : EventInit
+{
+  unsigned long long browsingContextId = 0;
+  boolean isTopFrame = true;
+  unsigned long long childID = 0;
+};
diff --git a/dom/webidl/Function.webidl b/dom/webidl/Function.webidl
new file mode 100644
index 0000000000..a27f3e6334
--- /dev/null
+++ b/dom/webidl/Function.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#functiocn
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+callback Function = any(any... arguments);
+
+callback VoidFunction = undefined ();
diff --git a/dom/webidl/FuzzingFunctions.webidl b/dom/webidl/FuzzingFunctions.webidl
new file mode 100644
index 0000000000..adbd19649e
--- /dev/null
+++ b/dom/webidl/FuzzingFunctions.webidl
@@ -0,0 +1,135 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * Various functions useful for automated fuzzing that are enabled
+ * only in --enable-fuzzing builds, because they may be dangerous to
+ * enable on untrusted pages.
+*/
+
+[Pref="fuzzing.enabled",
+ Exposed=Window]
+interface FuzzingFunctions {
+  /**
+   * Synchronously perform a garbage collection.
+   */
+  static undefined garbageCollect();
+
+  /**
+   * Synchronously perform a compacting garbage collection.
+   */
+  static undefined garbageCollectCompacting();
+
+  /**
+   * Trigger a forced crash.
+   */
+  static undefined crash(optional DOMString reason = "");
+
+  /**
+   * Synchronously perform a cycle collection.
+   */
+  static undefined cycleCollect();
+
+  /**
+   * Send a memory pressure event, causes shrinking GC, cycle collection and
+   * other actions.
+   */
+  static undefined memoryPressure();
+
+  /**
+   * Enable accessibility.
+   */
+  [Throws]
+  static undefined enableAccessibility();
+
+  /**
+   * Send IPC fuzzing ready event to parent.
+   */
+  static undefined signalIPCReady();
+
+  /**
+   * synthesizeKeyboardEvents() synthesizes a set of "keydown",
+   * "keypress" (only when it's necessary) and "keyup" events in top DOM window
+   * in current process (and the synthesized events will be retargeted to
+   * focused window/document/element).  I.e, this is currently not dispatched
+   * via the main process if you call this in a content process.  Therefore, in
+   * the case, some default action handlers which are only in the main process
+   * will never run.  Note that this does not allow to synthesize keyboard
+   * events if this is called from a keyboard event or composition event
+   * listener.
+   *
+   * @param aKeyValue          If you want to synthesize non-printable key
+   *                           events, you need to set one of key values
+   *                           defined by "UI Events KeyboardEvent key Values".
+   *                           You can check our current support values in
+   *                           dom/events/KeyNameList.h
+   *                           If you want to synthesize printable key events,
+   *                           you can set any string value including empty
+   *                           string.
+   *                           Note that |key| value in aDictionary is always
+   *                           ignored.
+   * @param aDictionary        If you want to synthesize simple key press
+   *                           without any modifiers, you can omit this.
+   *                           Otherwise, specify this with proper values.
+   *                           If |code| is omitted or empty string, this
+   *                           guesses proper code value in US-English
+   *                           keyboard.  Otherwise, the value must be empty
+   *                           string or known code value defined by "UI Events
+   *                           KeyboardEvent code Values".  You can check our
+   *                           current support values in
+   *                           dom/events/PhysicalKeyCodeNameList.h.
+   *                           If |keyCode| is omitted or 0, this guesses
+   *                           proper keyCode value in US-English keyboard.
+   *                           If |location| is omitted or 0, this assumes
+   *                           that left modifier key is pressed if aKeyValue
+   *                           is one of such modifier keys.
+   *                           |key|, |isComposing|, |charCode| and |which|
+   *                           are always ignored.
+   *                           Modifier states like |shiftKey|, |altKey|,
+   *                           |modifierAltGraph|, |modifierCapsLock| and
+   *                           |modifierNumLock| are not adjusted for
+   *                           aKeyValue.  Please specify them manually if
+   *                           necessary.
+   *                           Note that this API does not allow to dispatch
+   *                           known key events with empty |code| value and
+   *                           0 |keyCode| value since it's unsual situation
+   *                           especially 0 |keyCode| value with known key.
+   *                           Note that when you specify only one of |code|
+   *                           and |keyCode| value, the other will be guessed
+   *                           from US-English keyboard layout.  So, if you
+   *                           want to emulate key press with another keyboard
+   *                           layout, you should specify both values.
+   *
+   * For example:
+   *   // Synthesize "Tab" key events.
+   *   synthesizeKeyboardEvents("Tab");
+   *   // Synthesize Shift + Tab key events.
+   *   synthesizeKeyboardEvents("Tab", { shiftKey: true });
+   *   // Synthesize Control + A key events.
+   *   synthesizeKeyboardEvents("a", { controlKey: true });
+   *   // Synthesize Control + Shift + A key events.
+   *   synthesizeKeyboardEvents("A", { controlKey: true,
+   *                                   shitKey: true });
+   *   // Synthesize "Enter" key on numpad.
+   *   synthesizeKeyboardEvents("Enter", { code: "NumpadEnter" });
+   *   // Synthesize right "Shift" key.
+   *   synthesizeKeyboardEvents("Shift", { code: "ShiftRight" });
+   *   // Synthesize "1" on numpad.
+   *   synthesizeKeyboardEvents("1", { code: "Numpad1",
+   *                                   modifierNumLock: true });
+   *   // Synthesize "End" on numpad.
+   *   synthesizeKeyboardEvents("End", { code: "Numpad1" });
+   *   // Synthesize "%" key of US-English keyboard layout.
+   *   synthesizeKeyboardEvents("%", { shiftKey: true });
+   *   // Synthesize "*" key of Japanese keyboard layout.
+   *   synthesizeKeyboardEvents("*", { code: "Quote",
+   *                                   shiftKey: true,
+   *                                   keyCode: KeyboardEvent.DOM_VK_COLON });
+   */
+  [Throws]
+  static undefined synthesizeKeyboardEvents(DOMString aKeyValue,
+                                            optional KeyboardEventInit aDictionary = {});
+};
diff --git a/dom/webidl/GPUUncapturedErrorEvent.webidl b/dom/webidl/GPUUncapturedErrorEvent.webidl
new file mode 100644
index 0000000000..4cf5b2ce6a
--- /dev/null
+++ b/dom/webidl/GPUUncapturedErrorEvent.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://gpuweb.github.io/gpuweb/
+ */
+
+dictionary GPUUncapturedErrorEventInit : EventInit {
+    required GPUError error;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker*/), SecureContext]
+interface GPUUncapturedErrorEvent: Event {
+    constructor(DOMString type, GPUUncapturedErrorEventInit gpuUncapturedErrorEventInitDict);
+    readonly attribute GPUError error;
+};
diff --git a/dom/webidl/GainNode.webidl b/dom/webidl/GainNode.webidl
new file mode 100644
index 0000000000..3f0e171a25
--- /dev/null
+++ b/dom/webidl/GainNode.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary GainOptions : AudioNodeOptions {
+             float gain = 1.0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface GainNode : AudioNode {
+    [Throws]
+    constructor(BaseAudioContext context, optional GainOptions options = {});
+
+    readonly attribute AudioParam gain;
+
+};
+
+// Mozilla extension
+GainNode includes AudioNodePassThrough;
diff --git a/dom/webidl/Gamepad.webidl b/dom/webidl/Gamepad.webidl
new file mode 100644
index 0000000000..a8ec894441
--- /dev/null
+++ b/dom/webidl/Gamepad.webidl
@@ -0,0 +1,114 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/gamepad/
+ * https://w3c.github.io/gamepad/extensions.html
+ * https://w3c.github.io/webvr/spec/1.1/#interface-gamepad
+ */
+
+[Pref="dom.gamepad.enabled",
+ Exposed=Window,
+ SecureContext]
+interface GamepadButton {
+  readonly    attribute boolean pressed;
+  readonly    attribute boolean touched;
+  readonly    attribute double  value;
+};
+
+enum GamepadHand {
+  "",
+  "left",
+  "right"
+};
+
+/**
+ * https://www.w3.org/TR/gamepad/#gamepadmappingtype-enum
+ * https://immersive-web.github.io/webxr-gamepads-module/#enumdef-gamepadmappingtype
+ */
+enum GamepadMappingType {
+  "",
+  "standard",
+  "xr-standard"
+};
+
+[Pref="dom.gamepad.enabled",
+ Exposed=Window,
+ SecureContext]
+interface Gamepad {
+  /**
+   * An identifier, unique per type of device.
+   */
+  readonly attribute DOMString id;
+
+  /**
+   * The game port index for the device. Unique per device
+   * attached to this system.
+   */
+  readonly attribute long index;
+
+  /**
+   * The mapping in use for this device. The empty string
+   * indicates that no mapping is in use.
+   */
+  readonly attribute GamepadMappingType mapping;
+
+  /**
+   * The hand in use for this device. The empty string
+   * indicates that unknown, both hands, or not applicable
+   */
+  [Pref="dom.gamepad.extensions.enabled"]
+  readonly attribute GamepadHand hand;
+
+  /**
+   * The displayId in use for as an association point in the VRDisplay API
+   * to identify which VRDisplay that the gamepad is associated with.
+   */
+  [Pref="dom.vr.enabled"]
+  readonly attribute unsigned long displayId;
+
+  /**
+   * true if this gamepad is currently connected to the system.
+   */
+  readonly attribute boolean connected;
+
+  /**
+   * The current state of all buttons on the device, an
+   * array of GamepadButton.
+   */
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<GamepadButton> buttons;
+
+  /**
+   * The current position of all axes on the device, an
+   * array of doubles.
+   */
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<double> axes;
+
+  /**
+   * Timestamp from when the data of this device was last updated.
+   */
+  readonly attribute DOMHighResTimeStamp timestamp;
+
+  /**
+   * The current pose of the device, a GamepadPose.
+   */
+  [Pref="dom.gamepad.extensions.enabled"]
+  readonly attribute GamepadPose? pose;
+
+  /**
+   * The current haptic actuator of the device, an array of
+   * GamepadHapticActuator.
+   */
+  [Constant, Cached, Frozen, Pref="dom.gamepad.extensions.enabled"]
+  readonly attribute sequence<GamepadHapticActuator> hapticActuators;
+
+  [Constant, Cached, Frozen, Pref="dom.gamepad.extensions.enabled", Pref="dom.gamepad.extensions.lightindicator"]
+  readonly attribute sequence<GamepadLightIndicator> lightIndicators;
+
+  [Constant, Cached, Frozen, Pref="dom.gamepad.extensions.enabled", Pref="dom.gamepad.extensions.multitouch"]
+  readonly attribute sequence<GamepadTouch> touchEvents;
+};
diff --git a/dom/webidl/GamepadAxisMoveEvent.webidl b/dom/webidl/GamepadAxisMoveEvent.webidl
new file mode 100644
index 0000000000..6ccdeabf71
--- /dev/null
+++ b/dom/webidl/GamepadAxisMoveEvent.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="dom.gamepad.non_standard_events.enabled",
+ Exposed=Window, SecureContext]
+interface GamepadAxisMoveEvent : GamepadEvent
+{
+  constructor(DOMString type,
+              optional GamepadAxisMoveEventInit eventInitDict = {});
+
+  readonly attribute unsigned long axis;
+  readonly attribute double value;
+};
+
+dictionary GamepadAxisMoveEventInit : GamepadEventInit
+{
+  unsigned long axis = 0;
+  double value = 0;
+};
diff --git a/dom/webidl/GamepadButtonEvent.webidl b/dom/webidl/GamepadButtonEvent.webidl
new file mode 100644
index 0000000000..02bc4fb010
--- /dev/null
+++ b/dom/webidl/GamepadButtonEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="dom.gamepad.non_standard_events.enabled",
+ Exposed=Window,
+ SecureContext]
+interface GamepadButtonEvent : GamepadEvent
+{
+  constructor(DOMString type,
+              optional GamepadButtonEventInit eventInitDict = {});
+
+  readonly attribute unsigned long button;
+};
+
+dictionary GamepadButtonEventInit : GamepadEventInit
+{
+  unsigned long button = 0;
+};
diff --git a/dom/webidl/GamepadEvent.webidl b/dom/webidl/GamepadEvent.webidl
new file mode 100644
index 0000000000..be2ad9ec10
--- /dev/null
+++ b/dom/webidl/GamepadEvent.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/gamepad/#gamepadevent-interface
+ */
+
+[Pref="dom.gamepad.enabled",
+ Exposed=Window,
+ SecureContext]
+interface GamepadEvent : Event
+{
+  constructor(DOMString type, optional GamepadEventInit eventInitDict = {});
+
+  readonly attribute Gamepad? gamepad;
+};
+
+dictionary GamepadEventInit : EventInit
+{
+  Gamepad? gamepad = null;
+};
diff --git a/dom/webidl/GamepadHapticActuator.webidl b/dom/webidl/GamepadHapticActuator.webidl
new file mode 100644
index 0000000000..9975b7ab85
--- /dev/null
+++ b/dom/webidl/GamepadHapticActuator.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/gamepad/extensions.html#gamepadhapticactuator-interface
+ */
+
+enum GamepadHapticActuatorType {
+  "vibration"
+};
+
+[Pref="dom.gamepad.extensions.enabled",
+ HeaderFile="mozilla/dom/GamepadHapticActuator.h",
+ Exposed=Window,
+ SecureContext]
+interface GamepadHapticActuator
+{
+  readonly attribute GamepadHapticActuatorType type;
+  [Throws, NewObject]
+  Promise<boolean> pulse(double value, double duration);
+};
diff --git a/dom/webidl/GamepadLightIndicator.webidl b/dom/webidl/GamepadLightIndicator.webidl
new file mode 100644
index 0000000000..2c447439c8
--- /dev/null
+++ b/dom/webidl/GamepadLightIndicator.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://github.com/knyg/gamepad/blob/lightindicator/extensions.html
+ */
+
+enum GamepadLightIndicatorType {
+  "on-off",
+  "rgb"
+};
+
+dictionary GamepadLightColor {
+  required octet red;
+  required octet green;
+  required octet blue;
+};
+
+[SecureContext, Pref="dom.gamepad.extensions.lightindicator",
+ Exposed=Window]
+interface GamepadLightIndicator
+{
+  readonly attribute GamepadLightIndicatorType type;
+  [Throws, NewObject]
+  Promise<boolean> setColor(GamepadLightColor color);
+};
diff --git a/dom/webidl/GamepadPose.webidl b/dom/webidl/GamepadPose.webidl
new file mode 100644
index 0000000000..4de822e7a7
--- /dev/null
+++ b/dom/webidl/GamepadPose.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/gamepad/extensions.html#gamepadpose-interface
+ */
+
+[Pref="dom.gamepad.extensions.enabled",
+ Exposed=Window,
+ SecureContext]
+interface GamepadPose
+{
+  readonly attribute boolean hasOrientation;
+  readonly attribute boolean hasPosition;
+
+  /**
+   * position, linearVelocity, and linearAcceleration are 3-component vectors.
+   * position is relative to a sitting space. Transforming this point with
+   * VRStageParameters.sittingToStandingTransform converts this to standing space.
+   */
+  [Constant, Throws] readonly attribute Float32Array? position;
+  [Constant, Throws] readonly attribute Float32Array? linearVelocity;
+  [Constant, Throws] readonly attribute Float32Array? linearAcceleration;
+
+  /* orientation is a 4-entry array representing the components of a quaternion. */
+  [Constant, Throws] readonly attribute Float32Array? orientation;
+  /* angularVelocity and angularAcceleration are the components of 3-dimensional vectors. */
+  [Constant, Throws] readonly attribute Float32Array? angularVelocity;
+  [Constant, Throws] readonly attribute Float32Array? angularAcceleration;
+};
diff --git a/dom/webidl/GamepadServiceTest.webidl b/dom/webidl/GamepadServiceTest.webidl
new file mode 100644
index 0000000000..dd8ae2144f
--- /dev/null
+++ b/dom/webidl/GamepadServiceTest.webidl
@@ -0,0 +1,58 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Pref="dom.gamepad.test.enabled",
+ Exposed=Window]
+interface GamepadServiceTest
+{
+  readonly attribute GamepadMappingType noMapping;
+  readonly attribute GamepadMappingType standardMapping;
+  readonly attribute GamepadHand noHand;
+  readonly attribute GamepadHand leftHand;
+  readonly attribute GamepadHand rightHand;
+
+  [NewObject]
+  Promise<unsigned long> addGamepad(DOMString id,
+                                    GamepadMappingType mapping,
+                                    GamepadHand hand,
+                                    unsigned long numButtons,
+                                    unsigned long numAxes,
+                                    unsigned long numHaptics,
+                                    unsigned long numLightIndicator,
+                                    unsigned long numTouchEvents);
+
+  [NewObject]
+  Promise<unsigned long> removeGamepad(unsigned long index);
+
+  [NewObject]
+  Promise<unsigned long> newButtonEvent(unsigned long index,
+                      unsigned long button,
+                      boolean pressed,
+                      boolean touched);
+
+  [NewObject]
+  Promise<unsigned long> newButtonValueEvent(unsigned long index,
+                                             unsigned long button,
+                                             boolean pressed,
+                                             boolean touched,
+                                             double value);
+
+  [NewObject]
+  Promise<unsigned long> newAxisMoveEvent(unsigned long index,
+                        unsigned long axis,
+                        double value);
+  [NewObject]
+  Promise<unsigned long> newPoseMove(unsigned long index,
+                   Float32Array? orient,
+                   Float32Array? pos,
+                   Float32Array? angVelocity,
+                   Float32Array? angAcceleration,
+                   Float32Array? linVelocity,
+                   Float32Array? linAcceleration);
+
+  [NewObject]
+  Promise<unsigned long> newTouch(unsigned long index, unsigned long aTouchArrayIndex,
+                unsigned long touchId, octet surfaceId,
+                Float32Array position, Float32Array? surfaceDimension);
+};
diff --git a/dom/webidl/GamepadTouch.webidl b/dom/webidl/GamepadTouch.webidl
new file mode 100644
index 0000000000..a9c84edcbd
--- /dev/null
+++ b/dom/webidl/GamepadTouch.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://github.com/knyg/gamepad/blob/multitouch/extensions.html
+ */
+
+[SecureContext, Pref="dom.gamepad.extensions.multitouch",
+ Exposed=Window]
+interface GamepadTouch {
+  readonly attribute unsigned long touchId;
+  readonly attribute octet surfaceId;
+  [Constant, Throws] readonly attribute Float32Array position;
+  [Constant, Throws] readonly attribute Uint32Array? surfaceDimensions;
+};
diff --git a/dom/webidl/GenericTransformStream.webidl b/dom/webidl/GenericTransformStream.webidl
new file mode 100644
index 0000000000..cc54b361fc
--- /dev/null
+++ b/dom/webidl/GenericTransformStream.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#other-specs-ts-wrapping
+ */
+
+interface mixin GenericTransformStream {
+  readonly attribute ReadableStream readable;
+  readonly attribute WritableStream writable;
+};
diff --git a/dom/webidl/Geolocation.webidl b/dom/webidl/Geolocation.webidl
new file mode 100644
index 0000000000..8b90a9a371
--- /dev/null
+++ b/dom/webidl/Geolocation.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/geolocation-API
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary PositionOptions {
+  boolean enableHighAccuracy = false;
+  [Clamp] unsigned long timeout = 0x7fffffff;
+  [Clamp] unsigned long maximumAge = 0;
+};
+
+[Exposed=Window]
+interface Geolocation {
+  [Throws, NeedsCallerType]
+  undefined getCurrentPosition(PositionCallback successCallback,
+                               optional PositionErrorCallback? errorCallback = null,
+                               optional PositionOptions options = {});
+
+  [Throws, NeedsCallerType]
+  long watchPosition(PositionCallback successCallback,
+                     optional PositionErrorCallback? errorCallback = null,
+                     optional PositionOptions options = {});
+
+  undefined clearWatch(long watchId);
+};
+
+callback PositionCallback = undefined (GeolocationPosition position);
+
+callback PositionErrorCallback = undefined (GeolocationPositionError positionError);
diff --git a/dom/webidl/GeolocationCoordinates.webidl b/dom/webidl/GeolocationCoordinates.webidl
new file mode 100644
index 0000000000..66c85ef8bc
--- /dev/null
+++ b/dom/webidl/GeolocationCoordinates.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/geolocation-API
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window, SecureContext]
+interface GeolocationCoordinates {
+  readonly attribute double latitude;
+  readonly attribute double longitude;
+  readonly attribute double? altitude;
+  readonly attribute double accuracy;
+  readonly attribute double? altitudeAccuracy;
+  readonly attribute double? heading;
+  readonly attribute double? speed;
+};
diff --git a/dom/webidl/GeolocationPosition.webidl b/dom/webidl/GeolocationPosition.webidl
new file mode 100644
index 0000000000..3c3c8bcb55
--- /dev/null
+++ b/dom/webidl/GeolocationPosition.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/geolocation-API
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window, SecureContext]
+interface GeolocationPosition {
+  readonly attribute GeolocationCoordinates coords;
+  readonly attribute EpochTimeStamp timestamp;
+};
diff --git a/dom/webidl/GeolocationPositionError.webidl b/dom/webidl/GeolocationPositionError.webidl
new file mode 100644
index 0000000000..63bf6dd029
--- /dev/null
+++ b/dom/webidl/GeolocationPositionError.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/geolocation-API
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface GeolocationPositionError {
+  const unsigned short PERMISSION_DENIED = 1;
+  const unsigned short POSITION_UNAVAILABLE = 2;
+  const unsigned short TIMEOUT = 3;
+  readonly attribute unsigned short code;
+  readonly attribute DOMString message;
+};
diff --git a/dom/webidl/GeometryUtils.webidl b/dom/webidl/GeometryUtils.webidl
new file mode 100644
index 0000000000..2f71b284ee
--- /dev/null
+++ b/dom/webidl/GeometryUtils.webidl
@@ -0,0 +1,54 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom-view/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum CSSBoxType { "margin", "border", "padding", "content" };
+dictionary BoxQuadOptions {
+  CSSBoxType box = "border";
+  GeometryNode relativeTo;
+  [ChromeOnly]
+  boolean createFramesForSuppressedWhitespace = true;
+};
+
+dictionary ConvertCoordinateOptions {
+  CSSBoxType fromBox = "border";
+  CSSBoxType toBox = "border";
+};
+
+interface mixin GeometryUtils {
+  [Throws, Func="nsINode::HasBoxQuadsSupport", NeedsCallerType]
+  sequence<DOMQuad> getBoxQuads(optional BoxQuadOptions options = {});
+
+  /* getBoxQuadsFromWindowOrigin is similar to getBoxQuads, but the
+   * returned quads are further translated relative to the window
+   * origin -- which is not the layout origin. Further translation
+   * must be done to bring the quads into layout space. Typically,
+   * this will be done by performing another call from the top level
+   * browser process, requesting the quad of the top level content
+   * document itself. The position of this quad can then be used as
+   * the offset into layout space, and subtracted from the original
+   * returned quads. If options.relativeTo is supplied, this method
+   * will throw.
+   */
+  [ChromeOnly, Throws, Func="nsINode::HasBoxQuadsSupport"]
+  sequence<DOMQuad> getBoxQuadsFromWindowOrigin(optional BoxQuadOptions options = {});
+
+  [Throws, Pref="layout.css.convertFromNode.enabled", NeedsCallerType]
+  DOMQuad convertQuadFromNode(DOMQuad quad, GeometryNode from, optional ConvertCoordinateOptions options = {});
+  [Throws, Pref="layout.css.convertFromNode.enabled", NeedsCallerType]
+  DOMQuad convertRectFromNode(DOMRectReadOnly rect, GeometryNode from, optional ConvertCoordinateOptions options = {});
+  [Throws, Pref="layout.css.convertFromNode.enabled", NeedsCallerType]
+  DOMPoint convertPointFromNode(DOMPointInit point, GeometryNode from, optional ConvertCoordinateOptions options = {});
+};
+
+// PseudoElement includes GeometryUtils;
+
+typedef (Text or Element /* or PseudoElement */ or Document) GeometryNode;
diff --git a/dom/webidl/GetUserMediaRequest.webidl b/dom/webidl/GetUserMediaRequest.webidl
new file mode 100644
index 0000000000..791c8c49ae
--- /dev/null
+++ b/dom/webidl/GetUserMediaRequest.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This is an internal IDL file
+ */
+
+interface nsIMediaDevice;
+
+// For gUM request start (getUserMedia:request) notification,
+// rawID, mediaSource and audioOutputOptions won't be set.
+// For selectAudioOutput request start (getUserMedia:request) notification,
+// rawID, mediaSource and constraints won't be set.
+// For gUM request stop (recording-device-stopped) notification due to page
+// reload, only windowID will be set.
+// For gUM request stop (recording-device-stopped) notification due to track
+// stop, only type, windowID, rawID and mediaSource will be set
+
+enum GetUserMediaRequestType {
+    "getusermedia",
+    "selectaudiooutput",
+    "recording-device-stopped"
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface GetUserMediaRequest {
+  readonly attribute GetUserMediaRequestType type;
+  readonly attribute unsigned long long windowID;
+  readonly attribute unsigned long long innerWindowID;
+  readonly attribute DOMString callID;
+  readonly attribute DOMString rawID;
+  readonly attribute DOMString mediaSource;
+  // The set of devices to consider
+  [Constant, Cached, Frozen]
+  readonly attribute sequence<nsIMediaDevice> devices;
+  MediaStreamConstraints getConstraints();
+  AudioOutputOptions getAudioOutputOptions();
+  readonly attribute boolean isSecure;
+  readonly attribute boolean isHandlingUserInput;
+};
diff --git a/dom/webidl/Grid.webidl b/dom/webidl/Grid.webidl
new file mode 100644
index 0000000000..0bd5525b03
--- /dev/null
+++ b/dom/webidl/Grid.webidl
@@ -0,0 +1,134 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/* These objects support visualization of a css-grid by the dev tools. */
+
+/**
+ * Explicit and implicit types apply to tracks, lines, and areas.
+ * https://drafts.csswg.org/css-grid/#explicit-grids
+ * https://drafts.csswg.org/css-grid/#implicit-grids
+ */
+enum GridDeclaration { "explicit", "implicit" };
+
+/**
+ * Tracks expanded from auto-fill are repeat , auto-fits with elements are
+ * also repeat, auto-fits with no elements are removed, other tracks are static.
+ */
+enum GridTrackState { "static", "repeat", "removed" };
+
+[ChromeOnly,
+ Exposed=Window]
+interface Grid
+{
+  readonly attribute GridDimension rows;
+  readonly attribute GridDimension cols;
+  [Cached, Constant]
+  readonly attribute sequence<GridArea> areas;
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridDimension
+{
+  readonly attribute GridLines lines;
+  readonly attribute GridTracks tracks;
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridLines
+{
+  readonly attribute unsigned long length;
+
+  /**
+   * This accessor method allows array-like access to lines.
+   * @param index A 0-indexed value.
+   */
+  getter GridLine? item(unsigned long index);
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridLine
+{
+  /**
+   * Names include both explicit names and implicit names, which will be
+   * assigned if the line contributes to a named area.
+   * https://drafts.csswg.org/css-grid/#implicit-named-lines
+   */
+  [Cached, Constant]
+  readonly attribute sequence<DOMString> names;
+
+  readonly attribute double start;
+
+  /**
+   * Breadth is the gap between the start of this line and the start of the
+   * next track in flow direction. It primarily is set by use of the -gap
+   * properties.
+   * https://drafts.csswg.org/css-grid/#gutters
+   */
+  readonly attribute double breadth;
+
+  readonly attribute GridDeclaration type;
+
+  /**
+   * Number is the 1-indexed index of the line in flow order. The
+   * first explicit line has number 1, and numbers increment by 1 for
+   * each line after that. Lines before the first explicit line
+   * have number 0, which is not a valid addressable line number, and
+   * should be filtered out by callers.
+   */
+  readonly attribute unsigned long number;
+
+  /**
+   * NegativeNumber is the 1-indexed index of the line in reverse
+   * flow order. The last explicit line has negativeNumber -1, and
+   * negativeNumbers decrement by 1 for each line before that.
+   * Lines after the last explicit line have negativeNumber 0, which
+   * is not a valid addressable line number, and should be filtered
+   * out by callers.
+   */
+  readonly attribute long negativeNumber;
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridTracks
+{
+  readonly attribute unsigned long length;
+
+  /**
+   * This accessor method allows array-like access to tracks.
+   * @param index A 0-indexed value.
+   */
+  getter GridTrack? item(unsigned long index);
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridTrack
+{
+  readonly attribute double start;
+  readonly attribute double breadth;
+  readonly attribute GridDeclaration type;
+  readonly attribute GridTrackState state;
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridArea
+{
+  readonly attribute DOMString name;
+  readonly attribute GridDeclaration type;
+
+  /**
+   * These values are 1-indexed line numbers bounding the area.
+   */
+  readonly attribute unsigned long rowStart;
+  readonly attribute unsigned long rowEnd;
+  readonly attribute unsigned long columnStart;
+  readonly attribute unsigned long columnEnd;
+};
diff --git a/dom/webidl/HTMLAllCollection.webidl b/dom/webidl/HTMLAllCollection.webidl
new file mode 100644
index 0000000000..43b989a68d
--- /dev/null
+++ b/dom/webidl/HTMLAllCollection.webidl
@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Emulates undefined through Codegen.py. */
+[LegacyUnenumerableNamedProperties,
+ Exposed=Window]
+interface HTMLAllCollection {
+  readonly attribute unsigned long length;
+  getter Element (unsigned long index);
+  getter (HTMLCollection or Element)? namedItem(DOMString name);
+  (HTMLCollection or Element)? item(optional DOMString nameOrIndex);
+  legacycaller (HTMLCollection or Element)? (optional DOMString nameOrIndex);
+};
diff --git a/dom/webidl/HTMLAnchorElement.webidl b/dom/webidl/HTMLAnchorElement.webidl
new file mode 100644
index 0000000000..3ca7455f4c
--- /dev/null
+++ b/dom/webidl/HTMLAnchorElement.webidl
@@ -0,0 +1,54 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-a-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-a-element
+[Exposed=Window]
+interface HTMLAnchorElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute DOMString target;
+           [CEReactions, SetterThrows]
+           attribute DOMString download;
+           [CEReactions, SetterThrows]
+           attribute DOMString ping;
+           [CEReactions, SetterThrows]
+           attribute DOMString rel;
+           [CEReactions, SetterThrows]
+           attribute DOMString referrerPolicy;
+           [PutForwards=value]
+  readonly attribute DOMTokenList relList;
+           [CEReactions, SetterThrows]
+           attribute DOMString hreflang;
+           [CEReactions, SetterThrows]
+           attribute DOMString type;
+
+           [CEReactions, Throws]
+           attribute DOMString text;
+};
+
+HTMLAnchorElement includes HTMLHyperlinkElementUtils;
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLAnchorElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString coords;
+           [CEReactions, SetterThrows]
+           attribute DOMString charset;
+           [CEReactions, SetterThrows]
+           attribute DOMString name;
+           [CEReactions, SetterThrows]
+           attribute DOMString rev;
+           [CEReactions, SetterThrows]
+           attribute DOMString shape;
+};
diff --git a/dom/webidl/HTMLAreaElement.webidl b/dom/webidl/HTMLAreaElement.webidl
new file mode 100644
index 0000000000..7bef4a316c
--- /dev/null
+++ b/dom/webidl/HTMLAreaElement.webidl
@@ -0,0 +1,46 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-area-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ &
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-area-element
+[Exposed=Window]
+interface HTMLAreaElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute DOMString alt;
+           [CEReactions, SetterThrows]
+           attribute DOMString coords;
+           [CEReactions, SetterThrows]
+           attribute DOMString shape;
+           [CEReactions, SetterThrows]
+           attribute DOMString target;
+           [CEReactions, SetterThrows]
+           attribute DOMString download;
+           [CEReactions, SetterThrows]
+           attribute DOMString ping;
+           [CEReactions, SetterThrows]
+           attribute DOMString rel;
+           [CEReactions, SetterThrows]
+           attribute DOMString referrerPolicy;
+           [PutForwards=value]
+  readonly attribute DOMTokenList relList;
+};
+
+HTMLAreaElement includes HTMLHyperlinkElementUtils;
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLAreaElement {
+           [CEReactions, SetterThrows]
+           attribute boolean noHref;
+};
diff --git a/dom/webidl/HTMLAudioElement.webidl b/dom/webidl/HTMLAudioElement.webidl
new file mode 100644
index 0000000000..a0d5eb8460
--- /dev/null
+++ b/dom/webidl/HTMLAudioElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-audio-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[LegacyFactoryFunction=Audio(optional DOMString src),
+ Exposed=Window]
+interface HTMLAudioElement : HTMLMediaElement {
+  [HTMLConstructor] constructor();
+};
diff --git a/dom/webidl/HTMLBRElement.webidl b/dom/webidl/HTMLBRElement.webidl
new file mode 100644
index 0000000000..9762fda019
--- /dev/null
+++ b/dom/webidl/HTMLBRElement.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-br-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-br-element
+[Exposed=Window]
+interface HTMLBRElement : HTMLElement {
+  [HTMLConstructor] constructor();
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLBRElement {
+             [CEReactions, SetterThrows]
+             attribute DOMString clear;
+};
+
+// Mozilla extensions
+
+partial interface HTMLBRElement {
+  // Set to true if the <br> element is created by editor for placing caret
+  // at proper position in empty editor.
+  [ChromeOnly]
+  readonly attribute boolean isPaddingForEmptyEditor;
+  // Set to true if the <br> element is created by editor for placing caret
+  // at proper position making last empty line in a block element in HTML
+  // editor or <textarea> element visible.
+  [ChromeOnly]
+  readonly attribute boolean isPaddingForEmptyLastLine;
+};
diff --git a/dom/webidl/HTMLBaseElement.webidl b/dom/webidl/HTMLBaseElement.webidl
new file mode 100644
index 0000000000..caa4b8dbd8
--- /dev/null
+++ b/dom/webidl/HTMLBaseElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-base-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-base-element
+[Exposed=Window]
+interface HTMLBaseElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString href;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString target;
+};
diff --git a/dom/webidl/HTMLBodyElement.webidl b/dom/webidl/HTMLBodyElement.webidl
new file mode 100644
index 0000000000..fdec58df6a
--- /dev/null
+++ b/dom/webidl/HTMLBodyElement.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLBodyElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+};
+
+partial interface HTMLBodyElement {
+  [CEReactions, SetterThrows]
+  attribute [LegacyNullToEmptyString] DOMString text;
+  [CEReactions, SetterThrows]
+  attribute [LegacyNullToEmptyString] DOMString link;
+  [CEReactions, SetterThrows]
+  attribute [LegacyNullToEmptyString] DOMString vLink;
+  [CEReactions, SetterThrows]
+  attribute [LegacyNullToEmptyString] DOMString aLink;
+  [CEReactions, SetterThrows]
+  attribute [LegacyNullToEmptyString] DOMString bgColor;
+  [CEReactions, SetterThrows]
+  attribute DOMString background;
+};
+
+HTMLBodyElement includes WindowEventHandlers;
diff --git a/dom/webidl/HTMLButtonElement.webidl b/dom/webidl/HTMLButtonElement.webidl
new file mode 100644
index 0000000000..37770416ae
--- /dev/null
+++ b/dom/webidl/HTMLButtonElement.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-button-element
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-button-element
+[Exposed=Window]
+interface HTMLButtonElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean disabled;
+  [Pure]
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString formAction;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString formEnctype;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString formMethod;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean formNoValidate;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString formTarget;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString value;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  undefined setCustomValidity(DOMString error);
+
+  readonly attribute NodeList labels;
+};
+
+HTMLButtonElement includes PopoverInvokerElement;
diff --git a/dom/webidl/HTMLCanvasElement.webidl b/dom/webidl/HTMLCanvasElement.webidl
new file mode 100644
index 0000000000..3de8401cb8
--- /dev/null
+++ b/dom/webidl/HTMLCanvasElement.webidl
@@ -0,0 +1,69 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-canvas-element
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface nsISupports;
+
+typedef (HTMLCanvasElement or OffscreenCanvas) CanvasSource;
+
+[Exposed=Window]
+interface HTMLCanvasElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long width;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long height;
+
+  [Throws]
+  nsISupports? getContext(DOMString contextId, optional any contextOptions = null);
+
+  [Throws, NeedsSubjectPrincipal]
+  DOMString toDataURL(optional DOMString type = "",
+                      optional any encoderOptions);
+  [Throws, NeedsSubjectPrincipal]
+  undefined toBlob(BlobCallback callback,
+                   optional DOMString type = "",
+                   optional any encoderOptions);
+};
+
+// Mozilla specific bits
+partial interface HTMLCanvasElement {
+  [Pure, SetterThrows]
+           attribute boolean mozOpaque;
+
+           attribute PrintCallback? mozPrintCallback;
+
+  [Throws, Pref="canvas.capturestream.enabled", NeedsSubjectPrincipal]
+  CanvasCaptureMediaStream captureStream(optional double frameRate);
+};
+
+// For OffscreenCanvas
+// Reference: https://wiki.whatwg.org/wiki/OffscreenCanvas
+partial interface HTMLCanvasElement {
+  [Pref="gfx.offscreencanvas.enabled", Throws]
+  OffscreenCanvas transferControlToOffscreen();
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface MozCanvasPrintState
+{
+  // A canvas rendering context.
+  readonly attribute nsISupports context;
+
+  // To be called when rendering to the context is done.
+  undefined done();
+};
+
+callback PrintCallback = undefined(MozCanvasPrintState ctx);
+
+callback BlobCallback = undefined(Blob? blob);
diff --git a/dom/webidl/HTMLCollection.webidl b/dom/webidl/HTMLCollection.webidl
new file mode 100644
index 0000000000..805788b572
--- /dev/null
+++ b/dom/webidl/HTMLCollection.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[LegacyUnenumerableNamedProperties,
+ Exposed=Window]
+interface HTMLCollection {
+  readonly attribute unsigned long length;
+  getter Element? item(unsigned long index);
+  getter Element? namedItem(DOMString name);
+};
diff --git a/dom/webidl/HTMLDListElement.webidl b/dom/webidl/HTMLDListElement.webidl
new file mode 100644
index 0000000000..00afe405b6
--- /dev/null
+++ b/dom/webidl/HTMLDListElement.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-dl-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-dl-element
+[Exposed=Window]
+interface HTMLDListElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLDListElement {
+           [CEReactions, SetterThrows]
+           attribute boolean compact;
+};
diff --git a/dom/webidl/HTMLDataElement.webidl b/dom/webidl/HTMLDataElement.webidl
new file mode 100644
index 0000000000..1a04747e75
--- /dev/null
+++ b/dom/webidl/HTMLDataElement.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level-semantics.html#the-data-element
+ */
+
+[Exposed=Window]
+interface HTMLDataElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute DOMString value;
+};
diff --git a/dom/webidl/HTMLDataListElement.webidl b/dom/webidl/HTMLDataListElement.webidl
new file mode 100644
index 0000000000..23c462a3b7
--- /dev/null
+++ b/dom/webidl/HTMLDataListElement.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLDataListElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  readonly attribute HTMLCollection options;
+};
diff --git a/dom/webidl/HTMLDetailsElement.webidl b/dom/webidl/HTMLDetailsElement.webidl
new file mode 100644
index 0000000000..7f293f8ed8
--- /dev/null
+++ b/dom/webidl/HTMLDetailsElement.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/forms.html#the-details-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLDetailsElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows]
+  attribute boolean open;
+};
diff --git a/dom/webidl/HTMLDialogElement.webidl b/dom/webidl/HTMLDialogElement.webidl
new file mode 100644
index 0000000000..5a355c023e
--- /dev/null
+++ b/dom/webidl/HTMLDialogElement.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/forms.html#the-dialog-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Func="mozilla::dom::HTMLDialogElement::IsDialogEnabled",
+ Exposed=Window]
+interface HTMLDialogElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows]
+  attribute boolean open;
+  attribute DOMString returnValue;
+  [CEReactions, Throws]
+  undefined show();
+  [CEReactions, Throws]
+  undefined showModal();
+  [CEReactions]
+  undefined close(optional DOMString returnValue);
+};
diff --git a/dom/webidl/HTMLDirectoryElement.webidl b/dom/webidl/HTMLDirectoryElement.webidl
new file mode 100644
index 0000000000..d4f9d570bc
--- /dev/null
+++ b/dom/webidl/HTMLDirectoryElement.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+[Exposed=Window]
+interface HTMLDirectoryElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows, Pure]
+           attribute boolean compact;
+};
diff --git a/dom/webidl/HTMLDivElement.webidl b/dom/webidl/HTMLDivElement.webidl
new file mode 100644
index 0000000000..44c810f9ea
--- /dev/null
+++ b/dom/webidl/HTMLDivElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window, ProbablyShortLivingWrapper]
+interface HTMLDivElement : HTMLElement {
+  [HTMLConstructor] constructor();
+};
+
+partial interface HTMLDivElement {
+  [CEReactions, SetterThrows]
+           attribute DOMString align;
+};
diff --git a/dom/webidl/HTMLDocument.webidl b/dom/webidl/HTMLDocument.webidl
new file mode 100644
index 0000000000..d9358fd8d6
--- /dev/null
+++ b/dom/webidl/HTMLDocument.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[LegacyOverrideBuiltIns,
+ Exposed=Window,
+ InstrumentedProps=(adoptedStyleSheets,
+                    caretRangeFromPoint,
+                    clear,
+                    exitPictureInPicture,
+                    featurePolicy,
+                    onbeforecopy,
+                    onbeforecut,
+                    onbeforepaste,
+                    oncancel,
+                    onfreeze,
+                    onmousewheel,
+                    onresume,
+                    onsearch,
+                    onsecuritypolicyviolation,
+                    onwebkitfullscreenchange,
+                    onwebkitfullscreenerror,
+                    pictureInPictureElement,
+                    pictureInPictureEnabled,
+                    registerElement,
+                    wasDiscarded,
+                    webkitCancelFullScreen,
+                    webkitCurrentFullScreenElement,
+                    webkitExitFullscreen,
+                    webkitFullscreenElement,
+                    webkitFullscreenEnabled,
+                    webkitHidden,
+                    webkitIsFullScreen,
+                    webkitVisibilityState,
+                    xmlEncoding,
+                    xmlStandalone,
+                    xmlVersion)]
+interface HTMLDocument : Document {
+  // DOM tree accessors
+  [Throws]
+  getter object (DOMString name);
+};
diff --git a/dom/webidl/HTMLElement.webidl b/dom/webidl/HTMLElement.webidl
new file mode 100644
index 0000000000..32b79b2e88
--- /dev/null
+++ b/dom/webidl/HTMLElement.webidl
@@ -0,0 +1,121 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/ and
+ * http://dev.w3.org/csswg/cssom-view/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLElement : Element {
+  [HTMLConstructor] constructor();
+
+  // metadata attributes
+  [CEReactions]
+           attribute DOMString title;
+  [CEReactions]
+           attribute DOMString lang;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean translate;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString dir;
+
+  [CEReactions, GetterThrows, Pure]
+           attribute [LegacyNullToEmptyString] DOMString innerText;
+  [CEReactions, GetterThrows, SetterThrows, Pure]
+           attribute [LegacyNullToEmptyString] DOMString outerText;
+
+  // user interaction
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean hidden;
+  [CEReactions, SetterThrows, Pure, Pref="html5.inert.enabled"]
+           attribute boolean inert;
+  [NeedsCallerType]
+  undefined click();
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString accessKey;
+  [Pure]
+  readonly attribute DOMString accessKeyLabel;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean draggable;
+  //[PutForwards=value] readonly attribute DOMTokenList dropzone;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString contentEditable;
+  [Pure]
+  readonly attribute boolean isContentEditable;
+  [CEReactions, SetterThrows, Pure, Pref="dom.element.popover.enabled"]
+           attribute DOMString? popover;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean spellcheck;
+  [CEReactions, Pure, SetterThrows, Pref="dom.forms.inputmode"]
+           attribute DOMString inputMode;
+  [CEReactions, Pure, SetterThrows, Pref="dom.forms.enterkeyhint"]
+           attribute DOMString enterKeyHint;
+  [CEReactions, Pure, SetterThrows, Pref="dom.forms.autocapitalize"]
+           attribute DOMString autocapitalize;
+
+  attribute DOMString nonce;
+
+  // command API
+  //readonly attribute DOMString? commandType;
+  //readonly attribute DOMString? commandLabel;
+  //readonly attribute DOMString? commandIcon;
+  //readonly attribute boolean? commandHidden;
+  //readonly attribute boolean? commandDisabled;
+  //readonly attribute boolean? commandChecked;
+
+  // https://html.spec.whatwg.org/multipage/custom-elements.html#dom-attachinternals
+  [Throws]
+  ElementInternals attachInternals();
+
+  [Throws, Pref="dom.element.popover.enabled"]
+  undefined showPopover();
+  [Throws, Pref="dom.element.popover.enabled"]
+  undefined hidePopover();
+  [Throws, Pref="dom.element.popover.enabled"]
+  undefined togglePopover(optional boolean force);
+};
+
+// http://dev.w3.org/csswg/cssom-view/#extensions-to-the-htmlelement-interface
+partial interface HTMLElement {
+  // CSSOM things are not [Pure] because they can flush
+  readonly attribute Element? offsetParent;
+  readonly attribute long offsetTop;
+  readonly attribute long offsetLeft;
+  readonly attribute long offsetWidth;
+  readonly attribute long offsetHeight;
+};
+
+partial interface HTMLElement {
+  [ChromeOnly]
+  readonly attribute ElementInternals? internals;
+
+  [ChromeOnly]
+  readonly attribute boolean isFormAssociatedCustomElements;
+};
+
+interface mixin TouchEventHandlers {
+  [Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+           attribute EventHandler ontouchstart;
+  [Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+           attribute EventHandler ontouchend;
+  [Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+           attribute EventHandler ontouchmove;
+  [Func="nsGenericHTMLElement::LegacyTouchAPIEnabled"]
+           attribute EventHandler ontouchcancel;
+};
+
+HTMLElement includes GlobalEventHandlers;
+HTMLElement includes HTMLOrForeignElement;
+HTMLElement includes ElementCSSInlineStyle;
+HTMLElement includes TouchEventHandlers;
+HTMLElement includes OnErrorEventHandlerForNodes;
+
+[Exposed=Window]
+interface HTMLUnknownElement : HTMLElement {};
diff --git a/dom/webidl/HTMLEmbedElement.webidl b/dom/webidl/HTMLEmbedElement.webidl
new file mode 100644
index 0000000000..01ebced015
--- /dev/null
+++ b/dom/webidl/HTMLEmbedElement.webidl
@@ -0,0 +1,47 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-embed-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#HTMLEmbedElement-partial
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-embed-element
+[NeedResolve,
+ Exposed=Window]
+interface HTMLEmbedElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString src;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString type;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString width;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString height;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#HTMLEmbedElement-partial
+partial interface HTMLEmbedElement {
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString align;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString name;
+};
+
+partial interface HTMLEmbedElement {
+  // GetSVGDocument
+  [NeedsSubjectPrincipal]
+  Document? getSVGDocument();
+};
+
+HTMLEmbedElement includes MozImageLoadingContent;
+HTMLEmbedElement includes MozFrameLoaderOwner;
+HTMLEmbedElement includes MozObjectLoadingContent;
diff --git a/dom/webidl/HTMLFieldSetElement.webidl b/dom/webidl/HTMLFieldSetElement.webidl
new file mode 100644
index 0000000000..7af0b1e728
--- /dev/null
+++ b/dom/webidl/HTMLFieldSetElement.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-fieldset-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLFieldSetElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows]
+           attribute boolean disabled;
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows]
+           attribute DOMString name;
+
+  readonly attribute DOMString type;
+
+  readonly attribute HTMLCollection elements;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+
+  boolean checkValidity();
+  boolean reportValidity();
+
+  undefined setCustomValidity(DOMString error);
+};
diff --git a/dom/webidl/HTMLFontElement.webidl b/dom/webidl/HTMLFontElement.webidl
new file mode 100644
index 0000000000..29d68811e1
--- /dev/null
+++ b/dom/webidl/HTMLFontElement.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLFontElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows] attribute [LegacyNullToEmptyString] DOMString color;
+  [CEReactions, SetterThrows]                          attribute DOMString face;
+  [CEReactions, SetterThrows]                          attribute DOMString size;
+};
diff --git a/dom/webidl/HTMLFormControlsCollection.webidl b/dom/webidl/HTMLFormControlsCollection.webidl
new file mode 100644
index 0000000000..c4024725aa
--- /dev/null
+++ b/dom/webidl/HTMLFormControlsCollection.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#htmlformcontrolscollection
+ *
+ * © Copyright 2004-2013 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLFormControlsCollection : HTMLCollection {
+  // inherits length and item()
+  /* legacycaller */ getter (RadioNodeList or Element)? namedItem(DOMString name); // shadows inherited namedItem()
+};
diff --git a/dom/webidl/HTMLFormElement.webidl b/dom/webidl/HTMLFormElement.webidl
new file mode 100644
index 0000000000..f45401f3b9
--- /dev/null
+++ b/dom/webidl/HTMLFormElement.webidl
@@ -0,0 +1,59 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#htmlformelement
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[LegacyOverrideBuiltIns, LegacyUnenumerableNamedProperties,
+ Exposed=Window]
+interface HTMLFormElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString acceptCharset;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString action;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString autocomplete;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString enctype;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString encoding;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString method;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString name;
+           [CEReactions, Pure, SetterThrows]
+           attribute boolean noValidate;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString target;
+           [CEReactions, Pure, SetterThrows]
+           attribute DOMString rel;
+           [PutForwards=value]
+           readonly attribute DOMTokenList relList;
+
+  [Constant]
+  readonly attribute HTMLCollection elements;
+  [Pure]
+  readonly attribute long length;
+
+  getter Element (unsigned long index);
+  // TODO this should be: getter (RadioNodeList or HTMLInputElement or HTMLImageElement) (DOMString name);
+  getter nsISupports (DOMString name);
+
+  [Throws]
+  undefined submit();
+  [Throws]
+  undefined requestSubmit(optional HTMLElement? submitter = null);
+  [CEReactions]
+  undefined reset();
+  boolean checkValidity();
+  boolean reportValidity();
+};
diff --git a/dom/webidl/HTMLFrameElement.webidl b/dom/webidl/HTMLFrameElement.webidl
new file mode 100644
index 0000000000..5f83ba4f30
--- /dev/null
+++ b/dom/webidl/HTMLFrameElement.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#htmlframeelement
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#htmlframeelement
+[Exposed=Window]
+interface HTMLFrameElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute DOMString name;
+           [CEReactions, SetterThrows]
+           attribute DOMString scrolling;
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString src;
+           [CEReactions, SetterThrows]
+           attribute DOMString frameBorder;
+           [CEReactions, SetterThrows]
+           attribute DOMString longDesc;
+           [CEReactions, SetterThrows]
+           attribute boolean noResize;
+  [NeedsSubjectPrincipal]
+  readonly attribute Document? contentDocument;
+  readonly attribute WindowProxy? contentWindow;
+
+  [CEReactions, SetterThrows]
+  attribute [LegacyNullToEmptyString] DOMString marginHeight;
+  [CEReactions, SetterThrows]
+  attribute [LegacyNullToEmptyString] DOMString marginWidth;
+};
+
+HTMLFrameElement includes MozFrameLoaderOwner;
diff --git a/dom/webidl/HTMLFrameSetElement.webidl b/dom/webidl/HTMLFrameSetElement.webidl
new file mode 100644
index 0000000000..49e6c54956
--- /dev/null
+++ b/dom/webidl/HTMLFrameSetElement.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLFrameSetElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows]
+  attribute DOMString cols;
+  [CEReactions, SetterThrows]
+  attribute DOMString rows;
+};
+
+HTMLFrameSetElement includes WindowEventHandlers;
diff --git a/dom/webidl/HTMLHRElement.webidl b/dom/webidl/HTMLHRElement.webidl
new file mode 100644
index 0000000000..b73c2589db
--- /dev/null
+++ b/dom/webidl/HTMLHRElement.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-hr-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-hr-element
+[Exposed=Window]
+interface HTMLHRElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLHRElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString color;
+           [CEReactions, SetterThrows]
+           attribute boolean noShade;
+           [CEReactions, SetterThrows]
+           attribute DOMString size;
+           [CEReactions, SetterThrows]
+           attribute DOMString width;
+};
diff --git a/dom/webidl/HTMLHeadElement.webidl b/dom/webidl/HTMLHeadElement.webidl
new file mode 100644
index 0000000000..c296ded379
--- /dev/null
+++ b/dom/webidl/HTMLHeadElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-head-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-head-element
+[Exposed=Window]
+interface HTMLHeadElement : HTMLElement {
+  [HTMLConstructor] constructor();
+};
diff --git a/dom/webidl/HTMLHeadingElement.webidl b/dom/webidl/HTMLHeadingElement.webidl
new file mode 100644
index 0000000000..0092388e96
--- /dev/null
+++ b/dom/webidl/HTMLHeadingElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-h1,-h2,-h3,-h4,-h5,-and-h6-elements
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-h1,-h2,-h3,-h4,-h5,-and-h6-elements
+[Exposed=Window]
+interface HTMLHeadingElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLHeadingElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+};
diff --git a/dom/webidl/HTMLHtmlElement.webidl b/dom/webidl/HTMLHtmlElement.webidl
new file mode 100644
index 0000000000..38f1b3bc53
--- /dev/null
+++ b/dom/webidl/HTMLHtmlElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-html-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-html-element
+[Exposed=Window]
+interface HTMLHtmlElement : HTMLElement {
+  [HTMLConstructor] constructor();
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLHtmlElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString version;
+};
diff --git a/dom/webidl/HTMLHyperlinkElementUtils.webidl b/dom/webidl/HTMLHyperlinkElementUtils.webidl
new file mode 100644
index 0000000000..652437c81b
--- /dev/null
+++ b/dom/webidl/HTMLHyperlinkElementUtils.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/semantics.html#htmlhyperlinkelementutils
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface mixin HTMLHyperlinkElementUtils {
+  [CEReactions, SetterThrows]
+  stringifier attribute USVString href;
+
+  readonly attribute USVString origin;
+  [CEReactions]
+           attribute USVString protocol;
+  [CEReactions]
+           attribute USVString username;
+  [CEReactions]
+           attribute USVString password;
+  [CEReactions]
+           attribute USVString host;
+  [CEReactions]
+           attribute USVString hostname;
+  [CEReactions]
+           attribute USVString port;
+  [CEReactions]
+           attribute USVString pathname;
+  [CEReactions]
+           attribute USVString search;
+  [CEReactions]
+           attribute USVString hash;
+};
diff --git a/dom/webidl/HTMLIFrameElement.webidl b/dom/webidl/HTMLIFrameElement.webidl
new file mode 100644
index 0000000000..b132a1c411
--- /dev/null
+++ b/dom/webidl/HTMLIFrameElement.webidl
@@ -0,0 +1,73 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-iframe-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * https://wicg.github.io/feature-policy/#policy
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLIFrameElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows, Pure]
+           attribute DOMString src;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString srcdoc;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+  [PutForwards=value] readonly attribute DOMTokenList sandbox;
+           // attribute boolean seamless;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean allowFullscreen;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString width;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString height;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString referrerPolicy;
+  [NeedsSubjectPrincipal]
+  readonly attribute Document? contentDocument;
+  readonly attribute WindowProxy? contentWindow;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLIFrameElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString align;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString scrolling;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString frameBorder;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString longDesc;
+
+  [CEReactions, SetterThrows, Pure]
+           attribute [LegacyNullToEmptyString] DOMString marginHeight;
+  [CEReactions, SetterThrows, Pure]
+           attribute [LegacyNullToEmptyString] DOMString marginWidth;
+};
+
+partial interface HTMLIFrameElement {
+  // GetSVGDocument
+  [NeedsSubjectPrincipal]
+  Document? getSVGDocument();
+};
+
+HTMLIFrameElement includes MozFrameLoaderOwner;
+
+// https://w3c.github.io/webappsec-feature-policy/#idl-index
+partial interface HTMLIFrameElement {
+  [SameObject, Pref="dom.security.featurePolicy.webidl.enabled"]
+  readonly attribute FeaturePolicy featurePolicy;
+
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString allow;
+};
diff --git a/dom/webidl/HTMLImageElement.webidl b/dom/webidl/HTMLImageElement.webidl
new file mode 100644
index 0000000000..46ad519f5e
--- /dev/null
+++ b/dom/webidl/HTMLImageElement.webidl
@@ -0,0 +1,134 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#htmlimageelement
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface imgINotificationObserver;
+interface imgIRequest;
+interface URI;
+interface nsIStreamListener;
+
+[LegacyFactoryFunction=Image(optional unsigned long width, optional unsigned long height),
+ Exposed=Window]
+interface HTMLImageElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute DOMString alt;
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString src;
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString srcset;
+           [CEReactions, SetterThrows]
+           attribute DOMString? crossOrigin;
+           [CEReactions, SetterThrows]
+           attribute DOMString useMap;
+           [CEReactions, SetterThrows]
+           attribute DOMString referrerPolicy;
+           [CEReactions, SetterThrows]
+           attribute boolean isMap;
+           [CEReactions, SetterThrows]
+           attribute unsigned long width;
+           [CEReactions, SetterThrows]
+           attribute unsigned long height;
+           [CEReactions, SetterThrows]
+           attribute DOMString decoding;
+           [CEReactions, SetterThrows, Pref="dom.image-lazy-loading.enabled"]
+           attribute DOMString loading;
+  readonly attribute unsigned long naturalWidth;
+  readonly attribute unsigned long naturalHeight;
+  readonly attribute boolean complete;
+           [NewObject]
+           Promise<undefined> decode();
+           [NewObject, ChromeOnly]
+           Promise<sequence<ImageText>> recognizeCurrentImageText();
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLImageElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString name;
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute unsigned long hspace;
+           [CEReactions, SetterThrows]
+           attribute unsigned long vspace;
+           [CEReactions, SetterThrows]
+           attribute DOMString longDesc;
+
+  [CEReactions, SetterThrows] attribute [LegacyNullToEmptyString] DOMString border;
+};
+
+// [Update me: not in whatwg spec yet]
+// http://picture.responsiveimages.org/#the-img-element
+partial interface HTMLImageElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString sizes;
+  readonly attribute DOMString currentSrc;
+};
+
+// Mozilla extensions.
+partial interface HTMLImageElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString lowsrc;
+
+  // These attributes are offsets from the closest view (to mimic
+  // NS4's "offset-from-layer" behavior).
+  readonly attribute long x;
+  readonly attribute long y;
+};
+
+interface mixin MozImageLoadingContent {
+  // Mirrored chrome-only nsIImageLoadingContent methods.  Please make sure
+  // to update this list if nsIImageLoadingContent changes.
+  [ChromeOnly]
+  const long UNKNOWN_REQUEST = -1;
+  [ChromeOnly]
+  const long CURRENT_REQUEST = 0;
+  [ChromeOnly]
+  const long PENDING_REQUEST = 1;
+
+  [ChromeOnly]
+  attribute boolean loadingEnabled;
+  /**
+   * Same as addNativeObserver but intended for scripted observers or observers
+   * from another or without a document.
+   */
+  [ChromeOnly]
+  undefined addObserver(imgINotificationObserver aObserver);
+  /**
+   * Same as removeNativeObserver but intended for scripted observers or
+   * observers from another or without a document.
+   */
+  [ChromeOnly]
+  undefined removeObserver(imgINotificationObserver aObserver);
+  [ChromeOnly,Throws]
+  imgIRequest? getRequest(long aRequestType);
+  [ChromeOnly,Throws]
+  long getRequestType(imgIRequest aRequest);
+  [ChromeOnly]
+  readonly attribute URI? currentURI;
+  // Gets the final URI of the current request, if available.
+  // Otherwise, returns null.
+  [ChromeOnly]
+  readonly attribute URI? currentRequestFinalURI;
+  /**
+   * forceReload forces reloading of the image pointed to by currentURI
+   *
+   * @param aNotify request should notify
+   * @throws NS_ERROR_NOT_AVAILABLE if there is no current URI to reload
+   */
+  [ChromeOnly,Throws]
+  undefined forceReload(optional boolean aNotify = true);
+};
+
+HTMLImageElement includes MozImageLoadingContent;
diff --git a/dom/webidl/HTMLInputElement.webidl b/dom/webidl/HTMLInputElement.webidl
new file mode 100644
index 0000000000..ad9f8de92f
--- /dev/null
+++ b/dom/webidl/HTMLInputElement.webidl
@@ -0,0 +1,283 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-input-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * https://wicg.github.io/entries-api/#idl-index
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+enum SelectionMode {
+  "select",
+  "start",
+  "end",
+  "preserve",
+};
+
+interface XULControllers;
+
+[Exposed=Window]
+interface HTMLInputElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString accept;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString alt;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString autocomplete;
+  [CEReactions, Pure, SetterThrows, Pref="dom.capture.enabled"]
+           attribute DOMString capture;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean defaultChecked;
+  [Pure]
+           attribute boolean checked;
+           // Bug 850337 - attribute DOMString dirName;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean disabled;
+  readonly attribute HTMLFormElement? form;
+  [Pure]
+           attribute FileList? files;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString formAction;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString formEnctype;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString formMethod;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean formNoValidate;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString formTarget;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long height;
+  [Pure]
+           attribute boolean indeterminate;
+  [Pure]
+  readonly attribute HTMLDataListElement? list;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString max;
+  [CEReactions, Pure, SetterThrows]
+           attribute long maxLength;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString min;
+  [CEReactions, Pure, SetterThrows]
+           attribute long minLength;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean multiple;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString name;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString pattern;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString placeholder;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean readOnly;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean required;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long size;
+  [CEReactions, Pure, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString src;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString step;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString type;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString defaultValue;
+  [CEReactions, Pure, SetterThrows, NeedsCallerType]
+           attribute [LegacyNullToEmptyString] DOMString value;
+  [Throws]
+           attribute object? valueAsDate;
+  [Pure, SetterThrows]
+           attribute unrestricted double valueAsNumber;
+  [CEReactions, SetterThrows]
+           attribute unsigned long width;
+
+  [Throws]
+  undefined stepUp(optional long n = 1);
+  [Throws]
+  undefined stepDown(optional long n = 1);
+
+  [Pure]
+  readonly attribute boolean willValidate;
+  [Pure]
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  undefined setCustomValidity(DOMString error);
+
+  readonly attribute NodeList? labels;
+
+  undefined select();
+
+  [Throws]
+           attribute unsigned long? selectionStart;
+  [Throws]
+           attribute unsigned long? selectionEnd;
+  [Throws]
+           attribute DOMString? selectionDirection;
+  [Throws]
+  undefined setRangeText(DOMString replacement);
+  [Throws]
+  undefined setRangeText(DOMString replacement, unsigned long start,
+    unsigned long end, optional SelectionMode selectionMode = "preserve");
+  [Throws]
+  undefined setSelectionRange(unsigned long start, unsigned long end, optional DOMString direction);
+
+  [Throws, Pref="dom.input.showPicker"]
+  undefined showPicker();
+
+  // also has obsolete members
+};
+
+partial interface HTMLInputElement {
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString align;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString useMap;
+};
+
+// Mozilla extensions
+
+partial interface HTMLInputElement {
+  [GetterThrows, ChromeOnly]
+  readonly attribute XULControllers?       controllers;
+  // Binaryname because we have a FragmentOrElement function named "TextLength()".
+  [NeedsCallerType, BinaryName="inputTextLength"]
+  readonly attribute long                  textLength;
+
+  [Throws, ChromeOnly]
+  sequence<DOMString> mozGetFileNameArray();
+
+  [ChromeOnly, Throws]
+  undefined mozSetFileNameArray(sequence<DOMString> fileNames);
+
+  [ChromeOnly]
+  undefined mozSetFileArray(sequence<File> files);
+
+  // This method is meant to use for testing only.
+  [ChromeOnly, Throws]
+  undefined mozSetDirectory(DOMString directoryPath);
+
+  // This method is meant to use for testing only.
+  [ChromeOnly]
+  undefined mozSetDndFilesAndDirectories(sequence<(File or Directory)> list);
+
+  // This method is meant to use for testing only.
+  [ChromeOnly, NewObject]
+  Promise<sequence<(File or Directory)>> getFilesAndDirectories();
+
+  boolean mozIsTextField(boolean aExcludePassword);
+
+  [ChromeOnly]
+  readonly attribute boolean hasBeenTypePassword;
+
+  [ChromeOnly]
+  attribute DOMString previewValue;
+
+  // Last value entered by the user, not by a script.
+  // NOTE(emilio): As of right now some execCommand triggered changes might be
+  // considered interactive.
+  [ChromeOnly]
+  readonly attribute DOMString lastInteractiveValue;
+
+  [ChromeOnly]
+  // This function will return null if @autocomplete is not defined for the
+  // current @type
+  AutocompleteInfo? getAutocompleteInfo();
+
+  [ChromeOnly]
+  // The reveal password state for a type=password control.
+  attribute boolean revealPassword;
+};
+
+interface mixin MozEditableElement {
+  // Returns an nsIEditor instance which is associated with the element.
+  // If the element can be associated with an editor but not yet created,
+  // this creates new one automatically.
+  [Pure, ChromeOnly, BinaryName="editorForBindings"]
+  readonly attribute nsIEditor? editor;
+
+  // Returns true if an nsIEditor instance has already been associated with
+  // the element.
+  [Pure, ChromeOnly]
+  readonly attribute boolean hasEditor;
+
+  // This is set to true if "input" event should be fired with InputEvent on
+  // the element.  Otherwise, i.e., if "input" event should be fired with
+  // Event, set to false.
+  [ChromeOnly]
+  readonly attribute boolean isInputEventTarget;
+
+  // This is similar to set .value on nsIDOMInput/TextAreaElements, but handling
+  // of the value change is closer to the normal user input, so 'change' event
+  // for example will be dispatched when focusing out the element.
+  [Func="IsChromeOrUAWidget", NeedsSubjectPrincipal]
+  undefined setUserInput(DOMString input);
+};
+
+HTMLInputElement includes MozEditableElement;
+
+HTMLInputElement includes MozImageLoadingContent;
+
+HTMLInputElement includes PopoverInvokerElement;
+
+// https://wicg.github.io/entries-api/#idl-index
+partial interface HTMLInputElement {
+  [Pref="dom.webkitBlink.filesystem.enabled", Frozen, Cached, Pure]
+  readonly attribute sequence<FileSystemEntry> webkitEntries;
+
+  [Pref="dom.webkitBlink.dirPicker.enabled", BinaryName="WebkitDirectoryAttr", SetterThrows]
+          attribute boolean webkitdirectory;
+};
+
+dictionary DateTimeValue {
+  long hour;
+  long minute;
+  long year;
+  long month;
+  long day;
+};
+
+partial interface HTMLInputElement {
+  [ChromeOnly]
+  DateTimeValue getDateTimeInputBoxValue();
+
+  [ChromeOnly]
+  readonly attribute Element? dateTimeBoxElement;
+
+  [ChromeOnly, BinaryName="getMinimumAsDouble"]
+  double getMinimum();
+
+  [ChromeOnly, BinaryName="getMaximumAsDouble"]
+  double getMaximum();
+
+  [Func="IsChromeOrUAWidget"]
+  undefined openDateTimePicker(optional DateTimeValue initialValue = {});
+
+  [Func="IsChromeOrUAWidget"]
+  undefined updateDateTimePicker(optional DateTimeValue value = {});
+
+  [Func="IsChromeOrUAWidget"]
+  undefined closeDateTimePicker();
+
+  [Func="IsChromeOrUAWidget"]
+  undefined setFocusState(boolean aIsFocused);
+
+  [Func="IsChromeOrUAWidget"]
+  undefined updateValidityState();
+
+  [Func="IsChromeOrUAWidget", BinaryName="getStepAsDouble"]
+  double getStep();
+
+  [Func="IsChromeOrUAWidget", BinaryName="getStepBaseAsDouble"]
+  double getStepBase();
+};
diff --git a/dom/webidl/HTMLLIElement.webidl b/dom/webidl/HTMLLIElement.webidl
new file mode 100644
index 0000000000..f6a667102f
--- /dev/null
+++ b/dom/webidl/HTMLLIElement.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-li-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-li-element
+[Exposed=Window]
+interface HTMLLIElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows, Pure]
+           attribute long value;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLLIElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+};
diff --git a/dom/webidl/HTMLLabelElement.webidl b/dom/webidl/HTMLLabelElement.webidl
new file mode 100644
index 0000000000..6f78a19339
--- /dev/null
+++ b/dom/webidl/HTMLLabelElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLLabelElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  readonly attribute HTMLFormElement? form;
+  [CEReactions]
+           attribute DOMString htmlFor;
+  readonly attribute HTMLElement? control;
+};
diff --git a/dom/webidl/HTMLLegendElement.webidl b/dom/webidl/HTMLLegendElement.webidl
new file mode 100644
index 0000000000..075af8b1a9
--- /dev/null
+++ b/dom/webidl/HTMLLegendElement.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-legend-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-legend-element
+[Exposed=Window]
+interface HTMLLegendElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  readonly attribute HTMLFormElement? form;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLLegendElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+};
diff --git a/dom/webidl/HTMLLinkElement.webidl b/dom/webidl/HTMLLinkElement.webidl
new file mode 100644
index 0000000000..7f0ecb4f16
--- /dev/null
+++ b/dom/webidl/HTMLLinkElement.webidl
@@ -0,0 +1,65 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-link-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-link-element
+[Exposed=Window]
+interface HTMLLinkElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean disabled;
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows, Pure]
+           attribute DOMString href;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString? crossOrigin;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString rel;
+  [PutForwards=value]
+  readonly attribute DOMTokenList relList;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString media;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString hreflang;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString referrerPolicy;
+  [PutForwards=value] readonly attribute DOMTokenList sizes;
+  [CEReactions, SetterThrows, Pure]
+           attribute USVString imageSrcset;
+  [CEReactions, SetterThrows, Pure]
+           attribute USVString imageSizes;
+};
+HTMLLinkElement includes LinkStyle;
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLLinkElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString charset;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString rev;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString target;
+};
+
+// https://w3c.github.io/webappsec/specs/subresourceintegrity/#htmllinkelement-1
+partial interface HTMLLinkElement {
+  [CEReactions, SetterThrows]
+  attribute DOMString integrity;
+};
+
+//https://w3c.github.io/preload/
+partial interface HTMLLinkElement {
+  [SetterThrows, Pure]
+           attribute DOMString as;
+};
diff --git a/dom/webidl/HTMLMapElement.webidl b/dom/webidl/HTMLMapElement.webidl
new file mode 100644
index 0000000000..038fd108e1
--- /dev/null
+++ b/dom/webidl/HTMLMapElement.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-map-element
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-map-element
+[Exposed=Window]
+interface HTMLMapElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+  [Constant]
+  readonly attribute HTMLCollection areas;
+  // Not supported yet.
+  //readonly attribute HTMLCollection images;
+};
diff --git a/dom/webidl/HTMLMarqueeElement.webidl b/dom/webidl/HTMLMarqueeElement.webidl
new file mode 100644
index 0000000000..58bc8416f9
--- /dev/null
+++ b/dom/webidl/HTMLMarqueeElement.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/obsolete.html#the-marquee-element
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// https://html.spec.whatwg.org/multipage/obsolete.html#the-marquee-element
+
+[Exposed=Window]
+interface HTMLMarqueeElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows] attribute DOMString behavior;
+  [CEReactions, SetterThrows] attribute DOMString bgColor;
+  [CEReactions, SetterThrows] attribute DOMString direction;
+  [CEReactions, SetterThrows] attribute DOMString height;
+  [CEReactions, SetterThrows] attribute unsigned long hspace;
+  [CEReactions, SetterThrows] attribute long loop;
+  [CEReactions, SetterThrows] attribute unsigned long scrollAmount;
+  [CEReactions, SetterThrows] attribute unsigned long scrollDelay;
+  [CEReactions, SetterThrows] attribute boolean trueSpeed;
+  [CEReactions, SetterThrows] attribute unsigned long vspace;
+  [CEReactions, SetterThrows] attribute DOMString width;
+
+  attribute EventHandler onbounce;
+  attribute EventHandler onfinish;
+  attribute EventHandler onstart;
+
+  undefined start();
+  undefined stop();
+};
diff --git a/dom/webidl/HTMLMediaElement.webidl b/dom/webidl/HTMLMediaElement.webidl
new file mode 100644
index 0000000000..dd37d221ba
--- /dev/null
+++ b/dom/webidl/HTMLMediaElement.webidl
@@ -0,0 +1,293 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#media-elements
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLMediaElement : HTMLElement {
+
+  // error state
+  readonly attribute MediaError? error;
+
+  // network state
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString src;
+  readonly attribute DOMString currentSrc;
+
+  [CEReactions, SetterThrows]
+           attribute DOMString? crossOrigin;
+  const unsigned short NETWORK_EMPTY = 0;
+  const unsigned short NETWORK_IDLE = 1;
+  const unsigned short NETWORK_LOADING = 2;
+  const unsigned short NETWORK_NO_SOURCE = 3;
+  readonly attribute unsigned short networkState;
+  [CEReactions, SetterThrows]
+           attribute DOMString preload;
+  [NewObject]
+  readonly attribute TimeRanges buffered;
+  undefined load();
+  DOMString canPlayType(DOMString type);
+
+  // ready state
+  const unsigned short HAVE_NOTHING = 0;
+  const unsigned short HAVE_METADATA = 1;
+  const unsigned short HAVE_CURRENT_DATA = 2;
+  const unsigned short HAVE_FUTURE_DATA = 3;
+  const unsigned short HAVE_ENOUGH_DATA = 4;
+  readonly attribute unsigned short readyState;
+  readonly attribute boolean seeking;
+
+  // playback state
+  [SetterThrows]
+           attribute double currentTime;
+  [Throws]
+  undefined fastSeek(double time);
+  readonly attribute unrestricted double duration;
+  [ChromeOnly]
+  readonly attribute boolean isEncrypted;
+  // TODO: Bug 847376 - readonly attribute any startDate;
+  readonly attribute boolean paused;
+  [SetterThrows]
+           attribute double defaultPlaybackRate;
+  [SetterThrows]
+           attribute double playbackRate;
+  [NewObject]
+  readonly attribute TimeRanges played;
+  [NewObject]
+  readonly attribute TimeRanges seekable;
+  readonly attribute boolean ended;
+  [CEReactions, SetterThrows]
+           attribute boolean autoplay;
+  [CEReactions, SetterThrows]
+           attribute boolean loop;
+  [NewObject]
+  Promise<undefined> play();
+  [Throws]
+  undefined pause();
+
+  // TODO: Bug 847377 - mediaGroup and MediaController
+  // media controller
+  //         attribute DOMString mediaGroup;
+  //         attribute MediaController? controller;
+
+  // controls
+  [CEReactions, SetterThrows]
+           attribute boolean controls;
+  [SetterThrows]
+           attribute double volume;
+           attribute boolean muted;
+  [CEReactions, SetterThrows]
+           attribute boolean defaultMuted;
+
+  // TODO: Bug 847379
+  // tracks
+  [Pref="media.track.enabled"]
+  readonly attribute AudioTrackList audioTracks;
+  [Pref="media.track.enabled"]
+  readonly attribute VideoTrackList videoTracks;
+  readonly attribute TextTrackList? textTracks;
+  TextTrack addTextTrack(TextTrackKind kind,
+                         optional DOMString label = "",
+                         optional DOMString language = "");
+};
+
+// Mozilla extensions:
+partial interface HTMLMediaElement {
+  [Func="HasDebuggerOrTabsPrivilege"]
+  readonly attribute MediaSource? mozMediaSourceObject;
+
+  [Func="HasDebuggerOrTabsPrivilege", NewObject]
+  Promise<HTMLMediaElementDebugInfo> mozRequestDebugInfo();
+
+  [Func="HasDebuggerOrTabsPrivilege", NewObject]
+  static undefined mozEnableDebugLog();
+  [Func="HasDebuggerOrTabsPrivilege", NewObject]
+  Promise<DOMString> mozRequestDebugLog();
+
+  attribute MediaStream? srcObject;
+
+  // TODO: Remove mozPreservesPitch. (bug 1765201)
+  [Deprecated="MozPreservesPitchDeprecatedPrefix",
+   Pref="dom.media.mozPreservesPitch.enabled",
+   BinaryName="preservesPitch"]
+  attribute boolean mozPreservesPitch;
+  attribute boolean preservesPitch;
+
+  // NB: for internal use with the video controls:
+  [Func="IsChromeOrUAWidget"] attribute boolean mozAllowCasting;
+  [Func="IsChromeOrUAWidget"] attribute boolean mozIsCasting;
+
+  // Mozilla extension: stream capture
+  [Throws]
+  MediaStream mozCaptureStream();
+  [Throws]
+  MediaStream mozCaptureStreamUntilEnded();
+  readonly attribute boolean mozAudioCaptured;
+
+  // Mozilla extension: return embedded metadata from the stream as a
+  // JSObject with key:value pairs for each tag. This can be used by
+  // player interfaces to display the song title, artist, etc.
+  [Throws]
+  object? mozGetMetadata();
+
+  // Mozilla extension: provides access to the fragment end time if
+  // the media element has a fragment URI for the currentSrc, otherwise
+  // it is equal to the media duration.
+  readonly attribute double mozFragmentEnd;
+};
+
+// Encrypted Media Extensions
+partial interface HTMLMediaElement {
+  readonly attribute MediaKeys? mediaKeys;
+
+  // undefined, not any: https://www.w3.org/Bugs/Public/show_bug.cgi?id=26457
+  [NewObject]
+  Promise<undefined> setMediaKeys(MediaKeys? mediaKeys);
+
+  attribute EventHandler onencrypted;
+
+  attribute EventHandler onwaitingforkey;
+};
+
+/**
+ * These attributes are general testing attributes and they should only be used
+ * in tests.
+ */
+partial interface HTMLMediaElement {
+  [Pref="media.useAudioChannelService.testing"]
+  readonly attribute double computedVolume;
+
+  [Pref="media.useAudioChannelService.testing"]
+  readonly attribute boolean computedMuted;
+
+  // Return true if the media is suspended because its document is inactive or
+  // the docshell is inactive and explicitly being set to prohibit all media
+  // from playing.
+  [ChromeOnly]
+  readonly attribute boolean isSuspendedByInactiveDocOrDocShell;
+};
+
+/*
+ * HTMLMediaElement::seekToNextFrame() is a Mozilla experimental feature.
+ *
+ * The SeekToNextFrame() method provides a way to access a video element's video
+ * frames one by one without going through the realtime playback. So, it lets
+ * authors use "frame" as unit to access the video element's underlying data,
+ * instead of "time".
+ *
+ * The SeekToNextFrame() is a kind of seek operation, so normally, once it is
+ * invoked, a "seeking" event is dispatched. However, if the media source has no
+ * video data or is not seekable, the operation is ignored without filing the
+ * "seeking" event.
+ *
+ * Once the SeekToNextFrame() is done, a "seeked" event should always be filed
+ * and a "ended" event might also be filed depends on where the media element's
+ * position before seeking was. There are two cases:
+ * Assume the media source has n+1 video frames where n is a non-negative
+ * integers and the frame sequence is indexed from zero.
+ * (1) If the currentTime is at anywhere smaller than the n-th frame's beginning
+ *     time, say the currentTime is now pointing to a position which is smaller
+ *     than the x-th frame's beginning time and larger or equal to the (x-1)-th
+ *     frame's beginning time, where x belongs to [1, n], then the
+ *     SeekToNextFrame() operation seeks the media to the x-th frame, sets the
+ *     media's currentTime to the x-th frame's beginning time and dispatches a
+ *     "seeked" event.
+ * (2) Otherwise, if the currentTime is larger or equal to the n-th frame's
+ *     beginning time, then the SeekToNextFrame() operation sets the media's
+ *     currentTime to the duration of the media source and dispatches a "seeked"
+ *     event and an "ended" event.
+ */
+partial interface HTMLMediaElement {
+  [NewObject, Pref="media.seekToNextFrame.enabled"]
+  Promise<undefined> seekToNextFrame();
+};
+
+/* Internal testing only API */
+partial interface HTMLMediaElement {
+  // These APIs are used to simulate visibility changes to help debug and write
+  // tests about suspend-video-decoding.
+  // - SetVisible() is for simulating visibility changes.
+  // - HasSuspendTaint() is for querying that the element's decoder cannot suspend
+  //   video decoding because it has been tainted by an operation, such as
+  //   drawImage().
+  // - isInViewPort is a boolean value which indicate whether media element is
+  //   in view port.
+  // - isVideoDecodingSuspended() is used to know whether video decoding has
+  //   suspended.
+  [Pref="media.test.video-suspend"]
+  undefined setVisible(boolean aVisible);
+
+  [Pref="media.test.video-suspend"]
+  boolean hasSuspendTaint();
+
+  [ChromeOnly]
+  readonly attribute boolean isInViewPort;
+
+  [ChromeOnly]
+  readonly attribute boolean isVideoDecodingSuspended;
+
+  [ChromeOnly]
+  readonly attribute double totalVideoPlayTime;
+
+  [ChromeOnly]
+  readonly attribute double totalVideoHDRPlayTime;
+
+  [ChromeOnly]
+  readonly attribute double visiblePlayTime;
+
+  [ChromeOnly]
+  readonly attribute double invisiblePlayTime;
+
+  [ChromeOnly]
+  readonly attribute double videoDecodeSuspendedTime;
+
+  [ChromeOnly]
+  readonly attribute double totalAudioPlayTime;
+
+  [ChromeOnly]
+  readonly attribute double audiblePlayTime;
+
+  [ChromeOnly]
+  readonly attribute double inaudiblePlayTime;
+
+  [ChromeOnly]
+  readonly attribute double mutedPlayTime;
+
+  // These APIs are used for decoder doctor tests.
+  [ChromeOnly]
+  undefined setFormatDiagnosticsReportForMimeType(DOMString mimeType, DecoderDoctorReportType error);
+
+  [Throws, ChromeOnly]
+  undefined setDecodeError(DOMString error);
+
+  [ChromeOnly]
+  undefined setAudioSinkFailedStartup();
+};
+
+/* Audio Output Devices API
+ * https://w3c.github.io/mediacapture-output/
+ */
+partial interface HTMLMediaElement {
+  [SecureContext, Pref="media.setsinkid.enabled"]
+  readonly attribute DOMString sinkId;
+  [NewObject, SecureContext, Pref="media.setsinkid.enabled"]
+  Promise<undefined> setSinkId(DOMString sinkId);
+};
+
+/*
+ * API that exposes whether a call to HTMLMediaElement.play() would be
+ * blocked by autoplay policies; whether the promise returned by play()
+ * would be rejected with NotAllowedError.
+ */
+partial interface HTMLMediaElement {
+  [Pref="media.allowed-to-play.enabled"]
+  readonly attribute boolean allowedToPlay;
+};
diff --git a/dom/webidl/HTMLMenuElement.webidl b/dom/webidl/HTMLMenuElement.webidl
new file mode 100644
index 0000000000..6fdfd5a1b9
--- /dev/null
+++ b/dom/webidl/HTMLMenuElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/grouping-content.html#the-menu-element
+ * https://html.spec.whatwg.org/multipage/obsolete.html#HTMLMenuElement-partial
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// https://html.spec.whatwg.org/multipage/grouping-content.html#the-menu-element
+[Exposed=Window]
+interface HTMLMenuElement : HTMLElement {
+  [HTMLConstructor] constructor();
+};
+
+// https://html.spec.whatwg.org/multipage/obsolete.html#HTMLMenuElement-partial
+partial interface HTMLMenuElement {
+           [CEReactions, SetterThrows]
+           attribute boolean compact;
+};
diff --git a/dom/webidl/HTMLMetaElement.webidl b/dom/webidl/HTMLMetaElement.webidl
new file mode 100644
index 0000000000..1598ea37f6
--- /dev/null
+++ b/dom/webidl/HTMLMetaElement.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-meta-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// https://html.spec.whatwg.org/#the-meta-element
+[Exposed=Window]
+interface HTMLMetaElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString httpEquiv;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString content;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString media;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLMetaElement {
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString scheme;
+};
diff --git a/dom/webidl/HTMLMeterElement.webidl b/dom/webidl/HTMLMeterElement.webidl
new file mode 100644
index 0000000000..a9d3a18150
--- /dev/null
+++ b/dom/webidl/HTMLMeterElement.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-meter-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-meter-element
+[Exposed=Window]
+interface HTMLMeterElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute double value;
+           [CEReactions, SetterThrows]
+           attribute double min;
+           [CEReactions, SetterThrows]
+           attribute double max;
+           [CEReactions, SetterThrows]
+           attribute double low;
+           [CEReactions, SetterThrows]
+           attribute double high;
+           [CEReactions, SetterThrows]
+           attribute double optimum;
+           readonly attribute NodeList labels;
+};
diff --git a/dom/webidl/HTMLModElement.webidl b/dom/webidl/HTMLModElement.webidl
new file mode 100644
index 0000000000..afc040123b
--- /dev/null
+++ b/dom/webidl/HTMLModElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#attributes-common-to-ins-and-del-elements
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#attributes-common-to-ins-and-del-elements
+[Exposed=Window]
+interface HTMLModElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString cite;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString dateTime;
+};
diff --git a/dom/webidl/HTMLOListElement.webidl b/dom/webidl/HTMLOListElement.webidl
new file mode 100644
index 0000000000..269c4bfd1e
--- /dev/null
+++ b/dom/webidl/HTMLOListElement.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-ol-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-ol-element
+[Exposed=Window]
+interface HTMLOListElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute boolean reversed;
+           [CEReactions, SetterThrows]
+           attribute long start;
+           [CEReactions, SetterThrows]
+           attribute DOMString type;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLOListElement {
+           [CEReactions, SetterThrows]
+           attribute boolean compact;
+};
diff --git a/dom/webidl/HTMLObjectElement.webidl b/dom/webidl/HTMLObjectElement.webidl
new file mode 100644
index 0000000000..b6b40be912
--- /dev/null
+++ b/dom/webidl/HTMLObjectElement.webidl
@@ -0,0 +1,165 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-object-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#HTMLObjectElement-partial
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-object-element
+[NeedResolve,
+ Exposed=Window]
+interface HTMLObjectElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString data;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString type;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString name;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString useMap;
+  [Pure]
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString width;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString height;
+  // Not pure: can trigger about:blank instantiation
+  [NeedsSubjectPrincipal]
+  readonly attribute Document? contentDocument;
+  // Not pure: can trigger about:blank instantiation
+  [NeedsSubjectPrincipal]
+  readonly attribute WindowProxy? contentWindow;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  undefined setCustomValidity(DOMString error);
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#HTMLObjectElement-partial
+partial interface HTMLObjectElement {
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString align;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString archive;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString code;
+  [CEReactions, Pure, SetterThrows]
+           attribute boolean declare;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long hspace;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString standby;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long vspace;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString codeBase;
+  [CEReactions, Pure, SetterThrows]
+           attribute DOMString codeType;
+
+  [CEReactions, Pure, SetterThrows]
+           attribute [LegacyNullToEmptyString] DOMString border;
+};
+
+partial interface HTMLObjectElement {
+  // GetSVGDocument
+  [NeedsSubjectPrincipal]
+  Document? getSVGDocument();
+};
+
+interface mixin MozObjectLoadingContent {
+  // Mirrored chrome-only scriptable nsIObjectLoadingContent methods.  Please
+  // make sure to update this list if nsIObjectLoadingContent changes.  Also,
+  // make sure everything on here is [ChromeOnly].
+  [ChromeOnly]
+  const unsigned long TYPE_LOADING     = 0;
+  [ChromeOnly]
+  const unsigned long TYPE_IMAGE       = 1;
+  [ChromeOnly]
+  const unsigned long TYPE_FALLBACK    = 2;
+  [ChromeOnly]
+  const unsigned long TYPE_FAKE_PLUGIN = 3;
+  [ChromeOnly]
+  const unsigned long TYPE_DOCUMENT    = 4;
+  [ChromeOnly]
+  const unsigned long TYPE_NULL        = 5;
+
+  /**
+   * The actual mime type (the one we got back from the network
+   * request) for the element.
+   */
+  [ChromeOnly]
+  readonly attribute DOMString actualType;
+
+  /**
+   * Gets the type of the content that's currently loaded. See
+   * the constants above for the list of possible values.
+   */
+  [ChromeOnly]
+  readonly attribute unsigned long displayedType;
+
+  /**
+   * Gets the content type that corresponds to the give MIME type.  See the
+   * constants above for the list of possible values.  If nothing else fits,
+   * TYPE_NULL will be returned.
+   */
+  [ChromeOnly]
+  unsigned long getContentTypeForMIMEType(DOMString aMimeType);
+
+
+  [ChromeOnly]
+  sequence<MozPluginParameter> getPluginAttributes();
+
+  [ChromeOnly]
+  sequence<MozPluginParameter> getPluginParameters();
+
+  /**
+   * Forces a re-evaluation and reload of the tag, optionally invalidating its
+   * click-to-play state.  This can be used when the MIME type that provides a
+   * type has changed, for instance, to force the tag to re-evalulate the
+   * handler to use.
+   */
+  [ChromeOnly, Throws]
+  undefined reload(boolean aClearActivation);
+
+  /**
+   * The URL of the data/src loaded in the object. This may be null (i.e.
+   * an <embed> with no src).
+   */
+  [ChromeOnly]
+  readonly attribute URI? srcURI;
+
+  /**
+   * Disable the use of fake plugins and reload the tag if necessary
+   */
+  [ChromeOnly, Throws]
+  undefined skipFakePlugins();
+
+  [ChromeOnly, Throws, NeedsCallerType]
+  readonly attribute unsigned long runID;
+};
+
+/**
+ * Name:Value pair type used for passing parameters to NPAPI or javascript
+ * plugins.
+ */
+dictionary MozPluginParameter {
+  DOMString name = "";
+  DOMString value = "";
+};
+
+HTMLObjectElement includes MozImageLoadingContent;
+HTMLObjectElement includes MozFrameLoaderOwner;
+HTMLObjectElement includes MozObjectLoadingContent;
diff --git a/dom/webidl/HTMLOptGroupElement.webidl b/dom/webidl/HTMLOptGroupElement.webidl
new file mode 100644
index 0000000000..926c59a31d
--- /dev/null
+++ b/dom/webidl/HTMLOptGroupElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-optgroup-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLOptGroupElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute boolean disabled;
+           [CEReactions, SetterThrows]
+           attribute DOMString label;
+};
diff --git a/dom/webidl/HTMLOptionElement.webidl b/dom/webidl/HTMLOptionElement.webidl
new file mode 100644
index 0000000000..277ff8ad10
--- /dev/null
+++ b/dom/webidl/HTMLOptionElement.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-option-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[LegacyFactoryFunction=Option(optional DOMString text = "", optional DOMString value, optional boolean defaultSelected = false, optional boolean selected = false),
+ Exposed=Window]
+interface HTMLOptionElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows]
+  attribute boolean disabled;
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows]
+  attribute DOMString label;
+  [CEReactions, SetterThrows]
+  attribute boolean defaultSelected;
+  attribute boolean selected;
+  [CEReactions, SetterThrows]
+  attribute DOMString value;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString text;
+  readonly attribute long index;
+};
diff --git a/dom/webidl/HTMLOptionsCollection.webidl b/dom/webidl/HTMLOptionsCollection.webidl
new file mode 100644
index 0000000000..dc2302b641
--- /dev/null
+++ b/dom/webidl/HTMLOptionsCollection.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-html5-20120329/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface HTMLOptionsCollection : HTMLCollection {
+  [CEReactions, SetterThrows]
+  attribute unsigned long length;
+  [CEReactions, Throws]
+  setter undefined (unsigned long index, HTMLOptionElement? option);
+  [CEReactions, Throws]
+  undefined add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
+  [CEReactions]
+  undefined remove(long index);
+  attribute long selectedIndex;
+};
diff --git a/dom/webidl/HTMLOutputElement.webidl b/dom/webidl/HTMLOutputElement.webidl
new file mode 100644
index 0000000000..a218242432
--- /dev/null
+++ b/dom/webidl/HTMLOutputElement.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-output-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-output-element
+[Exposed=Window]
+interface HTMLOutputElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [PutForwards=value, Constant]
+  readonly attribute DOMTokenList htmlFor;
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+
+  [Constant]
+  readonly attribute DOMString type;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString defaultValue;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString value;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  undefined setCustomValidity(DOMString error);
+
+  readonly attribute NodeList labels;
+};
diff --git a/dom/webidl/HTMLParagraphElement.webidl b/dom/webidl/HTMLParagraphElement.webidl
new file mode 100644
index 0000000000..f5d0bfd36a
--- /dev/null
+++ b/dom/webidl/HTMLParagraphElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-p-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-p-element
+[Exposed=Window]
+interface HTMLParagraphElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLParagraphElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+};
diff --git a/dom/webidl/HTMLParamElement.webidl b/dom/webidl/HTMLParamElement.webidl
new file mode 100644
index 0000000000..1fadfc6da6
--- /dev/null
+++ b/dom/webidl/HTMLParamElement.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-param-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-param-element
+[Exposed=Window]
+interface HTMLParamElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString value;
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLParamElement {
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString valueType;
+};
diff --git a/dom/webidl/HTMLPictureElement.webidl b/dom/webidl/HTMLPictureElement.webidl
new file mode 100644
index 0000000000..520ff9e011
--- /dev/null
+++ b/dom/webidl/HTMLPictureElement.webidl
@@ -0,0 +1,11 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface HTMLPictureElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+};
diff --git a/dom/webidl/HTMLPreElement.webidl b/dom/webidl/HTMLPreElement.webidl
new file mode 100644
index 0000000000..f13fc85195
--- /dev/null
+++ b/dom/webidl/HTMLPreElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-pre-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-pre-element
+[Exposed=Window]
+interface HTMLPreElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLPreElement {
+           [CEReactions, SetterThrows]
+           attribute long width;
+};
diff --git a/dom/webidl/HTMLProgressElement.webidl b/dom/webidl/HTMLProgressElement.webidl
new file mode 100644
index 0000000000..e5326375ff
--- /dev/null
+++ b/dom/webidl/HTMLProgressElement.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-progress-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLProgressElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute double value;
+           [CEReactions, SetterThrows]
+           attribute double max;
+  readonly attribute double position;
+  readonly attribute NodeList labels;
+};
diff --git a/dom/webidl/HTMLQuoteElement.webidl b/dom/webidl/HTMLQuoteElement.webidl
new file mode 100644
index 0000000000..08498e5174
--- /dev/null
+++ b/dom/webidl/HTMLQuoteElement.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-blockquote-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-blockquote-element
+[Exposed=Window]
+interface HTMLQuoteElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString cite;
+};
diff --git a/dom/webidl/HTMLScriptElement.webidl b/dom/webidl/HTMLScriptElement.webidl
new file mode 100644
index 0000000000..f8b7d269dd
--- /dev/null
+++ b/dom/webidl/HTMLScriptElement.webidl
@@ -0,0 +1,49 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-script-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ */
+
+[Exposed=Window]
+interface HTMLScriptElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+  attribute DOMString src;
+  [CEReactions, SetterThrows]
+  attribute DOMString type;
+  [CEReactions, SetterThrows, Pref="dom.moduleScripts.enabled"]
+  attribute boolean noModule;
+  [CEReactions, SetterThrows]
+  attribute DOMString charset;
+  [CEReactions, SetterThrows]
+  attribute boolean async;
+  [CEReactions, SetterThrows]
+  attribute boolean defer;
+  [CEReactions, SetterThrows]
+  attribute DOMString? crossOrigin;
+  [CEReactions, SetterThrows]
+  attribute DOMString referrerPolicy;
+  [CEReactions, Throws]
+  attribute DOMString text;
+
+  static boolean supports(DOMString type);
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLScriptElement {
+  [CEReactions, SetterThrows]
+  attribute DOMString event;
+  [CEReactions, SetterThrows]
+  attribute DOMString htmlFor;
+};
+
+// https://w3c.github.io/webappsec/specs/subresourceintegrity/#htmlscriptelement-1
+partial interface HTMLScriptElement {
+  [CEReactions, SetterThrows]
+  attribute DOMString integrity;
+};
diff --git a/dom/webidl/HTMLSelectElement.webidl b/dom/webidl/HTMLSelectElement.webidl
new file mode 100644
index 0000000000..bd352adb96
--- /dev/null
+++ b/dom/webidl/HTMLSelectElement.webidl
@@ -0,0 +1,78 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/html/#the-select-element
+ */
+
+[Exposed=Window]
+interface HTMLSelectElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString autocomplete;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean disabled;
+  [Pure]
+  readonly attribute HTMLFormElement? form;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean multiple;
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString name;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean required;
+  [CEReactions, SetterThrows, Pure]
+  attribute unsigned long size;
+
+  [ChromeOnly, Pure]
+  readonly attribute boolean isCombobox;
+
+  [Pure]
+  readonly attribute DOMString type;
+
+  [Constant]
+  readonly attribute HTMLOptionsCollection options;
+  [CEReactions, SetterThrows, Pure]
+  attribute unsigned long length;
+  getter Element? item(unsigned long index);
+  HTMLOptionElement? namedItem(DOMString name);
+  [CEReactions, Throws]
+  undefined add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
+  [CEReactions]
+  undefined remove(long index);
+  [CEReactions, Throws]
+  setter undefined (unsigned long index, HTMLOptionElement? option);
+
+  readonly attribute HTMLCollection selectedOptions;
+  [Pure]
+  attribute long selectedIndex;
+  [Pure]
+  attribute DOMString value;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  undefined setCustomValidity(DOMString error);
+
+  readonly attribute NodeList labels;
+
+  // https://www.w3.org/Bugs/Public/show_bug.cgi?id=20720
+  [CEReactions]
+  undefined remove();
+};
+
+// Chrome only interface
+
+partial interface HTMLSelectElement {
+  [ChromeOnly]
+  attribute boolean openInParentProcess;
+  [ChromeOnly]
+  AutocompleteInfo getAutocompleteInfo();
+  [ChromeOnly]
+  attribute DOMString previewValue;
+};
diff --git a/dom/webidl/HTMLSlotElement.webidl b/dom/webidl/HTMLSlotElement.webidl
new file mode 100644
index 0000000000..e92afa2f26
--- /dev/null
+++ b/dom/webidl/HTMLSlotElement.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/forms.html#the-dialog-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLSlotElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows] attribute DOMString name;
+  sequence<Node> assignedNodes(optional AssignedNodesOptions options = {});
+  sequence<Element> assignedElements(optional AssignedNodesOptions options = {});
+  [Pref="dom.shadowdom.slot.assign.enabled"]
+  undefined assign((Element or Text)... nodes);
+};
+
+dictionary AssignedNodesOptions {
+  boolean flatten = false;
+};
diff --git a/dom/webidl/HTMLSourceElement.webidl b/dom/webidl/HTMLSourceElement.webidl
new file mode 100644
index 0000000000..894166b6cd
--- /dev/null
+++ b/dom/webidl/HTMLSourceElement.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-source-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLSourceElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString src;
+           [CEReactions, SetterThrows]
+           attribute DOMString type;
+};
+
+partial interface HTMLSourceElement {
+           [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+           attribute DOMString srcset;
+           [CEReactions, SetterThrows]
+           attribute DOMString sizes;
+           [CEReactions, SetterThrows]
+           attribute DOMString media;
+           [CEReactions, SetterThrows,
+            Pref="dom.picture_source_dimension_attributes.enabled"]
+           attribute unsigned long width;
+           [CEReactions, SetterThrows,
+            Pref="dom.picture_source_dimension_attributes.enabled"]
+           attribute unsigned long height;
+};
diff --git a/dom/webidl/HTMLSpanElement.webidl b/dom/webidl/HTMLSpanElement.webidl
new file mode 100644
index 0000000000..e9215bc37a
--- /dev/null
+++ b/dom/webidl/HTMLSpanElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-span-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-span-element
+[Exposed=Window, ProbablyShortLivingWrapper]
+interface HTMLSpanElement : HTMLElement {
+  [HTMLConstructor] constructor();
+};
diff --git a/dom/webidl/HTMLStyleElement.webidl b/dom/webidl/HTMLStyleElement.webidl
new file mode 100644
index 0000000000..ea63d233c9
--- /dev/null
+++ b/dom/webidl/HTMLStyleElement.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-style-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ */
+
+[Exposed=Window]
+interface HTMLStyleElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [Pure]
+           attribute boolean disabled;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString media;
+           [CEReactions, SetterThrows, Pure]
+           attribute DOMString type;
+};
+HTMLStyleElement includes LinkStyle;
+
+// Mozilla-specific additions to support devtools
+partial interface HTMLStyleElement {
+  /**
+   * Mark this style element with a devtools-specific principal that
+   * skips Content Security Policy unsafe-inline checks. This triggering
+   * principal will be overwritten by any callers that set textContent
+   * or innerHTML on this element.
+   */
+  [ChromeOnly]
+  undefined setDevtoolsAsTriggeringPrincipal();
+};
diff --git a/dom/webidl/HTMLTableCaptionElement.webidl b/dom/webidl/HTMLTableCaptionElement.webidl
new file mode 100644
index 0000000000..6112fe6f31
--- /dev/null
+++ b/dom/webidl/HTMLTableCaptionElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLTableCaptionElement : HTMLElement {
+  [HTMLConstructor] constructor();
+};
+
+partial interface HTMLTableCaptionElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+};
diff --git a/dom/webidl/HTMLTableCellElement.webidl b/dom/webidl/HTMLTableCellElement.webidl
new file mode 100644
index 0000000000..29ac38a25e
--- /dev/null
+++ b/dom/webidl/HTMLTableCellElement.webidl
@@ -0,0 +1,55 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLTableCellElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute unsigned long colSpan;
+           [CEReactions, SetterThrows]
+           attribute unsigned long rowSpan;
+  //[PutForwards=value] readonly attribute DOMTokenList headers;
+           [CEReactions, SetterThrows]
+           attribute DOMString headers;
+  readonly attribute long cellIndex;
+
+  // Mozilla-specific extensions
+           [CEReactions, SetterThrows]
+           attribute DOMString abbr;
+           [CEReactions, SetterThrows]
+           attribute DOMString scope;
+};
+
+partial interface HTMLTableCellElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString axis;
+           [CEReactions, SetterThrows]
+           attribute DOMString height;
+           [CEReactions, SetterThrows]
+           attribute DOMString width;
+
+           [CEReactions, SetterThrows]
+           attribute DOMString ch;
+           [CEReactions, SetterThrows]
+           attribute DOMString chOff;
+           [CEReactions, SetterThrows]
+           attribute boolean noWrap;
+           [CEReactions, SetterThrows]
+           attribute DOMString vAlign;
+
+           [CEReactions, SetterThrows]
+           attribute [LegacyNullToEmptyString] DOMString bgColor;
+};
diff --git a/dom/webidl/HTMLTableColElement.webidl b/dom/webidl/HTMLTableColElement.webidl
new file mode 100644
index 0000000000..c17a78c925
--- /dev/null
+++ b/dom/webidl/HTMLTableColElement.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLTableColElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute unsigned long span;
+};
+
+partial interface HTMLTableColElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString ch;
+           [CEReactions, SetterThrows]
+           attribute DOMString chOff;
+           [CEReactions, SetterThrows]
+           attribute DOMString vAlign;
+           [CEReactions, SetterThrows]
+           attribute DOMString width;
+};
diff --git a/dom/webidl/HTMLTableElement.webidl b/dom/webidl/HTMLTableElement.webidl
new file mode 100644
index 0000000000..59f7e7bf41
--- /dev/null
+++ b/dom/webidl/HTMLTableElement.webidl
@@ -0,0 +1,64 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLTableElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute HTMLTableCaptionElement? caption;
+  HTMLElement createCaption();
+  [CEReactions]
+  undefined deleteCaption();
+           [CEReactions, SetterThrows]
+           attribute HTMLTableSectionElement? tHead;
+  HTMLElement createTHead();
+  [CEReactions]
+  undefined deleteTHead();
+           [CEReactions, SetterThrows]
+           attribute HTMLTableSectionElement? tFoot;
+  HTMLElement createTFoot();
+  [CEReactions]
+  undefined deleteTFoot();
+  readonly attribute HTMLCollection tBodies;
+  HTMLElement createTBody();
+  readonly attribute HTMLCollection rows;
+  [Throws]
+  HTMLElement insertRow(optional long index = -1);
+  [CEReactions, Throws]
+  undefined deleteRow(long index);
+  //         attribute boolean sortable;
+  //undefined stopSorting();
+};
+
+partial interface HTMLTableElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString border;
+           [CEReactions, SetterThrows]
+           attribute DOMString frame;
+           [CEReactions, SetterThrows]
+           attribute DOMString rules;
+           [CEReactions, SetterThrows]
+           attribute DOMString summary;
+           [CEReactions, SetterThrows]
+           attribute DOMString width;
+
+  [CEReactions, SetterThrows]
+           attribute [LegacyNullToEmptyString] DOMString bgColor;
+  [CEReactions, SetterThrows]
+           attribute [LegacyNullToEmptyString] DOMString cellPadding;
+  [CEReactions, SetterThrows]
+           attribute [LegacyNullToEmptyString] DOMString cellSpacing;
+};
diff --git a/dom/webidl/HTMLTableRowElement.webidl b/dom/webidl/HTMLTableRowElement.webidl
new file mode 100644
index 0000000000..b1cc297b97
--- /dev/null
+++ b/dom/webidl/HTMLTableRowElement.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLTableRowElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  readonly attribute long rowIndex;
+  readonly attribute long sectionRowIndex;
+  readonly attribute HTMLCollection cells;
+  [Throws]
+  HTMLElement insertCell(optional long index = -1);
+  [CEReactions, Throws]
+  undefined deleteCell(long index);
+};
+
+partial interface HTMLTableRowElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString ch;
+           [CEReactions, SetterThrows]
+           attribute DOMString chOff;
+           [CEReactions, SetterThrows]
+           attribute DOMString vAlign;
+
+  [CEReactions, SetterThrows]
+           attribute [LegacyNullToEmptyString] DOMString bgColor;
+};
diff --git a/dom/webidl/HTMLTableSectionElement.webidl b/dom/webidl/HTMLTableSectionElement.webidl
new file mode 100644
index 0000000000..476c908e07
--- /dev/null
+++ b/dom/webidl/HTMLTableSectionElement.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLTableSectionElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  readonly attribute HTMLCollection rows;
+  [Throws]
+  HTMLElement insertRow(optional long index = -1);
+  [CEReactions, Throws]
+  undefined deleteRow(long index);
+};
+
+partial interface HTMLTableSectionElement {
+           [CEReactions, SetterThrows]
+           attribute DOMString align;
+           [CEReactions, SetterThrows]
+           attribute DOMString ch;
+           [CEReactions, SetterThrows]
+           attribute DOMString chOff;
+           [CEReactions, SetterThrows]
+           attribute DOMString vAlign;
+};
diff --git a/dom/webidl/HTMLTemplateElement.webidl b/dom/webidl/HTMLTemplateElement.webidl
new file mode 100644
index 0000000000..f65d00b0c2
--- /dev/null
+++ b/dom/webidl/HTMLTemplateElement.webidl
@@ -0,0 +1,17 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface HTMLTemplateElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+    readonly attribute DocumentFragment content;
+};
diff --git a/dom/webidl/HTMLTextAreaElement.webidl b/dom/webidl/HTMLTextAreaElement.webidl
new file mode 100644
index 0000000000..aa625a5983
--- /dev/null
+++ b/dom/webidl/HTMLTextAreaElement.webidl
@@ -0,0 +1,94 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-textarea-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface nsIEditor;
+interface XULControllers;
+
+[Exposed=Window]
+interface HTMLTextAreaElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString autocomplete;
+  [CEReactions, SetterThrows, Pure]
+           attribute unsigned long cols;
+           // attribute DOMString dirName;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean disabled;
+  [Pure]
+  readonly attribute HTMLFormElement? form;
+           // attribute DOMString inputMode;
+  [CEReactions, SetterThrows, Pure]
+           attribute long maxLength;
+  [CEReactions, SetterThrows, Pure]
+           attribute long minLength;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString name;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString placeholder;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean readOnly;
+  [CEReactions, SetterThrows, Pure]
+           attribute boolean required;
+  [CEReactions, SetterThrows, Pure]
+           attribute unsigned long rows;
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString wrap;
+
+  [Constant]
+  readonly attribute DOMString type;
+  [CEReactions, Throws, Pure]
+           attribute DOMString defaultValue;
+  [CEReactions, SetterThrows] attribute [LegacyNullToEmptyString] DOMString value;
+  [BinaryName="getTextLength"]
+  readonly attribute unsigned long textLength;
+
+  readonly attribute boolean willValidate;
+  readonly attribute ValidityState validity;
+  [Throws]
+  readonly attribute DOMString validationMessage;
+  boolean checkValidity();
+  boolean reportValidity();
+  undefined setCustomValidity(DOMString error);
+
+  readonly attribute NodeList labels;
+
+  undefined select();
+  [Throws]
+           attribute unsigned long? selectionStart;
+  [Throws]
+           attribute unsigned long? selectionEnd;
+  [Throws]
+           attribute DOMString? selectionDirection;
+  [Throws]
+  undefined setRangeText(DOMString replacement);
+  [Throws]
+  undefined setRangeText(DOMString replacement, unsigned long start,
+    unsigned long end, optional SelectionMode selectionMode = "preserve");
+  [Throws]
+  undefined setSelectionRange(unsigned long start, unsigned long end, optional DOMString direction);
+};
+
+partial interface HTMLTextAreaElement {
+  // Chrome-only Mozilla extensions
+
+  [Throws, ChromeOnly]
+  readonly attribute XULControllers controllers;
+};
+
+HTMLTextAreaElement includes MozEditableElement;
+
+partial interface HTMLTextAreaElement {
+  [ChromeOnly]
+  attribute DOMString previewValue;
+};
diff --git a/dom/webidl/HTMLTimeElement.webidl b/dom/webidl/HTMLTimeElement.webidl
new file mode 100644
index 0000000000..3f0d8733eb
--- /dev/null
+++ b/dom/webidl/HTMLTimeElement.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level-semantics.html#the-time-element
+ */
+
+[Exposed=Window]
+interface HTMLTimeElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, SetterThrows]
+           attribute DOMString dateTime;
+};
diff --git a/dom/webidl/HTMLTitleElement.webidl b/dom/webidl/HTMLTitleElement.webidl
new file mode 100644
index 0000000000..25f4b9fbef
--- /dev/null
+++ b/dom/webidl/HTMLTitleElement.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-title-element
+ */
+
+[Exposed=Window]
+interface HTMLTitleElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+           [CEReactions, Throws]
+           attribute DOMString text;
+};
diff --git a/dom/webidl/HTMLTrackElement.webidl b/dom/webidl/HTMLTrackElement.webidl
new file mode 100644
index 0000000000..9c97e2092c
--- /dev/null
+++ b/dom/webidl/HTMLTrackElement.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-track-element
+ */
+
+[Exposed=Window]
+interface HTMLTrackElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString kind;
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString src;
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString srclang;
+  [CEReactions, SetterThrows, Pure]
+  attribute DOMString label;
+  [CEReactions, SetterThrows, Pure]
+  attribute boolean default;
+
+  const unsigned short NONE = 0;
+  const unsigned short LOADING = 1;
+  const unsigned short LOADED = 2;
+  const unsigned short ERROR = 3;
+
+  [BinaryName="readyStateForBindings"]
+  readonly attribute unsigned short readyState;
+
+  readonly attribute TextTrack? track;
+};
diff --git a/dom/webidl/HTMLUListElement.webidl b/dom/webidl/HTMLUListElement.webidl
new file mode 100644
index 0000000000..447524c48c
--- /dev/null
+++ b/dom/webidl/HTMLUListElement.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-ul-element
+ * http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-ul-element
+[Exposed=Window]
+interface HTMLUListElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+};
+
+// http://www.whatwg.org/specs/web-apps/current-work/#other-elements,-attributes-and-apis
+partial interface HTMLUListElement {
+           [CEReactions, SetterThrows]
+           attribute boolean compact;
+           [CEReactions, SetterThrows]
+           attribute DOMString type;
+};
diff --git a/dom/webidl/HTMLVideoElement.webidl b/dom/webidl/HTMLVideoElement.webidl
new file mode 100644
index 0000000000..2bc800220b
--- /dev/null
+++ b/dom/webidl/HTMLVideoElement.webidl
@@ -0,0 +1,84 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-video-element
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface HTMLVideoElement : HTMLMediaElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, SetterThrows]
+           attribute unsigned long width;
+  [CEReactions, SetterThrows]
+           attribute unsigned long height;
+  readonly attribute unsigned long videoWidth;
+  readonly attribute unsigned long videoHeight;
+  [CEReactions, SetterThrows]
+           attribute DOMString poster;
+};
+
+partial interface HTMLVideoElement {
+  // A count of the number of video frames that have demuxed from the media
+  // resource. If we were playing perfectly, we'd be able to paint this many
+  // frames.
+  readonly attribute unsigned long mozParsedFrames;
+
+  // A count of the number of frames that have been decoded. We may drop
+  // frames if the decode is taking too much time.
+  readonly attribute unsigned long mozDecodedFrames;
+
+  // A count of the number of frames that have been presented to the rendering
+  // pipeline. We may drop frames if they arrive late at the renderer.
+  readonly attribute unsigned long mozPresentedFrames;
+
+  // Number of presented frames which were painted on screen.
+  readonly attribute unsigned long mozPaintedFrames;
+
+  // Time which the last painted video frame was late by, in seconds.
+  readonly attribute double mozFrameDelay;
+
+  // True if the video has an audio track available.
+  readonly attribute boolean mozHasAudio;
+
+  // Attributes for builtin video controls to lock screen orientation.
+  // True if video controls should lock orientation when fullscreen.
+  [Pref="media.videocontrols.lock-video-orientation", Func="IsChromeOrUAWidget"]
+    readonly attribute boolean mozOrientationLockEnabled;
+  // True if screen orientation is locked by video controls.
+  [Pref="media.videocontrols.lock-video-orientation", Func="IsChromeOrUAWidget"]
+    attribute boolean mozIsOrientationLocked;
+
+  // Clones the frames playing in this <video> to the target. Cloning ends
+  // when either node is removed from their DOM trees. Throws if one or
+  // both <video> elements are not attached to a DOM tree.
+  // Returns a promise that resolves when the target's ImageContainer has been
+  // installed in this <video>'s MediaDecoder, or selected video
+  // MediaStreamTrack, whichever is available first. Note that it might never
+  // resolve.
+  [NewObject, Func="IsChromeOrUAWidget"]
+    Promise<undefined> cloneElementVisually(HTMLVideoElement target);
+
+  // Stops a <video> from cloning visually. Does nothing if the <video>
+  // wasn't cloning in the first place.
+  [Func="IsChromeOrUAWidget"]
+    undefined stopCloningElementVisually();
+
+  // Returns true if the <video> is being cloned visually to another
+  // <video> element (see cloneElementVisually).
+  [Func="IsChromeOrUAWidget"]
+    readonly attribute boolean isCloningElementVisually;
+};
+
+// https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#idl-def-HTMLVideoElement
+partial interface HTMLVideoElement {
+  [Pref="media.mediasource.enabled", NewObject]
+  VideoPlaybackQuality getVideoPlaybackQuality();
+};
diff --git a/dom/webidl/HashChangeEvent.webidl b/dom/webidl/HashChangeEvent.webidl
new file mode 100644
index 0000000000..0a99a41018
--- /dev/null
+++ b/dom/webidl/HashChangeEvent.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/#the-hashchangeevent-interface
+ */
+
+[LegacyEventInit,
+ Exposed=Window]
+interface HashChangeEvent : Event
+{
+  constructor(DOMString type, optional HashChangeEventInit eventInitDict = {});
+
+  readonly attribute DOMString oldURL;
+  readonly attribute DOMString newURL;
+
+  undefined initHashChangeEvent(DOMString typeArg,
+                                optional boolean canBubbleArg = false,
+                                optional boolean cancelableArg = false,
+                                optional DOMString oldURLArg = "",
+                                optional DOMString newURLArg = "");
+};
+
+dictionary HashChangeEventInit : EventInit
+{
+  DOMString oldURL = "";
+  DOMString newURL = "";
+};
diff --git a/dom/webidl/Headers.webidl b/dom/webidl/Headers.webidl
new file mode 100644
index 0000000000..1460dbb4ff
--- /dev/null
+++ b/dom/webidl/Headers.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://fetch.spec.whatwg.org/#headers-class
+ */
+
+typedef (sequence<sequence<ByteString>> or record<ByteString, ByteString>) HeadersInit;
+
+enum HeadersGuardEnum {
+  "none",
+  "request",
+  "request-no-cors",
+  "response",
+  "immutable"
+};
+
+[Exposed=(Window,Worker)]
+interface Headers {
+  [Throws]
+  constructor(optional HeadersInit init);
+
+  [Throws] undefined append(ByteString name, ByteString value);
+  [Throws] undefined delete(ByteString name);
+  [Throws] ByteString? get(ByteString name);
+  sequence<ByteString> getSetCookie();
+  [Throws] boolean has(ByteString name);
+  [Throws] undefined set(ByteString name, ByteString value);
+  iterable<ByteString, ByteString>;
+
+  // Used to test different guard states from mochitest.
+  // Note: Must be set prior to populating headers or will throw.
+  [ChromeOnly, SetterThrows] attribute HeadersGuardEnum guard;
+};
diff --git a/dom/webidl/Highlight.webidl b/dom/webidl/Highlight.webidl
new file mode 100644
index 0000000000..e09f0aed3f
--- /dev/null
+++ b/dom/webidl/Highlight.webidl
@@ -0,0 +1,71 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/css-highlight-api-1/
+ *
+ * Copyright © 2021 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+/**
+ * Enum defining the available highlight types.
+ * See https://drafts.csswg.org/css-highlight-api-1/#enumdef-highlighttype
+ */
+enum HighlightType {
+  "highlight",
+  "spelling-error",
+  "grammar-error"
+};
+
+/**
+ * Definition of a highlight object, consisting of a set of ranges,
+ * a priority and a highlight type.
+ *
+ * See https://drafts.csswg.org/css-highlight-api-1/#highlight
+ */
+[Pref="dom.customHighlightAPI.enabled", Exposed=Window]
+interface Highlight {
+
+  [Throws]
+  constructor(AbstractRange... initialRanges);
+  setlike<AbstractRange>;
+  attribute long priority;
+  attribute HighlightType type;
+};
+
+partial interface Highlight {
+  // Setlike methods need to be overridden.
+  // Iterating a setlike is not possible from C++ yet.
+  // Therefore a separate data structure must be held and kept in sync.
+  [Throws]
+  undefined add(AbstractRange range);
+  [Throws]
+  undefined clear();
+  [Throws]
+  boolean delete(AbstractRange range);
+};
+
+/**
+ * Registry object that contains all Highlights associated with a Document.
+ *
+ * See https://drafts.csswg.org/css-highlight-api-1/#highlightregistry
+ */
+[Pref="dom.customHighlightAPI.enabled", Exposed=Window]
+interface HighlightRegistry {
+  maplike<DOMString, Highlight>;
+};
+
+partial interface HighlightRegistry {
+  // Maplike interface methods need to be overridden.
+  // Iterating a maplike is not possible from C++ yet.
+  // Therefore, a separate data structure must be held and kept in sync.
+  [Throws]
+  undefined set(DOMString key, Highlight value);
+  [Throws]
+  undefined clear();
+  [Throws]
+  boolean delete(DOMString key);
+};
diff --git a/dom/webidl/History.webidl b/dom/webidl/History.webidl
new file mode 100644
index 0000000000..934214965d
--- /dev/null
+++ b/dom/webidl/History.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-history-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+enum ScrollRestoration { "auto", "manual" };
+
+[Exposed=Window]
+interface History {
+  [Throws]
+  readonly attribute unsigned long length;
+  [Throws]
+  attribute ScrollRestoration scrollRestoration;
+  [Throws]
+  readonly attribute any state;
+  [Throws, NeedsSubjectPrincipal]
+  undefined go(optional long delta = 0);
+  [Throws, NeedsCallerType]
+  undefined back();
+  [Throws, NeedsCallerType]
+  undefined forward();
+  [Throws, NeedsCallerType]
+  undefined pushState(any data, DOMString title, optional DOMString? url = null);
+  [Throws, NeedsCallerType]
+  undefined replaceState(any data, DOMString title, optional DOMString? url = null);
+};
diff --git a/dom/webidl/IDBCursor.webidl b/dom/webidl/IDBCursor.webidl
new file mode 100644
index 0000000000..fe69972311
--- /dev/null
+++ b/dom/webidl/IDBCursor.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IndexedDB/#cursor-interface
+ */
+
+enum IDBCursorDirection {
+    "next",
+    "nextunique",
+    "prev",
+    "prevunique"
+};
+
+[Exposed=(Window,Worker)]
+interface IDBCursor {
+    readonly    attribute (IDBObjectStore or IDBIndex) source;
+
+    [BinaryName="getDirection"]
+    readonly    attribute IDBCursorDirection           direction;
+
+    [Pure, Throws] readonly attribute any key;
+    [Pure, Throws] readonly attribute any primaryKey;
+    [SameObject] readonly attribute IDBRequest request;
+
+    [Throws]
+    undefined  advance ([EnforceRange] unsigned long count);
+
+    [Throws]
+    undefined  continue (optional any key);
+
+    [Throws]
+    undefined  continuePrimaryKey(any key, any primaryKey);
+
+    [NewObject, Throws] IDBRequest update(any value);
+    [NewObject, Throws] IDBRequest delete();
+};
+
+[Exposed=(Window,Worker)]
+interface IDBCursorWithValue : IDBCursor {
+    [Pure, Throws] readonly attribute any value;
+};
diff --git a/dom/webidl/IDBDatabase.webidl b/dom/webidl/IDBDatabase.webidl
new file mode 100644
index 0000000000..310c662c15
--- /dev/null
+++ b/dom/webidl/IDBDatabase.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IndexedDB/#database-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface IDBDatabase : EventTarget {
+    [Constant] readonly attribute DOMString name;
+    readonly    attribute unsigned long long version;
+
+    readonly    attribute DOMStringList      objectStoreNames;
+
+    [NewObject, Throws]
+    IDBTransaction transaction((DOMString or sequence<DOMString>) storeNames,
+                               optional IDBTransactionMode mode = "readonly");
+    [NewObject, Throws]
+    IDBObjectStore createObjectStore(
+        DOMString name,
+        optional IDBObjectStoreParameters options = {});
+    [Throws]
+    undefined      deleteObjectStore (DOMString name);
+    undefined      close ();
+
+                attribute EventHandler       onabort;
+                attribute EventHandler       onclose;
+                attribute EventHandler       onerror;
+                attribute EventHandler       onversionchange;
+};
diff --git a/dom/webidl/IDBFactory.webidl b/dom/webidl/IDBFactory.webidl
new file mode 100644
index 0000000000..37143bcbb5
--- /dev/null
+++ b/dom/webidl/IDBFactory.webidl
@@ -0,0 +1,64 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IndexedDB/#factory-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface Principal;
+
+dictionary IDBOpenDBOptions
+{
+  [EnforceRange] unsigned long long version;
+};
+
+/**
+ * Interface that defines the indexedDB property on a window.  See
+ * https://w3c.github.io/IndexedDB/#idbfactory
+ * for more information.
+ */
+[Exposed=(Window,Worker)]
+interface IDBFactory {
+  [NewObject, Throws, NeedsCallerType]
+  IDBOpenDBRequest
+  open(DOMString name,
+       [EnforceRange] unsigned long long version);
+
+  [NewObject, Throws, NeedsCallerType]
+  IDBOpenDBRequest
+  open(DOMString name,
+       optional IDBOpenDBOptions options = {});
+
+  [NewObject, Throws, NeedsCallerType]
+  IDBOpenDBRequest
+  deleteDatabase(DOMString name,
+                 optional IDBOpenDBOptions options = {});
+
+  [Throws]
+  short
+  cmp(any first,
+      any second);
+
+  [NewObject, Throws, ChromeOnly, NeedsCallerType]
+  IDBOpenDBRequest
+  openForPrincipal(Principal principal,
+                   DOMString name,
+                   [EnforceRange] unsigned long long version);
+
+  [NewObject, Throws, ChromeOnly, NeedsCallerType]
+  IDBOpenDBRequest
+  openForPrincipal(Principal principal,
+                   DOMString name,
+                   optional IDBOpenDBOptions options = {});
+
+  [NewObject, Throws, ChromeOnly, NeedsCallerType]
+  IDBOpenDBRequest
+  deleteForPrincipal(Principal principal,
+                     DOMString name,
+                     optional IDBOpenDBOptions options = {});
+};
diff --git a/dom/webidl/IDBIndex.webidl b/dom/webidl/IDBIndex.webidl
new file mode 100644
index 0000000000..92b9842c20
--- /dev/null
+++ b/dom/webidl/IDBIndex.webidl
@@ -0,0 +1,63 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IndexedDB/#index-interface
+ */
+
+dictionary IDBIndexParameters {
+    boolean unique = false;
+    boolean multiEntry = false;
+    // <null>:   Not locale-aware, uses normal JS sorting.
+    // <string>: Always sorted based on the rules of the specified
+    //           locale (e.g. "en-US", etc.).
+    // "auto":   Sorted by the platform default, may change based on
+    //           user agent options.
+    DOMString? locale = null;
+};
+
+[Exposed=(Window,Worker)]
+interface IDBIndex {
+    [SetterThrows] attribute DOMString name;
+    [SameObject] readonly attribute IDBObjectStore objectStore;
+
+    [Throws]
+    readonly    attribute any            keyPath;
+
+    readonly    attribute boolean        multiEntry;
+    readonly    attribute boolean        unique;
+
+    // <null>:   Not locale-aware, uses normal JS sorting.
+    // <string>: Sorted based on the rules of the specified locale.
+    //           Note: never returns "auto", only the current locale.
+    [Pref="dom.indexedDB.experimental"]
+    readonly attribute DOMString? locale;
+
+    [Pref="dom.indexedDB.experimental"]
+    readonly attribute boolean isAutoLocale;
+
+    [NewObject, Throws] IDBRequest get(any query);
+    [NewObject, Throws] IDBRequest getKey(any query);
+
+    // If we decide to add use counters for the mozGetAll/mozGetAllKeys
+    // functions, we'll need to pull them out into sepatate operations
+    // with a BinaryName mapping to the same underlying implementation.
+    // See also bug 1577227.
+    [NewObject, Throws, Alias="mozGetAll"]
+    IDBRequest getAll(optional any query,
+                      optional [EnforceRange] unsigned long count);
+    [NewObject, Throws, Alias="mozGetAllKeys"]
+    IDBRequest getAllKeys(optional any query,
+                            optional [EnforceRange] unsigned long count);
+
+    [NewObject, Throws] IDBRequest count(optional any query);
+
+    [NewObject, Throws]
+    IDBRequest openCursor(optional any query,
+                          optional IDBCursorDirection direction = "next");
+    [NewObject, Throws]
+    IDBRequest openKeyCursor(optional any query,
+                             optional IDBCursorDirection direction = "next");
+};
diff --git a/dom/webidl/IDBKeyRange.webidl b/dom/webidl/IDBKeyRange.webidl
new file mode 100644
index 0000000000..9128c52532
--- /dev/null
+++ b/dom/webidl/IDBKeyRange.webidl
@@ -0,0 +1,41 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is
+ * https://w3c.github.io/IndexedDB/#keyrange
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface IDBKeyRange {
+  [Throws]
+  readonly attribute any     lower;
+  [Throws]
+  readonly attribute any     upper;
+  [Constant]
+  readonly attribute boolean lowerOpen;
+  [Constant]
+  readonly attribute boolean upperOpen;
+  [Throws]
+  boolean _includes(any key);
+
+
+  [NewObject, Throws]
+  static IDBKeyRange only (any value);
+  [NewObject, Throws]
+  static IDBKeyRange lowerBound (any lower, optional boolean open = false);
+  [NewObject, Throws]
+  static IDBKeyRange upperBound (any upper, optional boolean open = false);
+  [NewObject, Throws]
+  static IDBKeyRange bound (any lower, any upper, optional boolean lowerOpen = false, optional boolean upperOpen = false);
+};
+
+[Exposed=(Window,Worker),
+ Pref="dom.indexedDB.experimental"]
+interface IDBLocaleAwareKeyRange : IDBKeyRange {
+  [NewObject, Throws]
+  static IDBLocaleAwareKeyRange bound (any lower, any upper, optional boolean lowerOpen = false, optional boolean upperOpen = false);
+};
diff --git a/dom/webidl/IDBObjectStore.webidl b/dom/webidl/IDBObjectStore.webidl
new file mode 100644
index 0000000000..fc19ab99e6
--- /dev/null
+++ b/dom/webidl/IDBObjectStore.webidl
@@ -0,0 +1,67 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IndexedDB/#object-store-interface
+ */
+
+dictionary IDBObjectStoreParameters {
+    (DOMString or sequence<DOMString>)? keyPath = null;
+    boolean                             autoIncrement = false;
+};
+
+[Exposed=(Window,Worker)]
+interface IDBObjectStore {
+    [SetterThrows]
+    attribute DOMString name;
+
+    [Throws]
+    readonly    attribute any            keyPath;
+
+    readonly    attribute DOMStringList  indexNames;
+    [SameObject] readonly attribute IDBTransaction transaction;
+    readonly    attribute boolean        autoIncrement;
+
+    [NewObject, Throws]
+    IDBRequest put (any value, optional any key);
+    [NewObject, Throws]
+    IDBRequest add (any value, optional any key);
+    [NewObject, Throws]
+    IDBRequest delete (any key);
+    [NewObject, Throws]
+    IDBRequest clear ();
+    [NewObject, Throws]
+    IDBRequest get (any key);
+    [NewObject, Throws]
+    IDBRequest getKey (any key);
+
+    // Success fires IDBTransactionEvent, result == array of values for given keys
+    // If we decide to add use a counter for the mozGetAll function, we'll need
+    // to pull it out into a sepatate operation with a BinaryName mapping to the
+    // same underlying implementation.
+    [NewObject, Throws, Alias="mozGetAll"]
+    IDBRequest getAll(optional any query,
+                      optional [EnforceRange] unsigned long count);
+    [NewObject, Throws]
+    IDBRequest getAllKeys(optional any query,
+                          optional [EnforceRange] unsigned long count);
+
+    [NewObject, Throws]
+    IDBRequest count(optional any key);
+
+    [NewObject, Throws]
+    IDBRequest openCursor (optional any range, optional IDBCursorDirection direction = "next");
+    [NewObject, Throws]
+    IDBRequest openKeyCursor(optional any query,
+                             optional IDBCursorDirection direction = "next");
+    [NewObject, Throws]
+    IDBIndex   createIndex (DOMString name, (DOMString or sequence<DOMString>) keyPath, optional IDBIndexParameters optionalParameters = {});
+
+    [Throws]
+    IDBIndex   index (DOMString name);
+
+    [Throws]
+    undefined       deleteIndex (DOMString indexName);
+};
diff --git a/dom/webidl/IDBOpenDBRequest.webidl b/dom/webidl/IDBOpenDBRequest.webidl
new file mode 100644
index 0000000000..16bb100d45
--- /dev/null
+++ b/dom/webidl/IDBOpenDBRequest.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IndexedDB/#idbopendbrequest
+ */
+
+[Exposed=(Window,Worker)]
+interface IDBOpenDBRequest : IDBRequest {
+                attribute EventHandler onblocked;
+
+                attribute EventHandler onupgradeneeded;
+};
diff --git a/dom/webidl/IDBRequest.webidl b/dom/webidl/IDBRequest.webidl
new file mode 100644
index 0000000000..38d3f53acc
--- /dev/null
+++ b/dom/webidl/IDBRequest.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IndexedDB/#idbrequest
+ * https://w3c.github.io/IndexedDB/#enumdef-idbrequestreadystate
+ */
+
+enum IDBRequestReadyState {
+    "pending",
+    "done"
+};
+
+[Exposed=(Window,Worker)]
+interface IDBRequest : EventTarget {
+    [Throws]
+    readonly    attribute any                  result;
+
+    [Throws]
+    readonly    attribute DOMException?        error;
+
+    readonly    attribute (IDBObjectStore or IDBIndex or IDBCursor)? source;
+    readonly    attribute IDBTransaction?      transaction;
+    readonly    attribute IDBRequestReadyState readyState;
+
+                attribute EventHandler         onsuccess;
+
+                attribute EventHandler         onerror;
+};
diff --git a/dom/webidl/IDBTransaction.webidl b/dom/webidl/IDBTransaction.webidl
new file mode 100644
index 0000000000..1bb52ff448
--- /dev/null
+++ b/dom/webidl/IDBTransaction.webidl
@@ -0,0 +1,47 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IndexedDB/#idbtransaction
+ * https://w3c.github.io/IndexedDB/#enumdef-idbtransactionmode
+ */
+
+enum IDBTransactionMode {
+    "readonly",
+    "readwrite",
+    // The "readwriteflush" mode is only available when the
+    // |dom.indexedDB.experimental| pref returns
+    // true. This mode is not yet part of the standard.
+    "readwriteflush",
+    "cleanup",
+    "versionchange"
+};
+
+[Exposed=(Window,Worker)]
+interface IDBTransaction : EventTarget {
+    [Throws]
+    readonly    attribute IDBTransactionMode mode;
+    [SameObject] readonly attribute IDBDatabase db;
+
+    readonly    attribute DOMException?      error;
+
+    [Throws]
+    IDBObjectStore objectStore (DOMString name);
+
+    [Throws]
+    undefined      commit();
+
+    [Throws]
+    undefined      abort();
+
+                attribute EventHandler       onabort;
+                attribute EventHandler       oncomplete;
+                attribute EventHandler       onerror;
+};
+
+// This seems to be custom
+partial interface IDBTransaction {
+    readonly    attribute DOMStringList objectStoreNames;
+};
diff --git a/dom/webidl/IDBVersionChangeEvent.webidl b/dom/webidl/IDBVersionChangeEvent.webidl
new file mode 100644
index 0000000000..cbb7e6fb0b
--- /dev/null
+++ b/dom/webidl/IDBVersionChangeEvent.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IndexedDB/#idbversionchangeevent
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary IDBVersionChangeEventInit : EventInit {
+    unsigned long long  oldVersion = 0;
+    unsigned long long? newVersion = null;
+};
+
+[Exposed=(Window,Worker)]
+interface IDBVersionChangeEvent : Event {
+    constructor(DOMString type,
+                optional IDBVersionChangeEventInit eventInitDict = {});
+
+    [Constant] readonly attribute unsigned long long oldVersion;
+    [Constant] readonly attribute unsigned long long? newVersion;
+};
diff --git a/dom/webidl/IIRFilterNode.webidl b/dom/webidl/IIRFilterNode.webidl
new file mode 100644
index 0000000000..0dc56f01b1
--- /dev/null
+++ b/dom/webidl/IIRFilterNode.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is https://www.w3.org/TR/webaudio
+ *
+ * Copyright © 2016 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary IIRFilterOptions : AudioNodeOptions {
+    required sequence<double> feedforward;
+    required sequence<double> feedback;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface IIRFilterNode : AudioNode {
+    [Throws]
+    constructor(BaseAudioContext context, IIRFilterOptions options);
+
+    undefined getFrequencyResponse(Float32Array frequencyHz, Float32Array magResponse, Float32Array phaseResponse);
+};
+
+// Mozilla extension
+IIRFilterNode includes AudioNodePassThrough;
diff --git a/dom/webidl/IdentityCredential.webidl b/dom/webidl/IdentityCredential.webidl
new file mode 100644
index 0000000000..0bddc5bdf7
--- /dev/null
+++ b/dom/webidl/IdentityCredential.webidl
@@ -0,0 +1,92 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://fedidcg.github.io/FedCM
+ */
+
+
+[Exposed=Window, SecureContext,
+ Pref="dom.security.credentialmanagement.identity.enabled"]
+interface IdentityCredential : Credential {
+ readonly attribute USVString? token;
+ [Throws]
+ static Promise<undefined> logoutRPs(sequence<IdentityCredentialLogoutRPsRequest> logoutRequests);
+};
+
+dictionary IdentityCredentialRequestOptions {
+ sequence<IdentityProviderConfig> providers;
+};
+
+[GenerateConversionToJS]
+dictionary IdentityProviderConfig {
+ required UTF8String configURL;
+ required USVString clientId;
+ USVString nonce;
+};
+
+// https://fedidcg.github.io/FedCM/#dictdef-identityproviderwellknown
+[GenerateInit]
+dictionary IdentityProviderWellKnown {
+  required sequence<UTF8String> provider_urls;
+};
+
+// https://fedidcg.github.io/FedCM/#dictdef-identityprovidericon
+dictionary IdentityProviderIcon {
+  required USVString url;
+  unsigned long size;
+};
+
+// https://fedidcg.github.io/FedCM/#dictdef-identityproviderbranding
+dictionary IdentityProviderBranding {
+  USVString background_color;
+  USVString color;
+  sequence<IdentityProviderIcon> icons;
+};
+
+// https://fedidcg.github.io/FedCM/#dictdef-identityproviderapiconfig
+[GenerateInit, GenerateConversionToJS]
+dictionary IdentityProviderAPIConfig {
+  required UTF8String accounts_endpoint;
+  required UTF8String client_metadata_endpoint;
+  required UTF8String id_assertion_endpoint;
+  IdentityProviderBranding branding;
+};
+
+
+// https://fedidcg.github.io/FedCM/#dictdef-identityprovideraccount
+dictionary IdentityProviderAccount {
+  required USVString id;
+  required USVString name;
+  required USVString email;
+  USVString given_name;
+  USVString picture;
+  sequence<USVString> approved_clients;
+};
+
+// https://fedidcg.github.io/FedCM/#dictdef-identityprovideraccountlist
+[GenerateInit, GenerateConversionToJS]
+dictionary IdentityProviderAccountList {
+  sequence<IdentityProviderAccount> accounts;
+};
+
+// https://fedidcg.github.io/FedCM/#dictdef-identityproviderclientmetadata
+[GenerateInit, GenerateConversionToJS]
+dictionary IdentityProviderClientMetadata {
+  USVString privacy_policy_url;
+  USVString terms_of_service_url;
+};
+
+// https://fedidcg.github.io/FedCM/#dictdef-identityprovidertoken
+[GenerateInit]
+dictionary IdentityProviderToken {
+  required USVString token;
+};
+
+// https://fedidcg.github.io/FedCM/#dictdef-identitycredentiallogoutrpsrequest
+dictionary IdentityCredentialLogoutRPsRequest {
+  required UTF8String url;
+  required UTF8String accountId;
+};
diff --git a/dom/webidl/IdleDeadline.webidl b/dom/webidl/IdleDeadline.webidl
new file mode 100644
index 0000000000..17e150102c
--- /dev/null
+++ b/dom/webidl/IdleDeadline.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * https://w3c.github.io/requestidlecallback/
+ */
+
+[Exposed=Window,
+ Func="nsGlobalWindowInner::IsRequestIdleCallbackEnabled"]
+interface IdleDeadline {
+  DOMHighResTimeStamp timeRemaining();
+  readonly attribute boolean didTimeout;
+};
diff --git a/dom/webidl/ImageBitmap.webidl b/dom/webidl/ImageBitmap.webidl
new file mode 100644
index 0000000000..1ed738a741
--- /dev/null
+++ b/dom/webidl/ImageBitmap.webidl
@@ -0,0 +1,403 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/webappapis.html#images
+ *
+ * The origin of the extended IDL file is
+ * http://w3c.github.io/mediacapture-worker/#imagebitmap-extensions
+ */
+
+typedef (CanvasImageSource or
+         Blob or
+         CanvasRenderingContext2D or // This is out of spec.
+         ImageData) ImageBitmapSource;
+
+[Exposed=(Window,Worker)]
+interface ImageBitmap {
+  [Constant]
+  readonly attribute unsigned long width;
+  [Constant]
+  readonly attribute unsigned long height;
+};
+
+// It's crucial that there be a way to explicitly dispose of ImageBitmaps
+// since they refer to potentially large graphics resources. Some uses
+// of this API proposal will result in repeated allocations of ImageBitmaps,
+// and garbage collection will not reliably reclaim them quickly enough.
+// Here we reuse close(), which also exists on another Transferable type,
+// MessagePort. Potentially, all Transferable types should inherit from a
+// new interface type "Closeable".
+partial interface ImageBitmap {
+  // Dispose of all graphical resources associated with this ImageBitmap.
+  undefined close();
+};
+
+// ImageBitmap-extensions
+// Bug 1141979 - [FoxEye] Extend ImageBitmap with interfaces to access its
+// underlying image data
+
+/*
+ * An image or a video frame is conceptually a two-dimensional array of data and
+ * each element in the array is called a pixel. The pixels are usually stored in
+ * a one-dimensional array and could be arranged in a variety of image formats.
+ * Developers need to know how the pixels are formatted so that they are able to
+ * process them.
+ *
+ * The image format describes how pixels in an image are arranged. A single
+ * pixel has at least one, but usually multiple pixel values. The range of a
+ * pixel value varies, which means different image formats use different data
+ * types to store a single pixel value.
+ *
+ * The most frequently used data type is 8-bit unsigned integer whose range is
+ * from 0 to 255, others could be 16-bit integer or 32-bit floating points and
+ * so forth. The number of pixel values of a single pixel is called the number
+ * of channels of the image format. Multiple pixel values of a pixel are used
+ * together to describe the captured property which could be color or depth
+ * information. For example, if the data is a color image in RGB color space,
+ * then it is a three-channel image format and a pixel is described by R, G and
+ * B three pixel values with range from 0 to 255. As another example, if the
+ * data is a gray image, then it is a single-channel image format with 8-bit
+ * unsigned integer data type and the pixel value describes the gray scale. For
+ * depth data, it is a single channel image format too, but the data type is
+ * 16-bit unsigned integer and the pixel value is the depth level.
+ *
+ * For those image formats whose pixels contain multiple pixel values, the pixel
+ * values might be arranged in one of the following ways:
+ * 1) Planar pixel layout:
+ *    each channel has its pixel values stored consecutively in separated
+ *    buffers (a.k.a. planes) and then all channel buffers are stored
+ *    consecutively in memory.
+ *    (Ex: RRRRRR......GGGGGG......BBBBBB......)
+ * 2) Interleaving pixel layout:
+ *    each pixel has its pixel values from all channels stored together and
+ *    interleaves all channels.
+ *    (Ex: RGBRGBRGBRGBRGB......)
+ */
+
+
+/*
+ * The ImageBitmap extensions use this enumeration to negotiate the image format
+ * while 1) accessing the underlying data of an ImageBitmap and
+ *       2) creating a new ImageBitmap.
+ *
+ * For each format in this enumeration, we use a 2x2 small image (4 pixels) as
+ * example to illustrate the pixel layout.
+ *
+ * 2x2 image:   +--------+--------+
+ *              | pixel1 | pixel2 |
+ *              +--------+--------+
+ *              | pixel3 | pixel4 |
+ *              +--------+--------+
+ *
+ */
+enum ImageBitmapFormat {
+  /*
+   * Channel order: R, G, B, A
+   * Channel size: full rgba-chennels
+   * Pixel layout: interleaving rgba-channels
+   * Pixel layout illustration:
+   *   [Plane1]: R1 G1 B1 A1 R2 G2 B2 A2 R3 G3 B3 A3 R4 G4 B4 A4
+   * Data type: 8-bit unsigned integer
+   */
+  "RGBA32",
+
+  /*
+   * Channel order: B, G, R, A
+   * Channel size: full bgra-channels
+   * Pixel layout: interleaving bgra-channels
+   * Pixel layout illustration:
+   *   [Plane1]: B1 G1 R1 A1 B2 G2 R2 A2 B3 G3 R3 A3 B4 G4 R4 A4
+   * Data type: 8-bit unsigned integer
+   */
+  "BGRA32",
+
+  /*
+   * Channel order: R, G, B
+   * Channel size: full rgb-channels
+   * Pixel layout: interleaving rgb-channels
+   * Pixel layout illustration:
+   *   [Plane1]: R1 G1 B1 R2 G2 B2 R3 G3 B3 R4 G4 B4
+   * Data type: 8-bit unsigned integer
+   */
+  "RGB24",
+
+  /*
+   * Channel order: B, G, R
+   * Channel size: full bgr-channels
+   * Pixel layout: interleaving bgr-channels
+   * Pixel layout illustration:
+   *   [Plane1]: B1 G1 R1 B2 G2 R2 B3 G3 R3 B4 G4 R4
+   * Data type: 8-bit unsigned integer
+   */
+  "BGR24",
+
+  /*
+   * Channel order: GRAY
+   * Channel size: full gray-channel
+   * Pixel layout: planar gray-channel
+   * Pixel layout illustration:
+   *   [Plane1]: GRAY1 GRAY2 GRAY3 GRAY4
+   * Data type: 8-bit unsigned integer
+   */
+  "GRAY8",
+
+  /*
+   * Channel order: Y, U, V
+   * Channel size: full yuv-channels
+   * Pixel layout: planar yuv-channels
+   * Pixel layout illustration:
+   *   [Plane1]: Y1 Y2 Y3 Y4
+   *   [Plane2]: U1 U2 U3 U4
+   *   [Plane3]: V1 V2 V3 V4
+   * Data type: 8-bit unsigned integer
+   */
+  "YUV444P",
+
+  /*
+   * Channel order: Y, U, V
+   * Channel size: full y-channel, half uv-channels
+   * Pixel layout: planar yuv-channels
+   * Pixel layout illustration:
+   *   [Plane1]: Y1 Y2 Y3 Y4
+   *   [Plane2]: U1 U3
+   *   [Plane3]: V1 V3
+   * Data type: 8-bit unsigned integer
+   */
+  "YUV422P",
+
+  /*
+   * Channel order: Y, U, V
+   * Channel size: full y-channel, quarter uv-channels
+   * Pixel layout: planar yuv-channels
+   * Pixel layout illustration:
+   *   [Plane1]: Y1 Y2 Y3 Y4
+   *   [Plane2]: U1
+   *   [Plane3]: V1
+   * Data type: 8-bit unsigned integer
+   */
+  "YUV420P",
+
+  /*
+   * Channel order: Y, U, V
+   * Channel size: full y-channel, quarter uv-channels
+   * Pixel layout: planar y-channel, interleaving uv-channels
+   * Pixel layout illustration:
+   *   [Plane1]: Y1 Y2 Y3 Y4
+   *   [Plane2]: U1 V1
+   * Data type: 8-bit unsigned integer
+   */
+  "YUV420SP_NV12",
+
+  /*
+   * Channel order: Y, V, U
+   * Channel size: full y-channel, quarter vu-channels
+   * Pixel layout: planar y-channel, interleaving vu-channels
+   * Pixel layout illustration:
+   *   [Plane1]: Y1 Y2 Y3 Y4
+   *   [Plane2]: V1 U1
+   * Data type: 8-bit unsigned integer
+   */
+  "YUV420SP_NV21",
+
+  /*
+   * Channel order: H, S, V
+   * Channel size: full hsv-channels
+   * Pixel layout: interleaving hsv-channels
+   * Pixel layout illustration:
+   *   [Plane1]: H1 S1 V1 H2 S2 V2 H3 S3 V3
+   * Data type: 32-bit floating point value
+   */
+  "HSV",
+
+  /*
+   * Channel order: l, a, b
+   * Channel size: full lab-channels
+   * Pixel layout: interleaving lab-channels
+   * Pixel layout illustration:
+   *   [Plane1]: l1 a1 b1 l2 a2 b2 l3 a3 b3
+   * Data type: 32-bit floating point value
+   */
+  "Lab",
+
+  /*
+   * Channel order: DEPTH
+   * Channel size: full depth-channel
+   * Pixel layout: planar depth-channel
+   * Pixel layout illustration:
+   *   [Plane1]: DEPTH1 DEPTH2 DEPTH3 DEPTH4
+   * Data type: 16-bit unsigned integer
+   */
+  "DEPTH",
+};
+
+enum ChannelPixelLayoutDataType {
+  "uint8",
+  "int8",
+  "uint16",
+  "int16",
+  "uint32",
+  "int32",
+  "float32",
+  "float64"
+};
+
+/*
+ * Two concepts, ImagePixelLayout and ChannelPixelLayout, together generalize
+ * the variety of pixel layouts among image formats.
+ *
+ * The ChannelPixelLayout represents the pixel layout of a single channel in a
+ * certain image format and the ImagePixelLayout is just the collection of
+ * ChannelPixelLayouts. So, the ChannelPixelLayout is defined as a dictionary
+ * type with properties to describe the layout and the ImagePixelLayout is just
+ * an alias name to a sequence of ChannelPixelLayout objects.
+ *
+ * Since an image format is composed of at least one channel, an
+ * ImagePixelLayout object contains at least one ChannelPixelLayout object.
+ *
+ * Although an image or a video frame is a two-dimensional structure, its data
+ * is usually stored in a one-dimensional array in the row-major way and the
+ * ChannelPixelLayout objects use the following properties to describe the
+ * layout of pixel values in the buffer.
+ *
+ * 1) offset:
+ *    denotes the beginning position of the channel's data relative to the
+ *    beginning position of the one-dimensional array.
+ * 2) width & height:
+ *    denote the width and height of the channel respectively. Each channel in
+ *    an image format may have different height and width.
+ * 3) data type:
+ *    denotes the format used to store one single pixel value.
+ * 4) stride:
+ *    the number of bytes between the beginning two consecutive rows in memory.
+ *    (The total bytes of each row plus the padding bytes of each raw.)
+ * 5) skip value:
+ *    the value is zero for the planar pixel layout, and a positive integer for
+ *    the interleaving pixel layout. (Describes how many bytes there are between
+ *    two adjacent pixel values in this channel.)
+ */
+
+/*
+ * Example1: RGBA image, width = 620, height = 480, stride = 2560
+ *
+ * chanel_r: offset = 0, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ * chanel_g: offset = 1, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ * chanel_b: offset = 2, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ * chanel_a: offset = 3, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ *
+ *         <---------------------------- stride ---------------------------->
+ *         <---------------------- width x 4 ---------------------->
+ * [index] 01234   8   12  16  20  24  28                           2479    2559
+ *         |||||---|---|---|---|---|---|----------------------------|-------|
+ * [data]  RGBARGBARGBARGBARGBAR___R___R...                         A%%%%%%%%
+ * [data]  RGBARGBARGBARGBARGBAR___R___R...                         A%%%%%%%%
+ * [data]  RGBARGBARGBARGBARGBAR___R___R...                         A%%%%%%%%
+ *              ^^^
+ *              r-skip
+ */
+
+/*
+ * Example2: YUV420P image, width = 620, height = 480, stride = 640
+ *
+ * chanel_y: offset = 0, width = 620, height = 480, stride = 640, skip = 0
+ * chanel_u: offset = 307200, width = 310, height = 240, data type = uint8, stride = 320, skip = 0
+ * chanel_v: offset = 384000, width = 310, height = 240, data type = uint8, stride = 320, skip = 0
+ *
+ *         <--------------------------- y-stride --------------------------->
+ *         <----------------------- y-width ----------------------->
+ * [index] 012345                                                  619      639
+ *         ||||||--------------------------------------------------|--------|
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                        Y%%%%%%%%%
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                        Y%%%%%%%%%
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                        Y%%%%%%%%%
+ * [data]  ......
+ *         <-------- u-stride ---------->
+ *         <----- u-width ----->
+ * [index] 307200              307509   307519
+ *         |-------------------|--------|
+ * [data]  UUUUUUUUUU...       U%%%%%%%%%
+ * [data]  UUUUUUUUUU...       U%%%%%%%%%
+ * [data]  UUUUUUUUUU...       U%%%%%%%%%
+ * [data]  ......
+ *         <-------- v-stride ---------->
+ *         <- --- v-width ----->
+ * [index] 384000              384309   384319
+ *         |-------------------|--------|
+ * [data]  VVVVVVVVVV...       V%%%%%%%%%
+ * [data]  VVVVVVVVVV...       V%%%%%%%%%
+ * [data]  VVVVVVVVVV...       V%%%%%%%%%
+ * [data]  ......
+ */
+
+/*
+ * Example3: YUV420SP_NV12 image, width = 620, height = 480, stride = 640
+ *
+ * chanel_y: offset = 0, width = 620, height = 480, stride = 640, skip = 0
+ * chanel_u: offset = 307200, width = 310, height = 240, data type = uint8, stride = 640, skip = 1
+ * chanel_v: offset = 307201, width = 310, height = 240, data type = uint8, stride = 640, skip = 1
+ *
+ *         <--------------------------- y-stride -------------------------->
+ *         <----------------------- y-width ---------------------->
+ * [index] 012345                                                 619      639
+ *         ||||||-------------------------------------------------|--------|
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                       Y%%%%%%%%%
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                       Y%%%%%%%%%
+ * [data]  YYYYYYYYYYYYYYYYYYYYYYYYYYYYY...                       Y%%%%%%%%%
+ * [data]  ......
+ *         <--------------------- u-stride / v-stride -------------------->
+ *         <------------------ u-width + v-width ----------------->
+ * [index] 307200(u-offset)                                       307819  307839
+ *         |------------------------------------------------------|-------|
+ * [index] |307201(v-offset)                                      |307820 |
+ *         ||-----------------------------------------------------||------|
+ * [data]  UVUVUVUVUVUVUVUVUVUVUVUVUVUVUV...                      UV%%%%%%%
+ * [data]  UVUVUVUVUVUVUVUVUVUVUVUVUVUVUV...                      UV%%%%%%%
+ * [data]  UVUVUVUVUVUVUVUVUVUVUVUVUVUVUV...                      UV%%%%%%%
+ *          ^            ^
+ *         u-skip        v-skip
+ */
+
+/*
+ * Example4: DEPTH image, width = 640, height = 480, stride = 1280
+ *
+ * chanel_d: offset = 0, width = 640, height = 480, data type = uint16, stride = 1280, skip = 0
+ *
+ * note: each DEPTH value uses two bytes
+ *
+ *         <----------------------- d-stride ---------------------->
+ *         <----------------------- d-width ----------------------->
+ * [index] 02468                                                   1278
+ *         |||||---------------------------------------------------|
+ * [data]  DDDDDDDDDDDDDDDDDDDDDDDDDDDDD...                        D
+ * [data]  DDDDDDDDDDDDDDDDDDDDDDDDDDDDD...                        D
+ * [data]  DDDDDDDDDDDDDDDDDDDDDDDDDDDDD...                        D
+ * [data]  ......
+ */
+
+dictionary ChannelPixelLayout {
+    required unsigned long              offset;
+    required unsigned long              width;
+    required unsigned long              height;
+    required ChannelPixelLayoutDataType dataType;
+    required unsigned long              stride;
+    required unsigned long              skip;
+};
+
+typedef sequence<ChannelPixelLayout> ImagePixelLayout;
+
+enum ImageOrientation { "none", "flipY", "from-image" };
+enum PremultiplyAlpha { "none", "premultiply", "default" };
+enum ColorSpaceConversion { "none", "default" };
+//enum ResizeQuality { "pixelated", "low", "medium", "high" };
+
+dictionary ImageBitmapOptions {
+  ImageOrientation imageOrientation = "none";
+  PremultiplyAlpha premultiplyAlpha = "default";
+  // options to be added  bugs: 1363861
+  ColorSpaceConversion colorSpaceConversion = "default";
+  [EnforceRange] unsigned long resizeWidth;
+  [EnforceRange] unsigned long resizeHeight;
+  //ResizeQuality resizeQuality = "low";
+};
diff --git a/dom/webidl/ImageBitmapRenderingContext.webidl b/dom/webidl/ImageBitmapRenderingContext.webidl
new file mode 100644
index 0000000000..83027c2826
--- /dev/null
+++ b/dom/webidl/ImageBitmapRenderingContext.webidl
@@ -0,0 +1,43 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://wiki.whatwg.org/wiki/OffscreenCanvas
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+// The new ImageBitmapRenderingContext is a canvas rendering context
+// which only provides the functionality to replace the canvas's
+// contents with the given ImageBitmap. Its context id (the first argument
+// to getContext) is "bitmaprenderer".
+[Exposed=(Window,Worker)]
+interface ImageBitmapRenderingContext {
+  readonly attribute CanvasSource? canvas;
+
+  // Displays the given ImageBitmap in the canvas associated with this
+  // rendering context. Ownership of the ImageBitmap is transferred to
+  // the canvas. The caller may not use its reference to the ImageBitmap
+  // after making this call. (This semantic is crucial to enable prompt
+  // reclamation of expensive graphics resources, rather than relying on
+  // garbage collection to do so.)
+  //
+  // The ImageBitmap conceptually replaces the canvas's bitmap, but
+  // it does not change the canvas's intrinsic width or height.
+  //
+  // The ImageBitmap, when displayed, is clipped to the rectangle
+  // defined by the canvas's instrinsic width and height. Pixels that
+  // would be covered by the canvas's bitmap which are not covered by
+  // the supplied ImageBitmap are rendered transparent black. Any CSS
+  // styles affecting the display of the canvas are applied as usual.
+  [Throws]
+  undefined transferFromImageBitmap(ImageBitmap? bitmap);
+
+  // Deprecated version of transferFromImageBitmap
+  [Deprecated="ImageBitmapRenderingContext_TransferImageBitmap", Throws]
+  undefined transferImageBitmap(ImageBitmap bitmap);
+};
diff --git a/dom/webidl/ImageCapture.webidl b/dom/webidl/ImageCapture.webidl
new file mode 100644
index 0000000000..559a7dbfec
--- /dev/null
+++ b/dom/webidl/ImageCapture.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/dap/raw-file/default/media-stream-capture/ImageCapture.html
+ *
+ * Copyright © 2012-2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.imagecapture.enabled",
+ Exposed=Window]
+interface ImageCapture : EventTarget {
+  [Throws]
+  constructor(MediaStreamTrack track);
+
+  // readonly attribute PhotoSettingsOptions photoSettingsOptions;
+  [BinaryName="GetVideoStreamTrack"]
+  readonly attribute MediaStreamTrack videoStreamTrack;
+  attribute EventHandler onphoto;
+  attribute EventHandler onerror;
+  // attribute EventHandler onphotosettingschange;
+  // attribute EventHandler onframegrab;
+
+  // [Throws]
+  // undefined setOptions (PhotoSettings? photoSettings);
+  [Throws]
+  undefined takePhoto();
+  // [Throws]
+  // undefined getFrame();
+};
diff --git a/dom/webidl/ImageCaptureErrorEvent.webidl b/dom/webidl/ImageCaptureErrorEvent.webidl
new file mode 100644
index 0000000000..486154b861
--- /dev/null
+++ b/dom/webidl/ImageCaptureErrorEvent.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/dap/raw-file/default/media-stream-capture/ImageCapture.html
+ *
+ * Copyright © 2012-2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.imagecapture.enabled",
+ Exposed=Window]
+interface ImageCaptureErrorEvent : Event {
+  constructor(DOMString type,
+              optional ImageCaptureErrorEventInit imageCaptureErrorInitDict = {});
+
+  readonly attribute ImageCaptureError? imageCaptureError;
+};
+
+dictionary ImageCaptureErrorEventInit : EventInit {
+  ImageCaptureError? imageCaptureError = null;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface ImageCaptureError {
+  const unsigned short FRAME_GRAB_ERROR = 1;
+  const unsigned short SETTINGS_ERROR = 2;
+  const unsigned short PHOTO_ERROR = 3;
+  const unsigned short ERROR_UNKNOWN = 4;
+  readonly attribute unsigned short code;
+  readonly attribute DOMString message;
+};
diff --git a/dom/webidl/ImageData.webidl b/dom/webidl/ImageData.webidl
new file mode 100644
index 0000000000..8e5c882860
--- /dev/null
+++ b/dom/webidl/ImageData.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#imagedata
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of this document.
+ */
+
+[Exposed=(Window,Worker),
+ Serializable]
+interface ImageData {
+ [Throws]
+ constructor(unsigned long sw, unsigned long sh);
+ [Throws]
+ constructor(Uint8ClampedArray data, unsigned long sw,
+             optional unsigned long sh);
+
+ [Constant]
+ readonly attribute unsigned long width;
+ [Constant]
+ readonly attribute unsigned long height;
+ [Constant, StoreInSlot]
+ readonly attribute Uint8ClampedArray data;
+};
diff --git a/dom/webidl/ImageDocument.webidl b/dom/webidl/ImageDocument.webidl
new file mode 100644
index 0000000000..e81af7da7b
--- /dev/null
+++ b/dom/webidl/ImageDocument.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly, LegacyOverrideBuiltIns,
+ Exposed=Window]
+interface ImageDocument : HTMLDocument {
+  /* Whether the image is overflowing visible area. */
+  readonly attribute boolean imageIsOverflowing;
+
+  /* Whether the image has been resized to fit visible area. */
+  readonly attribute boolean imageIsResized;
+
+  /* Resize the image to fit visible area. */
+  undefined shrinkToFit();
+
+  /* Restore image original size. */
+  undefined restoreImage();
+};
diff --git a/dom/webidl/InputEvent.webidl b/dom/webidl/InputEvent.webidl
new file mode 100644
index 0000000000..c2e027219f
--- /dev/null
+++ b/dom/webidl/InputEvent.webidl
@@ -0,0 +1,53 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/input-events/#interface-InputEvent
+ */
+
+[Exposed=Window]
+interface InputEvent : UIEvent
+{
+  constructor(DOMString type, optional InputEventInit eventInitDict = {});
+
+  readonly attribute boolean       isComposing;
+
+  readonly attribute DOMString inputType;
+
+  [NeedsCallerType]
+  readonly attribute DOMString? data;
+};
+
+dictionary InputEventInit : UIEventInit
+{
+  boolean isComposing = false;
+  DOMString inputType = "";
+  // NOTE:  Currently, default value of `data` attribute is declared as empty
+  //        string by UI Events.  However, both Chrome and Safari uses `null`,
+  //        and there is a spec issue about this:
+  //        https://github.com/w3c/uievents/issues/139
+  //        So, we take `null` for compatibility with them.
+  DOMString? data = null;
+};
+
+// https://w3c.github.io/input-events/#interface-InputEvent
+// https://rawgit.com/w3c/input-events/v1/index.html#interface-InputEvent
+partial interface InputEvent
+{
+  [NeedsCallerType]
+  readonly attribute DataTransfer? dataTransfer;
+  // Enable `getTargetRanges()` only when `beforeinput` event is enabled
+  // because this may be used for feature detection of `beforeinput` event
+  // support (due to Chrome not supporting `onbeforeinput` attribute).
+  [Pref="dom.input_events.beforeinput.enabled"]
+  sequence<StaticRange> getTargetRanges();
+};
+
+partial dictionary InputEventInit
+{
+  DataTransfer? dataTransfer = null;
+  [Pref="dom.input_events.beforeinput.enabled"]
+  sequence<StaticRange> targetRanges = [];
+};
diff --git a/dom/webidl/InstallTrigger.webidl b/dom/webidl/InstallTrigger.webidl
new file mode 100644
index 0000000000..01fcb3a446
--- /dev/null
+++ b/dom/webidl/InstallTrigger.webidl
@@ -0,0 +1,94 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+
+/**
+ * A callback function that webpages can implement to be notified when triggered
+ * installs complete.
+ */
+callback InstallTriggerCallback = undefined(DOMString url, short status);
+
+dictionary InstallTriggerData {
+  DOMString URL;
+  DOMString? IconURL;
+  DOMString? Hash;
+};
+
+/**
+ * The interface for the InstallTrigger object available to all websites.
+ */
+[ChromeOnly,
+ JSImplementation="@mozilla.org/addons/installtrigger;1",
+ Exposed=Window]
+interface InstallTriggerImpl {
+  /**
+   * Retained for backwards compatibility.
+   */
+  const unsigned short SKIN = 1;
+  const unsigned short LOCALE = 2;
+  const unsigned short CONTENT = 4;
+  const unsigned short PACKAGE = 7;
+
+  /**
+   * Tests if installation is enabled.
+   */
+  boolean enabled();
+
+  /**
+   * Tests if installation is enabled.
+   *
+   * @deprecated Use "enabled" in the future.
+   */
+  boolean updateEnabled();
+
+  /**
+   * Starts a new installation of a set of add-ons.
+   *
+   * @param  aArgs
+   *         The add-ons to install. This should be a JS object, each property
+   *         is the name of an add-on to be installed. The value of the
+   *         property should either be a string URL, or an object with the
+   *         following properties:
+   *          * URL for the add-on's URL
+   *          * IconURL for an icon for the add-on
+   *          * Hash for a hash of the add-on
+   * @param  aCallback
+   *         A callback to call as each installation succeeds or fails
+   * @return true if the installations were successfully started
+   */
+  [Deprecated="InstallTriggerInstallDeprecated"]
+  boolean install(record<DOMString, (DOMString or InstallTriggerData)> installs,
+                  optional InstallTriggerCallback callback);
+
+  /**
+   * Starts installing a new add-on.
+   *
+   * @deprecated use "install" in the future.
+   *
+   * @param  aType
+   *         Unused, retained for backwards compatibility
+   * @param  aUrl
+   *         The URL of the add-on
+   * @param  aSkin
+   *         Unused, retained for backwards compatibility
+   * @return true if the installation was successfully started
+   */
+  [Deprecated="InstallTriggerInstallDeprecated"]
+  boolean installChrome(unsigned short type, DOMString url, DOMString skin);
+
+  /**
+   * Starts installing a new add-on.
+   *
+   * @deprecated use "install" in the future.
+   *
+   * @param  aUrl
+   *         The URL of the add-on
+   * @param  aFlags
+   *         Unused, retained for backwards compatibility
+   * @return true if the installation was successfully started
+   */
+  [Deprecated="InstallTriggerInstallDeprecated"]
+  boolean startSoftwareUpdate(DOMString url, optional unsigned short flags);
+};
diff --git a/dom/webidl/IntersectionObserver.webidl b/dom/webidl/IntersectionObserver.webidl
new file mode 100644
index 0000000000..f28240df7d
--- /dev/null
+++ b/dom/webidl/IntersectionObserver.webidl
@@ -0,0 +1,61 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IntersectionObserver/
+ */
+
+[ProbablyShortLivingWrapper, Exposed=Window]
+interface IntersectionObserverEntry {
+  [Constant]
+  readonly attribute DOMHighResTimeStamp time;
+  [Constant]
+  readonly attribute DOMRectReadOnly? rootBounds;
+  [Constant]
+  readonly attribute DOMRectReadOnly boundingClientRect;
+  [Constant]
+  readonly attribute DOMRectReadOnly intersectionRect;
+  [Constant]
+  readonly attribute boolean isIntersecting;
+  [Constant]
+  readonly attribute double intersectionRatio;
+  [Constant]
+  readonly attribute Element target;
+};
+
+[Exposed=Window]
+interface IntersectionObserver {
+  [Throws]
+  constructor(IntersectionCallback intersectionCallback,
+              optional IntersectionObserverInit options = {});
+
+  [Constant]
+  readonly attribute Node? root;
+  [Constant]
+  readonly attribute UTF8String rootMargin;
+  [Constant,Cached]
+  readonly attribute sequence<double> thresholds;
+  undefined observe(Element target);
+  undefined unobserve(Element target);
+  undefined disconnect();
+  sequence<IntersectionObserverEntry> takeRecords();
+};
+
+callback IntersectionCallback =
+  undefined (sequence<IntersectionObserverEntry> entries, IntersectionObserver observer);
+
+dictionary IntersectionObserverEntryInit {
+  required DOMHighResTimeStamp time;
+  required DOMRectInit rootBounds;
+  required DOMRectInit boundingClientRect;
+  required DOMRectInit intersectionRect;
+  required Element target;
+};
+
+dictionary IntersectionObserverInit {
+  (Element or Document)? root = null;
+  UTF8String rootMargin = "0px";
+  (double or sequence<double>) threshold = 0;
+};
diff --git a/dom/webidl/IntlUtils.webidl b/dom/webidl/IntlUtils.webidl
new file mode 100644
index 0000000000..1efa35c728
--- /dev/null
+++ b/dom/webidl/IntlUtils.webidl
@@ -0,0 +1,83 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[GenerateConversionToJS]
+dictionary DisplayNameOptions {
+  DOMString type;
+  DOMString style;
+  DOMString calendar;
+  sequence<DOMString> keys;
+};
+
+[GenerateInit]
+dictionary DisplayNameResult {
+  DOMString locale;
+  DOMString type;
+  DOMString style;
+  DOMString calendar;
+  sequence<DOMString> values;
+};
+
+[GenerateInit]
+dictionary LocaleInfo {
+  DOMString locale;
+  DOMString direction;
+};
+
+/**
+ * The IntlUtils interface provides helper functions for localization.
+ */
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface IntlUtils {
+  /**
+   * Helper function to retrieve the localized values for a list of requested
+   * keys.
+   *
+   * The function takes two arguments - locales which is a list of locale
+   * strings and options which is an object with four optional properties:
+   *
+   *   keys:
+   *     an Array of string values to localize
+   *
+   *   type:
+   *     a String with a value "language", "region", "script", "currency",
+   *     "weekday", "month", "quarter", "dayPeriod", or "dateTimeField"
+   *
+   *   style:
+   *     a String with a value "long", "abbreviated", "short", or "narrow"
+   *
+   *   calendar:
+   *     a String to select a specific calendar type, e.g. "gregory"
+   *
+   * It returns an object with properties:
+   *
+   *   locale:
+   *     a negotiated locale string
+   *
+   *   type:
+   *     negotiated type
+   *
+   *   style:
+   *     negotiated style
+   *
+   *   calendar:
+   *     negotiated calendar
+   *
+   *   values:
+   *     a list of translated values for the requested keys
+   *
+   */
+  [Throws]
+  DisplayNameResult getDisplayNames(sequence<DOMString> locales,
+                                    optional DisplayNameOptions options = {});
+
+  /**
+   * Helper function to determine if the current application locale is RTL.
+   *
+   * The result of this function can be overriden by this pref:
+   *  - `intl.l10n.pseudo`
+   */
+  boolean isAppLocaleRTL();
+};
diff --git a/dom/webidl/IterableIterator.webidl b/dom/webidl/IterableIterator.webidl
new file mode 100644
index 0000000000..378b7f12a9
--- /dev/null
+++ b/dom/webidl/IterableIterator.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[GenerateConversionToJS]
+dictionary IterableKeyOrValueResult {
+  any value;
+  boolean done = false;
+};
+
+[GenerateConversionToJS]
+dictionary IterableKeyAndValueResult {
+  sequence<any> value = [];
+  boolean done = false;
+};
diff --git a/dom/webidl/KeyAlgorithm.webidl b/dom/webidl/KeyAlgorithm.webidl
new file mode 100644
index 0000000000..b1f3d79935
--- /dev/null
+++ b/dom/webidl/KeyAlgorithm.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/WebCryptoAPI/
+ */
+
+dictionary KeyAlgorithm {
+  required DOMString name;
+};
+
+[GenerateConversionToJS]
+dictionary AesKeyAlgorithm : KeyAlgorithm {
+  required unsigned short length;
+};
+
+[GenerateConversionToJS]
+dictionary EcKeyAlgorithm : KeyAlgorithm {
+  required DOMString namedCurve;
+};
+
+[GenerateConversionToJS]
+dictionary HmacKeyAlgorithm : KeyAlgorithm {
+  required KeyAlgorithm hash;
+  required unsigned long length;
+};
+
+[GenerateConversionToJS]
+dictionary RsaHashedKeyAlgorithm : KeyAlgorithm {
+  required unsigned short modulusLength;
+  required Uint8Array publicExponent;
+  required KeyAlgorithm hash;
+};
+
+[GenerateConversionToJS]
+dictionary DhKeyAlgorithm : KeyAlgorithm {
+  required Uint8Array prime;
+  required Uint8Array generator;
+};
diff --git a/dom/webidl/KeyEvent.webidl b/dom/webidl/KeyEvent.webidl
new file mode 100644
index 0000000000..16c417c9e3
--- /dev/null
+++ b/dom/webidl/KeyEvent.webidl
@@ -0,0 +1,250 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// http://www.w3.org/TR/1999/WD-DOM-Level-2-19990923/events.html#Events-KeyEvent
+[Exposed=Window]
+interface KeyEvent
+{
+  // It's all mixed in.
+};
+KeyEvent includes KeyEventMixin;
+
+interface mixin KeyEventMixin {
+  const unsigned long DOM_VK_CANCEL         = 0x03;
+  const unsigned long DOM_VK_HELP           = 0x06;
+  const unsigned long DOM_VK_BACK_SPACE     = 0x08;
+  const unsigned long DOM_VK_TAB            = 0x09;
+  const unsigned long DOM_VK_CLEAR          = 0x0C;
+  const unsigned long DOM_VK_RETURN         = 0x0D;
+  // DOM_VK_ENTER has been never used for representing native key events.
+  // Therefore, it's removed for preventing developers being confused.
+  // const unsigned long DOM_VK_ENTER          = 0x0E;
+  const unsigned long DOM_VK_SHIFT          = 0x10;
+  const unsigned long DOM_VK_CONTROL        = 0x11;
+  const unsigned long DOM_VK_ALT            = 0x12;
+  const unsigned long DOM_VK_PAUSE          = 0x13;
+  const unsigned long DOM_VK_CAPS_LOCK      = 0x14;
+  const unsigned long DOM_VK_KANA           = 0x15;
+  const unsigned long DOM_VK_HANGUL         = 0x15;
+  const unsigned long DOM_VK_EISU           = 0x16; // Japanese Mac keyboard only
+  const unsigned long DOM_VK_JUNJA          = 0x17;
+  const unsigned long DOM_VK_FINAL          = 0x18;
+  const unsigned long DOM_VK_HANJA          = 0x19;
+  const unsigned long DOM_VK_KANJI          = 0x19;
+  const unsigned long DOM_VK_ESCAPE         = 0x1B;
+  const unsigned long DOM_VK_CONVERT        = 0x1C;
+  const unsigned long DOM_VK_NONCONVERT     = 0x1D;
+  const unsigned long DOM_VK_ACCEPT         = 0x1E;
+  const unsigned long DOM_VK_MODECHANGE     = 0x1F;
+  const unsigned long DOM_VK_SPACE          = 0x20;
+  const unsigned long DOM_VK_PAGE_UP        = 0x21;
+  const unsigned long DOM_VK_PAGE_DOWN      = 0x22;
+  const unsigned long DOM_VK_END            = 0x23;
+  const unsigned long DOM_VK_HOME           = 0x24;
+  const unsigned long DOM_VK_LEFT           = 0x25;
+  const unsigned long DOM_VK_UP             = 0x26;
+  const unsigned long DOM_VK_RIGHT          = 0x27;
+  const unsigned long DOM_VK_DOWN           = 0x28;
+  const unsigned long DOM_VK_SELECT         = 0x29;
+  const unsigned long DOM_VK_PRINT          = 0x2A;
+  const unsigned long DOM_VK_EXECUTE        = 0x2B;
+  const unsigned long DOM_VK_PRINTSCREEN    = 0x2C;
+  const unsigned long DOM_VK_INSERT         = 0x2D;
+  const unsigned long DOM_VK_DELETE         = 0x2E;
+
+  // DOM_VK_0 - DOM_VK_9 match their ascii values
+  const unsigned long DOM_VK_0              = 0x30;
+  const unsigned long DOM_VK_1              = 0x31;
+  const unsigned long DOM_VK_2              = 0x32;
+  const unsigned long DOM_VK_3              = 0x33;
+  const unsigned long DOM_VK_4              = 0x34;
+  const unsigned long DOM_VK_5              = 0x35;
+  const unsigned long DOM_VK_6              = 0x36;
+  const unsigned long DOM_VK_7              = 0x37;
+  const unsigned long DOM_VK_8              = 0x38;
+  const unsigned long DOM_VK_9              = 0x39;
+
+  const unsigned long DOM_VK_COLON          = 0x3A;
+  const unsigned long DOM_VK_SEMICOLON      = 0x3B;
+  const unsigned long DOM_VK_LESS_THAN      = 0x3C;
+  const unsigned long DOM_VK_EQUALS         = 0x3D;
+  const unsigned long DOM_VK_GREATER_THAN   = 0x3E;
+  const unsigned long DOM_VK_QUESTION_MARK  = 0x3F;
+  const unsigned long DOM_VK_AT             = 0x40;
+
+  // DOM_VK_A - DOM_VK_Z match their ascii values
+  const unsigned long DOM_VK_A              = 0x41;
+  const unsigned long DOM_VK_B              = 0x42;
+  const unsigned long DOM_VK_C              = 0x43;
+  const unsigned long DOM_VK_D              = 0x44;
+  const unsigned long DOM_VK_E              = 0x45;
+  const unsigned long DOM_VK_F              = 0x46;
+  const unsigned long DOM_VK_G              = 0x47;
+  const unsigned long DOM_VK_H              = 0x48;
+  const unsigned long DOM_VK_I              = 0x49;
+  const unsigned long DOM_VK_J              = 0x4A;
+  const unsigned long DOM_VK_K              = 0x4B;
+  const unsigned long DOM_VK_L              = 0x4C;
+  const unsigned long DOM_VK_M              = 0x4D;
+  const unsigned long DOM_VK_N              = 0x4E;
+  const unsigned long DOM_VK_O              = 0x4F;
+  const unsigned long DOM_VK_P              = 0x50;
+  const unsigned long DOM_VK_Q              = 0x51;
+  const unsigned long DOM_VK_R              = 0x52;
+  const unsigned long DOM_VK_S              = 0x53;
+  const unsigned long DOM_VK_T              = 0x54;
+  const unsigned long DOM_VK_U              = 0x55;
+  const unsigned long DOM_VK_V              = 0x56;
+  const unsigned long DOM_VK_W              = 0x57;
+  const unsigned long DOM_VK_X              = 0x58;
+  const unsigned long DOM_VK_Y              = 0x59;
+  const unsigned long DOM_VK_Z              = 0x5A;
+
+  const unsigned long DOM_VK_WIN            = 0x5B;
+  const unsigned long DOM_VK_CONTEXT_MENU   = 0x5D;
+  const unsigned long DOM_VK_SLEEP          = 0x5F;
+
+  // Numpad keys
+  const unsigned long DOM_VK_NUMPAD0        = 0x60;
+  const unsigned long DOM_VK_NUMPAD1        = 0x61;
+  const unsigned long DOM_VK_NUMPAD2        = 0x62;
+  const unsigned long DOM_VK_NUMPAD3        = 0x63;
+  const unsigned long DOM_VK_NUMPAD4        = 0x64;
+  const unsigned long DOM_VK_NUMPAD5        = 0x65;
+  const unsigned long DOM_VK_NUMPAD6        = 0x66;
+  const unsigned long DOM_VK_NUMPAD7        = 0x67;
+  const unsigned long DOM_VK_NUMPAD8        = 0x68;
+  const unsigned long DOM_VK_NUMPAD9        = 0x69;
+  const unsigned long DOM_VK_MULTIPLY       = 0x6A;
+  const unsigned long DOM_VK_ADD            = 0x6B;
+  const unsigned long DOM_VK_SEPARATOR      = 0x6C;
+  const unsigned long DOM_VK_SUBTRACT       = 0x6D;
+  const unsigned long DOM_VK_DECIMAL        = 0x6E;
+  const unsigned long DOM_VK_DIVIDE         = 0x6F;
+
+  const unsigned long DOM_VK_F1             = 0x70;
+  const unsigned long DOM_VK_F2             = 0x71;
+  const unsigned long DOM_VK_F3             = 0x72;
+  const unsigned long DOM_VK_F4             = 0x73;
+  const unsigned long DOM_VK_F5             = 0x74;
+  const unsigned long DOM_VK_F6             = 0x75;
+  const unsigned long DOM_VK_F7             = 0x76;
+  const unsigned long DOM_VK_F8             = 0x77;
+  const unsigned long DOM_VK_F9             = 0x78;
+  const unsigned long DOM_VK_F10            = 0x79;
+  const unsigned long DOM_VK_F11            = 0x7A;
+  const unsigned long DOM_VK_F12            = 0x7B;
+  const unsigned long DOM_VK_F13            = 0x7C;
+  const unsigned long DOM_VK_F14            = 0x7D;
+  const unsigned long DOM_VK_F15            = 0x7E;
+  const unsigned long DOM_VK_F16            = 0x7F;
+  const unsigned long DOM_VK_F17            = 0x80;
+  const unsigned long DOM_VK_F18            = 0x81;
+  const unsigned long DOM_VK_F19            = 0x82;
+  const unsigned long DOM_VK_F20            = 0x83;
+  const unsigned long DOM_VK_F21            = 0x84;
+  const unsigned long DOM_VK_F22            = 0x85;
+  const unsigned long DOM_VK_F23            = 0x86;
+  const unsigned long DOM_VK_F24            = 0x87;
+
+  const unsigned long DOM_VK_NUM_LOCK       = 0x90;
+  const unsigned long DOM_VK_SCROLL_LOCK    = 0x91;
+
+  // OEM specific virtual keyCode of Windows should pass through DOM keyCode
+  // for compatibility with the other web browsers on Windows.
+  const unsigned long DOM_VK_WIN_OEM_FJ_JISHO   = 0x92;
+  const unsigned long DOM_VK_WIN_OEM_FJ_MASSHOU = 0x93;
+  const unsigned long DOM_VK_WIN_OEM_FJ_TOUROKU = 0x94;
+  const unsigned long DOM_VK_WIN_OEM_FJ_LOYA    = 0x95;
+  const unsigned long DOM_VK_WIN_OEM_FJ_ROYA    = 0x96;
+
+  const unsigned long DOM_VK_CIRCUMFLEX     = 0xA0;
+  const unsigned long DOM_VK_EXCLAMATION    = 0xA1;
+  const unsigned long DOM_VK_DOUBLE_QUOTE   = 0xA2;
+  const unsigned long DOM_VK_HASH           = 0xA3;
+  const unsigned long DOM_VK_DOLLAR         = 0xA4;
+  const unsigned long DOM_VK_PERCENT        = 0xA5;
+  const unsigned long DOM_VK_AMPERSAND      = 0xA6;
+  const unsigned long DOM_VK_UNDERSCORE     = 0xA7;
+  const unsigned long DOM_VK_OPEN_PAREN     = 0xA8;
+  const unsigned long DOM_VK_CLOSE_PAREN    = 0xA9;
+  const unsigned long DOM_VK_ASTERISK       = 0xAA;
+  const unsigned long DOM_VK_PLUS           = 0xAB;
+  const unsigned long DOM_VK_PIPE           = 0xAC;
+  const unsigned long DOM_VK_HYPHEN_MINUS   = 0xAD;
+
+  const unsigned long DOM_VK_OPEN_CURLY_BRACKET  = 0xAE;
+  const unsigned long DOM_VK_CLOSE_CURLY_BRACKET = 0xAF;
+
+  const unsigned long DOM_VK_TILDE          = 0xB0;
+
+  const unsigned long DOM_VK_VOLUME_MUTE    = 0xB5;
+  const unsigned long DOM_VK_VOLUME_DOWN    = 0xB6;
+  const unsigned long DOM_VK_VOLUME_UP      = 0xB7;
+
+  const unsigned long DOM_VK_COMMA          = 0xBC;
+  const unsigned long DOM_VK_PERIOD         = 0xBE;
+  const unsigned long DOM_VK_SLASH          = 0xBF;
+  const unsigned long DOM_VK_BACK_QUOTE     = 0xC0;
+  const unsigned long DOM_VK_OPEN_BRACKET   = 0xDB; // square bracket
+  const unsigned long DOM_VK_BACK_SLASH     = 0xDC;
+  const unsigned long DOM_VK_CLOSE_BRACKET  = 0xDD; // square bracket
+  const unsigned long DOM_VK_QUOTE          = 0xDE; // Apostrophe
+
+  const unsigned long DOM_VK_META           = 0xE0;
+  const unsigned long DOM_VK_ALTGR          = 0xE1;
+
+  // OEM specific virtual keyCode of Windows should pass through DOM keyCode
+  // for compatibility with the other web browsers on Windows.
+  const unsigned long DOM_VK_WIN_ICO_HELP    = 0xE3;
+  const unsigned long DOM_VK_WIN_ICO_00      = 0xE4;
+
+  // IME processed key.
+  const unsigned long DOM_VK_PROCESSKEY      = 0xE5;
+
+  // OEM specific virtual keyCode of Windows should pass through DOM keyCode
+  // for compatibility with the other web browsers on Windows.
+  const unsigned long DOM_VK_WIN_ICO_CLEAR   = 0xE6;
+  const unsigned long DOM_VK_WIN_OEM_RESET   = 0xE9;
+  const unsigned long DOM_VK_WIN_OEM_JUMP    = 0xEA;
+  const unsigned long DOM_VK_WIN_OEM_PA1     = 0xEB;
+  const unsigned long DOM_VK_WIN_OEM_PA2     = 0xEC;
+  const unsigned long DOM_VK_WIN_OEM_PA3     = 0xED;
+  const unsigned long DOM_VK_WIN_OEM_WSCTRL  = 0xEE;
+  const unsigned long DOM_VK_WIN_OEM_CUSEL   = 0xEF;
+  const unsigned long DOM_VK_WIN_OEM_ATTN    = 0xF0;
+  const unsigned long DOM_VK_WIN_OEM_FINISH  = 0xF1;
+  const unsigned long DOM_VK_WIN_OEM_COPY    = 0xF2;
+  const unsigned long DOM_VK_WIN_OEM_AUTO    = 0xF3;
+  const unsigned long DOM_VK_WIN_OEM_ENLW    = 0xF4;
+  const unsigned long DOM_VK_WIN_OEM_BACKTAB = 0xF5;
+
+  // Following keys are not used on most keyboards.  However, for compatibility
+  // with other browsers on Windows, we should define them.
+  const unsigned long DOM_VK_ATTN           = 0xF6;
+  const unsigned long DOM_VK_CRSEL          = 0xF7;
+  const unsigned long DOM_VK_EXSEL          = 0xF8;
+  const unsigned long DOM_VK_EREOF          = 0xF9;
+  const unsigned long DOM_VK_PLAY           = 0xFA;
+  const unsigned long DOM_VK_ZOOM           = 0xFB;
+  const unsigned long DOM_VK_PA1            = 0xFD;
+
+  // OEM specific virtual keyCode of Windows should pass through DOM keyCode
+  // for compatibility with the other web browsers on Windows.
+  const unsigned long DOM_VK_WIN_OEM_CLEAR  = 0xFE;
+
+  [BinaryName="initKeyEventJS", Func="KeyboardEvent::IsInitKeyEventAvailable"]
+  undefined initKeyEvent(DOMString type,
+                         optional boolean canBubble = false,
+                         optional boolean cancelable = false,
+                         optional Window? view = null,
+                         optional boolean ctrlKey = false,
+                         optional boolean altKey = false,
+                         optional boolean shiftKey = false,
+                         optional boolean metaKey = false,
+                         optional unsigned long keyCode = 0,
+                         optional unsigned long charCode = 0);
+};
diff --git a/dom/webidl/KeyIdsInitData.webidl b/dom/webidl/KeyIdsInitData.webidl
new file mode 100644
index 0000000000..95f975dd45
--- /dev/null
+++ b/dom/webidl/KeyIdsInitData.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// "KeyIds" EME init data format definition/parser, as defined by
+// https://w3c.github.io/encrypted-media/format-registry/initdata/keyids.html
+[GenerateInitFromJSON]
+dictionary KeyIdsInitData {
+  required sequence<DOMString> kids;
+};
diff --git a/dom/webidl/KeyboardEvent.webidl b/dom/webidl/KeyboardEvent.webidl
new file mode 100644
index 0000000000..dde358c191
--- /dev/null
+++ b/dom/webidl/KeyboardEvent.webidl
@@ -0,0 +1,76 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface KeyboardEvent : UIEvent
+{
+  [BinaryName="constructorJS"]
+  constructor(DOMString typeArg,
+              optional KeyboardEventInit keyboardEventInitDict= {});
+
+  [NeedsCallerType]
+  readonly attribute unsigned long    charCode;
+  [NeedsCallerType]
+  readonly attribute unsigned long    keyCode;
+
+  [NeedsCallerType]
+  readonly attribute boolean          altKey;
+  [NeedsCallerType]
+  readonly attribute boolean          ctrlKey;
+  [NeedsCallerType]
+  readonly attribute boolean          shiftKey;
+  readonly attribute boolean          metaKey;
+
+  [NeedsCallerType]
+  boolean getModifierState(DOMString key);
+
+  const unsigned long DOM_KEY_LOCATION_STANDARD = 0x00;
+  const unsigned long DOM_KEY_LOCATION_LEFT     = 0x01;
+  const unsigned long DOM_KEY_LOCATION_RIGHT    = 0x02;
+  const unsigned long DOM_KEY_LOCATION_NUMPAD   = 0x03;
+
+  readonly attribute unsigned long location;
+  readonly attribute boolean       repeat;
+  readonly attribute boolean       isComposing;
+
+  readonly attribute DOMString key;
+  [NeedsCallerType]
+  readonly attribute DOMString code;
+
+  [BinaryName="initKeyboardEventJS"]
+  undefined initKeyboardEvent(DOMString typeArg,
+                              optional boolean bubblesArg = false,
+                              optional boolean cancelableArg = false,
+                              optional Window? viewArg = null,
+                              optional DOMString keyArg = "",
+                              optional unsigned long locationArg = 0,
+                              optional boolean ctrlKey = false,
+                              optional boolean altKey = false,
+                              optional boolean shiftKey = false,
+                              optional boolean metaKey = false);
+
+  // This returns the initialized dictionary for generating a
+  // same-type keyboard event
+  [Cached, ChromeOnly, Constant]
+  readonly attribute KeyboardEventInit initDict;
+};
+
+dictionary KeyboardEventInit : EventModifierInit
+{
+  DOMString      key           = "";
+  DOMString      code          = "";
+  unsigned long  location      = 0;
+  boolean        repeat        = false;
+  boolean        isComposing   = false;
+
+  // legacy attributes
+  unsigned long  charCode      = 0;
+  unsigned long  keyCode       = 0;
+  unsigned long  which         = 0;
+};
+
+// Mozilla extensions
+KeyboardEvent includes KeyEventMixin;
diff --git a/dom/webidl/KeyframeAnimationOptions.webidl b/dom/webidl/KeyframeAnimationOptions.webidl
new file mode 100644
index 0000000000..047f46ed1a
--- /dev/null
+++ b/dom/webidl/KeyframeAnimationOptions.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/fxtf/web-animations/#the-animatable-interface
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// This typedef is off in its own file, because of bug 995352.
+typedef (unrestricted double or KeyframeAnimationOptions) UnrestrictedDoubleOrKeyframeAnimationOptions;
diff --git a/dom/webidl/KeyframeEffect.webidl b/dom/webidl/KeyframeEffect.webidl
new file mode 100644
index 0000000000..752983b5a3
--- /dev/null
+++ b/dom/webidl/KeyframeEffect.webidl
@@ -0,0 +1,66 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/web-animations/#the-keyframeeffect-interfaces
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum IterationCompositeOperation {
+  "replace",
+  "accumulate"
+};
+
+dictionary KeyframeEffectOptions : EffectTiming {
+  [Pref="dom.animations-api.compositing.enabled"]
+  IterationCompositeOperation iterationComposite = "replace";
+  [Pref="dom.animations-api.compositing.enabled"]
+  CompositeOperation          composite = "replace";
+  DOMString?                  pseudoElement = null;
+};
+
+// KeyframeEffect should run in the caller's compartment to do custom
+// processing on the `keyframes` object.
+[Func="Document::IsWebAnimationsEnabled",
+ RunConstructorInCallerCompartment,
+ Exposed=Window]
+interface KeyframeEffect : AnimationEffect {
+  [Throws]
+  constructor(Element? target,
+              object? keyframes,
+              optional (unrestricted double or KeyframeEffectOptions) options = {});
+  [Throws]
+  constructor(KeyframeEffect source);
+
+  attribute Element?                  target;
+  [SetterThrows] attribute DOMString? pseudoElement;
+  [Pref="dom.animations-api.compositing.enabled"]
+  attribute IterationCompositeOperation     iterationComposite;
+  [Pref="dom.animations-api.compositing.enabled"]
+  attribute CompositeOperation              composite;
+  [Throws] sequence<object> getKeyframes();
+  [Throws] undefined        setKeyframes(object? keyframes);
+};
+
+// Non-standard extensions
+dictionary AnimationPropertyValueDetails {
+  required double             offset;
+           UTF8String         value;
+           UTF8String         easing;
+  required CompositeOperation composite;
+};
+
+dictionary AnimationPropertyDetails {
+  required DOMString                               property;
+  required boolean                                 runningOnCompositor;
+           DOMString                               warning;
+  required sequence<AnimationPropertyValueDetails> values;
+};
+
+partial interface KeyframeEffect {
+  [ChromeOnly, Throws] sequence<AnimationPropertyDetails> getProperties();
+};
diff --git a/dom/webidl/LinkStyle.webidl b/dom/webidl/LinkStyle.webidl
new file mode 100644
index 0000000000..9559f2e958
--- /dev/null
+++ b/dom/webidl/LinkStyle.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom/#the-linkstyle-interface
+ */
+
+interface mixin LinkStyle {
+  [BinaryName="sheetForBindings"] readonly attribute StyleSheet? sheet;
+};
diff --git a/dom/webidl/LoadURIOptions.webidl b/dom/webidl/LoadURIOptions.webidl
new file mode 100644
index 0000000000..fe11a1cc8f
--- /dev/null
+++ b/dom/webidl/LoadURIOptions.webidl
@@ -0,0 +1,102 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface ContentSecurityPolicy;
+interface Principal;
+interface URI;
+interface InputStream;
+interface ReferrerInfo;
+
+/**
+ * This dictionary holds load arguments for docshell loads.
+ */
+[GenerateInit]
+dictionary LoadURIOptions {
+  /**
+   * The principal that initiated the load.
+   */
+  Principal? triggeringPrincipal = null;
+
+  /**
+   * The CSP to be used for the load. That is *not* the CSP that will
+   * be applied to subresource loads within that document but the CSP
+   * for the document load itself. E.g. if that CSP includes
+   * upgrade-insecure-requests, then the new top-level load will
+   * be upgraded to HTTPS.
+   */
+  ContentSecurityPolicy? csp = null;
+
+  /**
+   * Flags modifying load behaviour.  This parameter is a bitwise
+   * combination of the load flags defined in nsIWebNavigation.idl.
+   */
+   long loadFlags = 0;
+
+  /**
+   * The referring info of the load.  If this argument is null, then the
+   * referrer URI and referrer policy will be inferred internally.
+   */
+   ReferrerInfo? referrerInfo = null;
+
+  /**
+   * If the URI to be loaded corresponds to a HTTP request, then this stream is
+   * appended directly to the HTTP request headers.  It may be prefixed
+   * with additional HTTP headers.  This stream must contain a "\r\n"
+   * sequence separating any HTTP headers from the HTTP request body.
+   */
+  InputStream? postData = null;
+
+  /**
+   * If the URI corresponds to a HTTP request, then any HTTP headers
+   * contained in this stream are set on the HTTP request.  The HTTP
+   * header stream is formatted as:
+   *     ( HEADER "\r\n" )*
+   */
+   InputStream? headers = null;
+
+  /**
+   * Set to indicate a base URI to be associated with the load. Note
+   * that at present this argument is only used with view-source aURIs
+   * and cannot be used to resolve aURI.
+   */
+  URI? baseURI = null;
+
+  /**
+   * Set to indicate that the URI to be loaded was triggered by a user
+   * action. (Mostly used in the context of Sec-Fetch-User).
+   */
+  boolean hasValidUserGestureActivation = false;
+
+
+  /**
+  * The SandboxFlags of the entity thats
+  * responsible for causing the load.
+  */
+  unsigned long triggeringSandboxFlags = 0;
+
+  /**
+   * The RemoteType of the entity that's responsible for the load. Defaults to
+   * the current process.
+   *
+   * When starting a load in a content process, `triggeringRemoteType` must be
+   * either unset, or match the current remote type.
+   */
+  UTF8String? triggeringRemoteType;
+
+  /**
+   * If non-0, a value to pass to nsIDocShell::setCancelContentJSEpoch
+   * when initiating the load.
+   */
+  long cancelContentJSEpoch = 0;
+
+  /**
+   * If this is passed, it will control which remote type is used to finish this
+   * load. Ignored for non-`about:` loads.
+   *
+   * NOTE: This is _NOT_ defaulted to `null`, as `null` is the value for
+   * `NOT_REMOTE_TYPE`, and we need to determine the difference between no
+   * `remoteTypeOverride` and a `remoteTypeOverride` of `NOT_REMOTE_TYPE`.
+   */
+  UTF8String? remoteTypeOverride;
+};
diff --git a/dom/webidl/Localization.webidl b/dom/webidl/Localization.webidl
new file mode 100644
index 0000000000..8eceec433b
--- /dev/null
+++ b/dom/webidl/Localization.webidl
@@ -0,0 +1,158 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * L10nIdArgs is an object used to carry localization tuple for message
+ * translation.
+ *
+ * Fields:
+ *    id - identifier of a message.
+ *  args - an optional record of arguments used to format the message.
+ *         The argument will be converted to/from JSON, and the API
+ *         will only handle strings and numbers.
+ */
+dictionary L10nIdArgs {
+  UTF8String? id = null;
+  L10nArgs? args = null;
+};
+
+/**
+ * When no arguments are required to format a message a simple string can be
+ * used instead.
+ */
+typedef (UTF8String or L10nIdArgs) L10nKey;
+
+/**
+ * L10nMessage is a compound translation unit from Fluent which
+ * encodes the value and (optionally) a list of attributes used
+ * to translate a given widget.
+ *
+ * Most simple imperative translations will only use the `value`,
+ * but when building a Message for a UI widget, a combination
+ * of a value and attributes will be used.
+ */
+dictionary AttributeNameValue {
+  required UTF8String name;
+  required UTF8String value;
+};
+
+dictionary L10nMessage {
+  UTF8String? value = null;
+  sequence<AttributeNameValue>? attributes = null;
+};
+
+/**
+ * Localization is an implementation of the Fluent Localization API.
+ *
+ * An instance of a Localization class stores a state of a mix
+ * of localization resources and provides the API to resolve
+ * translation value for localization identifiers from the
+ * resources.
+ *
+ * Methods:
+ *    - addResourceIds     - add resources
+ *    - removeResourceIds  - remove resources
+ *    - formatValue        - format a single value
+ *    - formatValues       - format multiple values
+ *    - formatMessages     - format multiple compound messages
+ *
+ */
+[Func="IsChromeOrUAWidget", Exposed=Window]
+interface Localization {
+  /**
+   * Constructor arguments:
+   *    - aResourceids         - a list of localization resource URIs
+   *                             which will provide messages for this
+   *                             Localization instance.
+   *    - aSync                - Specifies if the initial state of the Localization API is synchronous.
+   *                             This enables a number of synchronous methods on the
+   *                             Localization API.
+   *    - aRegistry            - optional custom L10nRegistry to be used by this Localization instance.
+   *    - aLocales             - custom set of locales to be used for this Localization.
+   */
+  [Throws]
+  constructor(sequence<L10nResourceId> aResourceIds,
+              optional boolean aSync = false,
+              optional L10nRegistry aRegistry,
+              optional sequence<UTF8String> aLocales);
+
+  /**
+   * A method for adding resources to the localization context.
+   */
+  undefined addResourceIds(sequence<L10nResourceId> aResourceIds);
+
+  /**
+   * A method for removing resources from the localization context.
+   *
+   * Returns a new count of resources used by the context.
+   */
+  unsigned long removeResourceIds(sequence<L10nResourceId> aResourceIds);
+
+  /**
+   * Formats a value of a localization message with a given id.
+   * An optional dictionary of arguments can be passed to inform
+   * the message formatting logic.
+   *
+   * Example:
+   *    let value = await document.l10n.formatValue("unread-emails", {count: 5});
+   *    assert.equal(value, "You have 5 unread emails");
+   */
+  [NewObject] Promise<UTF8String?> formatValue(UTF8String aId, optional L10nArgs aArgs);
+
+  /**
+   * Formats values of a list of messages with given ids.
+   *
+   * Example:
+   *    let values = await document.l10n.formatValues([
+   *      {id: "hello-world"},
+   *      {id: "unread-emails", args: {count: 5}
+   *    ]);
+   *    assert.deepEqual(values, [
+   *      "Hello World",
+   *      "You have 5 unread emails"
+   *    ]);
+   */
+  [NewObject] Promise<sequence<UTF8String?>> formatValues(sequence<L10nKey> aKeys);
+
+  /**
+   * Formats values and attributes of a list of messages with given ids.
+   *
+   * Example:
+   *    let values = await document.l10n.formatMessages([
+   *      {id: "hello-world"},
+   *      {id: "unread-emails", args: {count: 5}
+   *    ]);
+   *    assert.deepEqual(values, [
+   *      {
+   *        value: "Hello World",
+   *        attributes: null
+   *      },
+   *      {
+   *        value: "You have 5 unread emails",
+   *        attributes: {
+   *          tooltip: "Click to select them all"
+   *        }
+   *      }
+   *    ]);
+   */
+  [NewObject] Promise<sequence<L10nMessage?>> formatMessages(sequence<L10nKey> aKeys);
+
+  undefined setAsync();
+
+  [NewObject, Throws]
+  UTF8String? formatValueSync(UTF8String aId, optional L10nArgs aArgs);
+  [NewObject, Throws]
+  sequence<UTF8String?> formatValuesSync(sequence<L10nKey> aKeys);
+  [NewObject, Throws]
+  sequence<L10nMessage?> formatMessagesSync(sequence<L10nKey> aKeys);
+};
+
+/**
+ * A helper dict for converting between JS Value and L10nArgs.
+ */
+[GenerateInitFromJSON, GenerateConversionToJS]
+dictionary L10nArgsHelperDict {
+  required L10nArgs args;
+};
diff --git a/dom/webidl/Location.webidl b/dom/webidl/Location.webidl
new file mode 100644
index 0000000000..5ee62c72fe
--- /dev/null
+++ b/dom/webidl/Location.webidl
@@ -0,0 +1,47 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/history.html#the-location-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[LegacyUnforgeable,
+ Exposed=Window]
+interface Location {
+  [Throws, CrossOriginWritable, NeedsSubjectPrincipal]
+  stringifier attribute USVString href;
+  [Throws, NeedsSubjectPrincipal]
+  readonly attribute USVString origin;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString protocol;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString host;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString hostname;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString port;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString pathname;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString search;
+  [Throws, NeedsSubjectPrincipal]
+           attribute USVString hash;
+
+  [Throws, NeedsSubjectPrincipal]
+  undefined assign(USVString url);
+
+  [Throws, CrossOriginCallable, NeedsSubjectPrincipal]
+  undefined replace(USVString url);
+
+  // XXXbz there is no forceget argument in the spec!  See bug 1037721.
+  [Throws, NeedsSubjectPrincipal]
+  undefined reload(optional boolean forceget = false);
+
+  // Bug 1085214 [SameObject] readonly attribute USVString[] ancestorOrigins;
+};
diff --git a/dom/webidl/Lock.webidl b/dom/webidl/Lock.webidl
new file mode 100644
index 0000000000..bed5dc59a2
--- /dev/null
+++ b/dom/webidl/Lock.webidl
@@ -0,0 +1,5 @@
+[SecureContext, Exposed=(Window,Worker), Pref="dom.weblocks.enabled"]
+interface Lock {
+  readonly attribute DOMString name;
+  readonly attribute LockMode mode;
+};
diff --git a/dom/webidl/LockManager.webidl b/dom/webidl/LockManager.webidl
new file mode 100644
index 0000000000..88102c1d59
--- /dev/null
+++ b/dom/webidl/LockManager.webidl
@@ -0,0 +1,35 @@
+[SecureContext, Exposed=(Window,Worker), Pref="dom.weblocks.enabled"]
+interface LockManager {
+  [NewObject]
+  Promise<any> request(DOMString name,
+                       LockGrantedCallback callback);
+  [NewObject]
+  Promise<any> request(DOMString name,
+                       LockOptions options,
+                       LockGrantedCallback callback);
+
+  [NewObject]
+  Promise<LockManagerSnapshot> query();
+};
+
+callback LockGrantedCallback = Promise<any> (Lock? lock);
+
+enum LockMode { "shared", "exclusive" };
+
+dictionary LockOptions {
+  LockMode mode = "exclusive";
+  boolean ifAvailable = false;
+  boolean steal = false;
+  AbortSignal signal;
+};
+
+dictionary LockManagerSnapshot {
+  sequence<LockInfo> held;
+  sequence<LockInfo> pending;
+};
+
+dictionary LockInfo {
+  DOMString name;
+  LockMode mode;
+  DOMString clientId;
+};
diff --git a/dom/webidl/MIDIAccess.webidl b/dom/webidl/MIDIAccess.webidl
new file mode 100644
index 0000000000..4c7ca24920
--- /dev/null
+++ b/dom/webidl/MIDIAccess.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext, Pref="dom.webmidi.enabled",
+ Exposed=Window]
+interface MIDIAccess : EventTarget {
+  readonly attribute MIDIInputMap  inputs;
+  readonly attribute MIDIOutputMap outputs;
+           attribute EventHandler  onstatechange;
+  readonly attribute boolean       sysexEnabled;
+};
diff --git a/dom/webidl/MIDIConnectionEvent.webidl b/dom/webidl/MIDIConnectionEvent.webidl
new file mode 100644
index 0000000000..bb4b7adc22
--- /dev/null
+++ b/dom/webidl/MIDIConnectionEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext,
+ Pref="dom.webmidi.enabled",
+ Exposed=Window]
+interface MIDIConnectionEvent : Event
+{
+  constructor(DOMString type,
+              optional MIDIConnectionEventInit eventInitDict = {});
+
+  readonly attribute MIDIPort? port;
+};
+
+dictionary MIDIConnectionEventInit : EventInit
+{
+  MIDIPort? port = null;
+};
diff --git a/dom/webidl/MIDIInput.webidl b/dom/webidl/MIDIInput.webidl
new file mode 100644
index 0000000000..61b6cc2748
--- /dev/null
+++ b/dom/webidl/MIDIInput.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext, Pref="dom.webmidi.enabled",
+ Exposed=Window]
+interface MIDIInput : MIDIPort {
+  attribute EventHandler onmidimessage;
+};
diff --git a/dom/webidl/MIDIInputMap.webidl b/dom/webidl/MIDIInputMap.webidl
new file mode 100644
index 0000000000..e3c3b0d5aa
--- /dev/null
+++ b/dom/webidl/MIDIInputMap.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext, Pref="dom.webmidi.enabled",
+ Exposed=Window]
+interface MIDIInputMap {
+  readonly maplike<DOMString, MIDIInput>;
+};
diff --git a/dom/webidl/MIDIMessageEvent.webidl b/dom/webidl/MIDIMessageEvent.webidl
new file mode 100644
index 0000000000..975ddae4c4
--- /dev/null
+++ b/dom/webidl/MIDIMessageEvent.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext,
+ Pref="dom.webmidi.enabled",
+ Exposed=Window]
+interface MIDIMessageEvent : Event
+{
+  [Throws]
+  constructor(DOMString type, optional MIDIMessageEventInit eventInitDict = {});
+
+  [Throws]
+  readonly attribute Uint8Array  data;
+};
+
+dictionary MIDIMessageEventInit : EventInit
+{
+  Uint8Array  data;
+};
diff --git a/dom/webidl/MIDIOptions.webidl b/dom/webidl/MIDIOptions.webidl
new file mode 100644
index 0000000000..314ebec535
--- /dev/null
+++ b/dom/webidl/MIDIOptions.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+dictionary MIDIOptions {
+  boolean sysex = false;
+  boolean software = false;
+};
diff --git a/dom/webidl/MIDIOutput.webidl b/dom/webidl/MIDIOutput.webidl
new file mode 100644
index 0000000000..73c0a5bdb2
--- /dev/null
+++ b/dom/webidl/MIDIOutput.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext, Pref="dom.webmidi.enabled",
+ Exposed=Window]
+interface MIDIOutput : MIDIPort {
+  [Throws]
+  undefined send(sequence<octet> data, optional DOMHighResTimeStamp timestamp);
+  undefined clear();
+};
diff --git a/dom/webidl/MIDIOutputMap.webidl b/dom/webidl/MIDIOutputMap.webidl
new file mode 100644
index 0000000000..9070c55193
--- /dev/null
+++ b/dom/webidl/MIDIOutputMap.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+[SecureContext, Pref="dom.webmidi.enabled",
+ Exposed=Window]
+interface MIDIOutputMap {
+  readonly maplike<DOMString, MIDIOutput>;
+};
diff --git a/dom/webidl/MIDIPort.webidl b/dom/webidl/MIDIPort.webidl
new file mode 100644
index 0000000000..97ee46bf00
--- /dev/null
+++ b/dom/webidl/MIDIPort.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-midi-api/
+ */
+
+enum MIDIPortType {
+  "input",
+  "output"
+};
+
+enum MIDIPortDeviceState {
+  "disconnected",
+  "connected"
+};
+
+enum MIDIPortConnectionState {
+  "open",
+  "closed",
+  "pending"
+};
+
+[SecureContext, Pref="dom.webmidi.enabled",
+ Exposed=Window]
+interface MIDIPort : EventTarget {
+  readonly attribute DOMString    id;
+  readonly attribute DOMString?   manufacturer;
+  readonly attribute DOMString?   name;
+  readonly attribute DOMString?   version;
+  readonly attribute MIDIPortType type;
+  readonly attribute MIDIPortDeviceState state;
+  readonly attribute MIDIPortConnectionState connection;
+           attribute EventHandler onstatechange;
+  [Throws]
+  Promise<MIDIPort> open();
+  [Throws]
+  Promise<MIDIPort> close();
+};
diff --git a/dom/webidl/MathMLElement.webidl b/dom/webidl/MathMLElement.webidl
new file mode 100644
index 0000000000..0283adfddc
--- /dev/null
+++ b/dom/webidl/MathMLElement.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://mathml-refresh.github.io/mathml-core/
+ *
+ * Copyright © 2019 W3C® (MIT, ERCIM, Keio, Beihang). W3C liability, trademark
+ * and permissive document license rules apply.
+ */
+
+[Exposed=Window]
+interface MathMLElement : Element { };
+MathMLElement includes GlobalEventHandlers;
+MathMLElement includes HTMLOrForeignElement;
+MathMLElement includes ElementCSSInlineStyle;
+MathMLElement includes TouchEventHandlers;
+MathMLElement includes OnErrorEventHandlerForNodes;
diff --git a/dom/webidl/MediaCapabilities.webidl b/dom/webidl/MediaCapabilities.webidl
new file mode 100644
index 0000000000..514a86285f
--- /dev/null
+++ b/dom/webidl/MediaCapabilities.webidl
@@ -0,0 +1,87 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/media-capabilities/
+ *
+ * Copyright © 2018 the Contributors to the Media Capabilities Specification
+ */
+
+dictionary MediaConfiguration {
+  VideoConfiguration video;
+  AudioConfiguration audio;
+};
+
+dictionary MediaDecodingConfiguration : MediaConfiguration {
+  required MediaDecodingType type;
+};
+
+dictionary MediaEncodingConfiguration : MediaConfiguration {
+  required MediaEncodingType type;
+};
+
+enum MediaDecodingType {
+  "file",
+  "media-source",
+};
+
+enum MediaEncodingType {
+  "record",
+  "transmission"
+};
+
+dictionary VideoConfiguration {
+  required DOMString contentType;
+  required unsigned long width;
+  required unsigned long height;
+  required unsigned long long bitrate;
+  required double framerate;
+  boolean hasAlphaChannel;
+  HdrMetadataType hdrMetadataType;
+  ColorGamut colorGamut;
+  TransferFunction transferFunction;
+  DOMString scalabilityMode;
+};
+
+enum HdrMetadataType {
+  "smpteSt2086",
+  "smpteSt2094-10",
+  "smpteSt2094-40"
+};
+
+enum ColorGamut {
+  "srgb",
+  "p3",
+  "rec2020"
+};
+
+enum TransferFunction {
+  "srgb",
+  "pq",
+  "hlg"
+};
+
+dictionary AudioConfiguration {
+  required DOMString contentType;
+  DOMString channels;
+  unsigned long long bitrate;
+  unsigned long samplerate;
+};
+
+[Exposed=(Window, Worker), Func="mozilla::dom::MediaCapabilities::Enabled",
+ HeaderFile="mozilla/dom/MediaCapabilities.h"]
+interface MediaCapabilitiesInfo {
+  readonly attribute boolean supported;
+  readonly attribute boolean smooth;
+  readonly attribute boolean powerEfficient;
+};
+
+[Exposed=(Window, Worker), Func="mozilla::dom::MediaCapabilities::Enabled"]
+interface MediaCapabilities {
+  [NewObject]
+  Promise<MediaCapabilitiesInfo> decodingInfo(MediaDecodingConfiguration configuration);
+  [NewObject]
+  Promise<MediaCapabilitiesInfo> encodingInfo(MediaEncodingConfiguration configuration);
+};
diff --git a/dom/webidl/MediaDebugInfo.webidl b/dom/webidl/MediaDebugInfo.webidl
new file mode 100644
index 0000000000..21140e9b8b
--- /dev/null
+++ b/dom/webidl/MediaDebugInfo.webidl
@@ -0,0 +1,235 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * This module defines dictonaries that are filled with debug information
+ * through GetDebugInfo() calls in the media component. To get the information
+ * filled and returned, we have two methods that return promises, one in
+ * HTMLMediaElement and one in MediaSource.
+ *
+ * If you need to add some extra info, there's one dictionary per class,
+ * following the pattern <ClassName>DebugInfo, where you can add some fields
+ * and fill them in the corresponding GetDebugInfo() call.
+ *
+ * Below is the structures returned.
+ *
+ * Used by HTMLMediaElement.GetMozRequestDebugInfo(), see HTMLMediaElement.webidl:
+ *
+ * HTMLMediaElementDebugInfo
+ *   EMEDebugInfo
+ *   MediaDecoderDebugInfo
+ *     MediaFormatReaderDebugInfo
+ *       MediaStateDebugInfo
+ *       MediaStateDebugInfo
+ *       MediaFrameStats
+ *     MediaDecoderStateMachineDebugInfo
+ *       MediaDecoderStateMachineDecodingStateDebugInfo
+ *       MediaSinkDebugInfo
+ *         VideoSinkDebugInfo
+ *         AudioSinkDebugInfo
+ *         DecodedStreamDebugInfo
+ *           DecodedStreamDataDebugInfo
+ *     MediaResourceDebugInfo
+ *       MediaCacheStreamDebugInfo
+ *
+ * Used by MediaSource.GetMozDebugReaderData(), see MediaSource.webidl:
+ *
+ * MediaSourceDecoderDebugInfo
+ *  MediaFormatReaderDebugInfo
+ *    MediaStateDebugInfo
+ *    MediaStateDebugInfo
+ *    MediaFrameStats
+ *  MediaSourceDemuxerDebugInfo
+ *    TrackBuffersManagerDebugInfo
+ *    TrackBuffersManagerDebugInfo
+ */
+dictionary MediaCacheStreamDebugInfo {
+  long long streamLength = 0;
+  long long channelOffset = 0;
+  boolean cacheSuspended = false;
+  boolean channelEnded = false;
+  long loadID = 0;
+};
+
+dictionary MediaResourceDebugInfo {
+  MediaCacheStreamDebugInfo cacheStream = {};
+};
+
+dictionary MediaDecoderDebugInfo {
+  DOMString instance = "";
+  unsigned long channels = 0;
+  unsigned long rate = 0;
+  boolean hasAudio = false;
+  boolean hasVideo = false;
+  DOMString PlayState = "";
+  DOMString containerType = "";
+  MediaFormatReaderDebugInfo reader = {};
+  MediaDecoderStateMachineDebugInfo stateMachine = {};
+  MediaResourceDebugInfo resource = {};
+};
+
+dictionary AudioSinkDebugInfo {
+  long long startTime = 0;
+  long long lastGoodPosition = 0;
+  boolean isPlaying = false;
+  boolean isStarted = false;
+  boolean audioEnded = false;
+  unsigned long outputRate = 0;
+  long long written = 0;
+  boolean hasErrored = false;
+  boolean playbackComplete = false;
+};
+
+dictionary AudioSinkWrapperDebugInfo {
+  boolean isPlaying = false;
+  boolean isStarted = false;
+  boolean audioEnded = false;
+  AudioSinkDebugInfo audioSink = {};
+};
+
+dictionary VideoSinkDebugInfo {
+  boolean isStarted = false;
+  boolean isPlaying = false;
+  boolean finished = false;
+  long size = 0;
+  long long videoFrameEndTime = 0;
+  boolean hasVideo = false;
+  boolean videoSinkEndRequestExists = false;
+  boolean endPromiseHolderIsEmpty = false;
+};
+
+dictionary DecodedStreamDataDebugInfo {
+  DOMString instance = "";
+  long long audioFramesWritten = 0;
+  long long streamAudioWritten = 0;
+  long long streamVideoWritten = 0;
+  long long nextAudioTime = 0;
+  long long lastVideoStartTime = 0;
+  long long lastVideoEndTime = 0;
+  boolean haveSentFinishAudio = false;
+  boolean haveSentFinishVideo = false;
+};
+
+dictionary DecodedStreamDebugInfo {
+  DOMString instance = "";
+  long long startTime = 0;
+  long long lastOutputTime = 0;
+  long playing = 0;
+  long long lastAudio = 0;
+  boolean audioQueueFinished = false;
+  long audioQueueSize = 0;
+  DecodedStreamDataDebugInfo data = {};
+};
+
+dictionary MediaSinkDebugInfo {
+  AudioSinkWrapperDebugInfo audioSinkWrapper = {};
+  VideoSinkDebugInfo videoSink = {};
+  DecodedStreamDebugInfo decodedStream = {};
+};
+
+dictionary MediaDecoderStateMachineDecodingStateDebugInfo {
+  boolean isPrerolling = false;
+};
+
+dictionary MediaDecoderStateMachineDebugInfo {
+  long long duration = 0;
+  long long mediaTime = 0;
+  long long clock = 0;
+  DOMString state = "";
+  long playState = 0;
+  boolean sentFirstFrameLoadedEvent = false;
+  boolean isPlaying = false;
+  DOMString audioRequestStatus = "";
+  DOMString videoRequestStatus = "";
+  long long decodedAudioEndTime = 0;
+  long long decodedVideoEndTime = 0;
+  boolean audioCompleted = false;
+  boolean videoCompleted = false;
+  MediaDecoderStateMachineDecodingStateDebugInfo stateObj = {};
+  MediaSinkDebugInfo mediaSink = {};
+};
+
+dictionary MediaStateDebugInfo {
+  boolean needInput = false;
+  boolean hasPromise = false;
+  boolean waitingPromise = false;
+  boolean hasDemuxRequest = false;
+  long demuxQueueSize = 0;
+  boolean hasDecoder = false;
+  double timeTreshold = 0.0;
+  boolean timeTresholdHasSeeked = false;
+  long long numSamplesInput = 0;
+  long long numSamplesOutput = 0;
+  long queueSize = 0;
+  long pending = 0;
+  boolean waitingForData = false;
+  long demuxEOS = 0;
+  long drainState = 0;
+  boolean waitingForKey = false;
+  long lastStreamSourceID = 0;
+};
+
+dictionary MediaFrameStats {
+  long long droppedDecodedFrames = 0;
+  long long droppedSinkFrames = 0;
+  long long droppedCompositorFrames = 0;
+};
+
+dictionary MediaFormatReaderDebugInfo {
+  DOMString videoType = "";
+  DOMString videoDecoderName = "";
+  long videoWidth = 0;
+  long videoHeight = 0;
+  double videoRate = 0.0;
+  DOMString audioType = "";
+  DOMString audioDecoderName = "";
+  boolean videoHardwareAccelerated = false;
+  long long videoNumSamplesOutputTotal = 0;
+  long long videoNumSamplesSkippedTotal = 0;
+  long audioChannels = 0;
+  double audioRate = 0.0;
+  long long audioFramesDecoded = 0;
+  MediaStateDebugInfo audioState = {};
+  MediaStateDebugInfo videoState = {};
+  MediaFrameStats frameStats = {};
+};
+
+dictionary BufferRange {
+  double start = 0;
+  double end = 0;
+};
+
+dictionary TrackBuffersManagerDebugInfo {
+  DOMString type = "";
+  double nextSampleTime = 0.0;
+  long numSamples = 0;
+  long bufferSize = 0;
+  long evictable = 0;
+  long nextGetSampleIndex = 0;
+  long nextInsertionIndex = 0;
+  sequence<BufferRange> ranges = [];
+};
+
+dictionary MediaSourceDemuxerDebugInfo {
+  TrackBuffersManagerDebugInfo audioTrack = {};
+  TrackBuffersManagerDebugInfo videoTrack = {};
+};
+
+dictionary MediaSourceDecoderDebugInfo {
+  MediaFormatReaderDebugInfo reader = {};
+  MediaSourceDemuxerDebugInfo demuxer = {};
+};
+
+dictionary EMEDebugInfo {
+  DOMString keySystem = "";
+  DOMString sessionsInfo = "";
+};
+
+dictionary HTMLMediaElementDebugInfo {
+  unsigned long compositorDroppedFrames = 0;
+  EMEDebugInfo EMEInfo = {};
+  MediaDecoderDebugInfo decoder = {};
+};
diff --git a/dom/webidl/MediaDeviceInfo.webidl b/dom/webidl/MediaDeviceInfo.webidl
new file mode 100644
index 0000000000..7bceadc22e
--- /dev/null
+++ b/dom/webidl/MediaDeviceInfo.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ */
+
+enum MediaDeviceKind {
+  "audioinput",
+  "audiooutput",
+  "videoinput"
+};
+
+[Func="Navigator::HasUserMediaSupport",
+ Exposed=Window]
+interface MediaDeviceInfo {
+  readonly attribute DOMString       deviceId;
+  readonly attribute MediaDeviceKind kind;
+  readonly attribute DOMString       label;
+  readonly attribute DOMString       groupId;
+
+  [Default] object toJSON();
+};
diff --git a/dom/webidl/MediaDevices.webidl b/dom/webidl/MediaDevices.webidl
new file mode 100644
index 0000000000..d291f722de
--- /dev/null
+++ b/dom/webidl/MediaDevices.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="Navigator::HasUserMediaSupport",
+ Exposed=Window]
+interface MediaDevices : EventTarget {
+  [Pref="media.ondevicechange.enabled"]
+  attribute EventHandler ondevicechange;
+  MediaTrackSupportedConstraints getSupportedConstraints();
+
+  [NewObject, UseCounter]
+  Promise<sequence<MediaDeviceInfo>> enumerateDevices();
+
+  [NewObject, NeedsCallerType, UseCounter]
+  Promise<MediaStream> getUserMedia(optional MediaStreamConstraints constraints = {});
+
+  // We need [SecureContext] in case media.devices.insecure.enabled = true
+  // because we don't want that legacy pref to expose this newer method.
+  [SecureContext, Pref="media.getdisplaymedia.enabled", NewObject, NeedsCallerType, UseCounter]
+  Promise<MediaStream> getDisplayMedia(optional DisplayMediaStreamConstraints constraints = {});
+};
+
+// https://w3c.github.io/mediacapture-output/#audiooutputoptions-dictionary
+dictionary AudioOutputOptions {
+  DOMString deviceId = "";
+};
+// https://w3c.github.io/mediacapture-output/#mediadevices-extensions
+partial interface MediaDevices {
+  [SecureContext, Pref="media.setsinkid.enabled", NewObject, NeedsCallerType]
+  Promise<MediaDeviceInfo> selectAudioOutput(optional AudioOutputOptions options = {});
+};
diff --git a/dom/webidl/MediaElementAudioSourceNode.webidl b/dom/webidl/MediaElementAudioSourceNode.webidl
new file mode 100644
index 0000000000..7417b7c5be
--- /dev/null
+++ b/dom/webidl/MediaElementAudioSourceNode.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary MediaElementAudioSourceOptions {
+    required HTMLMediaElement mediaElement;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface MediaElementAudioSourceNode : AudioNode {
+  [Throws]
+  constructor(AudioContext context, MediaElementAudioSourceOptions options);
+
+  readonly attribute HTMLMediaElement mediaElement;
+};
+
+// Mozilla extensions
+MediaElementAudioSourceNode includes AudioNodePassThrough;
diff --git a/dom/webidl/MediaEncryptedEvent.webidl b/dom/webidl/MediaEncryptedEvent.webidl
new file mode 100644
index 0000000000..864ed5d422
--- /dev/null
+++ b/dom/webidl/MediaEncryptedEvent.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface MediaEncryptedEvent : Event {
+  [Throws]
+  constructor(DOMString type,
+              optional MediaKeyNeededEventInit eventInitDict = {});
+
+  readonly attribute DOMString initDataType;
+  [Throws]
+  readonly attribute ArrayBuffer? initData;
+};
+
+dictionary MediaKeyNeededEventInit : EventInit {
+  DOMString initDataType = "";
+  ArrayBuffer? initData = null;
+};
diff --git a/dom/webidl/MediaError.webidl b/dom/webidl/MediaError.webidl
new file mode 100644
index 0000000000..f882e21386
--- /dev/null
+++ b/dom/webidl/MediaError.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/html/#mediaerror
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface MediaError {
+  // Keep these constants in sync with the ones defined in HTMLMediaElement.h
+  const unsigned short MEDIA_ERR_ABORTED = 1;
+  const unsigned short MEDIA_ERR_NETWORK = 2;
+  const unsigned short MEDIA_ERR_DECODE = 3;
+  const unsigned short MEDIA_ERR_SRC_NOT_SUPPORTED = 4;
+
+  [Constant]
+  readonly attribute unsigned short code;
+  readonly attribute DOMString message;
+};
diff --git a/dom/webidl/MediaKeyError.webidl b/dom/webidl/MediaKeyError.webidl
new file mode 100644
index 0000000000..73e714e51f
--- /dev/null
+++ b/dom/webidl/MediaKeyError.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+// According to the spec, "The future of error events and MediaKeyError
+// is uncertain."
+// https://www.w3.org/Bugs/Public/show_bug.cgi?id=21798
+[Exposed=Window]
+interface MediaKeyError : Event {
+  readonly attribute unsigned long systemCode;
+};
diff --git a/dom/webidl/MediaKeyMessageEvent.webidl b/dom/webidl/MediaKeyMessageEvent.webidl
new file mode 100644
index 0000000000..28f6ceabcb
--- /dev/null
+++ b/dom/webidl/MediaKeyMessageEvent.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+enum MediaKeyMessageType {
+  "license-request",
+  "license-renewal",
+  "license-release",
+  "individualization-request"
+};
+
+[Exposed=Window]
+interface MediaKeyMessageEvent : Event {
+  [Throws]
+  constructor(DOMString type, MediaKeyMessageEventInit eventInitDict);
+
+  readonly attribute MediaKeyMessageType messageType;
+  [Throws]
+  readonly attribute ArrayBuffer message;
+};
+
+dictionary MediaKeyMessageEventInit : EventInit {
+  required MediaKeyMessageType messageType;
+  required ArrayBuffer message;
+};
diff --git a/dom/webidl/MediaKeySession.webidl b/dom/webidl/MediaKeySession.webidl
new file mode 100644
index 0000000000..050923c546
--- /dev/null
+++ b/dom/webidl/MediaKeySession.webidl
@@ -0,0 +1,46 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface MediaKeySession : EventTarget {
+  // error state
+  readonly attribute MediaKeyError? error;
+
+  // session properties
+  readonly attribute DOMString sessionId;
+
+  readonly attribute unrestricted double expiration;
+
+  readonly attribute Promise<undefined> closed;
+
+  readonly attribute MediaKeyStatusMap keyStatuses;
+
+  attribute EventHandler onkeystatuseschange;
+
+  attribute EventHandler onmessage;
+
+  [NewObject]
+  Promise<undefined> generateRequest(DOMString initDataType, BufferSource initData);
+
+  [NewObject]
+  Promise<boolean> load(DOMString sessionId);
+
+  // session operations
+  [NewObject]
+  Promise<undefined> update(BufferSource response);
+
+  [NewObject]
+  Promise<undefined> close();
+
+  [NewObject]
+  Promise<undefined> remove();
+};
diff --git a/dom/webidl/MediaKeyStatusMap.webidl b/dom/webidl/MediaKeyStatusMap.webidl
new file mode 100644
index 0000000000..8340a15769
--- /dev/null
+++ b/dom/webidl/MediaKeyStatusMap.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+enum MediaKeyStatus {
+  "usable",
+  "expired",
+  "released",
+  "output-restricted",
+  "output-downscaled",
+  "status-pending",
+  "internal-error"
+};
+
+[Exposed=Window]
+interface MediaKeyStatusMap {
+  iterable<ArrayBuffer,MediaKeyStatus>;
+  readonly attribute unsigned long size;
+  boolean has (BufferSource keyId);
+  [Throws]
+  (MediaKeyStatus or undefined) get (BufferSource keyId);
+};
diff --git a/dom/webidl/MediaKeySystemAccess.webidl b/dom/webidl/MediaKeySystemAccess.webidl
new file mode 100644
index 0000000000..21baadc159
--- /dev/null
+++ b/dom/webidl/MediaKeySystemAccess.webidl
@@ -0,0 +1,43 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+enum MediaKeysRequirement {
+  "required",
+  "optional",
+  "not-allowed"
+};
+
+dictionary MediaKeySystemMediaCapability {
+   DOMString contentType = "";
+   DOMString robustness = "";
+   [Pref="media.eme.encrypted-media-encryption-scheme.enabled"]
+   DOMString? encryptionScheme = null;
+};
+
+dictionary MediaKeySystemConfiguration {
+  DOMString                               label = "";
+  sequence<DOMString>                     initDataTypes = [];
+  sequence<MediaKeySystemMediaCapability> audioCapabilities = [];
+  sequence<MediaKeySystemMediaCapability> videoCapabilities = [];
+  MediaKeysRequirement                    distinctiveIdentifier = "optional";
+  MediaKeysRequirement                    persistentState = "optional";
+  sequence<DOMString>                     sessionTypes;
+};
+
+[Exposed=Window]
+interface MediaKeySystemAccess {
+  readonly    attribute DOMString keySystem;
+  [NewObject]
+  MediaKeySystemConfiguration getConfiguration();
+  [NewObject]
+  Promise<MediaKeys> createMediaKeys();
+};
diff --git a/dom/webidl/MediaKeys.webidl b/dom/webidl/MediaKeys.webidl
new file mode 100644
index 0000000000..538c336ee9
--- /dev/null
+++ b/dom/webidl/MediaKeys.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+// Note: "persistent-usage-record" session type is unsupported yet, as
+// it's marked as "at risk" in the spec, and Chrome doesn't support it.
+enum MediaKeySessionType {
+  "temporary",
+  "persistent-license",
+  // persistent-usage-record,
+};
+
+// https://github.com/WICG/media-capabilities/blob/master/eme-extension-policy-check.md
+dictionary MediaKeysPolicy {
+  DOMString minHdcpVersion = "";
+};
+
+[Exposed=Window]
+interface MediaKeys {
+  readonly attribute DOMString keySystem;
+
+  [NewObject, Throws]
+  MediaKeySession createSession(optional MediaKeySessionType sessionType = "temporary");
+
+  [NewObject]
+  Promise<undefined> setServerCertificate(BufferSource serverCertificate);
+
+  [Pref="media.eme.hdcp-policy-check.enabled", NewObject]
+  Promise<MediaKeyStatus> getStatusForPolicy(optional MediaKeysPolicy policy = {});
+};
diff --git a/dom/webidl/MediaKeysRequestStatus.webidl b/dom/webidl/MediaKeysRequestStatus.webidl
new file mode 100644
index 0000000000..3d9aa1e282
--- /dev/null
+++ b/dom/webidl/MediaKeysRequestStatus.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum MediaKeySystemStatus {
+  "available",
+  "api-disabled",
+  "cdm-disabled",
+  "cdm-not-supported",
+  "cdm-not-installed",
+  "cdm-created",
+};
+
+/* Note: This dictionary and enum is only used by Gecko to convey messages
+ * to chrome JS code. It is not exposed to the web.
+ */
+[GenerateToJSON]
+dictionary RequestMediaKeySystemAccessNotification {
+  required DOMString keySystem;
+  required MediaKeySystemStatus status;
+};
diff --git a/dom/webidl/MediaList.webidl b/dom/webidl/MediaList.webidl
new file mode 100644
index 0000000000..6b58a809fa
--- /dev/null
+++ b/dom/webidl/MediaList.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// https://drafts.csswg.org/cssom/#the-medialist-interface
+
+[Exposed=Window]
+interface MediaList {
+  stringifier attribute [LegacyNullToEmptyString] UTF8String mediaText;
+
+  readonly attribute unsigned long    length;
+  getter UTF8String? item(unsigned long index);
+  [Throws]
+  undefined          deleteMedium(UTF8String oldMedium);
+  [Throws]
+  undefined          appendMedium(UTF8String newMedium);
+};
diff --git a/dom/webidl/MediaQueryList.webidl b/dom/webidl/MediaQueryList.webidl
new file mode 100644
index 0000000000..f1211c5713
--- /dev/null
+++ b/dom/webidl/MediaQueryList.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/cssom-view/#mediaquerylist
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[ProbablyShortLivingWrapper,
+ Exposed=Window]
+interface MediaQueryList : EventTarget {
+  readonly attribute UTF8String media;
+  readonly attribute boolean matches;
+
+  [Throws]
+  undefined addListener(EventListener? listener);
+
+  [Throws]
+  undefined removeListener(EventListener? listener);
+
+           attribute EventHandler onchange;
+};
diff --git a/dom/webidl/MediaQueryListEvent.webidl b/dom/webidl/MediaQueryListEvent.webidl
new file mode 100644
index 0000000000..4f41ca480a
--- /dev/null
+++ b/dom/webidl/MediaQueryListEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * https://drafts.csswg.org/cssom-view/#mediaquerylistevent
+ */
+
+[Exposed=Window]
+interface MediaQueryListEvent : Event {
+  constructor(DOMString type,
+              optional MediaQueryListEventInit eventInitDict = {});
+
+  readonly attribute UTF8String media;
+  readonly attribute boolean matches;
+};
+
+dictionary MediaQueryListEventInit : EventInit {
+  UTF8String media = "";
+  boolean matches = false;
+};
diff --git a/dom/webidl/MediaRecorder.webidl b/dom/webidl/MediaRecorder.webidl
new file mode 100644
index 0000000000..d106d5978c
--- /dev/null
+++ b/dom/webidl/MediaRecorder.webidl
@@ -0,0 +1,54 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/dap/raw-file/default/media-stream-capture/MediaRecorder.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum RecordingState { "inactive", "recording", "paused" };
+
+[Exposed=Window]
+interface MediaRecorder : EventTarget {
+  [Throws]
+  constructor(MediaStream stream, optional MediaRecorderOptions options = {});
+  [Throws]
+  constructor(AudioNode node, optional unsigned long output = 0,
+              optional MediaRecorderOptions options = {});
+  readonly attribute MediaStream stream;
+  readonly attribute DOMString mimeType;
+  readonly attribute RecordingState state;
+  attribute EventHandler onstart;
+  attribute EventHandler onstop;
+  attribute EventHandler ondataavailable;
+  attribute EventHandler onpause;
+  attribute EventHandler onresume;
+  attribute EventHandler onerror;
+  readonly attribute unsigned long videoBitsPerSecond;
+  readonly attribute unsigned long audioBitsPerSecond;
+
+
+  [Throws]
+  undefined start(optional unsigned long timeslice);
+  [Throws]
+  undefined stop();
+  [Throws]
+  undefined pause();
+  [Throws]
+  undefined resume();
+  [Throws]
+  undefined requestData();
+
+  static boolean isTypeSupported(DOMString type);
+};
+
+dictionary MediaRecorderOptions {
+  DOMString mimeType = "";
+  unsigned long audioBitsPerSecond;
+  unsigned long videoBitsPerSecond;
+  unsigned long bitsPerSecond;
+};
diff --git a/dom/webidl/MediaRecorderErrorEvent.webidl b/dom/webidl/MediaRecorderErrorEvent.webidl
new file mode 100644
index 0000000000..0158d4b52a
--- /dev/null
+++ b/dom/webidl/MediaRecorderErrorEvent.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/mediacapture-record/
+ *
+ * Copyright © 2017 W3C® (MIT, ERCIM, Keio, Beihang). W3C liability, trademark
+ * and document use rules apply.
+ */
+
+dictionary MediaRecorderErrorEventInit : EventInit {
+  required DOMException error;
+};
+
+[Exposed=Window]
+interface MediaRecorderErrorEvent : Event {
+  constructor(DOMString type, MediaRecorderErrorEventInit eventInitDict);
+
+  [SameObject] readonly attribute DOMException error;
+};
diff --git a/dom/webidl/MediaSession.webidl b/dom/webidl/MediaSession.webidl
new file mode 100644
index 0000000000..51d97eee1f
--- /dev/null
+++ b/dom/webidl/MediaSession.webidl
@@ -0,0 +1,85 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/mediasession/#idl-index
+ */
+
+enum MediaSessionPlaybackState {
+  "none",
+  "paused",
+  "playing"
+};
+
+enum MediaSessionAction {
+  "play",
+  "pause",
+  "seekbackward",
+  "seekforward",
+  "previoustrack",
+  "nexttrack",
+  "skipad",
+  "seekto",
+  "stop",
+};
+
+callback MediaSessionActionHandler = undefined(MediaSessionActionDetails details);
+
+[Exposed=Window, Pref="dom.media.mediasession.enabled"]
+interface MediaSession {
+  attribute MediaMetadata? metadata;
+
+  attribute MediaSessionPlaybackState playbackState;
+
+  undefined setActionHandler(MediaSessionAction action, MediaSessionActionHandler? handler);
+
+  [Throws]
+  undefined setPositionState(optional MediaPositionState state = {});
+
+  // Fire the action handler. It's test-only for now.
+  [ChromeOnly]
+  undefined notifyHandler(MediaSessionActionDetails details);
+};
+
+[Exposed=Window, Pref="dom.media.mediasession.enabled"]
+interface MediaMetadata {
+  [Throws]
+  constructor(optional MediaMetadataInit init = {});
+
+  attribute DOMString title;
+  attribute DOMString artist;
+  attribute DOMString album;
+  // https://github.com/w3c/mediasession/issues/237
+  // Take and return `MediaImage` on setter and getter.
+  [Frozen, Cached, Pure, Throws]
+  attribute sequence<object> artwork;
+};
+
+dictionary MediaMetadataInit {
+  DOMString title = "";
+  DOMString artist = "";
+  DOMString album = "";
+  sequence<MediaImage> artwork = [];
+};
+
+dictionary MediaImage {
+  required USVString src;
+  DOMString sizes = "";
+  DOMString type = "";
+};
+
+// Spec issue https://github.com/w3c/mediasession/issues/254
+dictionary MediaSessionActionDetails {
+  required MediaSessionAction action;
+  double seekOffset;
+  double seekTime;
+  boolean fastSeek;
+};
+
+dictionary MediaPositionState {
+  double duration;
+  double playbackRate;
+  double position;
+};
diff --git a/dom/webidl/MediaSource.webidl b/dom/webidl/MediaSource.webidl
new file mode 100644
index 0000000000..278bf3a237
--- /dev/null
+++ b/dom/webidl/MediaSource.webidl
@@ -0,0 +1,51 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum MediaSourceReadyState {
+  "closed",
+  "open",
+  "ended"
+};
+
+enum MediaSourceEndOfStreamError {
+  "network",
+  "decode"
+};
+
+[Pref="media.mediasource.enabled",
+ Exposed=Window]
+interface MediaSource : EventTarget {
+  [Throws]
+  constructor();
+
+  readonly attribute SourceBufferList sourceBuffers;
+  readonly attribute SourceBufferList activeSourceBuffers;
+  readonly attribute MediaSourceReadyState readyState;
+  [SetterThrows]
+  attribute unrestricted double duration;
+  attribute EventHandler onsourceopen;
+  attribute EventHandler onsourceended;
+  attribute EventHandler onsourceclose;
+  [NewObject, Throws]
+  SourceBuffer addSourceBuffer(DOMString type);
+  [Throws]
+  undefined removeSourceBuffer(SourceBuffer sourceBuffer);
+  [Throws]
+  undefined endOfStream(optional MediaSourceEndOfStreamError error);
+  [Throws]
+  undefined setLiveSeekableRange(double start, double end);
+  [Throws]
+  undefined clearLiveSeekableRange();
+  static boolean isTypeSupported(DOMString type);
+  [NewObject, ChromeOnly]
+  Promise<MediaSourceDecoderDebugInfo> mozDebugReaderData();
+};
diff --git a/dom/webidl/MediaStream.webidl b/dom/webidl/MediaStream.webidl
new file mode 100644
index 0000000000..3718e436ad
--- /dev/null
+++ b/dom/webidl/MediaStream.webidl
@@ -0,0 +1,59 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origins of this IDL file are
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ *
+ * Copyright � 2012 W3C� (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// These dictionaries need to be in a separate file from their
+// MediaTrackConstraints* counterparts due to a webidl compiler limitation.
+
+dictionary MediaStreamConstraints {
+    (boolean or MediaTrackConstraints) audio = false;
+    (boolean or MediaTrackConstraints) video = false;
+    boolean picture = false; // Mozilla legacy
+    boolean fake;       // For testing purpose. Generates frames of solid
+                        // colors if video is enabled, and sound of 1Khz sine
+                        // wave if audio is enabled.
+    DOMString? peerIdentity = null;
+};
+
+dictionary DisplayMediaStreamConstraints {
+    (boolean or MediaTrackConstraints) video = true;
+    (boolean or MediaTrackConstraints) audio = false;
+};
+
+[Exposed=Window]
+interface MediaStream : EventTarget {
+    [Throws]
+    constructor();
+    [Throws]
+    constructor(MediaStream stream);
+    [Throws]
+    constructor(sequence<MediaStreamTrack> tracks);
+
+    readonly    attribute DOMString    id;
+    sequence<MediaStreamTrack> getAudioTracks ();
+    sequence<MediaStreamTrack> getVideoTracks ();
+    sequence<MediaStreamTrack> getTracks ();
+    MediaStreamTrack?          getTrackById (DOMString trackId);
+    undefined                  addTrack (MediaStreamTrack track);
+    undefined                  removeTrack (MediaStreamTrack track);
+    MediaStream                clone ();
+    readonly    attribute boolean      active;
+                attribute EventHandler onaddtrack;
+                attribute EventHandler onremovetrack;
+
+    [ChromeOnly, NewObject]
+    static Promise<long> countUnderlyingStreams();
+
+    // Webrtc allows the remote side to name a stream whatever it wants, and we
+    // need to surface this to content.
+    [ChromeOnly]
+    undefined assignId(DOMString id);
+};
diff --git a/dom/webidl/MediaStreamAudioDestinationNode.webidl b/dom/webidl/MediaStreamAudioDestinationNode.webidl
new file mode 100644
index 0000000000..2c60b9eaf0
--- /dev/null
+++ b/dom/webidl/MediaStreamAudioDestinationNode.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface MediaStreamAudioDestinationNode : AudioNode {
+    [Throws]
+    constructor(AudioContext context, optional AudioNodeOptions options = {});
+
+    [BinaryName="DOMStream"]
+    readonly attribute MediaStream stream;
+};
diff --git a/dom/webidl/MediaStreamAudioSourceNode.webidl b/dom/webidl/MediaStreamAudioSourceNode.webidl
new file mode 100644
index 0000000000..5104fe3bf3
--- /dev/null
+++ b/dom/webidl/MediaStreamAudioSourceNode.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary MediaStreamAudioSourceOptions {
+    required MediaStream mediaStream;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface MediaStreamAudioSourceNode : AudioNode {
+  [Throws]
+  constructor(AudioContext context, MediaStreamAudioSourceOptions options);
+
+  [BinaryName="GetMediaStream"]
+  readonly attribute MediaStream mediaStream;
+};
+
+// Mozilla extensions
+MediaStreamAudioSourceNode includes AudioNodePassThrough;
diff --git a/dom/webidl/MediaStreamError.webidl b/dom/webidl/MediaStreamError.webidl
new file mode 100644
index 0000000000..a1b76c5ea1
--- /dev/null
+++ b/dom/webidl/MediaStreamError.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/mediacapture-main/getusermedia.html#idl-def-MediaStreamError
+ */
+
+// The future of MediaStreamError is uncertain.
+// https://www.w3.org/Bugs/Public/show_bug.cgi?id=26776
+
+// TODO: This is an 'exception', not an interface, by virtue of needing to be
+// passed as a promise rejection-reason. Revisit if DOMException grows a customArg
+
+[ExceptionClass, LegacyNoInterfaceObject,
+ Exposed=Window]
+interface MediaStreamError {
+  readonly attribute DOMString  name;
+  readonly attribute DOMString? message;
+  readonly attribute DOMString? constraint;
+};
diff --git a/dom/webidl/MediaStreamEvent.webidl b/dom/webidl/MediaStreamEvent.webidl
new file mode 100644
index 0000000000..752e43c13b
--- /dev/null
+++ b/dom/webidl/MediaStreamEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#mediastreamevent
+ */
+
+dictionary MediaStreamEventInit : EventInit {
+    MediaStream? stream = null;
+};
+
+[Pref="media.peerconnection.enabled",
+ Exposed=Window]
+interface MediaStreamEvent : Event {
+  constructor(DOMString type, optional MediaStreamEventInit eventInitDict = {});
+
+  readonly attribute MediaStream? stream;
+};
diff --git a/dom/webidl/MediaStreamTrack.webidl b/dom/webidl/MediaStreamTrack.webidl
new file mode 100644
index 0000000000..afd2f925f7
--- /dev/null
+++ b/dom/webidl/MediaStreamTrack.webidl
@@ -0,0 +1,120 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// These two enums are in the spec even though they're not used directly in the
+// API due to https://www.w3.org/Bugs/Public/show_bug.cgi?id=19936
+// Their binding code is used in the implementation.
+
+enum VideoFacingModeEnum {
+    "user",
+    "environment",
+    "left",
+    "right"
+};
+
+enum MediaSourceEnum {
+    "camera",
+    "screen",
+    "application",
+    "window",
+    "browser",
+    "microphone",
+    "audioCapture",
+    "other"
+    // If values are added, adjust n_values in Histograms.json (2 places)
+};
+
+dictionary ConstrainLongRange {
+    long min;
+    long max;
+    long exact;
+    long ideal;
+};
+
+dictionary ConstrainDoubleRange {
+    double min;
+    double max;
+    double exact;
+    double ideal;
+};
+
+dictionary ConstrainBooleanParameters {
+    boolean exact;
+    boolean ideal;
+};
+
+dictionary ConstrainDOMStringParameters {
+    (DOMString or sequence<DOMString>) exact;
+    (DOMString or sequence<DOMString>) ideal;
+};
+
+typedef (long or ConstrainLongRange) ConstrainLong;
+typedef (double or ConstrainDoubleRange) ConstrainDouble;
+typedef (boolean or ConstrainBooleanParameters) ConstrainBoolean;
+typedef (DOMString or sequence<DOMString> or ConstrainDOMStringParameters) ConstrainDOMString;
+
+// Note: When adding new constraints, remember to update the SelectSettings()
+// function in MediaManager.cpp to make OverconstrainedError's constraint work!
+
+dictionary MediaTrackConstraintSet {
+    ConstrainLong width;
+    ConstrainLong height;
+    ConstrainDouble frameRate;
+    ConstrainDOMString facingMode;
+    DOMString mediaSource;
+    long long browserWindow;
+    boolean scrollWithPage;
+    ConstrainDOMString deviceId;
+    ConstrainDOMString groupId;
+    ConstrainLong viewportOffsetX;
+    ConstrainLong viewportOffsetY;
+    ConstrainLong viewportWidth;
+    ConstrainLong viewportHeight;
+    ConstrainBoolean echoCancellation;
+    ConstrainBoolean noiseSuppression;
+    ConstrainBoolean autoGainControl;
+    ConstrainLong channelCount;
+};
+
+[GenerateToJSON]
+dictionary MediaTrackConstraints : MediaTrackConstraintSet {
+    sequence<MediaTrackConstraintSet> advanced;
+};
+
+enum MediaStreamTrackState {
+    "live",
+    "ended"
+};
+
+[Exposed=Window]
+interface MediaStreamTrack : EventTarget {
+    readonly    attribute DOMString             kind;
+    readonly    attribute DOMString             id;
+    [NeedsCallerType]
+    readonly    attribute DOMString             label;
+                attribute boolean               enabled;
+    readonly    attribute boolean               muted;
+                attribute EventHandler          onmute;
+                attribute EventHandler          onunmute;
+    readonly    attribute MediaStreamTrackState readyState;
+                attribute EventHandler          onended;
+    MediaStreamTrack       clone ();
+    undefined              stop ();
+//  MediaTrackCapabilities getCapabilities ();
+    MediaTrackConstraints  getConstraints ();
+    [NeedsCallerType]
+    MediaTrackSettings     getSettings ();
+
+    [NewObject, NeedsCallerType]
+    Promise<undefined>     applyConstraints (optional MediaTrackConstraints constraints = {});
+//              attribute EventHandler          onoverconstrained;
+};
diff --git a/dom/webidl/MediaStreamTrackAudioSourceNode.webidl b/dom/webidl/MediaStreamTrackAudioSourceNode.webidl
new file mode 100644
index 0000000000..abf66cb634
--- /dev/null
+++ b/dom/webidl/MediaStreamTrackAudioSourceNode.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary MediaStreamTrackAudioSourceOptions {
+    required MediaStreamTrack mediaStreamTrack;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface MediaStreamTrackAudioSourceNode : AudioNode {
+  [Throws]
+  constructor(AudioContext context, MediaStreamTrackAudioSourceOptions options);
+};
+
+// Mozilla extensions
+MediaStreamTrackAudioSourceNode includes AudioNodePassThrough;
diff --git a/dom/webidl/MediaStreamTrackEvent.webidl b/dom/webidl/MediaStreamTrackEvent.webidl
new file mode 100644
index 0000000000..8a202581e7
--- /dev/null
+++ b/dom/webidl/MediaStreamTrackEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#mediastreamevent
+ */
+
+dictionary MediaStreamTrackEventInit : EventInit {
+    required MediaStreamTrack track;
+};
+
+[Exposed=Window]
+interface MediaStreamTrackEvent : Event {
+    constructor(DOMString type, MediaStreamTrackEventInit eventInitDict);
+
+    [SameObject]
+    readonly        attribute MediaStreamTrack track;
+};
diff --git a/dom/webidl/MediaTrackSettings.webidl b/dom/webidl/MediaTrackSettings.webidl
new file mode 100644
index 0000000000..24642e063e
--- /dev/null
+++ b/dom/webidl/MediaTrackSettings.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/mediacapture-main/getusermedia.html
+ */
+
+dictionary MediaTrackSettings {
+    long      width;
+    long      height;
+    double    frameRate;
+    DOMString facingMode;
+    boolean   echoCancellation;
+    boolean   autoGainControl;
+    boolean   noiseSuppression;
+    long      channelCount;
+    DOMString deviceId;
+    DOMString groupId;
+
+    // Mozilla-specific extensions:
+
+    // http://fluffy.github.io/w3c-screen-share/#screen-based-video-constraints
+    // OBE by http://w3c.github.io/mediacapture-screen-share
+
+    DOMString mediaSource;
+
+    // Experimental https://bugzilla.mozilla.org/show_bug.cgi?id=1131568#c3
+    //              https://bugzilla.mozilla.org/show_bug.cgi?id=1193075
+
+    long long browserWindow;
+    boolean scrollWithPage;
+    long viewportOffsetX;
+    long viewportOffsetY;
+    long viewportWidth;
+    long viewportHeight;
+};
diff --git a/dom/webidl/MediaTrackSupportedConstraints.webidl b/dom/webidl/MediaTrackSupportedConstraints.webidl
new file mode 100644
index 0000000000..a242eae59a
--- /dev/null
+++ b/dom/webidl/MediaTrackSupportedConstraints.webidl
@@ -0,0 +1,43 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ */
+
+dictionary MediaTrackSupportedConstraints {
+    boolean width = true;
+    boolean height = true;
+    boolean aspectRatio;        // to be supported
+    boolean frameRate = true;
+    boolean facingMode = true;
+    boolean volume;             // to be supported
+    boolean sampleRate;         // to be supported
+    boolean sampleSize;         // to be supported
+    boolean echoCancellation = true;
+    boolean noiseSuppression = true;
+    boolean autoGainControl = true;
+    boolean latency;            // to be supported
+    boolean channelCount = true;
+    boolean deviceId = true;
+    boolean groupId = true;
+
+    // Mozilla-specific extensions:
+
+    // http://fluffy.github.io/w3c-screen-share/#screen-based-video-constraints
+    // OBE by http://w3c.github.io/mediacapture-screen-share
+
+    boolean mediaSource = true;
+
+    // Experimental https://bugzilla.mozilla.org/show_bug.cgi?id=1131568#c3
+    //              https://bugzilla.mozilla.org/show_bug.cgi?id=1193075
+
+    boolean browserWindow = true;
+    boolean scrollWithPage = true;
+    boolean viewportOffsetX = true;
+    boolean viewportOffsetY = true;
+    boolean viewportWidth = true;
+    boolean viewportHeight = true;
+};
diff --git a/dom/webidl/MerchantValidationEvent.webidl b/dom/webidl/MerchantValidationEvent.webidl
new file mode 100644
index 0000000000..5f2145e979
--- /dev/null
+++ b/dom/webidl/MerchantValidationEvent.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://w3c.github.io/payment-request/#merchantvalidationevent-interface
+ *   https://w3c.github.io/payment-request/#merchantvalidationeventinit-dictionary
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[SecureContext,
+Exposed=Window,
+Func="mozilla::dom::PaymentRequest::PrefEnabled"]
+interface MerchantValidationEvent : Event {
+  [Throws]
+  constructor(DOMString type,
+              optional MerchantValidationEventInit eventInitDict = {});
+
+  readonly attribute DOMString methodName;
+  readonly attribute USVString validationURL;
+  [Throws]
+  undefined complete(Promise<any> merchantSessionPromise);
+};
+
+dictionary MerchantValidationEventInit : EventInit {
+  DOMString methodName = "";
+  USVString validationURL = "";
+};
diff --git a/dom/webidl/MessageChannel.webidl b/dom/webidl/MessageChannel.webidl
new file mode 100644
index 0000000000..57e5f99311
--- /dev/null
+++ b/dom/webidl/MessageChannel.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * http://www.whatwg.org/specs/web-apps/current-work/#channel-messaging
+ */
+
+[Exposed=(Window,Worker)]
+interface MessageChannel {
+  [Throws]
+  constructor();
+
+  readonly attribute MessagePort port1;
+  readonly attribute MessagePort port2;
+};
diff --git a/dom/webidl/MessageEvent.webidl b/dom/webidl/MessageEvent.webidl
new file mode 100644
index 0000000000..1dfe07744c
--- /dev/null
+++ b/dom/webidl/MessageEvent.webidl
@@ -0,0 +1,65 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://html.spec.whatwg.org/#messageevent
+ */
+
+[Exposed=(Window,Worker)]
+interface MessageEvent : Event {
+  constructor(DOMString type, optional MessageEventInit eventInitDict = {});
+
+  /**
+   * Custom data associated with this event.
+   */
+  [GetterThrows]
+  readonly attribute any data;
+
+  /**
+   * The origin of the site from which this event originated, which is the
+   * scheme, ":", and if the URI has a host, "//" followed by the
+   * host, and if the port is not the default for the given scheme,
+   * ":" followed by that port.  This value does not have a trailing slash.
+   */
+  readonly attribute USVString origin;
+
+  /**
+   * The last event ID string of the event source, for server-sent DOM events; this
+   * value is the empty string for cross-origin messaging.
+   */
+  readonly attribute DOMString lastEventId;
+
+  /**
+   * The window or port which originated this event.
+   */
+  readonly attribute MessageEventSource? source;
+
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<MessagePort> ports;
+
+  /**
+   * Initializes this event with the given data, in a manner analogous to
+   * the similarly-named method on the Event interface, also setting the
+   * data, origin, source, and lastEventId attributes of this appropriately.
+   */
+  undefined initMessageEvent(DOMString type,
+                             optional boolean bubbles = false,
+                             optional boolean cancelable = false,
+                             optional any data = null,
+                             optional DOMString origin = "",
+                             optional DOMString lastEventId = "",
+                             optional MessageEventSource? source = null,
+                             optional sequence<MessagePort> ports = []);
+};
+
+dictionary MessageEventInit : EventInit {
+  any data = null;
+  DOMString origin = "";
+  DOMString lastEventId = "";
+  MessageEventSource? source = null;
+  sequence<MessagePort> ports = [];
+};
+
+typedef (WindowProxy or MessagePort or ServiceWorker) MessageEventSource;
diff --git a/dom/webidl/MessagePort.webidl b/dom/webidl/MessagePort.webidl
new file mode 100644
index 0000000000..349bf8fbee
--- /dev/null
+++ b/dom/webidl/MessagePort.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://html.spec.whatwg.org/#message-ports
+ */
+
+[Exposed=(Window,Worker,AudioWorklet)]
+interface MessagePort : EventTarget {
+  [Throws]
+  undefined postMessage(any message, sequence<object> transferable);
+  [Throws]
+  undefined postMessage(any message, optional StructuredSerializeOptions options = {});
+
+  undefined start();
+  undefined close();
+
+  // event handlers
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+};
+
+// Used to declare which objects should be transferred.
+dictionary StructuredSerializeOptions {
+  sequence<object> transfer = [];
+};
diff --git a/dom/webidl/MimeType.webidl b/dom/webidl/MimeType.webidl
new file mode 100644
index 0000000000..86663bba12
--- /dev/null
+++ b/dom/webidl/MimeType.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface MimeType {
+  readonly attribute DOMString type;
+  readonly attribute DOMString description;
+  readonly attribute DOMString suffixes;
+  readonly attribute Plugin enabledPlugin;
+};
diff --git a/dom/webidl/MimeTypeArray.webidl b/dom/webidl/MimeTypeArray.webidl
new file mode 100644
index 0000000000..830753ce31
--- /dev/null
+++ b/dom/webidl/MimeTypeArray.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[LegacyUnenumerableNamedProperties,
+ Exposed=Window]
+interface MimeTypeArray {
+  readonly attribute unsigned long length;
+  getter MimeType? item(unsigned long index);
+  getter MimeType? namedItem(DOMString name);
+};
diff --git a/dom/webidl/MouseEvent.webidl b/dom/webidl/MouseEvent.webidl
new file mode 100644
index 0000000000..6053e6cec2
--- /dev/null
+++ b/dom/webidl/MouseEvent.webidl
@@ -0,0 +1,139 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ * https://drafts.csswg.org/cssom-view/#extensions-to-the-mouseevent-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface nsIScreen;
+
+[Exposed=Window]
+interface MouseEvent : UIEvent {
+  constructor(DOMString typeArg,
+              optional MouseEventInit mouseEventInitDict = {});
+
+  [NeedsCallerType]
+  readonly attribute long           screenX;
+  [NeedsCallerType]
+  readonly attribute long           screenY;
+
+  [ChromeOnly]
+  readonly attribute nsIScreen?     screen;
+
+  readonly attribute long           pageX;
+  readonly attribute long           pageY;
+  readonly attribute long           clientX;
+  readonly attribute long           clientY;
+  [BinaryName="clientX"]
+  readonly attribute long           x;
+  [BinaryName="clientY"]
+  readonly attribute long           y;
+  readonly attribute long           offsetX;
+  readonly attribute long           offsetY;
+  readonly attribute boolean        ctrlKey;
+  readonly attribute boolean        shiftKey;
+  readonly attribute boolean        altKey;
+  readonly attribute boolean        metaKey;
+  readonly attribute short          button;
+  readonly attribute unsigned short buttons;
+  readonly attribute EventTarget?   relatedTarget;
+  [Pref="dom.mouse_event.region.enabled"]
+  readonly attribute DOMString?     region;
+
+  // Pointer Lock
+  readonly attribute long           movementX;
+  readonly attribute long           movementY;
+
+  // Deprecated in DOM Level 3:
+undefined initMouseEvent(DOMString typeArg,
+                         optional boolean canBubbleArg = false,
+                         optional boolean cancelableArg = false,
+                         optional Window? viewArg = null,
+                         optional long detailArg = 0,
+                         optional long screenXArg = 0,
+                         optional long screenYArg = 0,
+                         optional long clientXArg = 0,
+                         optional long clientYArg = 0,
+                         optional boolean ctrlKeyArg = false,
+                         optional boolean altKeyArg = false,
+                         optional boolean shiftKeyArg = false,
+                         optional boolean metaKeyArg = false,
+                         optional short buttonArg = 0,
+                         optional EventTarget? relatedTargetArg = null);
+  // Introduced in DOM Level 3:
+  boolean                           getModifierState(DOMString keyArg);
+};
+
+// Suggested initMouseEvent replacement initializer:
+dictionary MouseEventInit : EventModifierInit {
+  // Attributes for MouseEvent:
+  long           screenX       = 0;
+  long           screenY       = 0;
+  long           clientX       = 0;
+  long           clientY       = 0;
+  short          button        = 0;
+  // Note: "buttons" was not previously initializable through initMouseEvent!
+  unsigned short buttons       = 0;
+  EventTarget?   relatedTarget = null;
+
+  // Pointer Lock
+  long           movementX = 0;
+  long           movementY = 0;
+};
+
+// Mozilla extensions
+partial interface MouseEvent
+{
+  // Finger or touch pressure event value
+  // ranges between 0.0 and 1.0
+  [Deprecated="MouseEvent_MozPressure"]
+  readonly attribute float mozPressure;
+
+  const unsigned short    MOZ_SOURCE_UNKNOWN    = 0;
+  const unsigned short    MOZ_SOURCE_MOUSE      = 1;
+  const unsigned short    MOZ_SOURCE_PEN        = 2;
+  const unsigned short    MOZ_SOURCE_ERASER     = 3;
+  const unsigned short    MOZ_SOURCE_CURSOR     = 4;
+  const unsigned short    MOZ_SOURCE_TOUCH      = 5;
+  const unsigned short    MOZ_SOURCE_KEYBOARD   = 6;
+
+  readonly attribute unsigned short mozInputSource;
+
+  undefined initNSMouseEvent(DOMString typeArg,
+                             optional boolean canBubbleArg = false,
+                             optional boolean cancelableArg = false,
+                             optional Window? viewArg = null,
+                             optional long detailArg = 0,
+                             optional long screenXArg = 0,
+                             optional long screenYArg = 0,
+                             optional long clientXArg = 0,
+                             optional long clientYArg = 0,
+                             optional boolean ctrlKeyArg = false,
+                             optional boolean altKeyArg = false,
+                             optional boolean shiftKeyArg = false,
+                             optional boolean metaKeyArg = false,
+                             optional short buttonArg = 0,
+                             optional EventTarget? relatedTargetArg = null,
+                             optional float pressure = 0,
+                             optional unsigned short inputSourceArg = 0);
+
+  /**
+   * preventClickEvent() prevents the following "click", "auxclick" and
+   * "dblclick" events of "mousedown" and "mouseup" events.
+   */
+  [ChromeOnly]
+  undefined preventClickEvent();
+
+  /**
+   * Returns true if the following "click", "auxclick" and "dblclick"
+   * events of "mousedown" and "mouseup" events are prevented.
+   */
+  [ChromeOnly]
+  boolean clickEventPrevented();
+};
diff --git a/dom/webidl/MouseScrollEvent.webidl b/dom/webidl/MouseScrollEvent.webidl
new file mode 100644
index 0000000000..8bc7af3a64
--- /dev/null
+++ b/dom/webidl/MouseScrollEvent.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface MouseScrollEvent : MouseEvent
+{
+  const long HORIZONTAL_AXIS = 1;
+  const long VERTICAL_AXIS = 2;
+
+  readonly attribute long axis;
+
+  undefined initMouseScrollEvent(DOMString type,
+                                 optional boolean canBubble = false,
+                                 optional boolean cancelable = false,
+                                 optional Window? view = null,
+                                 optional long detail = 0,
+                                 optional long screenX = 0,
+                                 optional long screenY = 0,
+                                 optional long clientX = 0,
+                                 optional long clientY = 0,
+                                 optional boolean ctrlKey = false,
+                                 optional boolean altKey = false,
+                                 optional boolean shiftKey = false,
+                                 optional boolean metaKey = false,
+                                 optional short button = 0,
+                                 optional EventTarget? relatedTarget = null,
+                                 optional long axis = 0);
+};
diff --git a/dom/webidl/MozApplicationEvent.webidl b/dom/webidl/MozApplicationEvent.webidl
new file mode 100644
index 0000000000..97a4cdd1f3
--- /dev/null
+++ b/dom/webidl/MozApplicationEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly,
+ Exposed=Window]
+interface MozApplicationEvent : Event
+{
+  constructor(DOMString type,
+              optional MozApplicationEventInit eventInitDict = {});
+
+  readonly attribute DOMApplication? application;
+};
+
+dictionary MozApplicationEventInit : EventInit
+{
+  DOMApplication? application = null;
+};
diff --git a/dom/webidl/MozFrameLoaderOwner.webidl b/dom/webidl/MozFrameLoaderOwner.webidl
new file mode 100644
index 0000000000..6caee18ee2
--- /dev/null
+++ b/dom/webidl/MozFrameLoaderOwner.webidl
@@ -0,0 +1,45 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary RemotenessOptions {
+  required UTF8String? remoteType;
+
+  // Used to resume a given channel load within the target process. If present,
+  // it will be used rather than the `src` & `srcdoc` attributes on the
+  // frameloader to control the load behaviour.
+  unsigned long long pendingSwitchID;
+
+  // True if we have an existing channel that we will resume in the
+  // target process, either via pendingSwitchID or using messageManager.
+  boolean switchingInProgressLoad = false;
+};
+
+/**
+ * A mixin included by elements that are 'browsing context containers'
+ * in HTML5 terms (that is, elements such as iframe that creates a new
+ * browsing context):
+ *
+ * https://html.spec.whatwg.org/#browsing-context-container
+ *
+ * Objects including this mixin must implement nsFrameLoaderOwner in
+ * native C++ code.
+ */
+interface mixin MozFrameLoaderOwner {
+  [ChromeOnly]
+  readonly attribute FrameLoader? frameLoader;
+
+  [ChromeOnly]
+  readonly attribute BrowsingContext? browsingContext;
+
+  [ChromeOnly, Throws]
+  undefined swapFrameLoaders(XULFrameElement aOtherLoaderOwner);
+
+  [ChromeOnly, Throws]
+  undefined swapFrameLoaders(HTMLIFrameElement aOtherLoaderOwner);
+
+  [ChromeOnly, Throws]
+  undefined changeRemoteness(RemotenessOptions aOptions);
+};
diff --git a/dom/webidl/MutationEvent.webidl b/dom/webidl/MutationEvent.webidl
new file mode 100644
index 0000000000..1fca8d1c07
--- /dev/null
+++ b/dom/webidl/MutationEvent.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+[Exposed=Window]
+interface MutationEvent : Event
+{
+  const unsigned short MODIFICATION = 1;
+  const unsigned short ADDITION     = 2;
+  const unsigned short REMOVAL      = 3;
+  [ChromeOnly]
+  const unsigned short SMIL         = 4;
+
+  readonly attribute Node?          relatedNode;
+  readonly attribute DOMString      prevValue;
+  readonly attribute DOMString      newValue;
+  readonly attribute DOMString      attrName;
+  readonly attribute unsigned short attrChange;
+
+  [Throws]
+  undefined initMutationEvent(DOMString type,
+                              optional boolean canBubble = false,
+                              optional boolean cancelable = false,
+                              optional Node? relatedNode = null,
+                              optional DOMString prevValue = "",
+                              optional DOMString newValue = "",
+                              optional DOMString attrName = "",
+                              optional unsigned short attrChange = 0);
+};
diff --git a/dom/webidl/MutationObserver.webidl b/dom/webidl/MutationObserver.webidl
new file mode 100644
index 0000000000..ae43e1b48a
--- /dev/null
+++ b/dom/webidl/MutationObserver.webidl
@@ -0,0 +1,78 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org
+ */
+
+[ProbablyShortLivingWrapper,
+ Exposed=Window]
+interface MutationRecord {
+  [Constant]
+  readonly attribute DOMString type;
+  // .target is not nullable per the spec, but in order to prevent crashes,
+  // if there are GC/CC bugs in Gecko, we let the property to be null.
+  [Constant]
+  readonly attribute Node? target;
+  [Constant]
+  readonly attribute NodeList addedNodes;
+  [Constant]
+  readonly attribute NodeList removedNodes;
+  [Constant]
+  readonly attribute Node? previousSibling;
+  [Constant]
+  readonly attribute Node? nextSibling;
+  [Constant]
+  readonly attribute DOMString? attributeName;
+  [Constant]
+  readonly attribute DOMString? attributeNamespace;
+  [Constant]
+  readonly attribute DOMString? oldValue;
+  [Constant, Cached, ChromeOnly]
+  readonly attribute sequence<Animation> addedAnimations;
+  [Constant, Cached, ChromeOnly]
+  readonly attribute sequence<Animation> changedAnimations;
+  [Constant, Cached, ChromeOnly]
+  readonly attribute sequence<Animation> removedAnimations;
+};
+
+[Exposed=Window]
+interface MutationObserver {
+  [Throws]
+  constructor(MutationCallback mutationCallback);
+
+  [Throws, NeedsSubjectPrincipal]
+  undefined observe(Node target, optional MutationObserverInit options = {});
+  undefined disconnect();
+  sequence<MutationRecord> takeRecords();
+
+  [ChromeOnly, Throws]
+  sequence<MutationObservingInfo?> getObservingInfo();
+  [ChromeOnly]
+  readonly attribute MutationCallback mutationCallback;
+  [ChromeOnly]
+  attribute boolean mergeAttributeRecords;
+};
+
+callback MutationCallback = undefined (sequence<MutationRecord> mutations, MutationObserver observer);
+
+dictionary MutationObserverInit {
+  boolean childList = false;
+  boolean attributes;
+  boolean characterData;
+  boolean subtree = false;
+  boolean attributeOldValue;
+  boolean characterDataOldValue;
+  [ChromeOnly]
+  boolean chromeOnlyNodes = false;
+  [ChromeOnly]
+  boolean animations = false;
+  sequence<DOMString> attributeFilter;
+};
+
+dictionary MutationObservingInfo : MutationObserverInit
+{
+  Node? observedNode = null;
+};
diff --git a/dom/webidl/NamedNodeMap.webidl b/dom/webidl/NamedNodeMap.webidl
new file mode 100644
index 0000000000..2f0b649f59
--- /dev/null
+++ b/dom/webidl/NamedNodeMap.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[LegacyUnenumerableNamedProperties,
+ Exposed=Window]
+interface NamedNodeMap {
+  getter Attr? getNamedItem(DOMString name);
+  [CEReactions, Throws, BinaryName="setNamedItemNS"]
+  Attr? setNamedItem(Attr arg);
+  [CEReactions, Throws]
+  Attr removeNamedItem(DOMString name);
+
+  getter Attr? item(unsigned long index);
+  readonly attribute unsigned long length;
+
+  Attr? getNamedItemNS(DOMString? namespaceURI, DOMString localName);
+  [CEReactions, Throws]
+  Attr? setNamedItemNS(Attr arg);
+  [CEReactions, Throws]
+  Attr removeNamedItemNS(DOMString? namespaceURI, DOMString localName);
+};
diff --git a/dom/webidl/NavigationPreloadManager.webidl b/dom/webidl/NavigationPreloadManager.webidl
new file mode 100644
index 0000000000..f1715d3c8f
--- /dev/null
+++ b/dom/webidl/NavigationPreloadManager.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/ServiceWorker/#navigation-preload-manager
+ */
+
+[Func="NavigationPreloadManager::IsEnabled", SecureContext,
+ Exposed=(Window,Worker)]
+interface NavigationPreloadManager {
+  [NewObject]
+  Promise<undefined> enable();
+  [NewObject]
+  Promise<undefined> disable();
+  [NewObject]
+  Promise<undefined> setHeaderValue(ByteString value);
+  [NewObject]
+  Promise<NavigationPreloadState> getState();
+};
+
+dictionary NavigationPreloadState {
+  boolean enabled = false;
+  ByteString headerValue;
+};
diff --git a/dom/webidl/Navigator.webidl b/dom/webidl/Navigator.webidl
new file mode 100644
index 0000000000..56cf1c0f45
--- /dev/null
+++ b/dom/webidl/Navigator.webidl
@@ -0,0 +1,371 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-navigator-object
+ * http://www.w3.org/TR/tracking-dnt/
+ * http://www.w3.org/TR/geolocation-API/#geolocation_interface
+ * http://www.w3.org/TR/battery-status/#navigatorbattery-interface
+ * http://www.w3.org/TR/vibration/#vibration-interface
+ * http://www.w3.org/2012/sysapps/runtime/#extension-to-the-navigator-interface-1
+ * https://dvcs.w3.org/hg/gamepad/raw-file/default/gamepad.html#navigator-interface-extension
+ * http://www.w3.org/TR/beacon/#sec-beacon-method
+ * https://html.spec.whatwg.org/#navigatorconcurrenthardware
+ * http://wicg.github.io/netinfo/#extensions-to-the-navigator-interface
+ * https://w3c.github.io/webappsec-credential-management/#framework-credential-management
+ * https://w3c.github.io/webdriver/webdriver-spec.html#interface
+ * https://wicg.github.io/media-capabilities/#idl-index
+ * https://w3c.github.io/mediasession/#idl-index
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface URI;
+
+// http://www.whatwg.org/specs/web-apps/current-work/#the-navigator-object
+[HeaderFile="Navigator.h",
+ Exposed=Window]
+interface Navigator {
+  // objects implementing this interface also implement the interfaces given below
+};
+Navigator includes NavigatorID;
+Navigator includes NavigatorLanguage;
+Navigator includes NavigatorOnLine;
+Navigator includes NavigatorContentUtils;
+Navigator includes NavigatorStorageUtils;
+Navigator includes NavigatorConcurrentHardware;
+Navigator includes NavigatorStorage;
+Navigator includes NavigatorAutomationInformation;
+Navigator includes GPUProvider;
+Navigator includes GlobalPrivacyControl;
+
+interface mixin NavigatorID {
+  // WebKit/Blink/Trident/Presto support this (hardcoded "Mozilla").
+  [Constant, Cached, Throws]
+  readonly attribute DOMString appCodeName; // constant "Mozilla"
+  [Constant, Cached, NeedsCallerType]
+  readonly attribute DOMString appName;
+  [Constant, Cached, Throws, NeedsCallerType]
+  readonly attribute DOMString appVersion;
+  [Pure, Cached, Throws, NeedsCallerType]
+  readonly attribute DOMString platform;
+  [Pure, Cached, Throws, NeedsCallerType]
+  readonly attribute DOMString userAgent;
+  [Constant, Cached]
+  readonly attribute DOMString product; // constant "Gecko"
+
+  // Everyone but WebKit/Blink supports this.  See bug 679971.
+  [Exposed=Window]
+  boolean taintEnabled(); // constant false
+};
+
+interface mixin NavigatorLanguage {
+
+  // These two attributes are cached because this interface is also implemented
+  // by Workernavigator and this way we don't have to go back to the
+  // main-thread from the worker thread anytime we need to retrieve them. They
+  // are updated when pref intl.accept_languages is changed.
+
+  [Pure, Cached]
+  readonly attribute DOMString? language;
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<DOMString> languages;
+};
+
+interface mixin NavigatorOnLine {
+  readonly attribute boolean onLine;
+};
+
+interface mixin NavigatorContentUtils {
+  // content handler registration
+  [Throws, ChromeOnly]
+  undefined checkProtocolHandlerAllowed(DOMString scheme, URI handlerURI, URI documentURI);
+  [Throws, SecureContext]
+  undefined registerProtocolHandler(DOMString scheme, DOMString url);
+  // NOT IMPLEMENTED
+  //undefined unregisterProtocolHandler(DOMString scheme, DOMString url);
+};
+
+[SecureContext]
+interface mixin NavigatorStorage {
+  [Pref="dom.storageManager.enabled"]
+  readonly attribute StorageManager storage;
+};
+
+interface mixin NavigatorStorageUtils {
+  // NOT IMPLEMENTED
+  //undefined yieldForStorageUpdates();
+};
+
+partial interface Navigator {
+  [Throws]
+  readonly attribute Permissions permissions;
+};
+
+partial interface Navigator {
+  [Throws, SameObject]
+  readonly attribute MimeTypeArray mimeTypes;
+  [Throws, SameObject]
+  readonly attribute PluginArray plugins;
+  readonly attribute boolean pdfViewerEnabled;
+};
+
+// http://www.w3.org/TR/tracking-dnt/ sort of
+partial interface Navigator {
+  readonly attribute DOMString doNotTrack;
+};
+
+// https://globalprivacycontrol.github.io/gpc-spec/
+interface mixin GlobalPrivacyControl {
+  [Pref="privacy.globalprivacycontrol.functionality.enabled"]
+  readonly attribute boolean globalPrivacyControl;
+};
+
+// http://www.w3.org/TR/geolocation-API/#geolocation_interface
+interface mixin NavigatorGeolocation {
+  [Throws, Pref="geo.enabled"]
+  readonly attribute Geolocation geolocation;
+};
+Navigator includes NavigatorGeolocation;
+
+// http://www.w3.org/TR/battery-status/#navigatorbattery-interface
+partial interface Navigator {
+  // ChromeOnly to prevent web content from fingerprinting users' batteries.
+  [Throws, ChromeOnly, Pref="dom.battery.enabled"]
+  Promise<BatteryManager> getBattery();
+};
+
+// http://www.w3.org/TR/vibration/#vibration-interface
+partial interface Navigator {
+    // We don't support sequences in unions yet
+    //boolean vibrate ((unsigned long or sequence<unsigned long>) pattern);
+    boolean vibrate(unsigned long duration);
+    boolean vibrate(sequence<unsigned long> pattern);
+};
+
+// http://www.w3.org/TR/pointerevents/#extensions-to-the-navigator-interface
+partial interface Navigator {
+    [NeedsCallerType]
+    readonly attribute long maxTouchPoints;
+};
+
+// https://wicg.github.io/media-capabilities/#idl-index
+[Exposed=Window]
+partial interface Navigator {
+  [SameObject, Func="mozilla::dom::MediaCapabilities::Enabled"]
+  readonly attribute MediaCapabilities mediaCapabilities;
+};
+
+// Mozilla-specific extensions
+
+// Chrome-only interface for Vibration API permission handling.
+partial interface Navigator {
+    /* Set permission state to device vibration.
+     * @param permitted permission state (true for allowing vibration)
+     * @param persistent make the permission session-persistent
+     */
+    [ChromeOnly]
+    undefined setVibrationPermission(boolean permitted,
+                                     optional boolean persistent = true);
+};
+
+partial interface Navigator {
+  [Throws, Constant, Cached, NeedsCallerType]
+  readonly attribute DOMString oscpu;
+  // WebKit/Blink support this; Trident/Presto do not.
+  readonly attribute DOMString vendor;
+  // WebKit/Blink supports this (hardcoded ""); Trident/Presto do not.
+  readonly attribute DOMString vendorSub;
+  // WebKit/Blink supports this (hardcoded "20030107"); Trident/Presto don't
+  readonly attribute DOMString productSub;
+  // WebKit/Blink/Trident/Presto support this.
+  readonly attribute boolean cookieEnabled;
+  [Throws, Constant, Cached, NeedsCallerType]
+  readonly attribute DOMString buildID;
+
+  // WebKit/Blink/Trident/Presto support this.
+  [Affects=Nothing, DependsOn=Nothing]
+  boolean javaEnabled();
+};
+
+// Addon manager bits
+partial interface Navigator {
+  [Throws, Func="mozilla::AddonManagerWebAPI::IsAPIEnabled"]
+  readonly attribute AddonManager mozAddonManager;
+};
+
+// NetworkInformation
+partial interface Navigator {
+  [Throws, Pref="dom.netinfo.enabled"]
+  readonly attribute NetworkInformation connection;
+};
+
+// https://dvcs.w3.org/hg/gamepad/raw-file/default/gamepad.html#navigator-interface-extension
+partial interface Navigator {
+  [Throws, Pref="dom.gamepad.enabled", SecureContext]
+  sequence<Gamepad?> getGamepads();
+};
+partial interface Navigator {
+  [Throws, Pref="dom.gamepad.test.enabled"]
+  GamepadServiceTest requestGamepadServiceTest();
+};
+
+// https://immersive-web.github.io/webvr/spec/1.1/#interface-navigator
+partial interface Navigator {
+  [NewObject, SecureContext, Pref="dom.vr.enabled"]
+  Promise<sequence<VRDisplay>> getVRDisplays();
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  [SecureContext, Frozen, Cached, Pure, Pref="dom.vr.enabled"]
+  readonly attribute sequence<VRDisplay> activeVRDisplays;
+  [ChromeOnly, Pref="dom.vr.enabled"]
+  readonly attribute boolean isWebVRContentDetected;
+  [ChromeOnly, Pref="dom.vr.enabled"]
+  readonly attribute boolean isWebVRContentPresenting;
+  [ChromeOnly, Pref="dom.vr.enabled"]
+  undefined requestVRPresentation(VRDisplay display);
+};
+partial interface Navigator {
+  [Throws, Pref="dom.vr.puppet.enabled"]
+  VRServiceTest requestVRServiceTest();
+};
+
+// https://immersive-web.github.io/webxr/#dom-navigator-xr
+partial interface Navigator {
+  [SecureContext, SameObject, Throws, Pref="dom.vr.webxr.enabled"]
+  readonly attribute XRSystem xr;
+};
+
+// http://webaudio.github.io/web-midi-api/#requestmidiaccess
+partial interface Navigator {
+  [NewObject, Func="Navigator::HasMidiSupport"]
+  Promise<MIDIAccess> requestMIDIAccess(optional MIDIOptions options = {});
+};
+
+callback NavigatorUserMediaSuccessCallback = undefined (MediaStream stream);
+callback NavigatorUserMediaErrorCallback = undefined (MediaStreamError error);
+
+partial interface Navigator {
+  [Throws, Func="Navigator::HasUserMediaSupport"]
+  readonly attribute MediaDevices mediaDevices;
+
+  // Deprecated. Use mediaDevices.getUserMedia instead.
+  [Deprecated="NavigatorGetUserMedia", Throws,
+   Func="Navigator::HasUserMediaSupport",
+   NeedsCallerType,
+   UseCounter]
+  undefined mozGetUserMedia(MediaStreamConstraints constraints,
+                            NavigatorUserMediaSuccessCallback successCallback,
+                            NavigatorUserMediaErrorCallback errorCallback);
+};
+
+// Service Workers/Navigation Controllers
+partial interface Navigator {
+  [Func="ServiceWorkersEnabled", SameObject, BinaryName="serviceWorkerJS"]
+  readonly attribute ServiceWorkerContainer serviceWorker;
+};
+
+partial interface Navigator {
+  [Throws, Pref="beacon.enabled"]
+  boolean sendBeacon(DOMString url,
+                     optional BodyInit? data = null);
+};
+
+partial interface Navigator {
+  [NewObject, Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist"]
+  readonly attribute LegacyMozTCPSocket mozTCPSocket;
+};
+
+partial interface Navigator {
+  [NewObject]
+  Promise<MediaKeySystemAccess>
+  requestMediaKeySystemAccess(DOMString keySystem,
+                              sequence<MediaKeySystemConfiguration> supportedConfigurations);
+};
+
+interface mixin NavigatorConcurrentHardware {
+  readonly attribute unsigned long long hardwareConcurrency;
+};
+
+// https://w3c.github.io/webappsec-credential-management/#framework-credential-management
+partial interface Navigator {
+  [Pref="security.webauth.webauthn", SecureContext, SameObject]
+  readonly attribute CredentialsContainer credentials;
+};
+
+// https://w3c.github.io/webdriver/webdriver-spec.html#interface
+interface mixin NavigatorAutomationInformation {
+  [Constant, Cached]
+  readonly attribute boolean webdriver;
+};
+
+// https://www.w3.org/TR/clipboard-apis/#navigator-interface
+partial interface Navigator {
+  [SecureContext, SameObject]
+  readonly attribute Clipboard clipboard;
+};
+
+// Used for testing of origin trials.
+partial interface Navigator {
+  [Trial="TestTrial"]
+  readonly attribute boolean testTrialGatedAttribute;
+};
+
+// https://wicg.github.io/web-share/#navigator-interface
+partial interface Navigator {
+  [SecureContext, NewObject, Func="Navigator::HasShareSupport"]
+  Promise<undefined> share(optional ShareData data = {});
+  [SecureContext, Func="Navigator::HasShareSupport"]
+  boolean canShare(optional ShareData data = {});
+};
+// https://wicg.github.io/web-share/#sharedata-dictionary
+dictionary ShareData {
+  USVString title;
+  USVString text;
+  USVString url;
+  // Note: we don't actually support files yet
+  // we have it here for the .canShare() checks.
+  sequence<File> files;
+};
+
+// https://w3c.github.io/mediasession/#idl-index
+[Exposed=Window]
+partial interface Navigator {
+  [Pref="dom.media.mediasession.enabled", SameObject]
+  readonly attribute MediaSession mediaSession;
+};
+
+// https://wicg.github.io/web-locks/#navigator-mixins
+[SecureContext]
+interface mixin NavigatorLocks {
+  [Pref="dom.weblocks.enabled"]
+  readonly attribute LockManager locks;
+};
+Navigator includes NavigatorLocks;
+
+// https://w3c.github.io/autoplay/#autoplay-policy
+enum AutoplayPolicy {
+  "allowed",
+  "allowed-muted",
+  "disallowed"
+};
+
+enum AutoplayPolicyMediaType {
+  "mediaelement",
+  "audiocontext"
+};
+
+// https://w3c.github.io/autoplay/#autoplay-detection-methods
+partial interface Navigator {
+  [Pref="dom.media.autoplay-policy-detection.enabled"]
+  AutoplayPolicy getAutoplayPolicy(AutoplayPolicyMediaType type);
+
+  [Pref="dom.media.autoplay-policy-detection.enabled"]
+  AutoplayPolicy getAutoplayPolicy(HTMLMediaElement element);
+
+  [Pref="dom.media.autoplay-policy-detection.enabled"]
+  AutoplayPolicy getAutoplayPolicy(AudioContext context);
+};
diff --git a/dom/webidl/NetErrorInfo.webidl b/dom/webidl/NetErrorInfo.webidl
new file mode 100644
index 0000000000..46f5fa64d6
--- /dev/null
+++ b/dom/webidl/NetErrorInfo.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * This dictionary is used for exposing failed channel info
+ * to about:neterror to built UI.
+ */
+
+dictionary NetErrorInfo {
+  DOMString errorCodeString = "";
+};
diff --git a/dom/webidl/NetworkInformation.webidl b/dom/webidl/NetworkInformation.webidl
new file mode 100644
index 0000000000..2020044d2e
--- /dev/null
+++ b/dom/webidl/NetworkInformation.webidl
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is https://w3c.github.io/netinfo/
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum ConnectionType {
+    "cellular",
+    "bluetooth",
+    "ethernet",
+    "wifi",
+    "other",
+    "none",
+    "unknown"
+};
+
+[Pref="dom.netinfo.enabled",
+ Exposed=(Window,Worker)]
+interface NetworkInformation : EventTarget {
+    readonly    attribute ConnectionType type;
+                attribute EventHandler   ontypechange;
+};
diff --git a/dom/webidl/NetworkOptions.webidl b/dom/webidl/NetworkOptions.webidl
new file mode 100644
index 0000000000..b313c932dd
--- /dev/null
+++ b/dom/webidl/NetworkOptions.webidl
@@ -0,0 +1,109 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+* This dictionary holds the parameters sent to the network worker.
+*/
+dictionary NetworkCommandOptions
+{
+  long id = 0;                        // opaque id.
+  DOMString cmd = "";                 // the command name.
+  DOMString ifname;                   // for "removeNetworkRoute", "setDNS",
+                                      //     "setDefaultRouteAndDNS", "removeDefaultRoute"
+                                      //     "addHostRoute", "removeHostRoute"
+                                      //     "removeHostRoutes".
+  DOMString ip;                       // for "removeNetworkRoute", "setWifiTethering".
+  unsigned long prefixLength;         // for "removeNetworkRoute".
+  DOMString domain;                   // for "setDNS"
+  sequence<DOMString> dnses;          // for "setDNS", "setDefaultRouteAndDNS".
+  DOMString gateway;                  // for "addSecondaryRoute", "removeSecondaryRoute".
+  sequence<DOMString> gateways;       // for "setDefaultRouteAndDNS", "removeDefaultRoute".
+  DOMString mode;                     // for "setWifiOperationMode".
+  boolean report;                     // for "setWifiOperationMode".
+  boolean enabled;                    // for "setDhcpServer".
+  DOMString wifictrlinterfacename;    // for "setWifiTethering".
+  DOMString internalIfname;           // for "setWifiTethering".
+  DOMString externalIfname;           // for "setWifiTethering".
+  boolean enable;                     // for "setWifiTethering".
+  DOMString ssid;                     // for "setWifiTethering".
+  DOMString security;                 // for "setWifiTethering".
+  DOMString key;                      // for "setWifiTethering".
+  DOMString prefix;                   // for "setWifiTethering", "setDhcpServer".
+  DOMString link;                     // for "setWifiTethering", "setDhcpServer".
+  sequence<DOMString> interfaceList;  // for "setWifiTethering".
+  DOMString wifiStartIp;              // for "setWifiTethering".
+  DOMString wifiEndIp;                // for "setWifiTethering".
+  DOMString usbStartIp;               // for "setWifiTethering".
+  DOMString usbEndIp;                 // for "setWifiTethering".
+  DOMString dns1;                     // for "setWifiTethering".
+  DOMString dns2;                     // for "setWifiTethering".
+  long long threshold;                // for "setNetworkInterfaceAlarm",
+                                      //     "enableNetworkInterfaceAlarm".
+  DOMString startIp;                  // for "setDhcpServer".
+  DOMString endIp;                    // for "setDhcpServer".
+  DOMString serverIp;                 // for "setDhcpServer".
+  DOMString maskLength;               // for "setDhcpServer".
+  DOMString preInternalIfname;        // for "updateUpStream".
+  DOMString preExternalIfname;        // for "updateUpStream".
+  DOMString curInternalIfname;        // for "updateUpStream".
+  DOMString curExternalIfname;        // for "updateUpStream".
+
+  long ipaddr;                        // for "ifc_configure".
+  long mask;                          // for "ifc_configure".
+  long gateway_long;                  // for "ifc_configure".
+  long dns1_long;                     // for "ifc_configure".
+  long dns2_long;                     // for "ifc_configure".
+
+  long mtu;                           // for "setMtu".
+};
+
+/**
+* This dictionary holds the parameters sent back to NetworkService.js.
+*/
+dictionary NetworkResultOptions
+{
+  long id = 0;                        // opaque id.
+  boolean ret = false;                // for sync command.
+  boolean broadcast = false;          // for netd broadcast message.
+  DOMString topic = "";               // for netd broadcast message.
+  DOMString reason = "";              // for netd broadcast message.
+
+  long resultCode = 0;                // for all commands.
+  DOMString resultReason = "";        // for all commands.
+  boolean error = false;              // for all commands.
+
+  boolean enable = false;             // for "setWifiTethering", "setUSBTethering"
+                                      //     "enableUsbRndis".
+  boolean result = false;             // for "enableUsbRndis".
+  boolean success = false;            // for "setDhcpServer".
+  DOMString curExternalIfname = "";   // for "updateUpStream".
+  DOMString curInternalIfname = "";   // for "updateUpStream".
+
+  DOMString reply = "";               // for "command".
+  DOMString route = "";               // for "ifc_get_default_route".
+  DOMString ipaddr_str = "";          // The following are for the result of
+                                      // dhcp_do_request.
+  DOMString gateway_str = "";
+  DOMString dns1_str = "";
+  DOMString dns2_str = "";
+  DOMString mask_str = "";
+  DOMString server_str = "";
+  DOMString vendor_str = "";
+  long      lease = 0;
+  long      prefixLength = 0;
+  long      mask = 0;
+  long      ipaddr = 0;
+  long      gateway = 0;
+  long      dns1 = 0;
+  long      dns2 = 0;
+  long      server = 0;
+
+  DOMString netId = "";               // for "getNetId".
+
+  sequence<DOMString> interfaceList;  // for "getInterfaceList".
+
+  DOMString flag = "down";            // for "getInterfaceConfig".
+  DOMString macAddr = "";             // for "getInterfaceConfig".
+  DOMString ipAddr = "";              // for "getInterfaceConfig".
+};
diff --git a/dom/webidl/Node.webidl b/dom/webidl/Node.webidl
new file mode 100644
index 0000000000..f0604d406e
--- /dev/null
+++ b/dom/webidl/Node.webidl
@@ -0,0 +1,139 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface Principal;
+interface URI;
+
+[Exposed=Window]
+interface Node : EventTarget {
+  const unsigned short ELEMENT_NODE = 1;
+  const unsigned short ATTRIBUTE_NODE = 2; // historical
+  const unsigned short TEXT_NODE = 3;
+  const unsigned short CDATA_SECTION_NODE = 4; // historical
+  const unsigned short ENTITY_REFERENCE_NODE = 5; // historical
+  const unsigned short ENTITY_NODE = 6; // historical
+  const unsigned short PROCESSING_INSTRUCTION_NODE = 7;
+  const unsigned short COMMENT_NODE = 8;
+  const unsigned short DOCUMENT_NODE = 9;
+  const unsigned short DOCUMENT_TYPE_NODE = 10;
+  const unsigned short DOCUMENT_FRAGMENT_NODE = 11;
+  const unsigned short NOTATION_NODE = 12; // historical
+  [Constant]
+  readonly attribute unsigned short nodeType;
+  [Pure]
+  readonly attribute DOMString nodeName;
+
+  [Pure, Throws, NeedsCallerType, BinaryName="baseURIFromJS"]
+  readonly attribute DOMString? baseURI;
+
+  [Pure, BinaryName=isInComposedDoc]
+  readonly attribute boolean isConnected;
+  [Pure]
+  readonly attribute Document? ownerDocument;
+  [Pure]
+  Node getRootNode(optional GetRootNodeOptions options = {});
+  [Pure]
+  readonly attribute Node? parentNode;
+  [Pure]
+  readonly attribute Element? parentElement;
+  [Pure]
+  boolean hasChildNodes();
+  [SameObject]
+  readonly attribute NodeList childNodes;
+  [Pure]
+  readonly attribute Node? firstChild;
+  [Pure]
+  readonly attribute Node? lastChild;
+  [Pure]
+  readonly attribute Node? previousSibling;
+  [Pure]
+  readonly attribute Node? nextSibling;
+
+  [CEReactions, SetterThrows, Pure]
+           attribute DOMString? nodeValue;
+  [CEReactions, SetterThrows, GetterCanOOM,
+   SetterNeedsSubjectPrincipal=NonSystem, Pure]
+           attribute DOMString? textContent;
+  // These DOM methods cannot be accessed by UA Widget scripts
+  // because the DOM element reflectors will be in the content scope,
+  // instead of the desired UA Widget scope.
+  [CEReactions, Throws, Func="IsNotUAWidget"]
+  Node insertBefore(Node node, Node? child);
+  [CEReactions, Throws, Func="IsNotUAWidget"]
+  Node appendChild(Node node);
+  [CEReactions, Throws, Func="IsNotUAWidget"]
+  Node replaceChild(Node node, Node child);
+  [CEReactions, Throws]
+  Node removeChild(Node child);
+  [CEReactions]
+  undefined normalize();
+
+  [CEReactions, Throws, Func="IsNotUAWidget"]
+  Node cloneNode(optional boolean deep = false);
+  [Pure]
+  boolean isSameNode(Node? node);
+  [Pure]
+  boolean isEqualNode(Node? node);
+
+  const unsigned short DOCUMENT_POSITION_DISCONNECTED = 0x01;
+  const unsigned short DOCUMENT_POSITION_PRECEDING = 0x02;
+  const unsigned short DOCUMENT_POSITION_FOLLOWING = 0x04;
+  const unsigned short DOCUMENT_POSITION_CONTAINS = 0x08;
+  const unsigned short DOCUMENT_POSITION_CONTAINED_BY = 0x10;
+  const unsigned short DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20; // historical
+  [Pure]
+  unsigned short compareDocumentPosition(Node other);
+  [Pure]
+  boolean contains(Node? other);
+
+  [Pure]
+  DOMString? lookupPrefix(DOMString? namespace);
+  [Pure]
+  DOMString? lookupNamespaceURI(DOMString? prefix);
+  [Pure]
+  boolean isDefaultNamespace(DOMString? namespace);
+
+  // Mozilla-specific stuff
+  [ChromeOnly]
+  readonly attribute Principal nodePrincipal;
+  [ChromeOnly]
+  readonly attribute URI? baseURIObject;
+  [ChromeOnly]
+  DOMString generateXPath();
+  [ChromeOnly, Pure, BinaryName="flattenedTreeParentNodeNonInline"]
+  readonly attribute Node? flattenedTreeParentNode;
+  [ChromeOnly, Pure, BinaryName="isInNativeAnonymousSubtree"]
+  readonly attribute boolean isNativeAnonymous;
+
+  // Maybe this would be useful to authors? https://github.com/whatwg/dom/issues/826
+  [Func="IsChromeOrUAWidget", Pure, BinaryName="containingShadow"]
+  readonly attribute ShadowRoot? containingShadowRoot;
+
+  // Mozilla devtools-specific stuff
+  /**
+   * If this element is a flex item (or has one or more anonymous box ancestors
+   * that chain up to an anonymous flex item), then this method returns the
+   * flex container that the flex item participates in. Otherwise, this method
+   * returns null.
+   */
+  [ChromeOnly]
+  readonly attribute Element? parentFlexElement;
+
+#ifdef ACCESSIBILITY
+  [Func="mozilla::dom::AccessibleNode::IsAOMEnabled", SameObject]
+  readonly attribute AccessibleNode? accessibleNode;
+#endif
+};
+
+dictionary GetRootNodeOptions {
+  boolean composed = false;
+};
diff --git a/dom/webidl/NodeFilter.webidl b/dom/webidl/NodeFilter.webidl
new file mode 100644
index 0000000000..b2f3207286
--- /dev/null
+++ b/dom/webidl/NodeFilter.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#interface-nodefilter
+ */
+
+[Exposed=Window]
+callback interface NodeFilter {
+  // Constants for acceptNode()
+  const unsigned short FILTER_ACCEPT = 1;
+  const unsigned short FILTER_REJECT = 2;
+  const unsigned short FILTER_SKIP = 3;
+
+  // Constants for whatToShow
+  const unsigned long SHOW_ALL = 0xFFFFFFFF;
+  const unsigned long SHOW_ELEMENT = 0x1;
+  const unsigned long SHOW_ATTRIBUTE = 0x2; // historical
+  const unsigned long SHOW_TEXT = 0x4;
+  const unsigned long SHOW_CDATA_SECTION = 0x8; // historical
+  const unsigned long SHOW_ENTITY_REFERENCE = 0x10; // historical
+  const unsigned long SHOW_ENTITY = 0x20; // historical
+  const unsigned long SHOW_PROCESSING_INSTRUCTION = 0x40;
+  const unsigned long SHOW_COMMENT = 0x80;
+  const unsigned long SHOW_DOCUMENT = 0x100;
+  const unsigned long SHOW_DOCUMENT_TYPE = 0x200;
+  const unsigned long SHOW_DOCUMENT_FRAGMENT = 0x400;
+  const unsigned long SHOW_NOTATION = 0x800; // historical
+
+  unsigned short acceptNode(Node node);
+};
diff --git a/dom/webidl/NodeIterator.webidl b/dom/webidl/NodeIterator.webidl
new file mode 100644
index 0000000000..f9cc89c795
--- /dev/null
+++ b/dom/webidl/NodeIterator.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface NodeIterator {
+  [Constant]
+  readonly attribute Node root;
+  [Pure]
+  readonly attribute Node? referenceNode;
+  [Pure]
+  readonly attribute boolean pointerBeforeReferenceNode;
+  [Constant]
+  readonly attribute unsigned long whatToShow;
+  [Constant]
+  readonly attribute NodeFilter? filter;
+
+  [Throws]
+  Node? nextNode();
+  [Throws]
+  Node? previousNode();
+
+  undefined detach();
+};
diff --git a/dom/webidl/NodeList.webidl b/dom/webidl/NodeList.webidl
new file mode 100644
index 0000000000..c881665de2
--- /dev/null
+++ b/dom/webidl/NodeList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[ProbablyShortLivingWrapper,
+ Exposed=Window]
+interface NodeList {
+  getter Node? item(unsigned long index);
+  readonly attribute unsigned long length;
+  iterable<Node?>;
+};
diff --git a/dom/webidl/Notification.webidl b/dom/webidl/Notification.webidl
new file mode 100644
index 0000000000..8c96a81713
--- /dev/null
+++ b/dom/webidl/Notification.webidl
@@ -0,0 +1,107 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://notifications.spec.whatwg.org/
+ *
+ * Copyright:
+ * To the extent possible under law, the editors have waived all copyright and
+ * related or neighboring rights to this work.
+ */
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::Notification::PrefEnabled"]
+interface Notification : EventTarget {
+  [Throws]
+  constructor(DOMString title, optional NotificationOptions options = {});
+
+  [GetterThrows]
+  static readonly attribute NotificationPermission permission;
+
+  [NewObject, Func="mozilla::dom::Notification::RequestPermissionEnabledForScope"]
+  static Promise<NotificationPermission> requestPermission(optional NotificationPermissionCallback permissionCallback);
+
+  attribute EventHandler onclick;
+
+  attribute EventHandler onshow;
+
+  attribute EventHandler onerror;
+
+  attribute EventHandler onclose;
+
+  [Pure]
+  readonly attribute DOMString title;
+
+  [Pure]
+  readonly attribute NotificationDirection dir;
+
+  [Pure]
+  readonly attribute DOMString? lang;
+
+  [Pure]
+  readonly attribute DOMString? body;
+
+  [Constant]
+  readonly attribute DOMString? tag;
+
+  [Pure]
+  readonly attribute DOMString? icon;
+
+  [Constant, Pref="dom.webnotifications.requireinteraction.enabled"]
+  readonly attribute boolean requireInteraction;
+
+  [Constant, Pref="dom.webnotifications.silent.enabled"]
+  readonly attribute boolean silent;
+
+  [Cached, Frozen, Pure, Pref="dom.webnotifications.vibrate.enabled"]
+  readonly attribute sequence<unsigned long> vibrate;
+
+  [Constant]
+  readonly attribute any data;
+
+  undefined close();
+};
+
+typedef (unsigned long or sequence<unsigned long>) VibratePattern;
+
+dictionary NotificationOptions {
+  NotificationDirection dir = "auto";
+  DOMString lang = "";
+  DOMString body = "";
+  DOMString tag = "";
+  DOMString icon = "";
+  boolean requireInteraction = false;
+  boolean silent = false;
+  VibratePattern vibrate;
+  any data = null;
+  NotificationBehavior mozbehavior = {};
+};
+
+dictionary GetNotificationOptions {
+  DOMString tag = "";
+};
+
+[GenerateToJSON]
+dictionary NotificationBehavior {
+  boolean noscreen = false;
+  boolean noclear = false;
+  boolean showOnlyOnce = false;
+  DOMString soundFile = "";
+  sequence<unsigned long> vibrationPattern;
+};
+
+enum NotificationPermission {
+  "default",
+  "denied",
+  "granted"
+};
+
+callback NotificationPermissionCallback = undefined (NotificationPermission permission);
+
+enum NotificationDirection {
+  "auto",
+  "ltr",
+  "rtl"
+};
diff --git a/dom/webidl/NotificationEvent.webidl b/dom/webidl/NotificationEvent.webidl
new file mode 100644
index 0000000000..9e77eb3434
--- /dev/null
+++ b/dom/webidl/NotificationEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://notifications.spec.whatwg.org/
+ *
+ * Copyright:
+ * To the extent possible under law, the editors have waived all copyright and
+ * related or neighboring rights to this work.
+ */
+
+[Exposed=ServiceWorker,Func="mozilla::dom::Notification::PrefEnabled"]
+interface NotificationEvent : ExtendableEvent {
+  constructor(DOMString type, NotificationEventInit eventInitDict);
+
+  [BinaryName="notification_"]
+  readonly attribute Notification notification;
+};
+
+dictionary NotificationEventInit : ExtendableEventInit {
+  required Notification notification;
+};
diff --git a/dom/webidl/NotifyPaintEvent.webidl b/dom/webidl/NotifyPaintEvent.webidl
new file mode 100644
index 0000000000..70252524e7
--- /dev/null
+++ b/dom/webidl/NotifyPaintEvent.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * The NotifyPaintEvent interface is used for the MozDOMAfterPaint
+ * event, which fires at a window when painting has happened in
+ * that window.
+ */
+[ChromeOnly,
+ Exposed=Window]
+interface NotifyPaintEvent : Event
+{
+  /**
+   * Get a list of rectangles which are affected. The rectangles are
+   * in CSS pixels relative to the viewport origin.
+   */
+  [ChromeOnly, NeedsCallerType]
+  readonly attribute DOMRectList clientRects;
+
+  /**
+   * Get the bounding box of the rectangles which are affected. The rectangle
+   * is in CSS pixels relative to the viewport origin.
+   */
+  [ChromeOnly, NeedsCallerType]
+  readonly attribute DOMRect boundingClientRect;
+
+  [ChromeOnly, NeedsCallerType]
+  readonly attribute PaintRequestList paintRequests;
+
+  [ChromeOnly, NeedsCallerType]
+  readonly attribute unsigned long long transactionId;
+
+  [ChromeOnly, NeedsCallerType]
+  readonly attribute DOMHighResTimeStamp paintTimeStamp;
+};
diff --git a/dom/webidl/OfflineAudioCompletionEvent.webidl b/dom/webidl/OfflineAudioCompletionEvent.webidl
new file mode 100644
index 0000000000..749aa5d889
--- /dev/null
+++ b/dom/webidl/OfflineAudioCompletionEvent.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary OfflineAudioCompletionEventInit : EventInit {
+    required AudioBuffer renderedBuffer;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface OfflineAudioCompletionEvent : Event {
+  constructor(DOMString type, OfflineAudioCompletionEventInit eventInitDict);
+
+  readonly attribute AudioBuffer renderedBuffer;
+};
diff --git a/dom/webidl/OfflineAudioContext.webidl b/dom/webidl/OfflineAudioContext.webidl
new file mode 100644
index 0000000000..a9f36f70c6
--- /dev/null
+++ b/dom/webidl/OfflineAudioContext.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary OfflineAudioContextOptions {
+             unsigned long numberOfChannels = 1;
+    required unsigned long length;
+    required float         sampleRate;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface OfflineAudioContext : BaseAudioContext {
+    [Throws]
+    constructor(OfflineAudioContextOptions contextOptions);
+    [Throws]
+    constructor(unsigned long numberOfChannels, unsigned long length,
+                float sampleRate);
+
+    [NewObject]
+    Promise<AudioBuffer> startRendering();
+
+    // TODO: Promise<undefined>   suspend (double suspendTime);
+
+    readonly        attribute unsigned long length;
+                    attribute EventHandler  oncomplete;
+};
diff --git a/dom/webidl/OffscreenCanvas.webidl b/dom/webidl/OffscreenCanvas.webidl
new file mode 100644
index 0000000000..408bee600d
--- /dev/null
+++ b/dom/webidl/OffscreenCanvas.webidl
@@ -0,0 +1,45 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://html.spec.whatwg.org/#the-offscreencanvas-interface
+ */
+
+typedef (OffscreenCanvasRenderingContext2D or ImageBitmapRenderingContext or WebGLRenderingContext or WebGL2RenderingContext or GPUCanvasContext) OffscreenRenderingContext;
+
+dictionary ImageEncodeOptions {
+  DOMString type = "image/png";
+  unrestricted double quality;
+};
+
+enum OffscreenRenderingContextId { "2d", "bitmaprenderer", "webgl", "webgl2", "webgpu" };
+
+[Exposed=(Window,Worker), Pref="gfx.offscreencanvas.enabled"]
+interface OffscreenCanvas : EventTarget {
+  [Throws]
+  constructor([EnforceRange] unsigned long width, [EnforceRange] unsigned long height);
+
+  [Pure, SetterThrows]
+  attribute [EnforceRange] unsigned long width;
+  [Pure, SetterThrows]
+  attribute [EnforceRange] unsigned long height;
+
+  [Throws]
+  OffscreenRenderingContext? getContext(OffscreenRenderingContextId contextId,
+                                        optional any contextOptions = null);
+
+  [Throws]
+  ImageBitmap transferToImageBitmap();
+  [NewObject]
+  Promise<Blob> convertToBlob(optional ImageEncodeOptions options = {});
+
+  attribute EventHandler oncontextlost;
+  attribute EventHandler oncontextrestored;
+
+  // Deprecated by convertToBlob
+  [Deprecated="OffscreenCanvasToBlob", NewObject]
+  Promise<Blob> toBlob(optional DOMString type = "",
+                       optional any encoderOptions);
+};
diff --git a/dom/webidl/OffscreenCanvasRenderingContext2D.webidl b/dom/webidl/OffscreenCanvasRenderingContext2D.webidl
new file mode 100644
index 0000000000..55f296a672
--- /dev/null
+++ b/dom/webidl/OffscreenCanvasRenderingContext2D.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://html.spec.whatwg.org/#the-offscreen-2d-rendering-context
+ */
+
+[Exposed=(Window,Worker), Pref="gfx.offscreencanvas.enabled"]
+interface OffscreenCanvasRenderingContext2D {
+  [Throws]
+  undefined commit();
+
+  readonly attribute OffscreenCanvas canvas;
+};
+
+OffscreenCanvasRenderingContext2D includes CanvasState;
+OffscreenCanvasRenderingContext2D includes CanvasTransform;
+OffscreenCanvasRenderingContext2D includes CanvasCompositing;
+OffscreenCanvasRenderingContext2D includes CanvasImageSmoothing;
+OffscreenCanvasRenderingContext2D includes CanvasFillStrokeStyles;
+OffscreenCanvasRenderingContext2D includes CanvasShadowStyles;
+OffscreenCanvasRenderingContext2D includes CanvasRect;
+OffscreenCanvasRenderingContext2D includes CanvasDrawPath;
+OffscreenCanvasRenderingContext2D includes CanvasText;
+OffscreenCanvasRenderingContext2D includes CanvasDrawImage;
+OffscreenCanvasRenderingContext2D includes CanvasImageData;
+OffscreenCanvasRenderingContext2D includes CanvasPathDrawingStyles;
+OffscreenCanvasRenderingContext2D includes CanvasTextDrawingStyles;
+OffscreenCanvasRenderingContext2D includes CanvasPathMethods;
diff --git a/dom/webidl/OscillatorNode.webidl b/dom/webidl/OscillatorNode.webidl
new file mode 100644
index 0000000000..7b5b407670
--- /dev/null
+++ b/dom/webidl/OscillatorNode.webidl
@@ -0,0 +1,45 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum OscillatorType {
+  "sine",
+  "square",
+  "sawtooth",
+  "triangle",
+  "custom"
+};
+
+dictionary OscillatorOptions : AudioNodeOptions {
+             OscillatorType type = "sine";
+             float          frequency = 440;
+             float          detune = 0;
+             PeriodicWave   periodicWave;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface OscillatorNode : AudioScheduledSourceNode {
+    [Throws]
+    constructor(BaseAudioContext context,
+                optional OscillatorOptions options = {});
+
+    [SetterThrows]
+    attribute OscillatorType type;
+
+    readonly attribute AudioParam frequency; // in Hertz
+    readonly attribute AudioParam detune; // in Cents
+
+    undefined setPeriodicWave(PeriodicWave periodicWave);
+};
+
+// Mozilla extensions
+OscillatorNode includes AudioNodePassThrough;
diff --git a/dom/webidl/PageTransitionEvent.webidl b/dom/webidl/PageTransitionEvent.webidl
new file mode 100644
index 0000000000..20bcd6f3f2
--- /dev/null
+++ b/dom/webidl/PageTransitionEvent.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * The PageTransitionEvent interface is used for the pageshow and
+ * pagehide events, which are generic events that apply to both page
+ * load/unload and saving/restoring a document from session history.
+ */
+
+[Exposed=Window]
+interface PageTransitionEvent : Event
+{
+  constructor(DOMString type,
+              optional PageTransitionEventInit eventInitDict = {});
+
+  /**
+   * Set to true if the document has been or will be persisted across
+   * firing of the event.  For example, if a document is being cached in
+   * session history, |persisted| is true for the PageHide event.
+   */
+  readonly attribute boolean persisted;
+
+  // Whether the document is in the middle of a frame swap.
+  [ChromeOnly]
+  readonly attribute boolean inFrameSwap;
+};
+
+dictionary PageTransitionEventInit : EventInit
+{
+  boolean persisted = false;
+  boolean inFrameSwap = false;
+};
diff --git a/dom/webidl/PaintRequest.webidl b/dom/webidl/PaintRequest.webidl
new file mode 100644
index 0000000000..ffe9e8ae74
--- /dev/null
+++ b/dom/webidl/PaintRequest.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * These objects are exposed by the MozDOMAfterPaint event. Each one represents
+ * a request to repaint a rectangle that was generated by the browser.
+ */
+[Exposed=Window]
+interface PaintRequest {
+  /**
+   * The client rect where invalidation was triggered.
+   */
+  readonly attribute DOMRect clientRect;
+
+  /**
+   * The reason for the request, as a string. If an empty string, then we don't know
+   * the reason (this is common). Reasons include "scroll repaint", meaning that we
+   * needed to repaint the rectangle due to scrolling, and "scroll copy", meaning
+   * that we updated the rectangle due to scrolling but instead of painting
+   * manually, we were able to do a copy from another area of the screen.
+   */
+  readonly attribute DOMString reason;
+};
diff --git a/dom/webidl/PaintRequestList.webidl b/dom/webidl/PaintRequestList.webidl
new file mode 100644
index 0000000000..b5f59e1ccf
--- /dev/null
+++ b/dom/webidl/PaintRequestList.webidl
@@ -0,0 +1,11 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface PaintRequestList {
+  readonly attribute unsigned long length;
+  getter PaintRequest? item(unsigned long index);
+};
diff --git a/dom/webidl/PaintWorkletGlobalScope.webidl b/dom/webidl/PaintWorkletGlobalScope.webidl
new file mode 100644
index 0000000000..1393db272f
--- /dev/null
+++ b/dom/webidl/PaintWorkletGlobalScope.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.css-houdini.org/css-paint-api-1/#paintworkletglobalscope
+ */
+
+[Global=(Worklet,PaintWorklet),Exposed=PaintWorklet]
+interface PaintWorkletGlobalScope : WorkletGlobalScope {
+    undefined registerPaint(DOMString name, VoidFunction paintCtor);
+};
diff --git a/dom/webidl/PannerNode.webidl b/dom/webidl/PannerNode.webidl
new file mode 100644
index 0000000000..c50e575d73
--- /dev/null
+++ b/dom/webidl/PannerNode.webidl
@@ -0,0 +1,84 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum PanningModelType {
+  "equalpower",
+  "HRTF"
+};
+
+enum DistanceModelType {
+  "linear",
+  "inverse",
+  "exponential"
+};
+
+dictionary PannerOptions : AudioNodeOptions {
+             PanningModelType  panningModel = "equalpower";
+             DistanceModelType distanceModel = "inverse";
+             float             positionX = 0;
+             float             positionY = 0;
+             float             positionZ = 0;
+             float             orientationX = 1;
+             float             orientationY = 0;
+             float             orientationZ = 0;
+             double            refDistance = 1;
+             double            maxDistance = 10000;
+             double            rolloffFactor = 1;
+             double            coneInnerAngle = 360;
+             double            coneOuterAngle = 360;
+             double            coneOuterGain = 0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface PannerNode : AudioNode {
+    [Throws]
+    constructor(BaseAudioContext context, optional PannerOptions options = {});
+
+    // Default for stereo is equalpower
+    attribute PanningModelType panningModel;
+
+    // Uses a 3D cartesian coordinate system
+    [Throws]
+    undefined setPosition(double x, double y, double z);
+    [Throws]
+    undefined setOrientation(double x, double y, double z);
+
+    // Cartesian coordinate for position
+    readonly attribute AudioParam positionX;
+    readonly attribute AudioParam positionY;
+    readonly attribute AudioParam positionZ;
+
+    // Cartesian coordinate for orientation
+    readonly attribute AudioParam orientationX;
+    readonly attribute AudioParam orientationY;
+    readonly attribute AudioParam orientationZ;
+
+    // Distance model and attributes
+    attribute DistanceModelType distanceModel;
+    [SetterThrows]
+    attribute double refDistance;
+    [SetterThrows]
+    attribute double maxDistance;
+    [SetterThrows]
+    attribute double rolloffFactor;
+
+    // Directional sound cone
+    attribute double coneInnerAngle;
+    attribute double coneOuterAngle;
+    [SetterThrows]
+    attribute double coneOuterGain;
+
+};
+
+// Mozilla extension
+PannerNode includes AudioNodePassThrough;
diff --git a/dom/webidl/ParentNode.webidl b/dom/webidl/ParentNode.webidl
new file mode 100644
index 0000000000..4350fb8a05
--- /dev/null
+++ b/dom/webidl/ParentNode.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#interface-parentnode
+ */
+
+interface mixin ParentNode {
+  [Constant]
+  readonly attribute HTMLCollection children;
+  [Pure]
+  readonly attribute Element? firstElementChild;
+  [Pure]
+  readonly attribute Element? lastElementChild;
+  [Pure]
+  readonly attribute unsigned long childElementCount;
+
+  [ChromeOnly]
+  HTMLCollection getElementsByAttribute(DOMString name,
+                                        [LegacyNullToEmptyString] DOMString value);
+  [ChromeOnly, Throws]
+  HTMLCollection getElementsByAttributeNS(DOMString? namespaceURI, DOMString name,
+                                          [LegacyNullToEmptyString] DOMString value);
+
+  [CEReactions, Throws, Unscopable]
+  undefined prepend((Node or DOMString)... nodes);
+  [CEReactions, Throws, Unscopable]
+  undefined append((Node or DOMString)... nodes);
+  [CEReactions, Throws, Unscopable]
+  undefined replaceChildren((Node or DOMString)... nodes);
+};
diff --git a/dom/webidl/PaymentAddress.webidl b/dom/webidl/PaymentAddress.webidl
new file mode 100644
index 0000000000..c678c6ef97
--- /dev/null
+++ b/dom/webidl/PaymentAddress.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://www.w3.org/TR/payment-request/#paymentaddress-interface
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[SecureContext,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled",
+ Exposed=Window]
+interface PaymentAddress {
+  [Default] object toJSON();
+
+  readonly attribute DOMString              country;
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  // readonly attribute FrozenArray<DOMString> addressLine;
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<DOMString>    addressLine;
+  readonly attribute DOMString              region;
+  readonly attribute DOMString              regionCode;
+  readonly attribute DOMString              city;
+  readonly attribute DOMString              dependentLocality;
+  readonly attribute DOMString              postalCode;
+  readonly attribute DOMString              sortingCode;
+  readonly attribute DOMString              organization;
+  readonly attribute DOMString              recipient;
+  readonly attribute DOMString              phone;
+};
diff --git a/dom/webidl/PaymentMethodChangeEvent.webidl b/dom/webidl/PaymentMethodChangeEvent.webidl
new file mode 100644
index 0000000000..525ca1cc3d
--- /dev/null
+++ b/dom/webidl/PaymentMethodChangeEvent.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://w3c.github.io/payment-request/#paymentmethodchangeevent-interface
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[SecureContext,
+ Exposed=Window,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled"]
+interface PaymentMethodChangeEvent : PaymentRequestUpdateEvent {
+    constructor(DOMString type,
+                optional PaymentMethodChangeEventInit eventInitDict = {});
+
+    readonly attribute DOMString methodName;
+    readonly attribute object?   methodDetails;
+};
+
+dictionary PaymentMethodChangeEventInit : PaymentRequestUpdateEventInit {
+    DOMString methodName = "";
+    object?   methodDetails = null;
+};
diff --git a/dom/webidl/PaymentRequest.webidl b/dom/webidl/PaymentRequest.webidl
new file mode 100644
index 0000000000..b9021e0b06
--- /dev/null
+++ b/dom/webidl/PaymentRequest.webidl
@@ -0,0 +1,132 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://w3c.github.io/payment-request/#paymentrequest-interface
+ *   https://w3c.github.io/payment-request/#idl-index
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary PaymentMethodData {
+  required DOMString           supportedMethods;
+           object              data;
+};
+
+dictionary PaymentCurrencyAmount {
+  required DOMString currency;
+  required DOMString value;
+};
+
+dictionary PaymentItem {
+  required DOMString             label;
+  required PaymentCurrencyAmount amount;
+           boolean               pending = false;
+};
+
+dictionary PaymentShippingOption {
+  required DOMString             id;
+  required DOMString             label;
+  required PaymentCurrencyAmount amount;
+           boolean               selected = false;
+};
+
+dictionary PaymentDetailsModifier {
+  required DOMString             supportedMethods;
+           PaymentItem           total;
+           sequence<PaymentItem> additionalDisplayItems;
+           object                data;
+};
+
+dictionary PaymentDetailsBase {
+  sequence<PaymentItem>            displayItems;
+  sequence<PaymentShippingOption>  shippingOptions;
+  sequence<PaymentDetailsModifier> modifiers;
+};
+
+dictionary PaymentDetailsInit : PaymentDetailsBase {
+           DOMString   id;
+  required PaymentItem total;
+};
+
+[GenerateInitFromJSON, GenerateToJSON]
+dictionary AddressErrors {
+  DOMString addressLine;
+  DOMString city;
+  DOMString country;
+  DOMString dependentLocality;
+  DOMString organization;
+  DOMString phone;
+  DOMString postalCode;
+  DOMString recipient;
+  DOMString region;
+  DOMString regionCode;
+  DOMString sortingCode;
+};
+
+dictionary PaymentValidationErrors {
+  PayerErrors payer;
+  AddressErrors shippingAddress;
+  DOMString error;
+  object paymentMethod;
+};
+
+[GenerateInitFromJSON, GenerateToJSON]
+dictionary PayerErrors {
+  DOMString email;
+  DOMString name;
+  DOMString phone;
+};
+
+dictionary PaymentDetailsUpdate : PaymentDetailsBase {
+  DOMString     error;
+  AddressErrors shippingAddressErrors;
+  PayerErrors payerErrors;
+  object paymentMethodErrors;
+  PaymentItem   total;
+};
+
+enum PaymentShippingType {
+  "shipping",
+  "delivery",
+  "pickup"
+};
+
+dictionary PaymentOptions {
+  boolean             requestPayerName = false;
+  boolean             requestPayerEmail = false;
+  boolean             requestPayerPhone = false;
+  boolean             requestShipping = false;
+  boolean             requestBillingAddress = false;
+  PaymentShippingType shippingType = "shipping";
+};
+
+[SecureContext,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled",
+ Exposed=Window]
+interface PaymentRequest : EventTarget {
+  [Throws]
+  constructor(sequence<PaymentMethodData> methodData,
+              PaymentDetailsInit details,
+              optional PaymentOptions options = {});
+
+  [NewObject]
+  Promise<PaymentResponse> show(optional Promise<PaymentDetailsUpdate> detailsPromise);
+  [NewObject]
+  Promise<undefined>       abort();
+  [NewObject]
+  Promise<boolean>         canMakePayment();
+
+  readonly attribute DOMString            id;
+  readonly attribute PaymentAddress?      shippingAddress;
+  readonly attribute DOMString?           shippingOption;
+  readonly attribute PaymentShippingType? shippingType;
+
+           attribute EventHandler         onmerchantvalidation;
+           attribute EventHandler         onshippingaddresschange;
+           attribute EventHandler         onshippingoptionchange;
+           attribute EventHandler         onpaymentmethodchange;
+};
diff --git a/dom/webidl/PaymentRequestUpdateEvent.webidl b/dom/webidl/PaymentRequestUpdateEvent.webidl
new file mode 100644
index 0000000000..a1428fecd7
--- /dev/null
+++ b/dom/webidl/PaymentRequestUpdateEvent.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https://w3c.github.io/payment-request/#paymentrequestupdateevent-interface
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[SecureContext,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled",
+ Exposed=Window]
+interface PaymentRequestUpdateEvent : Event {
+  constructor(DOMString type,
+              optional PaymentRequestUpdateEventInit eventInitDict = {});
+
+  [Throws]
+  undefined updateWith(Promise<PaymentDetailsUpdate> detailsPromise);
+};
+
+dictionary PaymentRequestUpdateEventInit : EventInit {
+};
diff --git a/dom/webidl/PaymentResponse.webidl b/dom/webidl/PaymentResponse.webidl
new file mode 100644
index 0000000000..581fabcb6a
--- /dev/null
+++ b/dom/webidl/PaymentResponse.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this WebIDL file is
+ *   https:/w3c.github.io/payment-request/#paymentresponse-interface
+ *
+ * Copyright © 2018 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum PaymentComplete {
+  "success",
+  "fail",
+  "unknown"
+};
+
+[SecureContext,
+ Func="mozilla::dom::PaymentRequest::PrefEnabled",
+ Exposed=Window]
+interface PaymentResponse : EventTarget {
+  [Default] object toJSON();
+
+  readonly attribute DOMString       requestId;
+  readonly attribute DOMString       methodName;
+  readonly attribute object          details;
+  readonly attribute PaymentAddress? shippingAddress;
+  readonly attribute DOMString?      shippingOption;
+  readonly attribute DOMString?      payerName;
+  readonly attribute DOMString?      payerEmail;
+  readonly attribute DOMString?      payerPhone;
+
+  [NewObject]
+  Promise<undefined> complete(optional PaymentComplete result = "unknown");
+
+  // If the dictionary argument has no required members, it must be optional.
+  [NewObject]
+  Promise<undefined> retry(optional PaymentValidationErrors errorFields = {});
+
+  attribute EventHandler onpayerdetailchange;
+};
diff --git a/dom/webidl/PeerConnectionImpl.webidl b/dom/webidl/PeerConnectionImpl.webidl
new file mode 100644
index 0000000000..5b59b629e5
--- /dev/null
+++ b/dom/webidl/PeerConnectionImpl.webidl
@@ -0,0 +1,134 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * PeerConnection.js' interface to the C++ PeerConnectionImpl.
+ *
+ * Do not confuse with RTCPeerConnection. This interface is purely for
+ * communication between the PeerConnection JS DOM binding and the C++
+ * implementation.
+ *
+ * See media/webrtc/signaling/include/PeerConnectionImpl.h
+ *
+ */
+
+interface nsISupports;
+
+callback ChainedOperation = Promise<any> ();
+
+/* Must be created first. Observer events will be dispatched on the thread provided */
+[ChromeOnly,
+ Exposed=Window]
+interface PeerConnectionImpl  {
+  constructor();
+
+  /* Must be called first. Observer events dispatched on the thread provided */
+  [Throws]
+  undefined initialize(PeerConnectionObserver observer, Window window);
+
+  /* JSEP calls */
+  [Throws]
+  undefined createOffer(optional RTCOfferOptions options = {});
+  [Throws]
+  undefined createAnswer();
+  [Throws]
+  undefined setLocalDescription(long action, DOMString sdp);
+  [Throws]
+  undefined setRemoteDescription(long action, DOMString sdp);
+
+  Promise<RTCStatsReport> getStats(MediaStreamTrack? selector);
+
+  sequence<MediaStream> getRemoteStreams();
+
+  /* Adds the tracks created by GetUserMedia */
+  [Throws]
+  RTCRtpTransceiver addTransceiver(RTCRtpTransceiverInit init,
+                                   DOMString kind,
+                                   MediaStreamTrack? sendTrack,
+                                   boolean addTrackMagic);
+  sequence<RTCRtpTransceiver> getTransceivers();
+
+  [Throws]
+  undefined closeStreams();
+
+  [Throws]
+  undefined enablePacketDump(unsigned long level,
+                             mozPacketDumpType type,
+                             boolean sending);
+
+  [Throws]
+  undefined disablePacketDump(unsigned long level,
+                              mozPacketDumpType type,
+                              boolean sending);
+
+  /* As the ICE candidates roll in this one should be called each time
+   * in order to keep the candidate list up-to-date for the next SDP-related
+   * call PeerConnectionImpl does not parse ICE candidates, just sticks them
+   * into the SDP.
+   */
+  [Throws]
+  undefined addIceCandidate(DOMString candidate,
+                            DOMString mid,
+                            DOMString ufrag,
+                            unsigned short? level);
+
+  /* Shuts down threads, deletes state */
+  [Throws]
+  undefined close();
+
+  [Throws]
+  undefined setConfiguration(optional RTCConfiguration config = {});
+
+  undefined restartIce();
+  undefined restartIceNoRenegotiationNeeded();
+
+  /* Notify DOM window if this plugin crash is ours. */
+  boolean pluginCrash(unsigned long long pluginId, DOMString name);
+
+  // Only throws if promise creation fails
+  [Throws]
+  Promise<undefined> onSetDescriptionSuccess(RTCSdpType type, boolean remote);
+
+  undefined onSetDescriptionError();
+
+  /* Attributes */
+  /* This provides the implementation with the certificate it uses to
+   * authenticate itself.  The JS side must set this before calling
+   * createOffer/createAnswer or retrieving the value of fingerprint.  This has
+   * to be delayed because generating the certificate takes some time. */
+  attribute RTCCertificate certificate;
+  [Constant]
+  readonly attribute DOMString fingerprint;
+  readonly attribute DOMString currentLocalDescription;
+  readonly attribute DOMString pendingLocalDescription;
+  readonly attribute DOMString currentRemoteDescription;
+  readonly attribute DOMString pendingRemoteDescription;
+  readonly attribute boolean? currentOfferer;
+  readonly attribute boolean? pendingOfferer;
+
+  readonly attribute RTCIceConnectionState iceConnectionState;
+  readonly attribute RTCIceGatheringState iceGatheringState;
+  readonly attribute RTCPeerConnectionState connectionState;
+  readonly attribute RTCSignalingState signalingState;
+  attribute DOMString id;
+
+  [SetterThrows]
+  attribute DOMString peerIdentity;
+  readonly attribute boolean privacyRequested;
+
+  readonly attribute RTCSctpTransport? sctp;
+
+  /* Data channels */
+  [Throws]
+  RTCDataChannel createDataChannel(DOMString label, DOMString protocol,
+    unsigned short type, boolean ordered,
+    unsigned short maxTime, unsigned short maxNum,
+    boolean externalNegotiated, unsigned short stream);
+
+  [Throws]
+  Promise<any> chain(ChainedOperation op);
+  undefined updateNegotiationNeeded();
+
+  boolean createdSender(RTCRtpSender sender);
+};
diff --git a/dom/webidl/PeerConnectionObserver.webidl b/dom/webidl/PeerConnectionObserver.webidl
new file mode 100644
index 0000000000..5f190303b4
--- /dev/null
+++ b/dom/webidl/PeerConnectionObserver.webidl
@@ -0,0 +1,56 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface nsISupports;
+
+dictionary PCErrorData
+{
+  required PCError name;
+  required DOMString message;
+  // Will need to add more stuff (optional) for RTCError
+};
+
+[ChromeOnly,
+ JSImplementation="@mozilla.org/dom/peerconnectionobserver;1",
+ Exposed=Window]
+interface PeerConnectionObserver
+{
+  [Throws]
+  constructor(RTCPeerConnection domPC);
+
+  /* JSEP callbacks */
+  undefined onCreateOfferSuccess(DOMString offer);
+  undefined onCreateOfferError(PCErrorData error);
+  undefined onCreateAnswerSuccess(DOMString answer);
+  undefined onCreateAnswerError(PCErrorData error);
+  undefined onSetDescriptionSuccess();
+  undefined onSetDescriptionError(PCErrorData error);
+  undefined onAddIceCandidateSuccess();
+  undefined onAddIceCandidateError(PCErrorData error);
+  undefined onIceCandidate(unsigned short level, DOMString mid, DOMString candidate, DOMString ufrag);
+
+  /* Data channel callbacks */
+  undefined notifyDataChannel(RTCDataChannel channel);
+
+  /* Notification of one of several types of state changed */
+  undefined onStateChange(PCObserverStateType state);
+
+  /*
+    Lets PeerConnectionImpl fire track events on the RTCPeerConnection
+  */
+  undefined fireTrackEvent(RTCRtpReceiver receiver, sequence<MediaStream> streams);
+
+  /*
+    Lets PeerConnectionImpl fire addstream events on the RTCPeerConnection
+  */
+  undefined fireStreamEvent(MediaStream stream);
+
+  undefined fireNegotiationNeededEvent();
+
+  /* Packet dump callback */
+  undefined onPacket(unsigned long level, mozPacketDumpType type, boolean sending,
+                     ArrayBuffer packet);
+};
diff --git a/dom/webidl/PeerConnectionObserverEnums.webidl b/dom/webidl/PeerConnectionObserverEnums.webidl
new file mode 100644
index 0000000000..e0f517ad82
--- /dev/null
+++ b/dom/webidl/PeerConnectionObserverEnums.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This is in a separate file so it can be shared with unittests.
+ */
+
+enum PCObserverStateType {
+    "None",
+    "IceConnectionState",
+    "IceGatheringState",
+    "SignalingState",
+    "ConnectionState",
+};
+
+enum PCError {
+  "UnknownError",
+  "InvalidAccessError",
+  "InvalidStateError",
+  "InvalidModificationError",
+  "OperationError",
+  "NotSupportedError",
+  "SyntaxError",
+  "NotReadableError",
+  "TypeError",
+  "RangeError",
+  "InvalidCharacterError"
+};
diff --git a/dom/webidl/Performance.webidl b/dom/webidl/Performance.webidl
new file mode 100644
index 0000000000..f8ea8dfdc9
--- /dev/null
+++ b/dom/webidl/Performance.webidl
@@ -0,0 +1,97 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/hr-time/#sec-performance
+ * https://w3c.github.io/navigation-timing/#extensions-to-the-performance-interface
+ * https://w3c.github.io/performance-timeline/#extensions-to-the-performance-interface
+ * https://w3c.github.io/resource-timing/#sec-extensions-performance-interface
+ * https://w3c.github.io/user-timing/#extensions-performance-interface
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio, Beihang).
+ * W3C liability, trademark and document use rules apply.
+ */
+
+// DOMTimeStamp is deprecated, use EpochTimeStamp instead.
+typedef unsigned long long DOMTimeStamp;
+typedef unsigned long long EpochTimeStamp;
+typedef double DOMHighResTimeStamp;
+typedef sequence <PerformanceEntry> PerformanceEntryList;
+
+// https://w3c.github.io/hr-time/#sec-performance
+[Exposed=(Window,Worker)]
+interface Performance : EventTarget {
+  [DependsOn=DeviceState, Affects=Nothing]
+  DOMHighResTimeStamp now();
+
+  [Constant]
+  readonly attribute DOMHighResTimeStamp timeOrigin;
+
+  [Default] object toJSON();
+};
+
+// https://w3c.github.io/navigation-timing/#extensions-to-the-performance-interface
+[Exposed=Window]
+partial interface Performance {
+  [Constant]
+  readonly attribute PerformanceTiming timing;
+  [Constant]
+  readonly attribute PerformanceNavigation navigation;
+};
+
+// https://w3c.github.io/performance-timeline/#extensions-to-the-performance-interface
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  PerformanceEntryList getEntries();
+  PerformanceEntryList getEntriesByType(DOMString entryType);
+  PerformanceEntryList getEntriesByName(DOMString name, optional DOMString
+    entryType);
+};
+
+// https://w3c.github.io/resource-timing/#sec-extensions-performance-interface
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  undefined clearResourceTimings();
+  undefined setResourceTimingBufferSize(unsigned long maxSize);
+  attribute EventHandler onresourcetimingbufferfull;
+};
+
+// GC microbenchmarks, pref-guarded, not for general use (bug 1125412)
+[Exposed=Window]
+partial interface Performance {
+  [Pref="dom.enable_memory_stats"]
+  readonly attribute object mozMemory;
+};
+
+// https://w3c.github.io/user-timing/#extensions-performance-interface
+dictionary PerformanceMarkOptions {
+  any detail;
+  DOMHighResTimeStamp startTime;
+};
+
+// https://w3c.github.io/user-timing/#extensions-performance-interface
+dictionary PerformanceMeasureOptions {
+  any detail;
+  (DOMString or DOMHighResTimeStamp) start;
+  DOMHighResTimeStamp duration;
+  (DOMString or DOMHighResTimeStamp) end;
+};
+
+// https://w3c.github.io/user-timing/#extensions-performance-interface
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  [Throws]
+  PerformanceMark mark(DOMString markName, optional PerformanceMarkOptions markOptions = {});
+  undefined clearMarks(optional DOMString markName);
+  [Throws]
+  PerformanceMeasure measure(DOMString measureName, optional (DOMString or PerformanceMeasureOptions) startOrMeasureOptions = {}, optional DOMString endMark);
+  undefined clearMeasures(optional DOMString measureName);
+};
+
+[Exposed=Window]
+partial interface Performance {
+  [Pref="dom.enable_event_timing", SameObject]
+  readonly attribute EventCounts eventCounts;
+};
diff --git a/dom/webidl/PerformanceEntry.webidl b/dom/webidl/PerformanceEntry.webidl
new file mode 100644
index 0000000000..ddd094bbb9
--- /dev/null
+++ b/dom/webidl/PerformanceEntry.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/performance-timeline/#dom-performanceentry
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface PerformanceEntry
+{
+  readonly attribute DOMString name;
+  readonly attribute DOMString entryType;
+  readonly attribute DOMHighResTimeStamp startTime;
+  readonly attribute DOMHighResTimeStamp duration;
+
+  [Default] object toJSON();
+};
diff --git a/dom/webidl/PerformanceEntryEvent.webidl b/dom/webidl/PerformanceEntryEvent.webidl
new file mode 100644
index 0000000000..4ddbc8049a
--- /dev/null
+++ b/dom/webidl/PerformanceEntryEvent.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary PerformanceEntryEventInit : EventInit
+{
+  DOMString name = "";
+  DOMString entryType = "";
+  DOMHighResTimeStamp startTime = 0;
+  DOMHighResTimeStamp duration = 0;
+  double epoch = 0;
+  DOMString origin = "";
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface PerformanceEntryEvent : Event
+{
+  constructor(DOMString type,
+              optional PerformanceEntryEventInit eventInitDict = {});
+
+  readonly attribute DOMString name;
+  readonly attribute DOMString entryType;
+  readonly attribute DOMHighResTimeStamp startTime;
+  readonly attribute DOMHighResTimeStamp duration;
+  readonly attribute double epoch;
+  readonly attribute DOMString origin;
+};
diff --git a/dom/webidl/PerformanceEventTiming.webidl b/dom/webidl/PerformanceEventTiming.webidl
new file mode 100644
index 0000000000..08edad1da1
--- /dev/null
+++ b/dom/webidl/PerformanceEventTiming.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/navigation-timing/#the-performancenavigation-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.enable_event_timing",
+ Exposed=Window]
+interface EventCounts {
+    readonly maplike<DOMString, unsigned long long>;
+};
+
+[Pref="dom.enable_event_timing",
+ Exposed=Window]
+interface PerformanceEventTiming : PerformanceEntry {
+    readonly attribute DOMHighResTimeStamp processingStart;
+    readonly attribute DOMHighResTimeStamp processingEnd;
+    readonly attribute boolean cancelable;
+    readonly attribute Node? target;
+
+    [Default] object toJSON();
+};
diff --git a/dom/webidl/PerformanceLargestContentfulPaint.webidl b/dom/webidl/PerformanceLargestContentfulPaint.webidl
new file mode 100644
index 0000000000..11f29a1147
--- /dev/null
+++ b/dom/webidl/PerformanceLargestContentfulPaint.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/largest-contentful-paint/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.enable_largest_contentful_paint",
+ Exposed=Window]
+interface LargestContentfulPaint : PerformanceEntry {
+    readonly attribute DOMHighResTimeStamp renderTime;
+    readonly attribute DOMHighResTimeStamp loadTime;
+    readonly attribute unsigned long size;
+    readonly attribute DOMString id;
+    readonly attribute DOMString url;
+    readonly attribute Element? element;
+    [Default] object toJSON();
+};
diff --git a/dom/webidl/PerformanceMark.webidl b/dom/webidl/PerformanceMark.webidl
new file mode 100644
index 0000000000..8b2bdd689e
--- /dev/null
+++ b/dom/webidl/PerformanceMark.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/user-timing/#performancemark
+ */
+
+[Exposed=(Window,Worker)]
+interface PerformanceMark : PerformanceEntry
+{
+  [Throws]
+  constructor(DOMString markName, optional PerformanceMarkOptions markOptions = {});
+  readonly attribute any detail;
+};
diff --git a/dom/webidl/PerformanceMeasure.webidl b/dom/webidl/PerformanceMeasure.webidl
new file mode 100644
index 0000000000..a520778b88
--- /dev/null
+++ b/dom/webidl/PerformanceMeasure.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/user-timing/#performancemeasure
+ */
+
+[Exposed=(Window,Worker)]
+interface PerformanceMeasure : PerformanceEntry
+{
+  readonly attribute any detail;
+};
diff --git a/dom/webidl/PerformanceNavigation.webidl b/dom/webidl/PerformanceNavigation.webidl
new file mode 100644
index 0000000000..ff3dbb4944
--- /dev/null
+++ b/dom/webidl/PerformanceNavigation.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/navigation-timing/#the-performancenavigation-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface PerformanceNavigation {
+  const unsigned short TYPE_NAVIGATE = 0;
+  const unsigned short TYPE_RELOAD = 1;
+  const unsigned short TYPE_BACK_FORWARD = 2;
+  const unsigned short TYPE_RESERVED = 255;
+
+  readonly attribute unsigned short type;
+  readonly attribute unsigned short redirectCount;
+
+  [Default] object toJSON();
+};
diff --git a/dom/webidl/PerformanceNavigationTiming.webidl b/dom/webidl/PerformanceNavigationTiming.webidl
new file mode 100644
index 0000000000..cf02997230
--- /dev/null
+++ b/dom/webidl/PerformanceNavigationTiming.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/navigation-timing/#sec-PerformanceNavigationTiming
+ *
+ * Copyright © 2016 W3C® (MIT, ERCIM, Keio, Beihang).
+ * W3C liability, trademark and document use rules apply.
+ */
+
+enum NavigationType {
+  "navigate",
+  "reload",
+  "back_forward",
+  "prerender"
+};
+
+[Exposed=Window,
+ Func="mozilla::dom::PerformanceNavigationTiming::Enabled"]
+interface PerformanceNavigationTiming : PerformanceResourceTiming {
+  readonly        attribute DOMHighResTimeStamp unloadEventStart;
+  readonly        attribute DOMHighResTimeStamp unloadEventEnd;
+  readonly        attribute DOMHighResTimeStamp domInteractive;
+  readonly        attribute DOMHighResTimeStamp domContentLoadedEventStart;
+  readonly        attribute DOMHighResTimeStamp domContentLoadedEventEnd;
+  readonly        attribute DOMHighResTimeStamp domComplete;
+  readonly        attribute DOMHighResTimeStamp loadEventStart;
+  readonly        attribute DOMHighResTimeStamp loadEventEnd;
+  readonly        attribute NavigationType      type;
+  readonly        attribute unsigned short      redirectCount;
+
+  [Default] object toJSON();
+};
diff --git a/dom/webidl/PerformanceObserver.webidl b/dom/webidl/PerformanceObserver.webidl
new file mode 100644
index 0000000000..041490e9d8
--- /dev/null
+++ b/dom/webidl/PerformanceObserver.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/performance-timeline/#the-performanceobserver-interface
+ */
+
+dictionary PerformanceObserverInit {
+  sequence<DOMString> entryTypes;
+  DOMString type;
+  boolean buffered;
+  [Pref="dom.enable_event_timing"]
+  DOMHighResTimeStamp durationThreshold;
+};
+
+callback PerformanceObserverCallback = undefined (PerformanceObserverEntryList entries,
+                                                  PerformanceObserver observer);
+
+[Pref="dom.enable_performance_observer",
+ Exposed=(Window,Worker)]
+interface PerformanceObserver {
+    [Throws]
+    constructor(PerformanceObserverCallback callback);
+
+    [Throws] undefined observe(optional PerformanceObserverInit options = {});
+    undefined disconnect();
+    PerformanceEntryList takeRecords();
+    static readonly attribute object supportedEntryTypes;
+};
diff --git a/dom/webidl/PerformanceObserverEntryList.webidl b/dom/webidl/PerformanceObserverEntryList.webidl
new file mode 100644
index 0000000000..6e31d3164e
--- /dev/null
+++ b/dom/webidl/PerformanceObserverEntryList.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/performance-timeline/#the-performanceobserverentrylist-interface
+ */
+
+// XXX should be moved into Performance.webidl.
+dictionary PerformanceEntryFilterOptions {
+  DOMString name;
+  DOMString entryType;
+  DOMString initiatorType;
+};
+
+[Pref="dom.enable_performance_observer",
+ Exposed=(Window,Worker)]
+interface PerformanceObserverEntryList {
+  PerformanceEntryList getEntries(optional PerformanceEntryFilterOptions filter = {});
+  PerformanceEntryList getEntriesByType(DOMString entryType);
+  PerformanceEntryList getEntriesByName(DOMString name,
+                                        optional DOMString entryType);
+};
diff --git a/dom/webidl/PerformancePaintTiming.webidl b/dom/webidl/PerformancePaintTiming.webidl
new file mode 100644
index 0000000000..6551bdfd8d
--- /dev/null
+++ b/dom/webidl/PerformancePaintTiming.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/paint-timing/#sec-PerformancePaintTiming
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window)]
+interface PerformancePaintTiming : PerformanceEntry
+{
+};
diff --git a/dom/webidl/PerformanceResourceTiming.webidl b/dom/webidl/PerformanceResourceTiming.webidl
new file mode 100644
index 0000000000..83c7737148
--- /dev/null
+++ b/dom/webidl/PerformanceResourceTiming.webidl
@@ -0,0 +1,58 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/resource-timing/#sec-performanceresourcetiming
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface PerformanceResourceTiming : PerformanceEntry
+{
+  readonly attribute DOMString initiatorType;
+  readonly attribute DOMString nextHopProtocol;
+
+  readonly attribute DOMHighResTimeStamp workerStart;
+
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp redirectStart;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp redirectEnd;
+
+  readonly attribute DOMHighResTimeStamp fetchStart;
+
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp domainLookupStart;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp domainLookupEnd;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp connectStart;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp connectEnd;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp secureConnectionStart;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp requestStart;
+  [NeedsSubjectPrincipal]
+  readonly attribute DOMHighResTimeStamp responseStart;
+
+  readonly attribute DOMHighResTimeStamp responseEnd;
+
+  [NeedsSubjectPrincipal]
+  readonly attribute unsigned long long transferSize;
+  [NeedsSubjectPrincipal]
+  readonly attribute unsigned long long encodedBodySize;
+  [NeedsSubjectPrincipal]
+  readonly attribute unsigned long long decodedBodySize;
+
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  // readonly attribute FrozenArray<PerformanceServerTiming> serverTiming;
+  [SecureContext, Frozen, Cached, Pure, NeedsSubjectPrincipal]
+  readonly attribute sequence<PerformanceServerTiming> serverTiming;
+
+  [Default] object toJSON();
+};
diff --git a/dom/webidl/PerformanceServerTiming.webidl b/dom/webidl/PerformanceServerTiming.webidl
new file mode 100644
index 0000000000..0fd7a54fc2
--- /dev/null
+++ b/dom/webidl/PerformanceServerTiming.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/server-timing/#the-performanceservertiming-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[SecureContext,Exposed=(Window,Worker)]
+interface PerformanceServerTiming {
+  readonly attribute DOMString           name;
+  readonly attribute DOMHighResTimeStamp duration;
+  readonly attribute DOMString           description;
+
+  [Default] object toJSON();
+};
diff --git a/dom/webidl/PerformanceTiming.webidl b/dom/webidl/PerformanceTiming.webidl
new file mode 100644
index 0000000000..f1ea315c7b
--- /dev/null
+++ b/dom/webidl/PerformanceTiming.webidl
@@ -0,0 +1,60 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/navigation-timing/#the-performancetiming-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface PerformanceTiming {
+  readonly attribute unsigned long long navigationStart;
+  readonly attribute unsigned long long unloadEventStart;
+  readonly attribute unsigned long long unloadEventEnd;
+  readonly attribute unsigned long long redirectStart;
+  readonly attribute unsigned long long redirectEnd;
+  readonly attribute unsigned long long fetchStart;
+  readonly attribute unsigned long long domainLookupStart;
+  readonly attribute unsigned long long domainLookupEnd;
+  readonly attribute unsigned long long connectStart;
+  readonly attribute unsigned long long connectEnd;
+  readonly attribute unsigned long long secureConnectionStart;
+  readonly attribute unsigned long long requestStart;
+  readonly attribute unsigned long long responseStart;
+  readonly attribute unsigned long long responseEnd;
+  readonly attribute unsigned long long domLoading;
+  readonly attribute unsigned long long domInteractive;
+  readonly attribute unsigned long long domContentLoadedEventStart;
+  readonly attribute unsigned long long domContentLoadedEventEnd;
+  readonly attribute unsigned long long domComplete;
+  readonly attribute unsigned long long loadEventStart;
+  readonly attribute unsigned long long loadEventEnd;
+
+  // This is a Chrome proprietary extension and not part of the
+  // performance/navigation timing specification.
+  // Returns 0 if a non-blank paint has not happened.
+  [Pref="dom.performance.time_to_non_blank_paint.enabled"]
+  readonly attribute unsigned long long timeToNonBlankPaint;
+
+  // Returns 0 if a contentful paint has not happened.
+  [Pref="dom.performance.time_to_contentful_paint.enabled"]
+  readonly attribute unsigned long long timeToContentfulPaint;
+
+  // This is a Mozilla proprietary extension and not part of the
+  // performance/navigation timing specification. It marks the
+  // completion of the first presentation flush after DOMContentLoaded.
+  [Pref="dom.performance.time_to_dom_content_flushed.enabled"]
+  readonly attribute unsigned long long timeToDOMContentFlushed;
+
+  // This is a Chrome proprietary extension and not part of the
+  // performance/navigation timing specification.
+  // Returns 0 if a time-to-interactive measurement has not happened.
+  [Pref="dom.performance.time_to_first_interactive.enabled"]
+  readonly attribute unsigned long long timeToFirstInteractive;
+
+  [Default] object toJSON();
+};
diff --git a/dom/webidl/PeriodicWave.webidl b/dom/webidl/PeriodicWave.webidl
new file mode 100644
index 0000000000..e1a14b4d36
--- /dev/null
+++ b/dom/webidl/PeriodicWave.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary PeriodicWaveConstraints {
+  boolean disableNormalization = false;
+};
+
+dictionary PeriodicWaveOptions : PeriodicWaveConstraints {
+             sequence<float> real;
+             sequence<float> imag;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface PeriodicWave {
+  [Throws]
+  constructor(BaseAudioContext context,
+              optional PeriodicWaveOptions options = {});
+};
diff --git a/dom/webidl/PermissionStatus.webidl b/dom/webidl/PermissionStatus.webidl
new file mode 100644
index 0000000000..fc791a123f
--- /dev/null
+++ b/dom/webidl/PermissionStatus.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/permissions/#status-of-a-permission
+ */
+
+enum PermissionState {
+  "granted",
+  "denied",
+  "prompt"
+};
+
+[Exposed=Window]
+interface PermissionStatus : EventTarget {
+  readonly attribute PermissionName name;
+  readonly attribute PermissionState state;
+  attribute EventHandler onchange;
+};
diff --git a/dom/webidl/Permissions.webidl b/dom/webidl/Permissions.webidl
new file mode 100644
index 0000000000..a6d7286a7a
--- /dev/null
+++ b/dom/webidl/Permissions.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/permissions/#permissions-interface
+ */
+
+enum PermissionName {
+  "geolocation",
+  "notifications",
+  "push",
+  "persistent-storage",
+  "midi"
+};
+
+[GenerateInit]
+dictionary PermissionDescriptor {
+  required PermissionName name;
+};
+
+[GenerateInit]
+dictionary MidiPermissionDescriptor : PermissionDescriptor {
+  boolean sysex;
+};
+
+// We don't implement `PushPermissionDescriptor` because we use a background
+// message quota instead of `userVisibleOnly`.
+
+[Exposed=Window]
+interface Permissions {
+  [NewObject]
+  Promise<PermissionStatus> query(object permission);
+  [NewObject, Pref="dom.permissions.revoke.enable"]
+  Promise<PermissionStatus> revoke(object permission);
+};
diff --git a/dom/webidl/Plugin.webidl b/dom/webidl/Plugin.webidl
new file mode 100644
index 0000000000..8e66858d77
--- /dev/null
+++ b/dom/webidl/Plugin.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[LegacyUnenumerableNamedProperties,
+ Exposed=Window]
+interface Plugin {
+  readonly attribute DOMString description;
+  readonly attribute DOMString filename;
+  readonly attribute DOMString name;
+
+  readonly attribute unsigned long length;
+  getter MimeType? item(unsigned long index);
+  getter MimeType? namedItem(DOMString name);
+};
diff --git a/dom/webidl/PluginArray.webidl b/dom/webidl/PluginArray.webidl
new file mode 100644
index 0000000000..06dbc5e59f
--- /dev/null
+++ b/dom/webidl/PluginArray.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[LegacyUnenumerableNamedProperties,
+ Exposed=Window]
+interface PluginArray {
+  undefined refresh();
+  readonly attribute unsigned long length;
+  getter Plugin? item(unsigned long index);
+  getter Plugin? namedItem(DOMString name);
+};
diff --git a/dom/webidl/PluginCrashedEvent.webidl b/dom/webidl/PluginCrashedEvent.webidl
new file mode 100644
index 0000000000..d683d74e0d
--- /dev/null
+++ b/dom/webidl/PluginCrashedEvent.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly,
+ Exposed=Window]
+interface PluginCrashedEvent : Event
+{
+  constructor(DOMString type,
+              optional PluginCrashedEventInit eventInitDict = {});
+
+  readonly attribute unsigned long pluginID;
+  readonly attribute DOMString pluginDumpID;
+  readonly attribute DOMString pluginName;
+  readonly attribute DOMString? pluginFilename;
+  readonly attribute boolean submittedCrashReport;
+  readonly attribute boolean gmpPlugin;
+};
+
+dictionary PluginCrashedEventInit : EventInit
+{
+  unsigned long pluginID = 0;
+  DOMString pluginDumpID = "";
+  DOMString pluginName = "";
+  DOMString? pluginFilename = null;
+  boolean submittedCrashReport = false;
+  boolean gmpPlugin = false;
+};
diff --git a/dom/webidl/PointerEvent.webidl b/dom/webidl/PointerEvent.webidl
new file mode 100644
index 0000000000..bdcdd1b8e3
--- /dev/null
+++ b/dom/webidl/PointerEvent.webidl
@@ -0,0 +1,47 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information see nsIPointerEvent.idl.
+ *
+ * Portions Copyright 2013 Microsoft Open Technologies, Inc. */
+
+interface WindowProxy;
+
+[Exposed=Window]
+interface PointerEvent : MouseEvent
+{
+  constructor(DOMString type, optional PointerEventInit eventInitDict = {});
+
+  readonly attribute long pointerId;
+
+  readonly attribute long width;
+  readonly attribute long height;
+  readonly attribute float pressure;
+  readonly attribute float tangentialPressure;
+  readonly attribute long tiltX;
+  readonly attribute long tiltY;
+  readonly attribute long twist;
+
+  readonly attribute DOMString pointerType;
+  readonly attribute boolean isPrimary;
+  sequence<PointerEvent> getCoalescedEvents();
+  sequence<PointerEvent> getPredictedEvents();
+};
+
+dictionary PointerEventInit : MouseEventInit
+{
+  long pointerId = 0;
+  long width = 1;
+  long height = 1;
+  float pressure = 0;
+  float tangentialPressure = 0;
+  long tiltX = 0;
+  long tiltY = 0;
+  long twist = 0;
+  DOMString pointerType = "";
+  boolean isPrimary = false;
+  sequence<PointerEvent> coalescedEvents = [];
+  sequence<PointerEvent> predictedEvents = [];
+};
diff --git a/dom/webidl/PopStateEvent.webidl b/dom/webidl/PopStateEvent.webidl
new file mode 100644
index 0000000000..738a7dc14a
--- /dev/null
+++ b/dom/webidl/PopStateEvent.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface PopStateEvent : Event
+{
+  constructor(DOMString type, optional PopStateEventInit eventInitDict = {});
+
+  readonly attribute any state;
+};
+
+dictionary PopStateEventInit : EventInit
+{
+  any state = null;
+};
diff --git a/dom/webidl/PopoverInvokerElement.webidl b/dom/webidl/PopoverInvokerElement.webidl
new file mode 100644
index 0000000000..b5d98856b7
--- /dev/null
+++ b/dom/webidl/PopoverInvokerElement.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/popover.html#popoverinvokerelement
+ */
+
+interface mixin PopoverInvokerElement {
+  [Pref="dom.element.popover.enabled", CEReactions] attribute Element? popoverTargetElement;
+  [Pref="dom.element.popover.enabled", CEReactions] attribute DOMString popoverTargetAction;
+};
diff --git a/dom/webidl/PopupBlockedEvent.webidl b/dom/webidl/PopupBlockedEvent.webidl
new file mode 100644
index 0000000000..888dc3899d
--- /dev/null
+++ b/dom/webidl/PopupBlockedEvent.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+interface URI;
+
+[Exposed=Window]
+interface PopupBlockedEvent : Event
+{
+  constructor(DOMString type,
+              optional PopupBlockedEventInit eventInitDict = {});
+
+  readonly attribute Window? requestingWindow;
+  readonly attribute URI? popupWindowURI;
+  readonly attribute DOMString? popupWindowName;
+  readonly attribute DOMString? popupWindowFeatures;
+};
+
+dictionary PopupBlockedEventInit : EventInit
+{
+  Window? requestingWindow = null;
+  URI? popupWindowURI = null;
+  DOMString popupWindowName = "";
+  DOMString popupWindowFeatures = "";
+};
diff --git a/dom/webidl/PopupPositionedEvent.webidl b/dom/webidl/PopupPositionedEvent.webidl
new file mode 100644
index 0000000000..8306d153b8
--- /dev/null
+++ b/dom/webidl/PopupPositionedEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary PopupPositionedEventInit : EventInit {
+  boolean isAnchored = false;
+  /**
+   * Returns the alignment position where the popup has appeared relative to its
+   * anchor node or point, accounting for any flipping that occurred.
+   */
+  DOMString alignmentPosition = "";
+  long alignmentOffset = 0;
+};
+
+[ChromeOnly, Exposed=Window]
+interface PopupPositionedEvent : Event {
+  constructor(DOMString type, optional PopupPositionedEventInit init = {});
+
+  readonly attribute boolean isAnchored;
+  readonly attribute DOMString alignmentPosition;
+  readonly attribute long alignmentOffset;
+};
diff --git a/dom/webidl/PositionStateEvent.webidl b/dom/webidl/PositionStateEvent.webidl
new file mode 100644
index 0000000000..a393172991
--- /dev/null
+++ b/dom/webidl/PositionStateEvent.webidl
@@ -0,0 +1,19 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary PositionStateEventInit : EventInit {
+  required double duration;
+  required double playbackRate;
+  required double position;
+};
+
+[Exposed=Window, ChromeOnly]
+interface PositionStateEvent : Event {
+  constructor(DOMString type, optional PositionStateEventInit eventInitDict = {});
+  readonly attribute double duration;
+  readonly attribute double playbackRate;
+  readonly attribute double position;
+};
diff --git a/dom/webidl/ProcessingInstruction.webidl b/dom/webidl/ProcessingInstruction.webidl
new file mode 100644
index 0000000000..59f8228b83
--- /dev/null
+++ b/dom/webidl/ProcessingInstruction.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#interface-processinginstruction
+ * https://drafts.csswg.org/cssom/#requirements-on-user-agents-implementing-the-xml-stylesheet-processing-instruction
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// https://dom.spec.whatwg.org/#interface-processinginstruction
+[Exposed=Window]
+interface ProcessingInstruction : CharacterData {
+  readonly attribute DOMString target;
+};
+
+// https://drafts.csswg.org/cssom/#requirements-on-user-agents-implementing-the-xml-stylesheet-processing-instruction
+ProcessingInstruction includes LinkStyle;
diff --git a/dom/webidl/ProfileTimelineMarker.webidl b/dom/webidl/ProfileTimelineMarker.webidl
new file mode 100644
index 0000000000..b9e614e6a6
--- /dev/null
+++ b/dom/webidl/ProfileTimelineMarker.webidl
@@ -0,0 +1,76 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// For Javascript markers, the |stack| of a ProfileTimelineMarker
+// holds an object of this type.  It intentionally looks like a
+// SavedStack object and is a representation of the frame that is
+// about to be constructed at the entry point.
+[GenerateConversionToJS]
+dictionary ProfileTimelineStackFrame {
+  long line;
+  long column = 0;
+  DOMString source;
+  DOMString functionDisplayName;
+  object? parent = null;
+  object? asyncParent = null;
+  DOMString asyncCause;
+};
+
+dictionary ProfileTimelineLayerRect {
+  long x = 0;
+  long y = 0;
+  long width = 0;
+  long height = 0;
+};
+
+enum ProfileTimelineMessagePortOperationType {
+  "serializeData",
+  "deserializeData",
+};
+
+enum ProfileTimelineWorkerOperationType {
+  "serializeDataOffMainThread",
+  "serializeDataOnMainThread",
+  "deserializeDataOffMainThread",
+  "deserializeDataOnMainThread",
+};
+
+[GenerateConversionToJS]
+dictionary ProfileTimelineMarker {
+  DOMString name = "";
+  DOMHighResTimeStamp start = 0;
+  DOMHighResTimeStamp end = 0;
+  object? stack = null;
+
+  unsigned short processType;
+  boolean isOffMainThread;
+
+  /* For ConsoleTime, Timestamp and Javascript markers.  */
+  DOMString causeName;
+
+  /* For ConsoleTime markers.  */
+  object? endStack = null;
+
+  /* For DOMEvent markers.  */
+  DOMString type;
+  unsigned short eventPhase;
+
+  /* For document::DOMContentLoaded and document::Load markers. Using this
+   * instead of the `start` and `end` timestamps is strongly discouraged. */
+  unsigned long long unixTime; // in microseconds
+
+  /* For Paint markers.  */
+  sequence<ProfileTimelineLayerRect> rectangles;
+
+  /* For Style markers. */
+  boolean isAnimationOnly;
+
+  /* For MessagePort markers. */
+  ProfileTimelineMessagePortOperationType messagePortOperation;
+
+  /* For Worker markers. */
+  ProfileTimelineWorkerOperationType workerOperation;
+};
diff --git a/dom/webidl/ProgressEvent.webidl b/dom/webidl/ProgressEvent.webidl
new file mode 100644
index 0000000000..56b1e72b13
--- /dev/null
+++ b/dom/webidl/ProgressEvent.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=(Window,Worker)]
+interface ProgressEvent : Event
+{
+  constructor(DOMString type, optional ProgressEventInit eventInitDict = {});
+
+  readonly attribute boolean lengthComputable;
+  readonly attribute unsigned long long loaded;
+  readonly attribute unsigned long long total;
+};
+
+dictionary ProgressEventInit : EventInit
+{
+  boolean lengthComputable = false;
+  unsigned long long loaded = 0;
+  unsigned long long total = 0;
+};
diff --git a/dom/webidl/Promise.webidl b/dom/webidl/Promise.webidl
new file mode 100644
index 0000000000..0fc9dc0950
--- /dev/null
+++ b/dom/webidl/Promise.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This IDL file contains utilities to help connect JS promises to our
+ * Web IDL infrastructure.
+ */
+
+callback PromiseJobCallback = undefined();
+
+[TreatNonCallableAsNull]
+callback AnyCallback = any (any value);
+
+// Hack to allow us to have JS owning and properly tracing/CCing/etc a
+// PromiseNativeHandler.
+[LegacyNoInterfaceObject, Exposed=(Window,Worker)]
+interface PromiseNativeHandler {
+};
diff --git a/dom/webidl/PromiseRejectionEvent.webidl b/dom/webidl/PromiseRejectionEvent.webidl
new file mode 100644
index 0000000000..df027e909e
--- /dev/null
+++ b/dom/webidl/PromiseRejectionEvent.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/webappapis.html#the-promiserejectionevent-interface
+ */
+
+[Exposed=(Window,Worker)]
+interface PromiseRejectionEvent : Event
+{
+  constructor(DOMString type, PromiseRejectionEventInit eventInitDict);
+
+  [BinaryName="rejectedPromise"]
+  readonly attribute Promise<any> promise;
+  readonly attribute any reason;
+};
+
+dictionary PromiseRejectionEventInit : EventInit {
+  required Promise<any> promise;
+           any reason;
+};
diff --git a/dom/webidl/PushEvent.webidl b/dom/webidl/PushEvent.webidl
new file mode 100644
index 0000000000..6a47e8a62b
--- /dev/null
+++ b/dom/webidl/PushEvent.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/push-api/
+ */
+
+[Pref="dom.push.enabled",
+ Exposed=ServiceWorker]
+interface PushEvent : ExtendableEvent {
+  [Throws]
+  constructor(DOMString type, optional PushEventInit eventInitDict = {});
+
+  readonly attribute PushMessageData? data;
+};
+
+typedef (BufferSource or USVString) PushMessageDataInit;
+
+dictionary PushEventInit : ExtendableEventInit {
+  PushMessageDataInit data;
+};
diff --git a/dom/webidl/PushManager.webidl b/dom/webidl/PushManager.webidl
new file mode 100644
index 0000000000..ff99e294b5
--- /dev/null
+++ b/dom/webidl/PushManager.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/.
+*
+* The origin of this IDL file is
+* https://w3c.github.io/push-api/
+*/
+
+dictionary PushSubscriptionOptionsInit {
+  // boolean userVisibleOnly = false;
+  (BufferSource or DOMString)? applicationServerKey = null;
+};
+
+// The main thread JS implementation. Please see comments in
+// dom/push/PushManager.h for the split between PushManagerImpl and PushManager.
+[JSImplementation="@mozilla.org/push/PushManager;1",
+ ChromeOnly,
+ Exposed=Window]
+interface PushManagerImpl {
+  [Throws]
+  constructor(DOMString scope);
+
+  Promise<PushSubscription>    subscribe(optional PushSubscriptionOptionsInit options = {});
+  Promise<PushSubscription?>   getSubscription();
+  Promise<PermissionState> permissionState(optional PushSubscriptionOptionsInit options = {});
+};
+
+[Exposed=(Window,Worker), Func="PushManager::IsEnabled"]
+interface PushManager {
+  [Throws, ChromeOnly]
+  constructor(DOMString scope);
+
+  [Throws, UseCounter]
+  Promise<PushSubscription>    subscribe(optional PushSubscriptionOptionsInit options = {});
+  [Throws]
+  Promise<PushSubscription?>   getSubscription();
+  [Throws]
+  Promise<PermissionState> permissionState(optional PushSubscriptionOptionsInit options = {});
+};
diff --git a/dom/webidl/PushMessageData.webidl b/dom/webidl/PushMessageData.webidl
new file mode 100644
index 0000000000..95ff374cad
--- /dev/null
+++ b/dom/webidl/PushMessageData.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/push-api/
+ */
+
+[Pref="dom.push.enabled",
+ Exposed=ServiceWorker]
+interface PushMessageData
+{
+    [Throws]
+    ArrayBuffer arrayBuffer();
+    [Throws]
+    Blob        blob();
+    [Throws]
+    any         json();
+    USVString   text();
+};
diff --git a/dom/webidl/PushSubscription.webidl b/dom/webidl/PushSubscription.webidl
new file mode 100644
index 0000000000..6acb13d10a
--- /dev/null
+++ b/dom/webidl/PushSubscription.webidl
@@ -0,0 +1,61 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/.
+*
+* The origin of this IDL file is
+* https://w3c.github.io/push-api/
+*/
+
+interface Principal;
+
+enum PushEncryptionKeyName
+{
+  "p256dh",
+  "auth"
+};
+
+dictionary PushSubscriptionKeys
+{
+  ByteString p256dh;
+  ByteString auth;
+};
+
+dictionary PushSubscriptionJSON
+{
+  USVString endpoint;
+  // FIXME: bug 1493860: should this "= {}" be here?  For that matter, this
+  // PushSubscriptionKeys thing is not even in the spec; "keys" is a record
+  // there.
+  PushSubscriptionKeys keys = {};
+  EpochTimeStamp? expirationTime;
+};
+
+dictionary PushSubscriptionInit
+{
+  required USVString endpoint;
+  required USVString scope;
+  ArrayBuffer? p256dhKey;
+  ArrayBuffer? authSecret;
+  BufferSource? appServerKey;
+  EpochTimeStamp? expirationTime = null;
+};
+
+[Exposed=(Window,Worker), Func="ServiceWorkerVisible"]
+interface PushSubscription
+{
+  [Throws, ChromeOnly]
+  constructor(PushSubscriptionInit initDict);
+
+  readonly attribute USVString endpoint;
+  readonly attribute PushSubscriptionOptions options;
+  readonly attribute EpochTimeStamp? expirationTime;
+  [Throws]
+  ArrayBuffer? getKey(PushEncryptionKeyName name);
+  [NewObject, UseCounter]
+  Promise<boolean> unsubscribe();
+
+  // Implements the custom serializer specified in Push API, section 9.
+  [Throws]
+  PushSubscriptionJSON toJSON();
+};
diff --git a/dom/webidl/PushSubscriptionOptions.webidl b/dom/webidl/PushSubscriptionOptions.webidl
new file mode 100644
index 0000000000..b0a421008f
--- /dev/null
+++ b/dom/webidl/PushSubscriptionOptions.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/.
+*
+* The origin of this IDL file is
+* https://w3c.github.io/push-api/
+*/
+
+[Exposed=(Window,Worker), Func="ServiceWorkerVisible"]
+interface PushSubscriptionOptions
+{
+  [SameObject, Throws]
+  readonly attribute ArrayBuffer? applicationServerKey;
+};
diff --git a/dom/webidl/QueuingStrategy.webidl b/dom/webidl/QueuingStrategy.webidl
new file mode 100644
index 0000000000..1ef2c30d2c
--- /dev/null
+++ b/dom/webidl/QueuingStrategy.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#qs
+ */
+
+dictionary QueuingStrategy {
+  unrestricted double highWaterMark;
+  QueuingStrategySize size;
+};
+
+callback QueuingStrategySize = unrestricted double (optional any chunk);
+
+dictionary QueuingStrategyInit {
+  required unrestricted double highWaterMark;
+};
+
+
+[Exposed=*]
+interface CountQueuingStrategy {
+  constructor(QueuingStrategyInit init);
+
+  readonly attribute unrestricted double highWaterMark;
+
+  [Throws]
+  readonly attribute Function size;
+};
+
+[Exposed=*]
+interface ByteLengthQueuingStrategy {
+  constructor(QueuingStrategyInit init);
+
+  readonly attribute unrestricted double highWaterMark;
+
+  [Throws]
+  readonly attribute Function size;
+};
diff --git a/dom/webidl/RTCCertificate.webidl b/dom/webidl/RTCCertificate.webidl
new file mode 100644
index 0000000000..ff4f0ce669
--- /dev/null
+++ b/dom/webidl/RTCCertificate.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Specification: http://w3c.github.io/webrtc-pc/#certificate-management
+ */
+
+[GenerateInit]
+dictionary RTCCertificateExpiration {
+  [EnforceRange]
+  DOMTimeStamp expires;
+};
+
+[Pref="media.peerconnection.enabled", Serializable,
+ Exposed=Window]
+interface RTCCertificate {
+  readonly attribute DOMTimeStamp expires;
+};
diff --git a/dom/webidl/RTCConfiguration.webidl b/dom/webidl/RTCConfiguration.webidl
new file mode 100644
index 0000000000..e7f08ad16a
--- /dev/null
+++ b/dom/webidl/RTCConfiguration.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCConfiguration
+ */
+
+enum RTCIceCredentialType {
+    "password",
+};
+
+dictionary RTCIceServer {
+    (DOMString or sequence<DOMString>) urls;
+    DOMString  url; //deprecated
+    DOMString username;
+    DOMString credential;
+    RTCIceCredentialType credentialType = "password";
+};
+
+enum RTCIceTransportPolicy {
+    "relay",
+    "all"
+};
+
+enum RTCBundlePolicy {
+    "balanced",
+    "max-compat",
+    "max-bundle"
+};
+
+dictionary RTCConfiguration {
+    sequence<RTCIceServer> iceServers = [];
+    RTCIceTransportPolicy  iceTransportPolicy = "all";
+    RTCBundlePolicy bundlePolicy = "balanced";
+    DOMString? peerIdentity = null;
+    sequence<RTCCertificate> certificates = [];
+
+    // Non-standard. Only here to be able to detect and warn in web console.
+    // Uses DOMString over enum as a trade-off between type errors and safety.
+    // TODO: Remove once sdpSemantics usage drops to zero (bug 1632243).
+    DOMString sdpSemantics;
+};
diff --git a/dom/webidl/RTCDTMFSender.webidl b/dom/webidl/RTCDTMFSender.webidl
new file mode 100644
index 0000000000..284ebba222
--- /dev/null
+++ b/dom/webidl/RTCDTMFSender.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://www.w3.org/TR/webrtc/#rtcdtmfsender
+ */
+
+[Exposed=Window]
+interface RTCDTMFSender : EventTarget {
+    [Throws]
+    undefined insertDTMF(DOMString tones,
+                         optional unsigned long duration = 100,
+                         optional unsigned long interToneGap = 70);
+    attribute EventHandler  ontonechange;
+    readonly attribute DOMString toneBuffer;
+};
diff --git a/dom/webidl/RTCDTMFToneChangeEvent.webidl b/dom/webidl/RTCDTMFToneChangeEvent.webidl
new file mode 100644
index 0000000000..e962820938
--- /dev/null
+++ b/dom/webidl/RTCDTMFToneChangeEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://www.w3.org/TR/webrtc/#rtcdtmftonechangeevent
+ */
+
+[Exposed=Window]
+interface RTCDTMFToneChangeEvent : Event {
+    constructor(DOMString type,
+                optional RTCDTMFToneChangeEventInit eventInitDict = {});
+
+    readonly attribute DOMString tone;
+};
+
+dictionary RTCDTMFToneChangeEventInit : EventInit {
+    DOMString tone = "";
+};
diff --git a/dom/webidl/RTCDataChannel.webidl b/dom/webidl/RTCDataChannel.webidl
new file mode 100644
index 0000000000..956458bd32
--- /dev/null
+++ b/dom/webidl/RTCDataChannel.webidl
@@ -0,0 +1,46 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum RTCDataChannelState {
+  "connecting",
+  "open",
+  "closing",
+  "closed"
+};
+
+enum RTCDataChannelType {
+  "arraybuffer",
+  "blob"
+};
+
+[Exposed=Window]
+interface RTCDataChannel : EventTarget
+{
+  readonly attribute DOMString label;
+  readonly attribute boolean negotiated;
+  readonly attribute boolean ordered;
+  readonly attribute boolean reliable;
+  readonly attribute unsigned short? maxPacketLifeTime;
+  readonly attribute unsigned short? maxRetransmits;
+  readonly attribute USVString protocol;
+  readonly attribute unsigned short? id;
+  readonly attribute RTCDataChannelState readyState;
+  readonly attribute unsigned long bufferedAmount;
+  attribute unsigned long bufferedAmountLowThreshold;
+  attribute EventHandler onopen;
+  attribute EventHandler onerror;
+  attribute EventHandler onclose;
+  undefined close();
+  attribute EventHandler onmessage;
+  attribute EventHandler onbufferedamountlow;
+  attribute RTCDataChannelType binaryType;
+  [Throws]
+  undefined send(DOMString data);
+  [Throws]
+  undefined send(Blob data);
+  [Throws]
+  undefined send(ArrayBuffer data);
+  [Throws]
+  undefined send(ArrayBufferView data);
+};
diff --git a/dom/webidl/RTCDataChannelEvent.webidl b/dom/webidl/RTCDataChannelEvent.webidl
new file mode 100644
index 0000000000..1ad7b5fdae
--- /dev/null
+++ b/dom/webidl/RTCDataChannelEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCDataChannelEvent
+ */
+
+dictionary RTCDataChannelEventInit : EventInit {
+    required RTCDataChannel channel;
+};
+
+[Pref="media.peerconnection.enabled",
+ Exposed=Window]
+interface RTCDataChannelEvent : Event {
+    constructor(DOMString type, RTCDataChannelEventInit eventInitDict);
+
+    readonly attribute RTCDataChannel channel;
+};
diff --git a/dom/webidl/RTCDtlsTransport.webidl b/dom/webidl/RTCDtlsTransport.webidl
new file mode 100644
index 0000000000..0b2f095ab6
--- /dev/null
+++ b/dom/webidl/RTCDtlsTransport.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webrtc-pc/#rtcdtlstransport-interface
+ */
+
+enum RTCDtlsTransportState {
+  "new",
+  "connecting",
+  "connected",
+  "closed",
+  "failed"
+};
+
+[Pref="media.peerconnection.enabled",
+ Exposed=Window]
+interface RTCDtlsTransport : EventTarget {
+  readonly attribute RTCDtlsTransportState state;
+  attribute EventHandler onstatechange;
+};
diff --git a/dom/webidl/RTCIceCandidate.webidl b/dom/webidl/RTCIceCandidate.webidl
new file mode 100644
index 0000000000..865b029ab9
--- /dev/null
+++ b/dom/webidl/RTCIceCandidate.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCIceCandidate
+ */
+
+dictionary RTCIceCandidateInit {
+  DOMString candidate = "";
+  DOMString? sdpMid = null;
+  unsigned short? sdpMLineIndex = null;
+  DOMString? usernameFragment = null;
+};
+
+[Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/rtcicecandidate;1",
+ Exposed=Window]
+interface RTCIceCandidate {
+  [Throws]
+  constructor(optional RTCIceCandidateInit candidateInitDict = {});
+
+  attribute DOMString       candidate;
+  attribute DOMString?      sdpMid;
+  attribute unsigned short? sdpMLineIndex;
+  attribute DOMString? usernameFragment;
+  [Default] object toJSON();
+};
diff --git a/dom/webidl/RTCIdentityAssertion.webidl b/dom/webidl/RTCIdentityAssertion.webidl
new file mode 100644
index 0000000000..621b21fed9
--- /dev/null
+++ b/dom/webidl/RTCIdentityAssertion.webidl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#idl-def-RTCIdentityAssertion
+ */
+
+dictionary RTCIdentityAssertion {
+  DOMString idp;
+  DOMString name;
+};
diff --git a/dom/webidl/RTCIdentityProvider.webidl b/dom/webidl/RTCIdentityProvider.webidl
new file mode 100644
index 0000000000..4755503276
--- /dev/null
+++ b/dom/webidl/RTCIdentityProvider.webidl
@@ -0,0 +1,65 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * http://w3c.github.io/webrtc-pc/ (with https://github.com/w3c/webrtc-pc/pull/178)
+ */
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface RTCIdentityProviderRegistrar {
+  undefined register(RTCIdentityProvider idp);
+
+  /* Whether an IdP was passed to register() to chrome code. */
+  [ChromeOnly]
+  readonly attribute boolean hasIdp;
+  /* The following two chrome-only functions forward to the corresponding
+   * function on the registered IdP.  This is necessary because the
+   * JS-implemented WebIDL can't see these functions on `idp` above, chrome JS
+   * gets an Xray onto the content code that suppresses functions, see
+   * https://developer.mozilla.org/en-US/docs/Xray_vision#Xrays_for_JavaScript_objects
+   */
+  /* Forward to idp.generateAssertion() */
+  [ChromeOnly, Throws]
+  Promise<RTCIdentityAssertionResult>
+  generateAssertion(DOMString contents, DOMString origin,
+                    optional RTCIdentityProviderOptions options = {});
+  /* Forward to idp.validateAssertion() */
+  [ChromeOnly, Throws]
+  Promise<RTCIdentityValidationResult>
+  validateAssertion(DOMString assertion, DOMString origin);
+};
+
+dictionary RTCIdentityProvider {
+  required GenerateAssertionCallback generateAssertion;
+  required ValidateAssertionCallback validateAssertion;
+};
+
+callback GenerateAssertionCallback =
+  Promise<RTCIdentityAssertionResult>
+    (DOMString contents, DOMString origin,
+     RTCIdentityProviderOptions options);
+callback ValidateAssertionCallback =
+  Promise<RTCIdentityValidationResult> (DOMString assertion, DOMString origin);
+
+dictionary RTCIdentityAssertionResult {
+  required RTCIdentityProviderDetails idp;
+  required DOMString assertion;
+};
+
+dictionary RTCIdentityProviderDetails {
+  required DOMString domain;
+  DOMString protocol = "default";
+};
+
+dictionary RTCIdentityValidationResult {
+  required DOMString identity;
+  required DOMString contents;
+};
+
+dictionary RTCIdentityProviderOptions {
+  DOMString protocol = "default";
+  DOMString usernameHint;
+  DOMString peerIdentity;
+};
diff --git a/dom/webidl/RTCPeerConnection.webidl b/dom/webidl/RTCPeerConnection.webidl
new file mode 100644
index 0000000000..6288bf4d3d
--- /dev/null
+++ b/dom/webidl/RTCPeerConnection.webidl
@@ -0,0 +1,205 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#interface-definition
+ */
+
+callback RTCSessionDescriptionCallback = undefined (RTCSessionDescriptionInit description);
+callback RTCPeerConnectionErrorCallback = undefined (DOMException error);
+callback RTCStatsCallback = undefined (RTCStatsReport report);
+
+enum RTCSignalingState {
+    "stable",
+    "have-local-offer",
+    "have-remote-offer",
+    "have-local-pranswer",
+    "have-remote-pranswer",
+    "closed"
+};
+
+enum RTCIceGatheringState {
+    "new",
+    "gathering",
+    "complete"
+};
+
+enum RTCIceConnectionState {
+    "new",
+    "checking",
+    "connected",
+    "completed",
+    "failed",
+    "disconnected",
+    "closed"
+};
+
+enum RTCPeerConnectionState {
+  "closed",
+  "failed",
+  "disconnected",
+  "new",
+  "connecting",
+  "connected"
+};
+
+enum mozPacketDumpType {
+  "rtp", // dump unencrypted rtp as the MediaPipeline sees it
+  "srtp", // dump encrypted rtp as the MediaPipeline sees it
+  "rtcp", // dump unencrypted rtcp as the MediaPipeline sees it
+  "srtcp" // dump encrypted rtcp as the MediaPipeline sees it
+};
+
+callback mozPacketCallback = undefined (unsigned long level,
+                                        mozPacketDumpType type,
+                                        boolean sending,
+                                        ArrayBuffer packet);
+
+dictionary RTCDataChannelInit {
+  boolean        ordered = true;
+  [EnforceRange]
+  unsigned short maxPacketLifeTime;
+  [EnforceRange]
+  unsigned short maxRetransmits;
+  DOMString      protocol = "";
+  boolean        negotiated = false;
+  [EnforceRange]
+  unsigned short id;
+
+  // These are deprecated due to renaming in the spec, but still supported for Fx53
+  unsigned short maxRetransmitTime;
+};
+
+dictionary RTCOfferAnswerOptions {
+//  boolean voiceActivityDetection = true; // TODO: support this (Bug 1184712)
+};
+
+dictionary RTCAnswerOptions : RTCOfferAnswerOptions {
+};
+
+dictionary RTCOfferOptions : RTCOfferAnswerOptions {
+  boolean offerToReceiveVideo;
+  boolean offerToReceiveAudio;
+  boolean iceRestart = false;
+};
+
+[Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/peerconnection;1",
+ Exposed=Window]
+interface RTCPeerConnection : EventTarget  {
+  [Throws]
+  constructor(optional RTCConfiguration configuration = {},
+              optional object? constraints);
+
+  [Throws, StaticClassOverride="mozilla::dom::RTCCertificate"]
+  static Promise<RTCCertificate> generateCertificate (AlgorithmIdentifier keygenAlgorithm);
+
+  [Pref="media.peerconnection.identity.enabled"]
+  undefined setIdentityProvider (DOMString provider,
+                                 optional RTCIdentityProviderOptions options = {});
+  [Pref="media.peerconnection.identity.enabled"]
+  Promise<DOMString> getIdentityAssertion();
+  Promise<RTCSessionDescriptionInit> createOffer (optional RTCOfferOptions options = {});
+  Promise<RTCSessionDescriptionInit> createAnswer (optional RTCAnswerOptions options = {});
+  Promise<undefined> setLocalDescription (optional RTCSessionDescriptionInit description = {});
+  Promise<undefined> setRemoteDescription (optional RTCSessionDescriptionInit description = {});
+  readonly attribute RTCSessionDescription? localDescription;
+  readonly attribute RTCSessionDescription? currentLocalDescription;
+  readonly attribute RTCSessionDescription? pendingLocalDescription;
+  readonly attribute RTCSessionDescription? remoteDescription;
+  readonly attribute RTCSessionDescription? currentRemoteDescription;
+  readonly attribute RTCSessionDescription? pendingRemoteDescription;
+  readonly attribute RTCSignalingState signalingState;
+  Promise<undefined> addIceCandidate (optional (RTCIceCandidateInit or RTCIceCandidate) candidate = {});
+  readonly attribute boolean? canTrickleIceCandidates;
+  readonly attribute RTCIceGatheringState iceGatheringState;
+  readonly attribute RTCIceConnectionState iceConnectionState;
+  readonly attribute RTCPeerConnectionState connectionState;
+  undefined restartIce ();
+  [Pref="media.peerconnection.identity.enabled"]
+  readonly attribute Promise<RTCIdentityAssertion> peerIdentity;
+  [Pref="media.peerconnection.identity.enabled"]
+  readonly attribute DOMString? idpLoginUrl;
+
+  [ChromeOnly]
+  attribute DOMString id;
+
+  RTCConfiguration      getConfiguration ();
+  undefined setConfiguration(optional RTCConfiguration configuration = {});
+  [Deprecated="RTCPeerConnectionGetStreams"]
+  sequence<MediaStream> getLocalStreams ();
+  [Deprecated="RTCPeerConnectionGetStreams"]
+  sequence<MediaStream> getRemoteStreams ();
+  undefined addStream (MediaStream stream);
+
+  // replaces addStream; fails if already added
+  // because a track can be part of multiple streams, stream parameters
+  // indicate which particular streams should be referenced in signaling
+
+  RTCRtpSender addTrack(MediaStreamTrack track,
+                        MediaStream... streams);
+  undefined removeTrack(RTCRtpSender sender);
+
+  [Throws]
+  RTCRtpTransceiver addTransceiver((MediaStreamTrack or DOMString) trackOrKind,
+                                   optional RTCRtpTransceiverInit init = {});
+
+  sequence<RTCRtpSender> getSenders();
+  sequence<RTCRtpReceiver> getReceivers();
+  sequence<RTCRtpTransceiver> getTransceivers();
+
+  [ChromeOnly]
+  undefined mozSetPacketCallback(mozPacketCallback callback);
+  [ChromeOnly]
+  undefined mozEnablePacketDump(unsigned long level,
+                                mozPacketDumpType type,
+                                boolean sending);
+  [ChromeOnly]
+  undefined mozDisablePacketDump(unsigned long level,
+                                 mozPacketDumpType type,
+                                 boolean sending);
+
+  undefined close ();
+  attribute EventHandler onnegotiationneeded;
+  attribute EventHandler onicecandidate;
+  attribute EventHandler onsignalingstatechange;
+  attribute EventHandler onaddstream; // obsolete
+  attribute EventHandler onaddtrack;  // obsolete
+  attribute EventHandler ontrack;     // replaces onaddtrack and onaddstream.
+  attribute EventHandler oniceconnectionstatechange;
+  attribute EventHandler onicegatheringstatechange;
+  attribute EventHandler onconnectionstatechange;
+
+  Promise<RTCStatsReport> getStats (optional MediaStreamTrack? selector = null);
+
+  readonly attribute RTCSctpTransport? sctp;
+  // Data channel.
+  RTCDataChannel createDataChannel (DOMString label,
+                                    optional RTCDataChannelInit dataChannelDict = {});
+  attribute EventHandler ondatachannel;
+};
+
+// Legacy callback API
+
+partial interface RTCPeerConnection {
+
+  // Dummy Promise<undefined> return values avoid "WebIDL.WebIDLError: error:
+  // We have overloads with both Promise and non-Promise return types"
+
+  Promise<undefined> createOffer (RTCSessionDescriptionCallback successCallback,
+                                  RTCPeerConnectionErrorCallback failureCallback,
+                                  optional RTCOfferOptions options = {});
+  Promise<undefined> createAnswer (RTCSessionDescriptionCallback successCallback,
+                                   RTCPeerConnectionErrorCallback failureCallback);
+  Promise<undefined> setLocalDescription (RTCSessionDescriptionInit description,
+                                          VoidFunction successCallback,
+                                          RTCPeerConnectionErrorCallback failureCallback);
+  Promise<undefined> setRemoteDescription (RTCSessionDescriptionInit description,
+                                           VoidFunction successCallback,
+                                           RTCPeerConnectionErrorCallback failureCallback);
+  Promise<undefined> addIceCandidate (RTCIceCandidate candidate,
+                                      VoidFunction successCallback,
+                                      RTCPeerConnectionErrorCallback failureCallback);
+};
diff --git a/dom/webidl/RTCPeerConnectionIceEvent.webidl b/dom/webidl/RTCPeerConnectionIceEvent.webidl
new file mode 100644
index 0000000000..ed43643b93
--- /dev/null
+++ b/dom/webidl/RTCPeerConnectionIceEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCPeerConnectionIceEvent
+ */
+
+dictionary RTCPeerConnectionIceEventInit : EventInit {
+  RTCIceCandidate? candidate = null;
+};
+
+[Pref="media.peerconnection.enabled",
+ Exposed=Window]
+interface RTCPeerConnectionIceEvent : Event {
+  constructor(DOMString type,
+              optional RTCPeerConnectionIceEventInit eventInitDict = {});
+
+  readonly attribute RTCIceCandidate? candidate;
+};
diff --git a/dom/webidl/RTCPeerConnectionStatic.webidl b/dom/webidl/RTCPeerConnectionStatic.webidl
new file mode 100644
index 0000000000..e34ca52ea6
--- /dev/null
+++ b/dom/webidl/RTCPeerConnectionStatic.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+  Right now, it is not possible to add static functions to a JS implemented
+  interface (see bug 863952), so we need to create a simple interface with a
+  trivial constructor and no data to hold these functions that really ought to
+  be static in RTCPeerConnection.
+  TODO(bcampen@mozilla.com) Merge this code into RTCPeerConnection once this
+  limitation is gone. (Bug 1017082)
+*/
+
+enum RTCLifecycleEvent {
+    "initialized",
+    "icegatheringstatechange",
+    "iceconnectionstatechange",
+    "connectionstatechange",
+};
+
+callback PeerConnectionLifecycleCallback = undefined (RTCPeerConnection pc,
+                                                      unsigned long long windowId,
+                                                      RTCLifecycleEvent eventType);
+
+[ChromeOnly,
+ Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/peerconnectionstatic;1",
+ Exposed=Window]
+interface RTCPeerConnectionStatic {
+  [Throws]
+  constructor();
+
+  /* One slot per window (the window in which the register call is made),
+     automatically unregistered when window goes away.
+     Fires when a PC is created, and whenever the ICE connection state or
+     gathering state changes. */
+  undefined registerPeerConnectionLifecycleCallback(
+    PeerConnectionLifecycleCallback cb);
+};
diff --git a/dom/webidl/RTCRtpCapabilities.webidl b/dom/webidl/RTCRtpCapabilities.webidl
new file mode 100644
index 0000000000..c88cd5b8aa
--- /dev/null
+++ b/dom/webidl/RTCRtpCapabilities.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webrtc-pc/#dom-rtcrtpcapabilities
+ */
+
+dictionary RTCRtpCapabilities {
+  required sequence<RTCRtpCodecCapability> codecs;
+  required sequence<RTCRtpHeaderExtensionCapability> headerExtensions;
+};
+
+dictionary RTCRtpCodecCapability : RTCRtpCodec {
+};
+
+dictionary RTCRtpCodec {
+  required DOMString mimeType;
+  required unsigned long clockRate;
+  unsigned short channels;
+  DOMString sdpFmtpLine;
+};
+
+dictionary RTCRtpHeaderExtensionCapability {
+  required DOMString uri;
+};
diff --git a/dom/webidl/RTCRtpParameters.webidl b/dom/webidl/RTCRtpParameters.webidl
new file mode 100644
index 0000000000..f6dbab773a
--- /dev/null
+++ b/dom/webidl/RTCRtpParameters.webidl
@@ -0,0 +1,76 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#rtcrtpsender-interface
+ */
+
+enum RTCPriorityType {
+  "very-low",
+  "low",
+  "medium",
+  "high"
+};
+
+enum RTCDegradationPreference {
+  "maintain-framerate",
+  "maintain-resolution",
+  "balanced"
+};
+
+dictionary RTCRtxParameters {
+  unsigned long ssrc;
+};
+
+dictionary RTCFecParameters {
+  unsigned long ssrc;
+};
+
+dictionary RTCRtpEncodingParameters {
+  unsigned long            ssrc;
+  RTCRtxParameters         rtx;
+  RTCFecParameters         fec;
+  boolean                  active = true;
+  // From https://www.w3.org/TR/webrtc-priority/
+  RTCPriorityType          priority = "low";
+  unsigned long            maxBitrate;
+  DOMString                rid;
+  double                   scaleResolutionDownBy;
+  // From https://w3c.github.io/webrtc-extensions/#rtcrtpencodingparameters-dictionary
+  double                   maxFramerate;
+};
+
+dictionary RTCRtpHeaderExtensionParameters {
+  DOMString      uri;
+  unsigned short id;
+  boolean        encrypted;
+};
+
+dictionary RTCRtcpParameters {
+  DOMString cname;
+  boolean   reducedSize;
+};
+
+dictionary RTCRtpCodecParameters {
+  unsigned short payloadType;
+  DOMString      mimeType;
+  unsigned long  clockRate;
+  unsigned short channels = 1;
+  DOMString      sdpFmtpLine;
+};
+
+dictionary RTCRtpParameters {
+  // We do not support these, but every wpt test involving parameters insists
+  // that these be present, regardless of whether the test-case has anything to
+  // do with these in particular (see validateRtpParameters).
+  sequence<RTCRtpHeaderExtensionParameters> headerExtensions;
+  RTCRtcpParameters                         rtcp;
+  sequence<RTCRtpCodecParameters>           codecs;
+};
+
+dictionary RTCRtpSendParameters : RTCRtpParameters {
+  DOMString transactionId;
+  required sequence<RTCRtpEncodingParameters> encodings;
+};
diff --git a/dom/webidl/RTCRtpReceiver.webidl b/dom/webidl/RTCRtpReceiver.webidl
new file mode 100644
index 0000000000..59a4f1340f
--- /dev/null
+++ b/dom/webidl/RTCRtpReceiver.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://lists.w3.org/Archives/Public/public-webrtc/2014May/0067.html
+ */
+
+[Pref="media.peerconnection.enabled",
+ Exposed=Window]
+interface RTCRtpReceiver {
+  readonly attribute MediaStreamTrack   track;
+  readonly attribute RTCDtlsTransport?  transport;
+  static RTCRtpCapabilities? getCapabilities(DOMString kind);
+  sequence<RTCRtpContributingSource>    getContributingSources();
+  sequence<RTCRtpSynchronizationSource> getSynchronizationSources();
+  [NewObject]
+  Promise<RTCStatsReport>               getStats();
+
+  // test-only: for testing getContributingSources
+  [ChromeOnly]
+  undefined mozInsertAudioLevelForContributingSource(unsigned long source,
+                                                     DOMHighResTimeStamp timestamp,
+                                                     unsigned long rtpTimestamp,
+                                                     boolean hasLevel,
+                                                     byte level);
+};
+
+//https://w3c.github.io/webrtc-extensions/#rtcrtpreceiver-jitterbuffertarget-rtcrtpreceiver-interface
+partial interface RTCRtpReceiver {
+  [Throws]
+  attribute DOMHighResTimeStamp? jitterBufferTarget;
+};
diff --git a/dom/webidl/RTCRtpSender.webidl b/dom/webidl/RTCRtpSender.webidl
new file mode 100644
index 0000000000..ea7ee741c6
--- /dev/null
+++ b/dom/webidl/RTCRtpSender.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#rtcrtpsender-interface
+ */
+
+[Pref="media.peerconnection.enabled",
+ Exposed=Window]
+interface RTCRtpSender {
+  readonly attribute MediaStreamTrack? track;
+  readonly attribute RTCDtlsTransport? transport;
+  static RTCRtpCapabilities? getCapabilities(DOMString kind);
+  [NewObject]
+  Promise<undefined> setParameters (RTCRtpSendParameters parameters);
+  RTCRtpSendParameters getParameters();
+  [Throws]
+  Promise<undefined> replaceTrack(MediaStreamTrack? withTrack);
+  [Throws]
+  undefined setStreams(MediaStream... streams);
+  [NewObject]
+  Promise<RTCStatsReport> getStats();
+  [Pref="media.peerconnection.dtmf.enabled"]
+  readonly attribute RTCDTMFSender? dtmf;
+  [ChromeOnly]
+  sequence<MediaStream> getStreams();
+  [ChromeOnly]
+  undefined setStreamsImpl(MediaStream... streams);
+  [ChromeOnly]
+  undefined setTrack(MediaStreamTrack? track);
+};
diff --git a/dom/webidl/RTCRtpSources.webidl b/dom/webidl/RTCRtpSources.webidl
new file mode 100644
index 0000000000..ec47b9df23
--- /dev/null
+++ b/dom/webidl/RTCRtpSources.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webrtc-pc/ Editor's Draft 18 January 2018
+ */
+
+dictionary RTCRtpContributingSource {
+    required DOMHighResTimeStamp timestamp;
+    required unsigned long source;
+    double audioLevel;
+    required unsigned long rtpTimestamp;
+};
+
+dictionary RTCRtpSynchronizationSource : RTCRtpContributingSource {
+    boolean? voiceActivityFlag;
+};
+
+/* Internal enum of types used by RTCRtpSourceEntry */
+enum RTCRtpSourceEntryType {
+    "contributing",
+    "synchronization",
+};
+/* Internal shared representation of Contributing and Synchronization sources */
+dictionary RTCRtpSourceEntry : RTCRtpSynchronizationSource {
+    required RTCRtpSourceEntryType sourceType;
+};
diff --git a/dom/webidl/RTCRtpTransceiver.webidl b/dom/webidl/RTCRtpTransceiver.webidl
new file mode 100644
index 0000000000..c161c8234f
--- /dev/null
+++ b/dom/webidl/RTCRtpTransceiver.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#rtcrtptransceiver-interface
+ */
+
+enum RTCRtpTransceiverDirection {
+    "sendrecv",
+    "sendonly",
+    "recvonly",
+    "inactive"
+};
+
+dictionary RTCRtpTransceiverInit {
+    RTCRtpTransceiverDirection         direction = "sendrecv";
+    sequence<MediaStream>              streams = [];
+    sequence<RTCRtpEncodingParameters> sendEncodings = [];
+};
+
+[Pref="media.peerconnection.enabled",
+ Exposed=Window]
+interface RTCRtpTransceiver {
+    readonly attribute DOMString?                  mid;
+    [SameObject]
+    readonly attribute RTCRtpSender                sender;
+    [SameObject]
+    readonly attribute RTCRtpReceiver              receiver;
+    readonly attribute boolean                     stopped;
+    [SetterThrows]
+             attribute RTCRtpTransceiverDirection  direction;
+    readonly attribute RTCRtpTransceiverDirection? currentDirection;
+
+    [Throws]
+    undefined stop();
+    // TODO: bug 1396922
+    // undefined setCodecPreferences(sequence<RTCRtpCodecCapability> codecs);
+
+    [ChromeOnly]
+    undefined setDirectionInternal(RTCRtpTransceiverDirection direction);
+
+    [ChromeOnly]
+    DOMString getKind();
+    [ChromeOnly]
+    boolean hasBeenUsedToSend();
+};
diff --git a/dom/webidl/RTCSctpTransport.webidl b/dom/webidl/RTCSctpTransport.webidl
new file mode 100644
index 0000000000..882967294a
--- /dev/null
+++ b/dom/webidl/RTCSctpTransport.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webrtc-pc/#dom-rtcsctptransport
+ */
+
+enum RTCSctpTransportState {
+  "connecting",
+  "connected",
+  "closed"
+};
+
+[Pref="media.peerconnection.enabled",
+ Exposed=Window]
+interface RTCSctpTransport : EventTarget {
+  readonly attribute RTCDtlsTransport transport;
+  readonly attribute RTCSctpTransportState state;
+  readonly attribute unrestricted double maxMessageSize;
+  readonly attribute unsigned short? maxChannels;
+  attribute EventHandler onstatechange;
+};
diff --git a/dom/webidl/RTCSessionDescription.webidl b/dom/webidl/RTCSessionDescription.webidl
new file mode 100644
index 0000000000..6cf116ff6e
--- /dev/null
+++ b/dom/webidl/RTCSessionDescription.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCSessionDescription
+ */
+
+enum RTCSdpType {
+  "offer",
+  "pranswer",
+  "answer",
+  "rollback"
+};
+
+dictionary RTCSessionDescriptionInit {
+  RTCSdpType type;
+  DOMString sdp = "";
+};
+
+[Pref="media.peerconnection.enabled",
+ JSImplementation="@mozilla.org/dom/rtcsessiondescription;1",
+ Exposed=Window]
+interface RTCSessionDescription {
+  [Throws]
+  constructor(optional RTCSessionDescriptionInit descriptionInitDict = {});
+
+  // These should be readonly, but writing causes deprecation warnings for a bit
+  attribute RTCSdpType type;
+  attribute DOMString sdp;
+
+  [Default] object toJSON();
+};
diff --git a/dom/webidl/RTCStatsReport.webidl b/dom/webidl/RTCStatsReport.webidl
new file mode 100644
index 0000000000..f10e4b56d3
--- /dev/null
+++ b/dom/webidl/RTCStatsReport.webidl
@@ -0,0 +1,334 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/2011/webrtc/editor/webrtc.html#rtcstatsreport-object
+ * http://www.w3.org/2011/04/webrtc/wiki/Stats
+ * https://www.w3.org/TR/webrtc-stats/
+ */
+
+enum RTCStatsType {
+  "codec",
+  "inbound-rtp",
+  "outbound-rtp",
+  "remote-inbound-rtp",
+  "remote-outbound-rtp",
+  "media-source",
+  "peer-connection",
+  "csrc",
+  "data-channel",
+  "session",
+  "track",
+  "transport",
+  "candidate-pair",
+  "local-candidate",
+  "remote-candidate"
+};
+
+dictionary RTCStats {
+  DOMHighResTimeStamp timestamp;
+  RTCStatsType type;
+  DOMString id;
+};
+
+dictionary RTCRtpStreamStats : RTCStats {
+  required unsigned long ssrc;
+  required DOMString kind;
+  DOMString mediaType;
+  DOMString transportId;
+  DOMString codecId;
+};
+
+dictionary RTCCodecStats : RTCStats {
+  required unsigned long payloadType;
+  RTCCodecType  codecType;
+  required DOMString     transportId;
+  required DOMString     mimeType;
+  unsigned long clockRate;
+  unsigned long channels;
+  DOMString     sdpFmtpLine;
+};
+
+enum RTCCodecType {
+  "encode",
+  "decode",
+};
+
+dictionary RTCReceivedRtpStreamStats: RTCRtpStreamStats {
+  unsigned long long packetsReceived;
+  long long packetsLost;
+  double jitter;
+  unsigned long discardedPackets; // non-standard alias for packetsDiscarded
+  unsigned long packetsDiscarded;
+};
+
+dictionary RTCInboundRtpStreamStats : RTCReceivedRtpStreamStats {
+  required DOMString trackIdentifier;
+  DOMString remoteId;
+  unsigned long framesDecoded;
+  unsigned long framesDropped;
+  unsigned long frameWidth;
+  unsigned long frameHeight;
+  double framesPerSecond;
+  unsigned long long qpSum;
+  double totalDecodeTime;
+  double totalInterFrameDelay;
+  double totalSquaredInterFrameDelay;
+  DOMHighResTimeStamp lastPacketReceivedTimestamp;
+  unsigned long long headerBytesReceived;
+  unsigned long long fecPacketsReceived;
+  unsigned long long fecPacketsDiscarded;
+  unsigned long long bytesReceived;
+  unsigned long nackCount;
+  unsigned long firCount;
+  unsigned long pliCount;
+  double totalProcessingDelay;
+  // Always missing from libwebrtc
+  // DOMHighResTimeStamp  estimatedPlayoutTimestamp;
+  double jitterBufferDelay;
+  unsigned long long jitterBufferEmittedCount;
+  unsigned long long totalSamplesReceived;
+  unsigned long long concealedSamples;
+  unsigned long long silentConcealedSamples;
+  unsigned long long concealmentEvents;
+  unsigned long long insertedSamplesForDeceleration;
+  unsigned long long removedSamplesForAcceleration;
+  double audioLevel;
+  double totalAudioEnergy;
+  double totalSamplesDuration;
+  unsigned long framesReceived;
+};
+
+dictionary RTCRemoteInboundRtpStreamStats : RTCReceivedRtpStreamStats {
+  DOMString localId;
+  double roundTripTime;
+  double totalRoundTripTime;
+  double fractionLost;
+  unsigned long long roundTripTimeMeasurements;
+};
+
+dictionary RTCSentRtpStreamStats : RTCRtpStreamStats {
+  unsigned long packetsSent;
+  unsigned long long bytesSent;
+};
+
+dictionary RTCOutboundRtpStreamStats : RTCSentRtpStreamStats {
+  DOMString remoteId;
+  unsigned long framesEncoded;
+  unsigned long long qpSum;
+  unsigned long nackCount;
+  unsigned long firCount;
+  unsigned long pliCount;
+  unsigned long long headerBytesSent;
+  unsigned long long retransmittedPacketsSent;
+  unsigned long long retransmittedBytesSent;
+  unsigned long long totalEncodedBytesTarget;
+  unsigned long frameWidth;
+  unsigned long frameHeight;
+  unsigned long framesSent;
+  unsigned long hugeFramesSent;
+  double totalEncodeTime;
+};
+
+dictionary RTCRemoteOutboundRtpStreamStats : RTCSentRtpStreamStats {
+  DOMString localId;
+  DOMHighResTimeStamp remoteTimestamp;
+};
+
+dictionary RTCMediaSourceStats : RTCStats {
+  required DOMString trackIdentifier;
+  required DOMString kind;
+};
+
+dictionary RTCPeerConnectionStats : RTCStats {
+  unsigned long dataChannelsOpened;
+  unsigned long dataChannelsClosed;
+};
+
+dictionary RTCRTPContributingSourceStats : RTCStats {
+  unsigned long contributorSsrc;
+  DOMString     inboundRtpStreamId;
+};
+
+dictionary RTCDataChannelStats : RTCStats {
+  DOMString           label;
+  DOMString           protocol;
+  long                dataChannelIdentifier;
+  // RTCTransportId is not yet implemented - Bug 1225723
+  // DOMString transportId;
+  RTCDataChannelState state;
+  unsigned long       messagesSent;
+  unsigned long long  bytesSent;
+  unsigned long       messagesReceived;
+  unsigned long long  bytesReceived;
+};
+
+enum RTCStatsIceCandidatePairState {
+  "frozen",
+  "waiting",
+  "inprogress",
+  "failed",
+  "succeeded",
+  "cancelled"
+};
+
+dictionary RTCIceCandidatePairStats : RTCStats {
+  DOMString transportId;
+  DOMString localCandidateId;
+  DOMString remoteCandidateId;
+  RTCStatsIceCandidatePairState state;
+  unsigned long long priority;
+  boolean nominated;
+  boolean writable;
+  boolean readable;
+  unsigned long long bytesSent;
+  unsigned long long bytesReceived;
+  DOMHighResTimeStamp lastPacketSentTimestamp;
+  DOMHighResTimeStamp lastPacketReceivedTimestamp;
+  boolean selected;
+  [ChromeOnly]
+  unsigned long componentId; // moz
+};
+
+enum RTCIceCandidateType {
+  "host",
+  "srflx",
+  "prflx",
+  "relay"
+};
+
+dictionary RTCIceCandidateStats : RTCStats {
+  DOMString address;
+  long port;
+  DOMString protocol;
+  RTCIceCandidateType candidateType;
+  long priority;
+  DOMString relayProtocol;
+  // Because we use this internally but don't support RTCIceCandidateStats,
+  // we need to keep the field as ChromeOnly. Bug 1225723
+  [ChromeOnly]
+  DOMString transportId;
+  [ChromeOnly]
+  DOMString proxied;
+};
+
+// This is for tracking the frame rate in about:webrtc
+dictionary RTCVideoFrameHistoryEntryInternal {
+  required unsigned long       width;
+  required unsigned long       height;
+  required unsigned long       rotationAngle;
+  required DOMHighResTimeStamp firstFrameTimestamp;
+  required DOMHighResTimeStamp lastFrameTimestamp;
+  required unsigned long long  consecutiveFrames;
+  required unsigned long       localSsrc;
+  required unsigned long       remoteSsrc;
+};
+
+// Collection over the entries for a single track for about:webrtc
+dictionary RTCVideoFrameHistoryInternal {
+  required DOMString                          trackIdentifier;
+  sequence<RTCVideoFrameHistoryEntryInternal> entries = [];
+};
+
+// Collection over the libwebrtc bandwidth estimation stats
+dictionary RTCBandwidthEstimationInternal {
+  required DOMString  trackIdentifier;
+  long                sendBandwidthBps;    // Estimated available send bandwidth
+  long                maxPaddingBps;       // Cumulative configured max padding
+  long                receiveBandwidthBps; // Estimated available receive bandwidth
+  long                pacerDelayMs;
+  long                rttMs;
+};
+
+// This is used by about:webrtc to report SDP parsing errors
+dictionary RTCSdpParsingErrorInternal {
+  required unsigned long lineNumber;
+  required DOMString     error;
+};
+
+// This is for tracking the flow of SDP for about:webrtc
+dictionary RTCSdpHistoryEntryInternal {
+  required DOMHighResTimeStamp         timestamp;
+  required boolean                     isLocal;
+  required DOMString                   sdp;
+  sequence<RTCSdpParsingErrorInternal> errors = [];
+};
+
+// This is intended to be a list of dictionaries that inherit from RTCStats
+// (with some raw ICE candidates thrown in). Unfortunately, we cannot simply
+// store a sequence<RTCStats> because of slicing. So, we have to have a
+// separate list for each type. Used in c++ gecko code.
+dictionary RTCStatsCollection {
+  sequence<RTCInboundRtpStreamStats>        inboundRtpStreamStats = [];
+  sequence<RTCOutboundRtpStreamStats>       outboundRtpStreamStats = [];
+  sequence<RTCRemoteInboundRtpStreamStats>  remoteInboundRtpStreamStats = [];
+  sequence<RTCRemoteOutboundRtpStreamStats> remoteOutboundRtpStreamStats = [];
+  sequence<RTCMediaSourceStats>             mediaSourceStats = [];
+  sequence<RTCPeerConnectionStats>          peerConnectionStats = [];
+  sequence<RTCRTPContributingSourceStats>   rtpContributingSourceStats = [];
+  sequence<RTCIceCandidatePairStats>        iceCandidatePairStats = [];
+  sequence<RTCIceCandidateStats>            iceCandidateStats = [];
+  sequence<RTCIceCandidateStats>            trickledIceCandidateStats = [];
+  sequence<RTCDataChannelStats>             dataChannelStats = [];
+  sequence<RTCCodecStats>                   codecStats = [];
+
+  // For internal use only
+  sequence<DOMString>                       rawLocalCandidates = [];
+  sequence<DOMString>                       rawRemoteCandidates = [];
+  sequence<RTCVideoFrameHistoryInternal>    videoFrameHistories = [];
+  sequence<RTCBandwidthEstimationInternal>  bandwidthEstimations = [];
+};
+
+// Details that about:webrtc can display about configured ICE servers
+dictionary RTCIceServerInternal {
+  sequence<DOMString> urls = [];
+  required boolean    credentialProvided;
+  required boolean    userNameProvided;
+};
+
+// Details that about:webrtc can display about the RTCConfiguration
+// Chrome only
+dictionary RTCConfigurationInternal {
+  RTCBundlePolicy                bundlePolicy;
+  required boolean               certificatesProvided;
+  sequence<RTCIceServerInternal> iceServers = [];
+  RTCIceTransportPolicy          iceTransportPolicy;
+  required boolean               peerIdentityProvided;
+  DOMString                      sdpSemantics;
+};
+
+dictionary RTCSdpHistoryInternal {
+  required DOMString pcid;
+  sequence<RTCSdpHistoryEntryInternal> sdpHistory = [];
+};
+
+// A collection of RTCStats dictionaries, plus some other info. Used by
+// WebrtcGlobalInformation for about:webrtc, and telemetry.
+dictionary RTCStatsReportInternal : RTCStatsCollection {
+  required DOMString                        pcid;
+  required unsigned long                    browserId;
+  RTCConfigurationInternal                  configuration;
+  DOMString                                 jsepSessionErrors;
+  // TODO demux from RTCStatsReportInternal in bug 1830824
+  sequence<RTCSdpHistoryEntryInternal>      sdpHistory = [];
+  required DOMHighResTimeStamp              timestamp;
+  double                                    callDurationMs;
+  required unsigned long                    iceRestarts;
+  required unsigned long                    iceRollbacks;
+  boolean                                   offerer; // Is the PC the offerer
+  required boolean                          closed; // Is the PC now closed
+};
+
+[Pref="media.peerconnection.enabled",
+ Exposed=Window]
+interface RTCStatsReport {
+
+  // TODO(bug 1586109): Remove this once we no longer need to be able to
+  // construct empty RTCStatsReports from JS.
+  [ChromeOnly]
+  constructor();
+
+  readonly maplike<DOMString, object>;
+};
diff --git a/dom/webidl/RTCTrackEvent.webidl b/dom/webidl/RTCTrackEvent.webidl
new file mode 100644
index 0000000000..dd251f775f
--- /dev/null
+++ b/dom/webidl/RTCTrackEvent.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://w3c.github.io/webrtc-pc/#idl-def-RTCTrackEvent
+ */
+
+dictionary RTCTrackEventInit : EventInit {
+    required RTCRtpReceiver        receiver;
+    required MediaStreamTrack      track;
+    sequence<MediaStream> streams = [];
+    required RTCRtpTransceiver     transceiver;
+};
+
+[Pref="media.peerconnection.enabled",
+ Exposed=Window]
+interface RTCTrackEvent : Event {
+    constructor(DOMString type, RTCTrackEventInit eventInitDict);
+
+    readonly        attribute RTCRtpReceiver           receiver;
+    readonly        attribute MediaStreamTrack         track;
+
+// TODO: Use FrozenArray once available. (Bug 1236777)
+//  readonly        attribute FrozenArray<MediaStream> streams;
+
+    [Frozen, Cached, Pure]
+    readonly        attribute sequence<MediaStream> streams; // workaround
+    readonly        attribute RTCRtpTransceiver transceiver;
+};
diff --git a/dom/webidl/RadioNodeList.webidl b/dom/webidl/RadioNodeList.webidl
new file mode 100644
index 0000000000..d9d500204c
--- /dev/null
+++ b/dom/webidl/RadioNodeList.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#htmlformcontrolscollection-0
+ *
+ * © Copyright 2004-2014 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface RadioNodeList : NodeList {
+  [NeedsCallerType]
+  attribute DOMString value;
+};
diff --git a/dom/webidl/Range.webidl b/dom/webidl/Range.webidl
new file mode 100644
index 0000000000..9d06ec09c7
--- /dev/null
+++ b/dom/webidl/Range.webidl
@@ -0,0 +1,96 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dom.spec.whatwg.org/#range
+ * http://domparsing.spec.whatwg.org/#dom-range-createcontextualfragment
+ * http://dvcs.w3.org/hg/csswg/raw-file/tip/cssom-view/Overview.html#extensions-to-the-range-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// Use ProbablyShortLivingWrapper so that the Range object could be deleted
+// as soon as possible, and thus slow down DOM operations less.
+[Exposed=Window, ProbablyShortLivingWrapper]
+interface Range : AbstractRange {
+  [Throws]
+  constructor();
+
+  [Throws]
+  readonly attribute Node commonAncestorContainer;
+
+  [Throws, BinaryName="setStartJS"]
+  undefined setStart(Node refNode, unsigned long offset);
+  [Throws, BinaryName="setEndJS"]
+  undefined setEnd(Node refNode, unsigned long offset);
+  [Throws, BinaryName="setStartBeforeJS"]
+  undefined setStartBefore(Node refNode);
+  [Throws, BinaryName="setStartAfterJS"]
+  undefined setStartAfter(Node refNode);
+  [Throws, BinaryName="setEndBeforeJS"]
+  undefined setEndBefore(Node refNode);
+  [Throws, BinaryName="setEndAfterJS"]
+  undefined setEndAfter(Node refNode);
+  [BinaryName="collapseJS"]
+  undefined collapse(optional boolean toStart = false);
+  [Throws, BinaryName="selectNodeJS"]
+  undefined selectNode(Node refNode);
+  [Throws, BinaryName="selectNodeContentsJS"]
+  undefined selectNodeContents(Node refNode);
+
+  const unsigned short START_TO_START = 0;
+  const unsigned short START_TO_END = 1;
+  const unsigned short END_TO_END = 2;
+  const unsigned short END_TO_START = 3;
+  [Throws]
+  short compareBoundaryPoints(unsigned short how, Range sourceRange);
+  [CEReactions, Throws]
+  undefined deleteContents();
+  [CEReactions, Throws]
+  DocumentFragment extractContents();
+  [CEReactions, Throws]
+  DocumentFragment cloneContents();
+  [CEReactions, Throws]
+  undefined insertNode(Node node);
+  [CEReactions, Throws]
+  undefined surroundContents(Node newParent);
+
+  Range cloneRange();
+  undefined detach();
+
+  [Throws]
+  boolean isPointInRange(Node node, unsigned long offset);
+  [Throws]
+  short comparePoint(Node node, unsigned long offset);
+
+  [Throws]
+  boolean intersectsNode(Node node);
+
+  [Throws, BinaryName="ToString"]
+  stringifier;
+};
+
+// http://domparsing.spec.whatwg.org/#dom-range-createcontextualfragment
+partial interface Range {
+  [CEReactions, Throws, UseCounter]
+  DocumentFragment createContextualFragment(DOMString fragment);
+};
+
+// http://dvcs.w3.org/hg/csswg/raw-file/tip/cssom-view/Overview.html#extensions-to-the-range-interface
+partial interface Range {
+  DOMRectList? getClientRects();
+  DOMRect getBoundingClientRect();
+};
+
+dictionary ClientRectsAndTexts {
+  required DOMRectList rectList;
+  required sequence<DOMString> textList;
+};
+
+partial interface Range {
+  [ChromeOnly, Throws]
+  ClientRectsAndTexts getClientRectsAndTexts();
+};
diff --git a/dom/webidl/ReadableByteStreamController.webidl b/dom/webidl/ReadableByteStreamController.webidl
new file mode 100644
index 0000000000..74dbfc4c4b
--- /dev/null
+++ b/dom/webidl/ReadableByteStreamController.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#rbs-controller-class-definition
+ */
+
+[Exposed=*]
+interface ReadableByteStreamController {
+  [Throws] // Throws on OOM
+  readonly attribute ReadableStreamBYOBRequest? byobRequest;
+
+  readonly attribute unrestricted double? desiredSize;
+
+  [Throws]
+  undefined close();
+
+  [Throws]
+  undefined enqueue(ArrayBufferView chunk);
+
+  [Throws]
+  undefined error(optional any e);
+};
diff --git a/dom/webidl/ReadableStream.webidl b/dom/webidl/ReadableStream.webidl
new file mode 100644
index 0000000000..faba17ad55
--- /dev/null
+++ b/dom/webidl/ReadableStream.webidl
@@ -0,0 +1,56 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#rs-class-definition
+ */
+
+[Exposed=*] // [Transferable] - See Bug 1562065
+interface ReadableStream {
+  [Throws]
+  constructor(optional object underlyingSource, optional QueuingStrategy strategy = {});
+
+  readonly attribute boolean locked;
+
+  [NewObject]
+  Promise<undefined> cancel(optional any reason);
+
+  [Throws]
+  ReadableStreamReader getReader(optional ReadableStreamGetReaderOptions options = {});
+
+  [Throws]
+  ReadableStream pipeThrough(ReadableWritablePair transform, optional StreamPipeOptions options = {});
+
+  [NewObject]
+  Promise<undefined> pipeTo(WritableStream destination, optional StreamPipeOptions options = {});
+
+  [Throws]
+  sequence<ReadableStream> tee();
+
+  [GenerateReturnMethod]
+  async iterable<any>(optional ReadableStreamIteratorOptions options = {});
+};
+
+enum ReadableStreamReaderMode { "byob" };
+
+dictionary ReadableStreamGetReaderOptions {
+  ReadableStreamReaderMode mode;
+};
+
+dictionary ReadableStreamIteratorOptions {
+  boolean preventCancel = false;
+};
+
+dictionary ReadableWritablePair {
+  required ReadableStream readable;
+  required WritableStream writable;
+};
+
+dictionary StreamPipeOptions {
+  boolean preventClose = false;
+  boolean preventAbort = false;
+  boolean preventCancel = false;
+  AbortSignal signal;
+};
diff --git a/dom/webidl/ReadableStreamBYOBReader.webidl b/dom/webidl/ReadableStreamBYOBReader.webidl
new file mode 100644
index 0000000000..d19167b4ad
--- /dev/null
+++ b/dom/webidl/ReadableStreamBYOBReader.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#byob-reader-class-definition
+ */
+
+[Exposed=*]
+interface ReadableStreamBYOBReader {
+  [Throws]
+  constructor(ReadableStream stream);
+
+  [NewObject]
+  Promise<ReadableStreamReadResult> read(ArrayBufferView view);
+
+  [Throws]
+  undefined releaseLock();
+};
+ReadableStreamBYOBReader includes ReadableStreamGenericReader;
diff --git a/dom/webidl/ReadableStreamBYOBRequest.webidl b/dom/webidl/ReadableStreamBYOBRequest.webidl
new file mode 100644
index 0000000000..cc9a6b0f44
--- /dev/null
+++ b/dom/webidl/ReadableStreamBYOBRequest.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#rs-byob-request-class-definition
+ */
+
+[Exposed=*]
+interface ReadableStreamBYOBRequest {
+  readonly attribute ArrayBufferView? view;
+
+  [Throws]
+  undefined respond([EnforceRange] unsigned long long bytesWritten);
+
+  [Throws]
+  undefined respondWithNewView(ArrayBufferView view);
+};
diff --git a/dom/webidl/ReadableStreamDefaultController.webidl b/dom/webidl/ReadableStreamDefaultController.webidl
new file mode 100644
index 0000000000..0964d4b1d6
--- /dev/null
+++ b/dom/webidl/ReadableStreamDefaultController.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#rs-default-controller-class-definition
+ */
+
+[Exposed=*]
+interface ReadableStreamDefaultController {
+  readonly attribute unrestricted double? desiredSize;
+
+  [Throws]
+  undefined close();
+
+  [Throws]
+  undefined enqueue(optional any chunk);
+
+  [Throws]
+  undefined error(optional any e);
+};
diff --git a/dom/webidl/ReadableStreamDefaultReader.webidl b/dom/webidl/ReadableStreamDefaultReader.webidl
new file mode 100644
index 0000000000..21a9293b0c
--- /dev/null
+++ b/dom/webidl/ReadableStreamDefaultReader.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#generic-reader-mixin-definition
+ * https://streams.spec.whatwg.org/#default-reader-class-definition
+ */
+
+typedef (ReadableStreamDefaultReader or ReadableStreamBYOBReader) ReadableStreamReader;
+
+enum ReadableStreamType { "bytes" };
+
+interface mixin ReadableStreamGenericReader {
+  readonly attribute Promise<undefined> closed;
+
+  [NewObject]
+  Promise<undefined> cancel(optional any reason);
+};
+
+[Exposed=*]
+interface ReadableStreamDefaultReader {
+  [Throws]
+  constructor(ReadableStream stream);
+
+  [NewObject]
+  Promise<ReadableStreamReadResult> read();
+
+  [Throws]
+  undefined releaseLock();
+};
+ReadableStreamDefaultReader includes ReadableStreamGenericReader;
+
+
+dictionary ReadableStreamReadResult {
+ any value;
+ boolean done;
+};
diff --git a/dom/webidl/ReferrerPolicy.webidl b/dom/webidl/ReferrerPolicy.webidl
new file mode 100644
index 0000000000..804b0ea243
--- /dev/null
+++ b/dom/webidl/ReferrerPolicy.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information please see
+ * https://w3c.github.io/webappsec-referrer-policy#idl-index
+ */
+
+enum ReferrerPolicy {
+  "",
+  "no-referrer",
+  "no-referrer-when-downgrade",
+  "origin",
+  "origin-when-cross-origin",
+  "unsafe-url", "same-origin",
+  "strict-origin",
+  "strict-origin-when-cross-origin"
+};
diff --git a/dom/webidl/Reporting.webidl b/dom/webidl/Reporting.webidl
new file mode 100644
index 0000000000..db0582411c
--- /dev/null
+++ b/dom/webidl/Reporting.webidl
@@ -0,0 +1,99 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/reporting/#interface-reporting-observer
+ */
+
+[Pref="dom.reporting.enabled",
+ Exposed=(Window,Worker)]
+interface ReportBody {
+  [Default] object toJSON
+();
+};
+
+[Pref="dom.reporting.enabled",
+ Exposed=(Window,Worker)]
+interface Report {
+  [Default] object toJSON
+();
+  readonly attribute DOMString type;
+  readonly attribute DOMString url;
+  readonly attribute ReportBody? body;
+};
+
+[Pref="dom.reporting.enabled",
+ Exposed=(Window,Worker)]
+interface ReportingObserver {
+  [Throws]
+  constructor(ReportingObserverCallback callback, optional ReportingObserverOptions options = {});
+  undefined observe();
+  undefined disconnect();
+  ReportList takeRecords();
+};
+
+callback ReportingObserverCallback = undefined (sequence<Report> reports, ReportingObserver observer);
+
+dictionary ReportingObserverOptions {
+  sequence<DOMString> types;
+  boolean buffered = false;
+};
+
+typedef sequence<Report> ReportList;
+
+[Pref="dom.reporting.enabled",
+ Exposed=Window]
+interface DeprecationReportBody : ReportBody {
+  readonly attribute DOMString id;
+  // The spec currently has Date, but that's not a type that exists in Web IDL.
+  // In any case, we always return null, so we just need _some_ nullable type
+  // here.
+  readonly attribute DOMTimeStamp? anticipatedRemoval;
+  readonly attribute DOMString message;
+  readonly attribute DOMString? sourceFile;
+  readonly attribute unsigned long? lineNumber;
+  readonly attribute unsigned long? columnNumber;
+};
+
+[Deprecated="DeprecatedTestingInterface",
+ Pref="dom.reporting.testing.enabled",
+ Exposed=(Window,DedicatedWorker)]
+interface TestingDeprecatedInterface {
+  constructor();
+
+  [Deprecated="DeprecatedTestingMethod"]
+  undefined deprecatedMethod();
+
+  [Deprecated="DeprecatedTestingAttribute"]
+  readonly attribute boolean deprecatedAttribute;
+};
+
+// Used internally to process the JSON
+[GenerateInit]
+dictionary ReportingHeaderValue {
+  sequence<ReportingItem> items;
+};
+
+// Used internally to process the JSON
+dictionary ReportingItem {
+  // This is a long.
+  any max_age;
+  // This is a sequence of ReportingEndpoint.
+  any endpoints;
+  // This is a string. If missing, the value is 'default'.
+  any group;
+  boolean include_subdomains = false;
+};
+
+// Used internally to process the JSON
+[GenerateInit]
+dictionary ReportingEndpoint {
+  // This is a string.
+  any url;
+  // This is an unsigned long.
+  any priority;
+  // This is an unsigned long.
+  any weight;
+};
diff --git a/dom/webidl/Request.webidl b/dom/webidl/Request.webidl
new file mode 100644
index 0000000000..628144c1f8
--- /dev/null
+++ b/dom/webidl/Request.webidl
@@ -0,0 +1,80 @@
+/* -*- Mode: IDL; tab-width: 1; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://fetch.spec.whatwg.org/#request-class
+ */
+
+typedef (Request or USVString) RequestInfo;
+typedef unsigned long nsContentPolicyType;
+
+[Exposed=(Window,Worker)]
+interface Request {
+  [Throws]
+  constructor(RequestInfo input, optional RequestInit init = {});
+
+  readonly attribute ByteString method;
+  readonly attribute USVString url;
+  [SameObject, BinaryName="headers_"] readonly attribute Headers headers;
+
+  readonly attribute RequestDestination destination;
+  readonly attribute USVString referrer;
+  [BinaryName="referrerPolicy_"]
+  readonly attribute ReferrerPolicy referrerPolicy;
+  readonly attribute RequestMode mode;
+  readonly attribute RequestCredentials credentials;
+  readonly attribute RequestCache cache;
+  readonly attribute RequestRedirect redirect;
+  readonly attribute DOMString integrity;
+
+  // If a main-thread fetch() promise rejects, the error passed will be a
+  // nsresult code.
+  [ChromeOnly]
+  readonly attribute boolean mozErrors;
+
+  [BinaryName="getOrCreateSignal"]
+  readonly attribute AbortSignal signal;
+
+  [Throws,
+   NewObject] Request clone();
+
+  // Bug 1124638 - Allow chrome callers to set the context.
+  [ChromeOnly]
+  undefined overrideContentPolicyType(nsContentPolicyType context);
+};
+Request includes Body;
+
+dictionary RequestInit {
+  ByteString method;
+  HeadersInit headers;
+  BodyInit? body;
+  USVString referrer;
+  ReferrerPolicy referrerPolicy;
+  RequestMode mode;
+  RequestCredentials credentials;
+  RequestCache cache;
+  RequestRedirect redirect;
+  DOMString integrity;
+
+  [ChromeOnly]
+  boolean mozErrors;
+
+  AbortSignal? signal;
+
+  [Pref="dom.fetchObserver.enabled"]
+  ObserverCallback observe;
+};
+
+enum RequestDestination {
+  "",
+  "audio", "audioworklet", "document", "embed", "font", "frame", "iframe",
+  "image", "manifest", "object", "paintworklet", "report", "script",
+  "sharedworker", "style",  "track", "video", "worker", "xslt"
+};
+
+enum RequestMode { "same-origin", "no-cors", "cors", "navigate" };
+enum RequestCredentials { "omit", "same-origin", "include" };
+enum RequestCache { "default", "no-store", "reload", "no-cache", "force-cache", "only-if-cached" };
+enum RequestRedirect { "follow", "error", "manual" };
diff --git a/dom/webidl/ResizeObserver.webidl b/dom/webidl/ResizeObserver.webidl
new file mode 100644
index 0000000000..ba91751616
--- /dev/null
+++ b/dom/webidl/ResizeObserver.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.csswg.org/resize-observer/
+ */
+
+enum ResizeObserverBoxOptions {
+    "border-box",
+    "content-box",
+    "device-pixel-content-box"
+};
+
+dictionary ResizeObserverOptions {
+    ResizeObserverBoxOptions box = "content-box";
+};
+
+[Exposed=Window]
+interface ResizeObserver {
+    [Throws]
+    constructor(ResizeObserverCallback callback);
+
+    undefined observe(Element target, optional ResizeObserverOptions options = {});
+    undefined unobserve(Element target);
+    undefined disconnect();
+};
+
+callback ResizeObserverCallback = undefined (sequence<ResizeObserverEntry> entries, ResizeObserver observer);
+
+[Exposed=Window]
+interface ResizeObserverEntry {
+    readonly attribute Element target;
+    readonly attribute DOMRectReadOnly contentRect;
+    // We are using [Pure, Cached, Frozen] sequence until `FrozenArray` is implemented.
+    // See https://bugzilla.mozilla.org/show_bug.cgi?id=1236777 for more details.
+    [Frozen, Cached, Pure]
+    readonly attribute sequence<ResizeObserverSize> borderBoxSize;
+    [Frozen, Cached, Pure]
+    readonly attribute sequence<ResizeObserverSize> contentBoxSize;
+    [Frozen, Cached, Pure]
+    readonly attribute sequence<ResizeObserverSize> devicePixelContentBoxSize;
+};
+
+[Exposed=Window]
+interface ResizeObserverSize {
+    readonly attribute unrestricted double inlineSize;
+    readonly attribute unrestricted double blockSize;
+};
diff --git a/dom/webidl/Response.webidl b/dom/webidl/Response.webidl
new file mode 100644
index 0000000000..d04453c37c
--- /dev/null
+++ b/dom/webidl/Response.webidl
@@ -0,0 +1,57 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://fetch.spec.whatwg.org/#response-class
+ */
+
+[Exposed=(Window,Worker)]
+interface Response {
+  // This should be constructor(optional BodyInit... but BodyInit doesn't
+  // include ReadableStream yet because we don't want to expose Streams API to
+  // Request.
+  [Throws]
+  constructor(optional (Blob or BufferSource or FormData or URLSearchParams or ReadableStream or USVString)? body = null,
+              optional ResponseInit init = {});
+
+  [NewObject] static Response error();
+  [Throws,
+   NewObject] static Response redirect(USVString url, optional unsigned short status = 302);
+  [BinaryName=CreateFromJson, Throws,
+   NewObject] static Response json(any data, optional ResponseInit init = {});
+
+  readonly attribute ResponseType type;
+
+  readonly attribute USVString url;
+  readonly attribute boolean redirected;
+  readonly attribute unsigned short status;
+  readonly attribute boolean ok;
+  readonly attribute ByteString statusText;
+  [SameObject, BinaryName="headers_"] readonly attribute Headers headers;
+
+  [Throws,
+   NewObject] Response clone();
+
+  [ChromeOnly, NewObject, Throws] Response cloneUnfiltered();
+
+  // For testing only.
+  [ChromeOnly] readonly attribute boolean hasCacheInfoChannel;
+};
+Response includes Body;
+
+// This should be part of Body but we don't want to expose body to request yet.
+// See bug 1387483.
+partial interface Response {
+  [GetterThrows]
+  readonly attribute ReadableStream? body;
+};
+
+dictionary ResponseInit {
+  unsigned short status = 200;
+  ByteString statusText = "";
+  HeadersInit headers;
+};
+
+enum ResponseType { "basic", "cors", "default", "error", "opaque", "opaqueredirect" };
diff --git a/dom/webidl/SVGAElement.webidl b/dom/webidl/SVGAElement.webidl
new file mode 100644
index 0000000000..94363513ea
--- /dev/null
+++ b/dom/webidl/SVGAElement.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAElement : SVGGraphicsElement {
+  readonly attribute SVGAnimatedString target;
+
+  [SetterThrows]
+  attribute DOMString download;
+  [SetterThrows]
+  attribute DOMString ping;
+  [SetterThrows]
+  attribute DOMString rel;
+  [SetterThrows]
+  attribute DOMString referrerPolicy;
+  [PutForwards=value]
+  readonly attribute DOMTokenList relList;
+  [SetterThrows]
+  attribute DOMString hreflang;
+  [SetterThrows]
+  attribute DOMString type;
+
+  [Throws]
+  attribute DOMString text;
+};
+
+SVGAElement includes SVGURIReference;
diff --git a/dom/webidl/SVGAngle.webidl b/dom/webidl/SVGAngle.webidl
new file mode 100644
index 0000000000..9535831daa
--- /dev/null
+++ b/dom/webidl/SVGAngle.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAngle {
+
+  // Angle Unit Types
+  const unsigned short SVG_ANGLETYPE_UNKNOWN = 0;
+  const unsigned short SVG_ANGLETYPE_UNSPECIFIED = 1;
+  const unsigned short SVG_ANGLETYPE_DEG = 2;
+  const unsigned short SVG_ANGLETYPE_RAD = 3;
+  const unsigned short SVG_ANGLETYPE_GRAD = 4;
+
+  readonly attribute unsigned short unitType;
+           [SetterThrows]
+           attribute float value;
+           [SetterThrows]
+           attribute float valueInSpecifiedUnits;
+           [SetterThrows]
+           attribute DOMString valueAsString;
+
+  [Throws]
+  undefined newValueSpecifiedUnits(unsigned short unitType, float valueInSpecifiedUnits);
+  [Throws]
+  undefined convertToSpecifiedUnits(unsigned short unitType);
+};
diff --git a/dom/webidl/SVGAnimateElement.webidl b/dom/webidl/SVGAnimateElement.webidl
new file mode 100644
index 0000000000..24204801bf
--- /dev/null
+++ b/dom/webidl/SVGAnimateElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimateElement : SVGAnimationElement {
+};
diff --git a/dom/webidl/SVGAnimateMotionElement.webidl b/dom/webidl/SVGAnimateMotionElement.webidl
new file mode 100644
index 0000000000..e6485347de
--- /dev/null
+++ b/dom/webidl/SVGAnimateMotionElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimateMotionElement : SVGAnimationElement {
+};
diff --git a/dom/webidl/SVGAnimateTransformElement.webidl b/dom/webidl/SVGAnimateTransformElement.webidl
new file mode 100644
index 0000000000..6a08e23b14
--- /dev/null
+++ b/dom/webidl/SVGAnimateTransformElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimateTransformElement : SVGAnimationElement {
+};
diff --git a/dom/webidl/SVGAnimatedAngle.webidl b/dom/webidl/SVGAnimatedAngle.webidl
new file mode 100644
index 0000000000..082662fb9f
--- /dev/null
+++ b/dom/webidl/SVGAnimatedAngle.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedAngle {
+  [Constant]
+  readonly attribute SVGAngle baseVal;
+  [Constant]
+  readonly attribute SVGAngle animVal;
+};
diff --git a/dom/webidl/SVGAnimatedBoolean.webidl b/dom/webidl/SVGAnimatedBoolean.webidl
new file mode 100644
index 0000000000..17007fd544
--- /dev/null
+++ b/dom/webidl/SVGAnimatedBoolean.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedBoolean {
+           attribute boolean baseVal;
+  readonly attribute boolean animVal;
+};
diff --git a/dom/webidl/SVGAnimatedEnumeration.webidl b/dom/webidl/SVGAnimatedEnumeration.webidl
new file mode 100644
index 0000000000..58597a54a3
--- /dev/null
+++ b/dom/webidl/SVGAnimatedEnumeration.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/types.html#InterfaceSVGAnimatedEnumeration
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedEnumeration {
+  [SetterThrows]
+           attribute unsigned short baseVal;
+  readonly attribute unsigned short animVal;
+};
diff --git a/dom/webidl/SVGAnimatedInteger.webidl b/dom/webidl/SVGAnimatedInteger.webidl
new file mode 100644
index 0000000000..f1eee2b5ee
--- /dev/null
+++ b/dom/webidl/SVGAnimatedInteger.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/types.html#InterfaceSVGAnimatedInteger
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedInteger {
+           attribute long baseVal;
+  readonly attribute long animVal;
+};
diff --git a/dom/webidl/SVGAnimatedLength.webidl b/dom/webidl/SVGAnimatedLength.webidl
new file mode 100644
index 0000000000..69f9bb0e6f
--- /dev/null
+++ b/dom/webidl/SVGAnimatedLength.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedLength {
+  [Constant]
+  readonly attribute SVGLength baseVal;
+  [Constant]
+  readonly attribute SVGLength animVal;
+};
diff --git a/dom/webidl/SVGAnimatedLengthList.webidl b/dom/webidl/SVGAnimatedLengthList.webidl
new file mode 100644
index 0000000000..8e1b24ae2f
--- /dev/null
+++ b/dom/webidl/SVGAnimatedLengthList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedLengthList {
+  [Constant]
+  readonly attribute SVGLengthList baseVal;
+  [Constant]
+  readonly attribute SVGLengthList animVal;
+};
diff --git a/dom/webidl/SVGAnimatedNumber.webidl b/dom/webidl/SVGAnimatedNumber.webidl
new file mode 100644
index 0000000000..31f6f06d55
--- /dev/null
+++ b/dom/webidl/SVGAnimatedNumber.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/types.html#InterfaceSVGAnimatedNumber
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved.
+ * W3C liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedNumber {
+           attribute float baseVal;
+  readonly attribute float animVal;
+};
diff --git a/dom/webidl/SVGAnimatedNumberList.webidl b/dom/webidl/SVGAnimatedNumberList.webidl
new file mode 100644
index 0000000000..dc7b975d38
--- /dev/null
+++ b/dom/webidl/SVGAnimatedNumberList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedNumberList {
+  [Constant]
+  readonly attribute SVGNumberList baseVal;
+  [Constant]
+  readonly attribute SVGNumberList animVal;
+};
diff --git a/dom/webidl/SVGAnimatedPathData.webidl b/dom/webidl/SVGAnimatedPathData.webidl
new file mode 100644
index 0000000000..45e544a65b
--- /dev/null
+++ b/dom/webidl/SVGAnimatedPathData.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin SVGAnimatedPathData {
+  [Pref="dom.svg.pathSeg.enabled"]
+  readonly attribute SVGPathSegList pathSegList;
+  [Pref="dom.svg.pathSeg.enabled"]
+  readonly attribute SVGPathSegList animatedPathSegList;
+};
diff --git a/dom/webidl/SVGAnimatedPoints.webidl b/dom/webidl/SVGAnimatedPoints.webidl
new file mode 100644
index 0000000000..633549a68d
--- /dev/null
+++ b/dom/webidl/SVGAnimatedPoints.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin SVGAnimatedPoints {
+  [Constant]
+  readonly attribute SVGPointList points;
+  [Constant]
+  readonly attribute SVGPointList animatedPoints;
+};
diff --git a/dom/webidl/SVGAnimatedPreserveAspectRatio.webidl b/dom/webidl/SVGAnimatedPreserveAspectRatio.webidl
new file mode 100644
index 0000000000..f0872d5263
--- /dev/null
+++ b/dom/webidl/SVGAnimatedPreserveAspectRatio.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedPreserveAspectRatio {
+  [Constant]
+  readonly attribute SVGPreserveAspectRatio baseVal;
+  [Constant]
+  readonly attribute SVGPreserveAspectRatio animVal;
+};
diff --git a/dom/webidl/SVGAnimatedRect.webidl b/dom/webidl/SVGAnimatedRect.webidl
new file mode 100644
index 0000000000..ebfd707f79
--- /dev/null
+++ b/dom/webidl/SVGAnimatedRect.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedRect {
+  readonly attribute SVGRect? baseVal;
+  readonly attribute SVGRect? animVal;
+};
diff --git a/dom/webidl/SVGAnimatedString.webidl b/dom/webidl/SVGAnimatedString.webidl
new file mode 100644
index 0000000000..5a28bfd805
--- /dev/null
+++ b/dom/webidl/SVGAnimatedString.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedString {
+           attribute DOMString baseVal;
+  readonly attribute DOMString animVal;
+};
diff --git a/dom/webidl/SVGAnimatedTransformList.webidl b/dom/webidl/SVGAnimatedTransformList.webidl
new file mode 100644
index 0000000000..0de2cb2251
--- /dev/null
+++ b/dom/webidl/SVGAnimatedTransformList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimatedTransformList {
+  [Constant]
+  readonly attribute SVGTransformList baseVal;
+  [Constant]
+  readonly attribute SVGTransformList animVal;
+};
diff --git a/dom/webidl/SVGAnimationElement.webidl b/dom/webidl/SVGAnimationElement.webidl
new file mode 100644
index 0000000000..71502fa3f1
--- /dev/null
+++ b/dom/webidl/SVGAnimationElement.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGAnimationElement : SVGElement {
+
+  readonly attribute SVGElement? targetElement;
+
+  attribute EventHandler onbegin;
+  attribute EventHandler onend;
+  attribute EventHandler onrepeat;
+
+  [Throws]
+  float getStartTime();
+  [BinaryName="getCurrentTimeAsFloat"]
+  float getCurrentTime();
+  [Throws]
+  float getSimpleDuration();
+
+  [Throws]
+  undefined beginElement();
+  [Throws]
+  undefined beginElementAt(float offset);
+  [Throws]
+  undefined endElement();
+  [Throws]
+  undefined endElementAt(float offset);
+};
+
+SVGAnimationElement includes SVGTests;
diff --git a/dom/webidl/SVGCircleElement.webidl b/dom/webidl/SVGCircleElement.webidl
new file mode 100644
index 0000000000..06aee7da29
--- /dev/null
+++ b/dom/webidl/SVGCircleElement.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGCircleElement : SVGGeometryElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength cx;
+  [Constant]
+  readonly attribute SVGAnimatedLength cy;
+  [Constant]
+  readonly attribute SVGAnimatedLength r;
+};
diff --git a/dom/webidl/SVGClipPathElement.webidl b/dom/webidl/SVGClipPathElement.webidl
new file mode 100644
index 0000000000..5ed5adc39d
--- /dev/null
+++ b/dom/webidl/SVGClipPathElement.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGClipPathElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration clipPathUnits;
+  [Constant]
+  readonly attribute SVGAnimatedTransformList transform;
+};
diff --git a/dom/webidl/SVGComponentTransferFunctionElement.webidl b/dom/webidl/SVGComponentTransferFunctionElement.webidl
new file mode 100644
index 0000000000..e24c8f499e
--- /dev/null
+++ b/dom/webidl/SVGComponentTransferFunctionElement.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGComponentTransferFunctionElement : SVGElement {
+  // Component Transfer Types
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY = 1;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_TABLE = 2;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE = 3;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_LINEAR = 4;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_GAMMA = 5;
+
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration type;
+  [Constant]
+  readonly attribute SVGAnimatedNumberList tableValues;
+  [Constant]
+  readonly attribute SVGAnimatedNumber slope;
+  [Constant]
+  readonly attribute SVGAnimatedNumber intercept;
+  [Constant]
+  readonly attribute SVGAnimatedNumber amplitude;
+  [Constant]
+  readonly attribute SVGAnimatedNumber exponent;
+  [Constant]
+  readonly attribute SVGAnimatedNumber offset;
+};
diff --git a/dom/webidl/SVGDefsElement.webidl b/dom/webidl/SVGDefsElement.webidl
new file mode 100644
index 0000000000..5f21ff7674
--- /dev/null
+++ b/dom/webidl/SVGDefsElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGDefsElement : SVGGraphicsElement {
+};
diff --git a/dom/webidl/SVGDescElement.webidl b/dom/webidl/SVGDescElement.webidl
new file mode 100644
index 0000000000..7a2a4668fd
--- /dev/null
+++ b/dom/webidl/SVGDescElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGDescElement : SVGElement {
+};
diff --git a/dom/webidl/SVGElement.webidl b/dom/webidl/SVGElement.webidl
new file mode 100644
index 0000000000..7d2e6022f4
--- /dev/null
+++ b/dom/webidl/SVGElement.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGElement : Element {
+           attribute DOMString id;
+
+  [Constant]
+  readonly attribute SVGAnimatedString className;
+
+  readonly attribute SVGSVGElement? ownerSVGElement;
+  readonly attribute SVGElement? viewportElement;
+
+  attribute DOMString nonce;
+};
+
+SVGElement includes GlobalEventHandlers;
+SVGElement includes HTMLOrForeignElement;
+SVGElement includes ElementCSSInlineStyle;
+SVGElement includes TouchEventHandlers;
+SVGElement includes OnErrorEventHandlerForNodes;
diff --git a/dom/webidl/SVGEllipseElement.webidl b/dom/webidl/SVGEllipseElement.webidl
new file mode 100644
index 0000000000..e18a841086
--- /dev/null
+++ b/dom/webidl/SVGEllipseElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGEllipseElement : SVGGeometryElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength cx;
+  [Constant]
+  readonly attribute SVGAnimatedLength cy;
+  [Constant]
+  readonly attribute SVGAnimatedLength rx;
+  [Constant]
+  readonly attribute SVGAnimatedLength ry;
+};
diff --git a/dom/webidl/SVGFEBlendElement.webidl b/dom/webidl/SVGFEBlendElement.webidl
new file mode 100644
index 0000000000..9a2590d724
--- /dev/null
+++ b/dom/webidl/SVGFEBlendElement.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEBlendElement : SVGElement {
+
+  // Blend Mode Types
+  const unsigned short SVG_FEBLEND_MODE_UNKNOWN = 0;
+  const unsigned short SVG_FEBLEND_MODE_NORMAL = 1;
+  const unsigned short SVG_FEBLEND_MODE_MULTIPLY = 2;
+  const unsigned short SVG_FEBLEND_MODE_SCREEN = 3;
+  const unsigned short SVG_FEBLEND_MODE_DARKEN = 4;
+  const unsigned short SVG_FEBLEND_MODE_LIGHTEN = 5;
+  const unsigned short SVG_FEBLEND_MODE_OVERLAY = 6;
+  const unsigned short SVG_FEBLEND_MODE_COLOR_DODGE = 7;
+  const unsigned short SVG_FEBLEND_MODE_COLOR_BURN = 8;
+  const unsigned short SVG_FEBLEND_MODE_HARD_LIGHT = 9;
+  const unsigned short SVG_FEBLEND_MODE_SOFT_LIGHT = 10;
+  const unsigned short SVG_FEBLEND_MODE_DIFFERENCE = 11;
+  const unsigned short SVG_FEBLEND_MODE_EXCLUSION = 12;
+  const unsigned short SVG_FEBLEND_MODE_HUE = 13;
+  const unsigned short SVG_FEBLEND_MODE_SATURATION = 14;
+  const unsigned short SVG_FEBLEND_MODE_COLOR = 15;
+  const unsigned short SVG_FEBLEND_MODE_LUMINOSITY = 16;
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedString in2;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration mode;
+};
+
+SVGFEBlendElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEColorMatrixElement.webidl b/dom/webidl/SVGFEColorMatrixElement.webidl
new file mode 100644
index 0000000000..a067a574fe
--- /dev/null
+++ b/dom/webidl/SVGFEColorMatrixElement.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEColorMatrixElement : SVGElement {
+
+  // Color Matrix Types
+  const unsigned short SVG_FECOLORMATRIX_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_MATRIX = 1;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_SATURATE = 2;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_HUEROTATE = 3;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA = 4;
+
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration type;
+  [Constant]
+  readonly attribute SVGAnimatedNumberList values;
+};
+
+SVGFEColorMatrixElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEComponentTransferElement.webidl b/dom/webidl/SVGFEComponentTransferElement.webidl
new file mode 100644
index 0000000000..cdd472e5f6
--- /dev/null
+++ b/dom/webidl/SVGFEComponentTransferElement.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEComponentTransferElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+};
+
+SVGFEComponentTransferElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFECompositeElement.webidl b/dom/webidl/SVGFECompositeElement.webidl
new file mode 100644
index 0000000000..04862bf5a9
--- /dev/null
+++ b/dom/webidl/SVGFECompositeElement.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFECompositeElement : SVGElement {
+
+  // Composite Operators
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_UNKNOWN = 0;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_OVER = 1;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_IN = 2;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_OUT = 3;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_ATOP = 4;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_XOR = 5;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_ARITHMETIC = 6;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_LIGHTER = 7;
+
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedString in2;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration operator;
+  [Constant]
+  readonly attribute SVGAnimatedNumber k1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber k2;
+  [Constant]
+  readonly attribute SVGAnimatedNumber k3;
+  [Constant]
+  readonly attribute SVGAnimatedNumber k4;
+};
+
+SVGFECompositeElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEConvolveMatrixElement.webidl b/dom/webidl/SVGFEConvolveMatrixElement.webidl
new file mode 100644
index 0000000000..13b7606568
--- /dev/null
+++ b/dom/webidl/SVGFEConvolveMatrixElement.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEConvolveMatrixElement : SVGElement {
+
+  // Edge Mode Values
+  const unsigned short SVG_EDGEMODE_UNKNOWN = 0;
+  const unsigned short SVG_EDGEMODE_DUPLICATE = 1;
+  const unsigned short SVG_EDGEMODE_WRAP = 2;
+  const unsigned short SVG_EDGEMODE_NONE = 3;
+
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedInteger orderX;
+  [Constant]
+  readonly attribute SVGAnimatedInteger orderY;
+  [Constant]
+  readonly attribute SVGAnimatedNumberList kernelMatrix;
+  [Constant]
+  readonly attribute SVGAnimatedNumber divisor;
+  [Constant]
+  readonly attribute SVGAnimatedNumber bias;
+  [Constant]
+  readonly attribute SVGAnimatedInteger targetX;
+  [Constant]
+  readonly attribute SVGAnimatedInteger targetY;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration edgeMode;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthY;
+  [Constant]
+  readonly attribute SVGAnimatedBoolean preserveAlpha;
+};
+
+SVGFEConvolveMatrixElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEDiffuseLightingElement.webidl b/dom/webidl/SVGFEDiffuseLightingElement.webidl
new file mode 100644
index 0000000000..17429cb874
--- /dev/null
+++ b/dom/webidl/SVGFEDiffuseLightingElement.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEDiffuseLightingElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber surfaceScale;
+  [Constant]
+  readonly attribute SVGAnimatedNumber diffuseConstant;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthY;
+};
+
+SVGFEDiffuseLightingElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEDisplacementMapElement.webidl b/dom/webidl/SVGFEDisplacementMapElement.webidl
new file mode 100644
index 0000000000..05eb550911
--- /dev/null
+++ b/dom/webidl/SVGFEDisplacementMapElement.webidl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEDisplacementMapElement : SVGElement {
+
+  // Channel Selectors
+  const unsigned short SVG_CHANNEL_UNKNOWN = 0;
+  const unsigned short SVG_CHANNEL_R = 1;
+  const unsigned short SVG_CHANNEL_G = 2;
+  const unsigned short SVG_CHANNEL_B = 3;
+  const unsigned short SVG_CHANNEL_A = 4;
+
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedString in2;
+  [Constant]
+  readonly attribute SVGAnimatedNumber scale;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration xChannelSelector;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration yChannelSelector;
+};
+
+SVGFEDisplacementMapElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEDistantLightElement.webidl b/dom/webidl/SVGFEDistantLightElement.webidl
new file mode 100644
index 0000000000..09576510d1
--- /dev/null
+++ b/dom/webidl/SVGFEDistantLightElement.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEDistantLightElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedNumber azimuth;
+  [Constant]
+  readonly attribute SVGAnimatedNumber elevation;
+};
diff --git a/dom/webidl/SVGFEDropShadowElement.webidl b/dom/webidl/SVGFEDropShadowElement.webidl
new file mode 100644
index 0000000000..3dd29d53fc
--- /dev/null
+++ b/dom/webidl/SVGFEDropShadowElement.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEDropShadowElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber dx;
+  [Constant]
+  readonly attribute SVGAnimatedNumber dy;
+  [Constant]
+  readonly attribute SVGAnimatedNumber stdDeviationX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber stdDeviationY;
+
+  undefined setStdDeviation(float stdDeviationX, float stdDeviationY);
+};
+
+SVGFEDropShadowElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEFloodElement.webidl b/dom/webidl/SVGFEFloodElement.webidl
new file mode 100644
index 0000000000..7130c23bfc
--- /dev/null
+++ b/dom/webidl/SVGFEFloodElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEFloodElement : SVGElement {
+};
+
+SVGFEFloodElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEFuncAElement.webidl b/dom/webidl/SVGFEFuncAElement.webidl
new file mode 100644
index 0000000000..d51583a5a8
--- /dev/null
+++ b/dom/webidl/SVGFEFuncAElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEFuncAElement : SVGComponentTransferFunctionElement {
+};
diff --git a/dom/webidl/SVGFEFuncBElement.webidl b/dom/webidl/SVGFEFuncBElement.webidl
new file mode 100644
index 0000000000..c88f91e8bb
--- /dev/null
+++ b/dom/webidl/SVGFEFuncBElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEFuncBElement : SVGComponentTransferFunctionElement {
+};
diff --git a/dom/webidl/SVGFEFuncGElement.webidl b/dom/webidl/SVGFEFuncGElement.webidl
new file mode 100644
index 0000000000..683cee3ad6
--- /dev/null
+++ b/dom/webidl/SVGFEFuncGElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEFuncGElement : SVGComponentTransferFunctionElement {
+};
diff --git a/dom/webidl/SVGFEFuncRElement.webidl b/dom/webidl/SVGFEFuncRElement.webidl
new file mode 100644
index 0000000000..1a27924a8d
--- /dev/null
+++ b/dom/webidl/SVGFEFuncRElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEFuncRElement : SVGComponentTransferFunctionElement {
+};
diff --git a/dom/webidl/SVGFEGaussianBlurElement.webidl b/dom/webidl/SVGFEGaussianBlurElement.webidl
new file mode 100644
index 0000000000..1abae94dcd
--- /dev/null
+++ b/dom/webidl/SVGFEGaussianBlurElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEGaussianBlurElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber stdDeviationX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber stdDeviationY;
+
+  undefined setStdDeviation(float stdDeviationX, float stdDeviationY);
+};
+
+SVGFEGaussianBlurElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEImageElement.webidl b/dom/webidl/SVGFEImageElement.webidl
new file mode 100644
index 0000000000..e6f4519195
--- /dev/null
+++ b/dom/webidl/SVGFEImageElement.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEImageElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+  [SetterThrows]
+  attribute DOMString? crossOrigin;
+};
+
+SVGFEImageElement includes SVGFilterPrimitiveStandardAttributes;
+SVGFEImageElement includes SVGURIReference;
diff --git a/dom/webidl/SVGFEMergeElement.webidl b/dom/webidl/SVGFEMergeElement.webidl
new file mode 100644
index 0000000000..855df10d96
--- /dev/null
+++ b/dom/webidl/SVGFEMergeElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEMergeElement : SVGElement {
+};
+
+SVGFEMergeElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEMergeNodeElement.webidl b/dom/webidl/SVGFEMergeNodeElement.webidl
new file mode 100644
index 0000000000..f680fc5495
--- /dev/null
+++ b/dom/webidl/SVGFEMergeNodeElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEMergeNodeElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+};
diff --git a/dom/webidl/SVGFEMorphologyElement.webidl b/dom/webidl/SVGFEMorphologyElement.webidl
new file mode 100644
index 0000000000..8126028e66
--- /dev/null
+++ b/dom/webidl/SVGFEMorphologyElement.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEMorphologyElement : SVGElement {
+
+  // Morphology Operators
+  const unsigned short SVG_MORPHOLOGY_OPERATOR_UNKNOWN = 0;
+  const unsigned short SVG_MORPHOLOGY_OPERATOR_ERODE = 1;
+  const unsigned short SVG_MORPHOLOGY_OPERATOR_DILATE = 2;
+
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration operator;
+  [Constant]
+  readonly attribute SVGAnimatedNumber radiusX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber radiusY;
+};
+
+SVGFEMorphologyElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEOffsetElement.webidl b/dom/webidl/SVGFEOffsetElement.webidl
new file mode 100644
index 0000000000..2371813ea4
--- /dev/null
+++ b/dom/webidl/SVGFEOffsetElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEOffsetElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber dx;
+  [Constant]
+  readonly attribute SVGAnimatedNumber dy;
+};
+
+SVGFEOffsetElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFEPointLightElement.webidl b/dom/webidl/SVGFEPointLightElement.webidl
new file mode 100644
index 0000000000..50c4d5af62
--- /dev/null
+++ b/dom/webidl/SVGFEPointLightElement.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFEPointLightElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedNumber x;
+  [Constant]
+  readonly attribute SVGAnimatedNumber y;
+  [Constant]
+  readonly attribute SVGAnimatedNumber z;
+};
diff --git a/dom/webidl/SVGFESpecularLightingElement.webidl b/dom/webidl/SVGFESpecularLightingElement.webidl
new file mode 100644
index 0000000000..2c456f7c2b
--- /dev/null
+++ b/dom/webidl/SVGFESpecularLightingElement.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFESpecularLightingElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+  [Constant]
+  readonly attribute SVGAnimatedNumber surfaceScale;
+  [Constant]
+  readonly attribute SVGAnimatedNumber specularConstant;
+  [Constant]
+  readonly attribute SVGAnimatedNumber specularExponent;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber kernelUnitLengthY;
+};
+
+SVGFESpecularLightingElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFESpotLightElement.webidl b/dom/webidl/SVGFESpotLightElement.webidl
new file mode 100644
index 0000000000..6735123375
--- /dev/null
+++ b/dom/webidl/SVGFESpotLightElement.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFESpotLightElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedNumber x;
+  [Constant]
+  readonly attribute SVGAnimatedNumber y;
+  [Constant]
+  readonly attribute SVGAnimatedNumber z;
+  [Constant]
+  readonly attribute SVGAnimatedNumber pointsAtX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber pointsAtY;
+  [Constant]
+  readonly attribute SVGAnimatedNumber pointsAtZ;
+  [Constant]
+  readonly attribute SVGAnimatedNumber specularExponent;
+  [Constant]
+  readonly attribute SVGAnimatedNumber limitingConeAngle;
+};
diff --git a/dom/webidl/SVGFETileElement.webidl b/dom/webidl/SVGFETileElement.webidl
new file mode 100644
index 0000000000..2571982dc7
--- /dev/null
+++ b/dom/webidl/SVGFETileElement.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFETileElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedString in1;
+};
+
+SVGFETileElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFETurbulenceElement.webidl b/dom/webidl/SVGFETurbulenceElement.webidl
new file mode 100644
index 0000000000..ad592c84e9
--- /dev/null
+++ b/dom/webidl/SVGFETurbulenceElement.webidl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFETurbulenceElement : SVGElement {
+
+  // Turbulence Types
+  const unsigned short SVG_TURBULENCE_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_TURBULENCE_TYPE_FRACTALNOISE = 1;
+  const unsigned short SVG_TURBULENCE_TYPE_TURBULENCE = 2;
+
+  // Stitch Options
+  const unsigned short SVG_STITCHTYPE_UNKNOWN = 0;
+  const unsigned short SVG_STITCHTYPE_STITCH = 1;
+  const unsigned short SVG_STITCHTYPE_NOSTITCH = 2;
+
+  [Constant]
+  readonly attribute SVGAnimatedNumber baseFrequencyX;
+  [Constant]
+  readonly attribute SVGAnimatedNumber baseFrequencyY;
+  [Constant]
+  readonly attribute SVGAnimatedInteger numOctaves;
+  [Constant]
+  readonly attribute SVGAnimatedNumber seed;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration stitchTiles;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration type;
+};
+
+SVGFETurbulenceElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/dom/webidl/SVGFilterElement.webidl b/dom/webidl/SVGFilterElement.webidl
new file mode 100644
index 0000000000..42bfd09aee
--- /dev/null
+++ b/dom/webidl/SVGFilterElement.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGFilterElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration filterUnits;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration primitiveUnits;
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+
+  // ImageData apply(ImageData source);
+};
+
+SVGFilterElement includes SVGURIReference;
diff --git a/dom/webidl/SVGFilterPrimitiveStandardAttributes.webidl b/dom/webidl/SVGFilterPrimitiveStandardAttributes.webidl
new file mode 100644
index 0000000000..02fa882d80
--- /dev/null
+++ b/dom/webidl/SVGFilterPrimitiveStandardAttributes.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin SVGFilterPrimitiveStandardAttributes {
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+  [Constant]
+  readonly attribute SVGAnimatedString result;
+};
diff --git a/dom/webidl/SVGFitToViewBox.webidl b/dom/webidl/SVGFitToViewBox.webidl
new file mode 100644
index 0000000000..650afd15e1
--- /dev/null
+++ b/dom/webidl/SVGFitToViewBox.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin SVGFitToViewBox {
+  [Constant]
+  readonly attribute SVGAnimatedRect viewBox;
+  [Constant]
+  readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+};
diff --git a/dom/webidl/SVGForeignObjectElement.webidl b/dom/webidl/SVGForeignObjectElement.webidl
new file mode 100644
index 0000000000..788fb4baa9
--- /dev/null
+++ b/dom/webidl/SVGForeignObjectElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGForeignObjectElement : SVGGraphicsElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+};
diff --git a/dom/webidl/SVGGElement.webidl b/dom/webidl/SVGGElement.webidl
new file mode 100644
index 0000000000..3714bbee8b
--- /dev/null
+++ b/dom/webidl/SVGGElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGGElement : SVGGraphicsElement {
+};
diff --git a/dom/webidl/SVGGeometryElement.webidl b/dom/webidl/SVGGeometryElement.webidl
new file mode 100644
index 0000000000..6895b2677f
--- /dev/null
+++ b/dom/webidl/SVGGeometryElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGGeometryElement : SVGGraphicsElement {
+  [SameObject]
+  readonly attribute SVGAnimatedNumber pathLength;
+
+  boolean isPointInFill(optional DOMPointInit point = {});
+  boolean isPointInStroke(optional DOMPointInit point = {});
+
+  [BinaryName="getTotalLengthForBinding"]
+  float getTotalLength();
+  [NewObject, Throws]
+  SVGPoint getPointAtLength(float distance);
+};
diff --git a/dom/webidl/SVGGradientElement.webidl b/dom/webidl/SVGGradientElement.webidl
new file mode 100644
index 0000000000..7b74db779d
--- /dev/null
+++ b/dom/webidl/SVGGradientElement.webidl
@@ -0,0 +1,30 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGGradientElement : SVGElement {
+
+  // Spread Method Types
+  const unsigned short SVG_SPREADMETHOD_UNKNOWN = 0;
+  const unsigned short SVG_SPREADMETHOD_PAD = 1;
+  const unsigned short SVG_SPREADMETHOD_REFLECT = 2;
+  const unsigned short SVG_SPREADMETHOD_REPEAT = 3;
+
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration gradientUnits;
+  [Constant]
+  readonly attribute SVGAnimatedTransformList gradientTransform;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration spreadMethod;
+};
+
+SVGGradientElement includes SVGURIReference;
diff --git a/dom/webidl/SVGGraphicsElement.webidl b/dom/webidl/SVGGraphicsElement.webidl
new file mode 100644
index 0000000000..65a87c2501
--- /dev/null
+++ b/dom/webidl/SVGGraphicsElement.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary SVGBoundingBoxOptions {
+  boolean fill = true;
+  boolean stroke = false;
+  boolean markers = false;
+  boolean clipped = false;
+};
+
+[Exposed=Window]
+interface SVGGraphicsElement : SVGElement {
+  readonly attribute SVGAnimatedTransformList transform;
+
+  [Deprecated="SVGNearestViewportElement",
+   Pref="svg.nearestAndFarthestViewportElement.enabled"]
+  readonly attribute SVGElement? nearestViewportElement;
+  [Deprecated="SVGFarthestViewportElement",
+   Pref="svg.nearestAndFarthestViewportElement.enabled"]
+  readonly attribute SVGElement? farthestViewportElement;
+
+  [NewObject]
+  SVGRect getBBox(optional SVGBoundingBoxOptions aOptions = {});
+  SVGMatrix? getCTM();
+  SVGMatrix? getScreenCTM();
+};
+
+SVGGraphicsElement includes SVGTests;
diff --git a/dom/webidl/SVGImageElement.webidl b/dom/webidl/SVGImageElement.webidl
new file mode 100644
index 0000000000..f2dd659695
--- /dev/null
+++ b/dom/webidl/SVGImageElement.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGImageElement : SVGGraphicsElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+  [Constant]
+  readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+  [SetterThrows]
+  attribute DOMString? crossOrigin;
+  [CEReactions, SetterThrows]
+  attribute DOMString decoding;
+  [NewObject]
+  Promise<undefined> decode();
+};
+
+SVGImageElement includes MozImageLoadingContent;
+SVGImageElement includes SVGURIReference;
diff --git a/dom/webidl/SVGLength.webidl b/dom/webidl/SVGLength.webidl
new file mode 100644
index 0000000000..0ab930a231
--- /dev/null
+++ b/dom/webidl/SVGLength.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGLength {
+
+  // Length Unit Types
+  const unsigned short SVG_LENGTHTYPE_UNKNOWN = 0;
+  const unsigned short SVG_LENGTHTYPE_NUMBER = 1;
+  const unsigned short SVG_LENGTHTYPE_PERCENTAGE = 2;
+  const unsigned short SVG_LENGTHTYPE_EMS = 3;
+  const unsigned short SVG_LENGTHTYPE_EXS = 4;
+  const unsigned short SVG_LENGTHTYPE_PX = 5;
+  const unsigned short SVG_LENGTHTYPE_CM = 6;
+  const unsigned short SVG_LENGTHTYPE_MM = 7;
+  const unsigned short SVG_LENGTHTYPE_IN = 8;
+  const unsigned short SVG_LENGTHTYPE_PT = 9;
+  const unsigned short SVG_LENGTHTYPE_PC = 10;
+
+  readonly attribute unsigned short unitType;
+  [Throws]
+           attribute float value;
+  [SetterThrows]
+           attribute float valueInSpecifiedUnits;
+  [SetterThrows]
+           attribute DOMString valueAsString;
+
+  [Throws]
+  undefined newValueSpecifiedUnits(unsigned short unitType, float valueInSpecifiedUnits);
+  [Throws]
+  undefined convertToSpecifiedUnits(unsigned short unitType);
+};
diff --git a/dom/webidl/SVGLengthList.webidl b/dom/webidl/SVGLengthList.webidl
new file mode 100644
index 0000000000..6a12df46e6
--- /dev/null
+++ b/dom/webidl/SVGLengthList.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG11/
+ * https://svgwg.org/svg2-draft/types.html#InterfaceSVGLengthList
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGLengthList {
+  readonly attribute unsigned long numberOfItems;
+  [Throws]
+  undefined clear();
+  [Throws]
+  SVGLength initialize(SVGLength newItem);
+  [Throws]
+  getter SVGLength getItem(unsigned long index);
+  [Throws]
+  SVGLength insertItemBefore(SVGLength newItem, unsigned long index);
+  [Throws]
+  SVGLength replaceItem(SVGLength newItem, unsigned long index);
+  [Throws]
+  SVGLength removeItem(unsigned long index);
+  [Throws]
+  SVGLength appendItem(SVGLength newItem);
+  [Throws]
+  setter undefined (unsigned long index, SVGLength newItem);
+
+  // Mozilla-specific stuff
+  readonly attribute unsigned long length; // synonym for numberOfItems
+};
diff --git a/dom/webidl/SVGLineElement.webidl b/dom/webidl/SVGLineElement.webidl
new file mode 100644
index 0000000000..ccf581432c
--- /dev/null
+++ b/dom/webidl/SVGLineElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGLineElement : SVGGeometryElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x1;
+  [Constant]
+  readonly attribute SVGAnimatedLength y1;
+  [Constant]
+  readonly attribute SVGAnimatedLength x2;
+  [Constant]
+  readonly attribute SVGAnimatedLength y2;
+};
diff --git a/dom/webidl/SVGLinearGradientElement.webidl b/dom/webidl/SVGLinearGradientElement.webidl
new file mode 100644
index 0000000000..db4690f438
--- /dev/null
+++ b/dom/webidl/SVGLinearGradientElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGLinearGradientElement : SVGGradientElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x1;
+  [Constant]
+  readonly attribute SVGAnimatedLength y1;
+  [Constant]
+  readonly attribute SVGAnimatedLength x2;
+  [Constant]
+  readonly attribute SVGAnimatedLength y2;
+};
diff --git a/dom/webidl/SVGMPathElement.webidl b/dom/webidl/SVGMPathElement.webidl
new file mode 100644
index 0000000000..7999a8d744
--- /dev/null
+++ b/dom/webidl/SVGMPathElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGMPathElement : SVGElement {
+};
+
+SVGMPathElement includes SVGURIReference;
diff --git a/dom/webidl/SVGMarkerElement.webidl b/dom/webidl/SVGMarkerElement.webidl
new file mode 100644
index 0000000000..1c5ab43d80
--- /dev/null
+++ b/dom/webidl/SVGMarkerElement.webidl
@@ -0,0 +1,46 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGMarkerElement : SVGElement {
+
+  // Marker Unit Types
+  const unsigned short SVG_MARKERUNITS_UNKNOWN = 0;
+  const unsigned short SVG_MARKERUNITS_USERSPACEONUSE = 1;
+  const unsigned short SVG_MARKERUNITS_STROKEWIDTH = 2;
+
+  // Marker Orientation Types
+  const unsigned short SVG_MARKER_ORIENT_UNKNOWN = 0;
+  const unsigned short SVG_MARKER_ORIENT_AUTO = 1;
+  const unsigned short SVG_MARKER_ORIENT_ANGLE = 2;
+  const unsigned short SVG_MARKER_ORIENT_AUTO_START_REVERSE = 3;
+
+  [Constant]
+  readonly attribute SVGAnimatedLength refX;
+  [Constant]
+  readonly attribute SVGAnimatedLength refY;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration markerUnits;
+  [Constant]
+  readonly attribute SVGAnimatedLength markerWidth;
+  [Constant]
+  readonly attribute SVGAnimatedLength markerHeight;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration orientType;
+  [Constant]
+  readonly attribute SVGAnimatedAngle orientAngle;
+
+  undefined setOrientToAuto();
+  undefined setOrientToAngle(SVGAngle angle);
+};
+
+SVGMarkerElement includes SVGFitToViewBox;
diff --git a/dom/webidl/SVGMaskElement.webidl b/dom/webidl/SVGMaskElement.webidl
new file mode 100644
index 0000000000..f15a372abe
--- /dev/null
+++ b/dom/webidl/SVGMaskElement.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGMaskElement : SVGElement {
+
+  // Mask Types
+  const unsigned short SVG_MASKTYPE_LUMINANCE = 0;
+  const unsigned short SVG_MASKTYPE_ALPHA = 1;
+
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration maskUnits;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration maskContentUnits;
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+};
diff --git a/dom/webidl/SVGMatrix.webidl b/dom/webidl/SVGMatrix.webidl
new file mode 100644
index 0000000000..e3136fad28
--- /dev/null
+++ b/dom/webidl/SVGMatrix.webidl
@@ -0,0 +1,51 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGMatrix {
+
+  [SetterThrows]
+  attribute float a;
+  [SetterThrows]
+  attribute float b;
+  [SetterThrows]
+  attribute float c;
+  [SetterThrows]
+  attribute float d;
+  [SetterThrows]
+  attribute float e;
+  [SetterThrows]
+  attribute float f;
+
+  [NewObject]
+  SVGMatrix multiply(SVGMatrix secondMatrix);
+  [NewObject, Throws]
+  SVGMatrix inverse();
+  [NewObject]
+  SVGMatrix translate(float x, float y);
+  [NewObject]
+  SVGMatrix scale(float scaleFactor);
+  [NewObject]
+  SVGMatrix scaleNonUniform(float scaleFactorX, float scaleFactorY);
+  [NewObject]
+  SVGMatrix rotate(float angle);
+  [NewObject, Throws]
+  SVGMatrix rotateFromVector(float x, float y);
+  [NewObject]
+  SVGMatrix flipX();
+  [NewObject]
+  SVGMatrix flipY();
+  [NewObject, Throws]
+  SVGMatrix skewX(float angle);
+  [NewObject, Throws]
+  SVGMatrix skewY(float angle);
+};
diff --git a/dom/webidl/SVGMetadataElement.webidl b/dom/webidl/SVGMetadataElement.webidl
new file mode 100644
index 0000000000..bd6bdd6682
--- /dev/null
+++ b/dom/webidl/SVGMetadataElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGMetadataElement : SVGElement {
+};
diff --git a/dom/webidl/SVGNumber.webidl b/dom/webidl/SVGNumber.webidl
new file mode 100644
index 0000000000..71921c8466
--- /dev/null
+++ b/dom/webidl/SVGNumber.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGNumber {
+  [SetterThrows]
+  attribute float value;
+};
diff --git a/dom/webidl/SVGNumberList.webidl b/dom/webidl/SVGNumberList.webidl
new file mode 100644
index 0000000000..f231024e65
--- /dev/null
+++ b/dom/webidl/SVGNumberList.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG11/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGNumberList {
+  readonly attribute unsigned long numberOfItems;
+  [Throws]
+  undefined clear();
+  [Throws]
+  SVGNumber initialize(SVGNumber newItem);
+  [Throws]
+  getter SVGNumber getItem(unsigned long index);
+  [Throws]
+  SVGNumber insertItemBefore(SVGNumber newItem, unsigned long index);
+  [Throws]
+  SVGNumber replaceItem(SVGNumber newItem, unsigned long index);
+  [Throws]
+  SVGNumber removeItem(unsigned long index);
+  [Throws]
+  SVGNumber appendItem(SVGNumber newItem);
+
+  // Mozilla-specific stuff
+  readonly attribute unsigned long length; // synonym for numberOfItems
+};
diff --git a/dom/webidl/SVGPathElement.webidl b/dom/webidl/SVGPathElement.webidl
new file mode 100644
index 0000000000..5dbb638e85
--- /dev/null
+++ b/dom/webidl/SVGPathElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+[Exposed=Window]
+interface SVGPathElement : SVGGeometryElement {
+  [Pref="dom.svg.pathSeg.enabled"]
+  unsigned long getPathSegAtLength(float distance);
+};
+
+SVGPathElement includes SVGAnimatedPathData;
diff --git a/dom/webidl/SVGPathSeg.webidl b/dom/webidl/SVGPathSeg.webidl
new file mode 100644
index 0000000000..af0fb39847
--- /dev/null
+++ b/dom/webidl/SVGPathSeg.webidl
@@ -0,0 +1,254 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSeg {
+
+  // Path Segment Types
+  const unsigned short PATHSEG_UNKNOWN = 0;
+  const unsigned short PATHSEG_CLOSEPATH = 1;
+  const unsigned short PATHSEG_MOVETO_ABS = 2;
+  const unsigned short PATHSEG_MOVETO_REL = 3;
+  const unsigned short PATHSEG_LINETO_ABS = 4;
+  const unsigned short PATHSEG_LINETO_REL = 5;
+  const unsigned short PATHSEG_CURVETO_CUBIC_ABS = 6;
+  const unsigned short PATHSEG_CURVETO_CUBIC_REL = 7;
+  const unsigned short PATHSEG_CURVETO_QUADRATIC_ABS = 8;
+  const unsigned short PATHSEG_CURVETO_QUADRATIC_REL = 9;
+  const unsigned short PATHSEG_ARC_ABS = 10;
+  const unsigned short PATHSEG_ARC_REL = 11;
+  const unsigned short PATHSEG_LINETO_HORIZONTAL_ABS = 12;
+  const unsigned short PATHSEG_LINETO_HORIZONTAL_REL = 13;
+  const unsigned short PATHSEG_LINETO_VERTICAL_ABS = 14;
+  const unsigned short PATHSEG_LINETO_VERTICAL_REL = 15;
+  const unsigned short PATHSEG_CURVETO_CUBIC_SMOOTH_ABS = 16;
+  const unsigned short PATHSEG_CURVETO_CUBIC_SMOOTH_REL = 17;
+  const unsigned short PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS = 18;
+  const unsigned short PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL = 19;
+
+  [Pure]
+  readonly attribute unsigned short pathSegType;
+  [Pure]
+  readonly attribute DOMString pathSegTypeAsLetter;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegClosePath : SVGPathSeg {
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegMovetoAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegMovetoRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegLinetoAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegLinetoRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegCurvetoCubicAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x1;
+  [SetterThrows]
+  attribute float y1;
+  [SetterThrows]
+  attribute float x2;
+  [SetterThrows]
+  attribute float y2;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegCurvetoCubicRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x1;
+  [SetterThrows]
+  attribute float y1;
+  [SetterThrows]
+  attribute float x2;
+  [SetterThrows]
+  attribute float y2;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegCurvetoQuadraticAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x1;
+  [SetterThrows]
+  attribute float y1;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegCurvetoQuadraticRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x1;
+  [SetterThrows]
+  attribute float y1;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegArcAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float r1;
+  [SetterThrows]
+  attribute float r2;
+  [SetterThrows]
+  attribute float angle;
+  [SetterThrows]
+  attribute boolean largeArcFlag;
+  [SetterThrows]
+  attribute boolean sweepFlag;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegArcRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float r1;
+  [SetterThrows]
+  attribute float r2;
+  [SetterThrows]
+  attribute float angle;
+  [SetterThrows]
+  attribute boolean largeArcFlag;
+  [SetterThrows]
+  attribute boolean sweepFlag;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegLinetoHorizontalAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegLinetoHorizontalRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegLinetoVerticalAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float y;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegLinetoVerticalRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float y;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegCurvetoCubicSmoothAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x2;
+  [SetterThrows]
+  attribute float y2;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegCurvetoCubicSmoothRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float x2;
+  [SetterThrows]
+  attribute float y2;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegCurvetoQuadraticSmoothAbs : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface SVGPathSegCurvetoQuadraticSmoothRel : SVGPathSeg {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+};
diff --git a/dom/webidl/SVGPathSegList.webidl b/dom/webidl/SVGPathSegList.webidl
new file mode 100644
index 0000000000..48d003663b
--- /dev/null
+++ b/dom/webidl/SVGPathSegList.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG11/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window,
+ Pref="dom.svg.pathSeg.enabled"]
+interface SVGPathSegList {
+  readonly attribute unsigned long numberOfItems;
+  [Throws]
+  getter SVGPathSeg getItem(unsigned long index);
+
+  // Mozilla-specific stuff
+  readonly attribute unsigned long length; // synonym for numberOfItems
+};
diff --git a/dom/webidl/SVGPatternElement.webidl b/dom/webidl/SVGPatternElement.webidl
new file mode 100644
index 0000000000..c69d450cfe
--- /dev/null
+++ b/dom/webidl/SVGPatternElement.webidl
@@ -0,0 +1,32 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/pservers.html#InterfaceSVGPatternElement
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGPatternElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration patternUnits;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration patternContentUnits;
+  [Constant]
+  readonly attribute SVGAnimatedTransformList patternTransform;
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+};
+
+SVGPatternElement includes SVGFitToViewBox;
+SVGPatternElement includes SVGURIReference;
diff --git a/dom/webidl/SVGPoint.webidl b/dom/webidl/SVGPoint.webidl
new file mode 100644
index 0000000000..f66457975f
--- /dev/null
+++ b/dom/webidl/SVGPoint.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGPoint {
+
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+
+  [NewObject, Throws]
+  SVGPoint matrixTransform(optional DOMMatrix2DInit matrix = {});
+};
diff --git a/dom/webidl/SVGPointList.webidl b/dom/webidl/SVGPointList.webidl
new file mode 100644
index 0000000000..45a41d613d
--- /dev/null
+++ b/dom/webidl/SVGPointList.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG11/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGPointList {
+  readonly attribute unsigned long numberOfItems;
+  [Throws]
+  undefined clear();
+  [Throws]
+  SVGPoint initialize(SVGPoint newItem);
+  [Throws]
+  getter SVGPoint getItem(unsigned long index);
+  [Throws]
+  SVGPoint insertItemBefore(SVGPoint newItem, unsigned long index);
+  [Throws]
+  SVGPoint replaceItem(SVGPoint newItem, unsigned long index);
+  [Throws]
+  SVGPoint removeItem(unsigned long index);
+  [Throws]
+  SVGPoint appendItem(SVGPoint newItem);
+
+  // Mozilla-specific stuff
+  readonly attribute unsigned long length; // synonym for numberOfItems
+};
diff --git a/dom/webidl/SVGPolygonElement.webidl b/dom/webidl/SVGPolygonElement.webidl
new file mode 100644
index 0000000000..8cf9fd0131
--- /dev/null
+++ b/dom/webidl/SVGPolygonElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGPolygonElement : SVGGeometryElement {
+};
+
+SVGPolygonElement includes SVGAnimatedPoints;
diff --git a/dom/webidl/SVGPolylineElement.webidl b/dom/webidl/SVGPolylineElement.webidl
new file mode 100644
index 0000000000..612322c988
--- /dev/null
+++ b/dom/webidl/SVGPolylineElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGPolylineElement : SVGGeometryElement {
+};
+
+SVGPolylineElement includes SVGAnimatedPoints;
diff --git a/dom/webidl/SVGPreserveAspectRatio.webidl b/dom/webidl/SVGPreserveAspectRatio.webidl
new file mode 100644
index 0000000000..4154d94c8c
--- /dev/null
+++ b/dom/webidl/SVGPreserveAspectRatio.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGPreserveAspectRatio {
+
+  // Alignment Types
+  const unsigned short SVG_PRESERVEASPECTRATIO_UNKNOWN = 0;
+  const unsigned short SVG_PRESERVEASPECTRATIO_NONE = 1;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMIN = 2;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMIN = 3;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMIN = 4;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMID = 5;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMID = 6;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMID = 7;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMAX = 8;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMAX = 9;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMAX = 10;
+
+  // Meet-or-slice Types
+  const unsigned short SVG_MEETORSLICE_UNKNOWN = 0;
+  const unsigned short SVG_MEETORSLICE_MEET = 1;
+  const unsigned short SVG_MEETORSLICE_SLICE = 2;
+
+  [SetterThrows]
+  attribute unsigned short align;
+  [SetterThrows]
+  attribute unsigned short meetOrSlice;
+};
diff --git a/dom/webidl/SVGRadialGradientElement.webidl b/dom/webidl/SVGRadialGradientElement.webidl
new file mode 100644
index 0000000000..376ff6e56f
--- /dev/null
+++ b/dom/webidl/SVGRadialGradientElement.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGRadialGradientElement : SVGGradientElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength cx;
+  [Constant]
+  readonly attribute SVGAnimatedLength cy;
+  [Constant]
+  readonly attribute SVGAnimatedLength r;
+  [Constant]
+  readonly attribute SVGAnimatedLength fx;
+  [Constant]
+  readonly attribute SVGAnimatedLength fy;
+  // XXX: Bug 1242048
+  // [SameObject]
+  readonly attribute SVGAnimatedLength fr;
+};
diff --git a/dom/webidl/SVGRect.webidl b/dom/webidl/SVGRect.webidl
new file mode 100644
index 0000000000..dceb09dbbb
--- /dev/null
+++ b/dom/webidl/SVGRect.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGRect {
+  [SetterThrows]
+  attribute float x;
+  [SetterThrows]
+  attribute float y;
+  [SetterThrows]
+  attribute float width;
+  [SetterThrows]
+  attribute float height;
+};
diff --git a/dom/webidl/SVGRectElement.webidl b/dom/webidl/SVGRectElement.webidl
new file mode 100644
index 0000000000..f62a326e5b
--- /dev/null
+++ b/dom/webidl/SVGRectElement.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGRectElement : SVGGeometryElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+  [Constant]
+  readonly attribute SVGAnimatedLength rx;
+  [Constant]
+  readonly attribute SVGAnimatedLength ry;
+};
diff --git a/dom/webidl/SVGSVGElement.webidl b/dom/webidl/SVGSVGElement.webidl
new file mode 100644
index 0000000000..c5340d5ed0
--- /dev/null
+++ b/dom/webidl/SVGSVGElement.webidl
@@ -0,0 +1,68 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGSVGElement : SVGGraphicsElement {
+
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+  [UseCounter]
+           attribute float currentScale;
+  readonly attribute SVGPoint currentTranslate;
+
+  [DependsOn=Nothing, Affects=Nothing]
+  unsigned long suspendRedraw(unsigned long maxWaitMilliseconds);
+  [DependsOn=Nothing, Affects=Nothing]
+  undefined unsuspendRedraw(unsigned long suspendHandleID);
+  [DependsOn=Nothing, Affects=Nothing]
+  undefined unsuspendRedrawAll();
+  [DependsOn=Nothing, Affects=Nothing]
+  undefined forceRedraw();
+  undefined pauseAnimations();
+  undefined unpauseAnimations();
+  boolean animationsPaused();
+  [BinaryName="getCurrentTimeAsFloat"]
+  float getCurrentTime();
+  undefined setCurrentTime(float seconds);
+  // NodeList getIntersectionList(SVGRect rect, SVGElement referenceElement);
+  // NodeList getEnclosureList(SVGRect rect, SVGElement referenceElement);
+  // boolean checkIntersection(SVGElement element, SVGRect rect);
+  // boolean checkEnclosure(SVGElement element, SVGRect rect);
+  undefined deselectAll();
+  [NewObject]
+  SVGNumber createSVGNumber();
+  [NewObject]
+  SVGLength createSVGLength();
+  [NewObject]
+  SVGAngle createSVGAngle();
+  [NewObject]
+  SVGPoint createSVGPoint();
+  [NewObject]
+  SVGMatrix createSVGMatrix();
+  [NewObject]
+  SVGRect createSVGRect();
+  [NewObject]
+  SVGTransform createSVGTransform();
+  [NewObject, Throws]
+  SVGTransform createSVGTransformFromMatrix(optional DOMMatrix2DInit matrix = {});
+  [UseCounter]
+  Element? getElementById(DOMString elementId);
+};
+
+SVGSVGElement includes SVGFitToViewBox;
+SVGSVGElement includes SVGZoomAndPan;
diff --git a/dom/webidl/SVGScriptElement.webidl b/dom/webidl/SVGScriptElement.webidl
new file mode 100644
index 0000000000..7baa74ac16
--- /dev/null
+++ b/dom/webidl/SVGScriptElement.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGScriptElement : SVGElement {
+  [SetterThrows]
+  attribute DOMString type;
+
+  // CORS attribute
+  [SetterThrows]
+  attribute DOMString? crossOrigin;
+};
+
+SVGScriptElement includes SVGURIReference;
diff --git a/dom/webidl/SVGSetElement.webidl b/dom/webidl/SVGSetElement.webidl
new file mode 100644
index 0000000000..cad45e4b21
--- /dev/null
+++ b/dom/webidl/SVGSetElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGSetElement : SVGAnimationElement {
+};
diff --git a/dom/webidl/SVGStopElement.webidl b/dom/webidl/SVGStopElement.webidl
new file mode 100644
index 0000000000..27a900a0c2
--- /dev/null
+++ b/dom/webidl/SVGStopElement.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGStopElement : SVGElement {
+  [Constant]
+  readonly attribute SVGAnimatedNumber offset;
+};
diff --git a/dom/webidl/SVGStringList.webidl b/dom/webidl/SVGStringList.webidl
new file mode 100644
index 0000000000..eb3c2d3a83
--- /dev/null
+++ b/dom/webidl/SVGStringList.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGStringList {
+  readonly attribute unsigned long length;
+  readonly attribute unsigned long numberOfItems;
+
+  undefined clear();
+  [Throws]
+  DOMString initialize(DOMString newItem);
+  [Throws]
+  DOMString getItem(unsigned long index);
+  getter DOMString(unsigned long index);
+  [Throws]
+  DOMString insertItemBefore(DOMString newItem, unsigned long index);
+  [Throws]
+  DOMString replaceItem(DOMString newItem, unsigned long index);
+  [Throws]
+  DOMString removeItem(unsigned long index);
+  [Throws]
+  DOMString appendItem(DOMString newItem);
+  //setter undefined (unsigned long index, DOMString newItem);
+};
diff --git a/dom/webidl/SVGStyleElement.webidl b/dom/webidl/SVGStyleElement.webidl
new file mode 100644
index 0000000000..e905fcdee5
--- /dev/null
+++ b/dom/webidl/SVGStyleElement.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGStyleElement : SVGElement {
+  [Pure]
+  attribute boolean disabled;
+  [SetterThrows]
+  attribute DOMString type;
+  [SetterThrows]
+  attribute DOMString media;
+  [SetterThrows]
+  attribute DOMString title;
+};
+SVGStyleElement includes LinkStyle;
diff --git a/dom/webidl/SVGSwitchElement.webidl b/dom/webidl/SVGSwitchElement.webidl
new file mode 100644
index 0000000000..7c08a90349
--- /dev/null
+++ b/dom/webidl/SVGSwitchElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGSwitchElement : SVGGraphicsElement {
+};
diff --git a/dom/webidl/SVGSymbolElement.webidl b/dom/webidl/SVGSymbolElement.webidl
new file mode 100644
index 0000000000..76861ff5af
--- /dev/null
+++ b/dom/webidl/SVGSymbolElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/struct.html#InterfaceSVGSymbolElement
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGSymbolElement : SVGElement {
+};
+
+SVGSymbolElement includes SVGFitToViewBox;
+SVGSymbolElement includes SVGTests;
diff --git a/dom/webidl/SVGTSpanElement.webidl b/dom/webidl/SVGTSpanElement.webidl
new file mode 100644
index 0000000000..10dec3e5fd
--- /dev/null
+++ b/dom/webidl/SVGTSpanElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGTSpanElement : SVGTextPositioningElement {
+};
diff --git a/dom/webidl/SVGTests.webidl b/dom/webidl/SVGTests.webidl
new file mode 100644
index 0000000000..6f7ec360ea
--- /dev/null
+++ b/dom/webidl/SVGTests.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin SVGTests {
+
+  readonly attribute SVGStringList requiredExtensions;
+  readonly attribute SVGStringList systemLanguage;
+};
diff --git a/dom/webidl/SVGTextContentElement.webidl b/dom/webidl/SVGTextContentElement.webidl
new file mode 100644
index 0000000000..467ea0c695
--- /dev/null
+++ b/dom/webidl/SVGTextContentElement.webidl
@@ -0,0 +1,41 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGTextContentElement : SVGGraphicsElement {
+
+  // lengthAdjust Types
+  const unsigned short LENGTHADJUST_UNKNOWN = 0;
+  const unsigned short LENGTHADJUST_SPACING = 1;
+  const unsigned short LENGTHADJUST_SPACINGANDGLYPHS = 2;
+
+  [Constant]
+  readonly attribute SVGAnimatedLength textLength;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration lengthAdjust;
+
+  long getNumberOfChars();
+  float getComputedTextLength();
+  [Throws]
+  float getSubStringLength(unsigned long charnum, unsigned long nchars);
+  [Throws]
+  SVGPoint getStartPositionOfChar(unsigned long charnum);
+  [Throws]
+  SVGPoint getEndPositionOfChar(unsigned long charnum);
+  [NewObject, Throws]
+  SVGRect getExtentOfChar(unsigned long charnum);
+  [Throws]
+  float getRotationOfChar(unsigned long charnum);
+  long getCharNumAtPosition(optional DOMPointInit point = {});
+  [Throws]
+  undefined selectSubString(unsigned long charnum, unsigned long nchars);
+};
diff --git a/dom/webidl/SVGTextElement.webidl b/dom/webidl/SVGTextElement.webidl
new file mode 100644
index 0000000000..fc6b711f94
--- /dev/null
+++ b/dom/webidl/SVGTextElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGTextElement : SVGTextPositioningElement {
+};
diff --git a/dom/webidl/SVGTextPathElement.webidl b/dom/webidl/SVGTextPathElement.webidl
new file mode 100644
index 0000000000..5905e69a5c
--- /dev/null
+++ b/dom/webidl/SVGTextPathElement.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGTextPathElement : SVGTextContentElement {
+
+  // textPath Method Types
+  const unsigned short TEXTPATH_METHODTYPE_UNKNOWN = 0;
+  const unsigned short TEXTPATH_METHODTYPE_ALIGN = 1;
+  const unsigned short TEXTPATH_METHODTYPE_STRETCH = 2;
+
+  // textPath Spacing Types
+  const unsigned short TEXTPATH_SPACINGTYPE_UNKNOWN = 0;
+  const unsigned short TEXTPATH_SPACINGTYPE_AUTO = 1;
+  const unsigned short TEXTPATH_SPACINGTYPE_EXACT = 2;
+
+  [Constant]
+  readonly attribute SVGAnimatedLength startOffset;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration method;
+  [Constant]
+  readonly attribute SVGAnimatedEnumeration spacing;
+};
+
+SVGTextPathElement includes SVGURIReference;
diff --git a/dom/webidl/SVGTextPositioningElement.webidl b/dom/webidl/SVGTextPositioningElement.webidl
new file mode 100644
index 0000000000..21d2367cde
--- /dev/null
+++ b/dom/webidl/SVGTextPositioningElement.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGTextPositioningElement : SVGTextContentElement {
+  [Constant]
+  readonly attribute SVGAnimatedLengthList x;
+  [Constant]
+  readonly attribute SVGAnimatedLengthList y;
+  [Constant]
+  readonly attribute SVGAnimatedLengthList dx;
+  [Constant]
+  readonly attribute SVGAnimatedLengthList dy;
+  [Constant]
+  readonly attribute SVGAnimatedNumberList rotate;
+};
diff --git a/dom/webidl/SVGTitleElement.webidl b/dom/webidl/SVGTitleElement.webidl
new file mode 100644
index 0000000000..469b7bead5
--- /dev/null
+++ b/dom/webidl/SVGTitleElement.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGTitleElement : SVGElement {
+};
diff --git a/dom/webidl/SVGTransform.webidl b/dom/webidl/SVGTransform.webidl
new file mode 100644
index 0000000000..621c84b997
--- /dev/null
+++ b/dom/webidl/SVGTransform.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGTransform {
+
+  // Transform Types
+  const unsigned short SVG_TRANSFORM_UNKNOWN = 0;
+  const unsigned short SVG_TRANSFORM_MATRIX = 1;
+  const unsigned short SVG_TRANSFORM_TRANSLATE = 2;
+  const unsigned short SVG_TRANSFORM_SCALE = 3;
+  const unsigned short SVG_TRANSFORM_ROTATE = 4;
+  const unsigned short SVG_TRANSFORM_SKEWX = 5;
+  const unsigned short SVG_TRANSFORM_SKEWY = 6;
+
+  readonly attribute unsigned short type;
+  [BinaryName="getMatrix"]
+  readonly attribute SVGMatrix matrix;
+  readonly attribute float angle;
+
+  [Throws]
+  undefined setMatrix(optional DOMMatrix2DInit matrix = {});
+  [Throws]
+  undefined setTranslate(float tx, float ty);
+  [Throws]
+  undefined setScale(float sx, float sy);
+  [Throws]
+  undefined setRotate(float angle, float cx, float cy);
+  [Throws]
+  undefined setSkewX(float angle);
+  [Throws]
+  undefined setSkewY(float angle);
+};
diff --git a/dom/webidl/SVGTransformList.webidl b/dom/webidl/SVGTransformList.webidl
new file mode 100644
index 0000000000..a29926a651
--- /dev/null
+++ b/dom/webidl/SVGTransformList.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG11/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGTransformList {
+  readonly attribute unsigned long numberOfItems;
+  [Throws]
+  undefined clear();
+  [Throws]
+  SVGTransform initialize(SVGTransform newItem);
+  [Throws]
+  getter SVGTransform getItem(unsigned long index);
+  [Throws]
+  SVGTransform insertItemBefore(SVGTransform newItem, unsigned long index);
+  [Throws]
+  SVGTransform replaceItem(SVGTransform newItem, unsigned long index);
+  [Throws]
+  SVGTransform removeItem(unsigned long index);
+  [Throws]
+  SVGTransform appendItem(SVGTransform newItem);
+  [Throws]
+  SVGTransform createSVGTransformFromMatrix(optional DOMMatrix2DInit matrix = {});
+  [Throws]
+  SVGTransform? consolidate();
+
+  // Mozilla-specific stuff
+  readonly attribute unsigned long length; // synonym for numberOfItems
+};
diff --git a/dom/webidl/SVGURIReference.webidl b/dom/webidl/SVGURIReference.webidl
new file mode 100644
index 0000000000..12d216a025
--- /dev/null
+++ b/dom/webidl/SVGURIReference.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin SVGURIReference {
+  [Constant]
+  readonly attribute SVGAnimatedString href;
+};
diff --git a/dom/webidl/SVGUnitTypes.webidl b/dom/webidl/SVGUnitTypes.webidl
new file mode 100644
index 0000000000..c1c82d6fcb
--- /dev/null
+++ b/dom/webidl/SVGUnitTypes.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://svgwg.org/svg2-draft/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGUnitTypes {
+  // Unit Types
+  const unsigned short SVG_UNIT_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_UNIT_TYPE_USERSPACEONUSE = 1;
+  const unsigned short SVG_UNIT_TYPE_OBJECTBOUNDINGBOX = 2;
+};
diff --git a/dom/webidl/SVGUseElement.webidl b/dom/webidl/SVGUseElement.webidl
new file mode 100644
index 0000000000..1da30df0a5
--- /dev/null
+++ b/dom/webidl/SVGUseElement.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGUseElement : SVGGraphicsElement {
+  [Constant]
+  readonly attribute SVGAnimatedLength x;
+  [Constant]
+  readonly attribute SVGAnimatedLength y;
+  [Constant]
+  readonly attribute SVGAnimatedLength width;
+  [Constant]
+  readonly attribute SVGAnimatedLength height;
+  //readonly attribute SVGElementInstance instanceRoot;
+  //readonly attribute SVGElementInstance animatedInstanceRoot;
+};
+
+SVGUseElement includes SVGURIReference;
diff --git a/dom/webidl/SVGViewElement.webidl b/dom/webidl/SVGViewElement.webidl
new file mode 100644
index 0000000000..e70620e2c1
--- /dev/null
+++ b/dom/webidl/SVGViewElement.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface SVGViewElement : SVGElement {
+};
+
+SVGViewElement includes SVGFitToViewBox;
+SVGViewElement includes SVGZoomAndPan;
diff --git a/dom/webidl/SVGZoomAndPan.webidl b/dom/webidl/SVGZoomAndPan.webidl
new file mode 100644
index 0000000000..d6c9aa012f
--- /dev/null
+++ b/dom/webidl/SVGZoomAndPan.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/SVG2/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin SVGZoomAndPan {
+  // Zoom and Pan Types
+  const unsigned short SVG_ZOOMANDPAN_UNKNOWN = 0;
+  const unsigned short SVG_ZOOMANDPAN_DISABLE = 1;
+  const unsigned short SVG_ZOOMANDPAN_MAGNIFY = 2;
+
+  [SetterThrows]
+  attribute unsigned short zoomAndPan;
+};
diff --git a/dom/webidl/Sanitizer.webidl b/dom/webidl/Sanitizer.webidl
new file mode 100644
index 0000000000..894896a46f
--- /dev/null
+++ b/dom/webidl/Sanitizer.webidl
@@ -0,0 +1,54 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://wicg.github.io/sanitizer-api/#sanitizer
+ * https://wicg.github.io/sanitizer-api/#config
+ *
+ * * Copyright © 2020 the Contributors to the HTML Sanitizer API Specification,
+ * published by the Web Platform Incubator Community Group under the W3C Community Contributor License Agreement (CLA).
+ */
+
+// NOTE: This IDL is still under development:
+// https://github.com/WICG/sanitizer-api/issues/181
+
+typedef (DocumentFragment or Document) SanitizerInput;
+
+[GenerateConversionToJS]
+dictionary SanitizerElementNamespace {
+  required DOMString name;
+  required DOMString _namespace;
+};
+
+typedef (DOMString or SanitizerElementNamespace) SanitizerElement;
+
+enum Star {
+  "*"
+};
+
+dictionary SanitizerAttribute {
+  required DOMString name;
+  DOMString? _namespace = null;
+  required (Star or sequence<SanitizerElement>) elements;
+};
+
+[Exposed=Window, SecureContext, Pref="dom.security.sanitizer.enabled"]
+interface Sanitizer {
+  [Throws, UseCounter]
+  constructor(optional SanitizerConfig sanitizerConfig = {});
+  [UseCounter, Throws]
+  DocumentFragment sanitize(SanitizerInput input);
+};
+
+dictionary SanitizerConfig {
+  sequence<SanitizerElement> allowElements;
+  sequence<SanitizerElement> blockElements;
+  sequence<SanitizerElement> dropElements;
+  sequence<SanitizerAttribute> allowAttributes;
+  sequence<SanitizerAttribute> dropAttributes;
+  boolean allowCustomElements;
+  boolean allowUnknownMarkup;
+  boolean allowComments;
+};
diff --git a/dom/webidl/Screen.webidl b/dom/webidl/Screen.webidl
new file mode 100644
index 0000000000..f237019e93
--- /dev/null
+++ b/dom/webidl/Screen.webidl
@@ -0,0 +1,87 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Exposed=Window]
+interface Screen : EventTarget {
+  // CSSOM-View
+  // http://dev.w3.org/csswg/cssom-view/#the-screen-interface
+  [Throws]
+  readonly attribute long availWidth;
+  [Throws]
+  readonly attribute long availHeight;
+  [Throws]
+  readonly attribute long width;
+  [Throws]
+  readonly attribute long height;
+  [Throws]
+  readonly attribute long colorDepth;
+  [Throws]
+  readonly attribute long pixelDepth;
+
+  [Throws]
+  readonly attribute long top;
+  [Throws]
+  readonly attribute long left;
+  [Throws]
+  readonly attribute long availTop;
+  [Throws]
+  readonly attribute long availLeft;
+
+  /**
+   * DEPRECATED, use ScreenOrientation API instead.
+   * Returns the current screen orientation.
+   * Can be: landscape-primary, landscape-secondary,
+   *         portrait-primary or portrait-secondary.
+   */
+  [NeedsCallerType]
+  readonly attribute DOMString mozOrientation;
+
+  attribute EventHandler onmozorientationchange;
+
+  /**
+   * DEPRECATED, use ScreenOrientation API instead.
+   * Lock screen orientation to the specified type.
+   */
+  [Throws]
+  boolean mozLockOrientation(DOMString orientation);
+  [Throws]
+  boolean mozLockOrientation(sequence<DOMString> orientation);
+
+  /**
+   * DEPRECATED, use ScreenOrientation API instead.
+   * Unlock the screen orientation.
+   */
+  undefined mozUnlockOrientation();
+};
+
+// https://w3c.github.io/screen-orientation
+partial interface Screen {
+  readonly attribute ScreenOrientation orientation;
+};
+
+// https://wicg.github.io/media-capabilities/#idl-index
+enum ScreenColorGamut {
+  "srgb",
+  "p3",
+  "rec2020",
+};
+
+[Func="nsScreen::MediaCapabilitiesEnabled",
+ Exposed=Window]
+interface ScreenLuminance {
+  readonly attribute double min;
+  readonly attribute double max;
+  readonly attribute double maxAverage;
+};
+
+partial interface Screen {
+  [Func="nsScreen::MediaCapabilitiesEnabled"]
+  readonly attribute ScreenColorGamut colorGamut;
+  [Func="nsScreen::MediaCapabilitiesEnabled"]
+  readonly attribute ScreenLuminance? luminance;
+
+  [Func="nsScreen::MediaCapabilitiesEnabled"]
+  attribute EventHandler onchange;
+};
diff --git a/dom/webidl/ScreenOrientation.webidl b/dom/webidl/ScreenOrientation.webidl
new file mode 100644
index 0000000000..9a911991b6
--- /dev/null
+++ b/dom/webidl/ScreenOrientation.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/screen-orientation
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights
+ * Reserved. W3C liability, trademark and document use rules apply.
+ */
+
+enum OrientationType {
+  "portrait-primary",
+  "portrait-secondary",
+  "landscape-primary",
+  "landscape-secondary"
+};
+
+enum OrientationLockType {
+  "any",
+  "natural",
+  "landscape",
+  "portrait",
+  "portrait-primary",
+  "portrait-secondary",
+  "landscape-primary",
+  "landscape-secondary"
+};
+
+[Exposed=Window]
+interface ScreenOrientation : EventTarget {
+  [NewObject]
+  Promise<undefined> lock(OrientationLockType orientation);
+  [Throws]
+  undefined unlock();
+  [Throws, NeedsCallerType]
+  readonly attribute OrientationType type;
+  [Throws, NeedsCallerType]
+  readonly attribute unsigned short angle;
+  attribute EventHandler onchange;
+};
diff --git a/dom/webidl/ScriptProcessorNode.webidl b/dom/webidl/ScriptProcessorNode.webidl
new file mode 100644
index 0000000000..7df0cf6112
--- /dev/null
+++ b/dom/webidl/ScriptProcessorNode.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface ScriptProcessorNode : AudioNode {
+
+    attribute EventHandler onaudioprocess;
+
+    readonly attribute long bufferSize;
+
+};
+
+// Mozilla extension
+ScriptProcessorNode includes AudioNodePassThrough;
diff --git a/dom/webidl/ScrollAreaEvent.webidl b/dom/webidl/ScrollAreaEvent.webidl
new file mode 100644
index 0000000000..47fd684bf6
--- /dev/null
+++ b/dom/webidl/ScrollAreaEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface ScrollAreaEvent : UIEvent
+{
+  readonly attribute float x;
+  readonly attribute float y;
+  readonly attribute float width;
+  readonly attribute float height;
+
+  undefined initScrollAreaEvent(DOMString type,
+                                optional boolean canBubble = false,
+                                optional boolean cancelable = false,
+                                optional Window? view = null,
+                                optional long detail = 0,
+                                optional float x = 0,
+                                optional float y = 0,
+                                optional float width = 0,
+                                optional float height = 0);
+};
diff --git a/dom/webidl/ScrollViewChangeEvent.webidl b/dom/webidl/ScrollViewChangeEvent.webidl
new file mode 100644
index 0000000000..df9f83b7b6
--- /dev/null
+++ b/dom/webidl/ScrollViewChangeEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum ScrollState {"started", "stopped"};
+
+dictionary ScrollViewChangeEventInit : EventInit {
+  ScrollState state = "started";
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface ScrollViewChangeEvent : Event {
+  constructor(DOMString type,
+              optional ScrollViewChangeEventInit eventInit = {});
+
+  readonly attribute ScrollState state;
+};
diff --git a/dom/webidl/SecurityPolicyViolationEvent.webidl b/dom/webidl/SecurityPolicyViolationEvent.webidl
new file mode 100644
index 0000000000..5578238347
--- /dev/null
+++ b/dom/webidl/SecurityPolicyViolationEvent.webidl
@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum SecurityPolicyViolationEventDisposition
+{
+  "enforce", "report"
+};
+
+[Exposed=Window]
+interface SecurityPolicyViolationEvent : Event
+{
+    constructor(DOMString type,
+                optional SecurityPolicyViolationEventInit eventInitDict = {});
+
+    readonly attribute DOMString      documentURI;
+    readonly attribute DOMString      referrer;
+    readonly attribute DOMString      blockedURI;
+    readonly attribute DOMString      violatedDirective;
+    readonly attribute DOMString      effectiveDirective;
+    readonly attribute DOMString      originalPolicy;
+    readonly attribute DOMString      sourceFile;
+    readonly attribute DOMString      sample;
+    readonly attribute SecurityPolicyViolationEventDisposition disposition;
+    readonly attribute unsigned short statusCode;
+    readonly attribute long           lineNumber;
+    readonly attribute long           columnNumber;
+};
+
+[GenerateInitFromJSON, GenerateToJSON]
+dictionary SecurityPolicyViolationEventInit : EventInit
+{
+    DOMString      documentURI = "";
+    DOMString      referrer = "";
+    DOMString      blockedURI = "";
+    DOMString      violatedDirective = "";
+    DOMString      effectiveDirective = "";
+    DOMString      originalPolicy = "";
+    DOMString      sourceFile = "";
+    DOMString      sample = "";
+    SecurityPolicyViolationEventDisposition disposition = "report";
+    unsigned short statusCode = 0;
+    long           lineNumber = 0;
+    long           columnNumber = 0;
+};
diff --git a/dom/webidl/Selection.webidl b/dom/webidl/Selection.webidl
new file mode 100644
index 0000000000..496ebc0813
--- /dev/null
+++ b/dom/webidl/Selection.webidl
@@ -0,0 +1,159 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/selection-api/#selection-interface
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface Selection {
+  [NeedsCallerType]
+  readonly attribute Node?         anchorNode;
+  [NeedsCallerType]
+  readonly attribute unsigned long anchorOffset;
+  [NeedsCallerType]
+  readonly attribute Node?         focusNode;
+  [NeedsCallerType]
+  readonly attribute unsigned long focusOffset;
+  readonly attribute boolean       isCollapsed;
+  /**
+   * Returns the number of ranges in the selection.
+   */
+  readonly attribute unsigned long rangeCount;
+  readonly attribute DOMString     type;
+  /**
+   * Returns the range at the specified index.  Throws if the index is
+   * out of range.
+   */
+  [Throws]
+  Range     getRangeAt(unsigned long index);
+  /**
+   * Adds a range to the current selection.
+   */
+  [Throws, BinaryName="addRangeJS"]
+  undefined addRange(Range range);
+  /**
+   * Removes a range from the current selection.
+   */
+  [Throws, BinaryName="removeRangeAndUnselectFramesAndNotifyListeners"]
+  undefined removeRange(Range range);
+  /**
+   * Removes all ranges from the current selection.
+   */
+  [Throws]
+  undefined removeAllRanges();
+  [Throws, BinaryName="RemoveAllRanges"]
+  undefined empty();
+  [Throws, BinaryName="collapseJS"]
+  undefined collapse(Node? node, optional unsigned long offset = 0);
+  [Throws, BinaryName="collapseJS"]
+  undefined setPosition(Node? node, optional unsigned long offset = 0);
+  [Throws, BinaryName="collapseToStartJS"]
+  undefined collapseToStart();
+  [Throws, BinaryName="collapseToEndJS"]
+  undefined collapseToEnd();
+  [Throws, BinaryName="extendJS"]
+  undefined extend(Node node, optional unsigned long offset = 0);
+  [Throws, BinaryName="setBaseAndExtentJS"]
+  undefined setBaseAndExtent(Node anchorNode,
+                             unsigned long anchorOffset,
+                             Node focusNode,
+                             unsigned long focusOffset);
+  [Throws, BinaryName="selectAllChildrenJS"]
+  undefined selectAllChildren(Node node);
+  [CEReactions, Throws]
+  undefined deleteFromDocument();
+  [Throws]
+  boolean   containsNode(Node node,
+                         optional boolean allowPartialContainment = false);
+  stringifier DOMString ();
+};
+
+// Additional methods not currently in the spec
+partial interface Selection {
+  [Throws]
+  undefined modify(DOMString alter, DOMString direction,
+                   DOMString granularity);
+};
+
+// Additional chrome-only methods.
+interface nsISelectionListener;
+partial interface Selection {
+  /**
+   * A true value means "selection after newline"; false means "selection before
+   * newline" when a selection is positioned "between lines".
+   */
+  [ChromeOnly,Throws, BinaryName=interlinePositionJS]
+  attribute boolean interlinePosition;
+
+  [Throws]
+  attribute short? caretBidiLevel;
+
+  [ChromeOnly,Throws]
+  DOMString  toStringWithFormat(DOMString formatType, unsigned long flags, long wrapColumn);
+  [ChromeOnly]
+  undefined  addSelectionListener(nsISelectionListener newListener);
+  [ChromeOnly]
+  undefined  removeSelectionListener(nsISelectionListener listenerToRemove);
+
+  [ChromeOnly,BinaryName="rawType"]
+  readonly attribute short selectionType;
+
+  /**
+   * Return array of ranges intersecting with the given DOM interval.
+   */
+  [ChromeOnly,Throws,Pref="dom.testing.selection.GetRangesForInterval"]
+  sequence<Range> GetRangesForInterval(Node beginNode, long beginOffset, Node endNode, long endOffset,
+                                       boolean allowAdjacent);
+
+  /**
+   * Scrolls a region of the selection, so that it is visible in
+   * the scrolled view.
+   *
+   * @param aRegion the region inside the selection to scroll into view
+   *                (see selection region constants defined in
+   *                nsISelectionController).
+   * @param aIsSynchronous when true, scrolls the selection into view
+   *                       before returning. If false, posts a request which
+   *                       is processed at some point after the method returns.
+   * @param aVPercent how to align the frame vertically.
+   * @param aHPercent how to align the frame horizontally.
+   */
+  [ChromeOnly,Throws]
+  undefined scrollIntoView(short aRegion, boolean aIsSynchronous, short aVPercent, short aHPercent);
+
+  /**
+   * setColors() sets custom colors for the selection.
+   * Currently, this is supported only when the selection type is SELECTION_FIND.
+   * Otherwise, throws an exception.
+   *
+   * @param aForegroundColor     The foreground color of the selection.
+   *                             If this is "currentColor", foreground color
+   *                             isn't changed by this selection.
+   * @param aBackgroundColor     The background color of the selection.
+   *                             If this is "transparent", background color is
+   *                             never painted.
+   * @param aAltForegroundColor  The alternative foreground color of the
+   *                             selection.
+   *                             If aBackgroundColor doesn't have sufficient
+   *                             contrast with its around or foreground color
+   *                             if "currentColor" is specified, alternative
+   *                             colors are used if it have higher contrast.
+   * @param aAltBackgroundColor  The alternative background color of the
+   *                             selection.
+   */
+  [ChromeOnly,Throws]
+  undefined setColors(DOMString aForegroundColor, DOMString aBackgroundColor,
+                      DOMString aAltForegroundColor, DOMString aAltBackgroundColor);
+
+  /**
+   * resetColors() forget the customized colors which were set by setColors().
+   */
+  [ChromeOnly]
+  undefined resetColors();
+};
diff --git a/dom/webidl/ServiceWorker.webidl b/dom/webidl/ServiceWorker.webidl
new file mode 100644
index 0000000000..a62790b5dc
--- /dev/null
+++ b/dom/webidl/ServiceWorker.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#service-worker-obj
+ *
+ */
+
+// Still unclear what should be subclassed.
+// https://github.com/slightlyoff/ServiceWorker/issues/189
+[Func="ServiceWorkerVisible",
+ // FIXME(nsm): Bug 1113522. This is exposed to satisfy webidl constraints, but it won't actually work.
+ Exposed=(Window,Worker)]
+interface ServiceWorker : EventTarget {
+  readonly attribute USVString scriptURL;
+  readonly attribute ServiceWorkerState state;
+
+  attribute EventHandler onstatechange;
+
+  [Throws]
+  undefined postMessage(any message, sequence<object> transferable);
+  [Throws]
+  undefined postMessage(any message, optional StructuredSerializeOptions options = {});
+};
+
+ServiceWorker includes AbstractWorker;
+
+enum ServiceWorkerState {
+  // https://github.com/w3c/ServiceWorker/issues/1162
+  "parsed",
+
+  "installing",
+  "installed",
+  "activating",
+  "activated",
+  "redundant"
+};
diff --git a/dom/webidl/ServiceWorkerContainer.webidl b/dom/webidl/ServiceWorkerContainer.webidl
new file mode 100644
index 0000000000..cecc2e01ab
--- /dev/null
+++ b/dom/webidl/ServiceWorkerContainer.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/ServiceWorker/#serviceworkercontainer
+ *
+ */
+
+[Func="ServiceWorkersEnabled",
+ Exposed=Window]
+interface ServiceWorkerContainer : EventTarget {
+  // FIXME(nsm):
+  // https://github.com/slightlyoff/ServiceWorker/issues/198
+  // and discussion at https://etherpad.mozilla.org/serviceworker07apr
+  readonly attribute ServiceWorker? controller;
+
+  [Throws]
+  readonly attribute Promise<ServiceWorkerRegistration> ready;
+
+  [NewObject, NeedsCallerType]
+  Promise<ServiceWorkerRegistration> register(USVString scriptURL,
+                                              optional RegistrationOptions options = {});
+
+  [NewObject]
+  Promise<(ServiceWorkerRegistration or undefined)> getRegistration(optional USVString documentURL = "");
+
+  [NewObject]
+  Promise<sequence<ServiceWorkerRegistration>> getRegistrations();
+
+  undefined startMessages();
+
+  attribute EventHandler oncontrollerchange;
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+};
+
+// Testing only.
+partial interface ServiceWorkerContainer {
+  [Throws,Pref="dom.serviceWorkers.testing.enabled"]
+  DOMString getScopeForUrl(DOMString url);
+};
+
+dictionary RegistrationOptions {
+  USVString scope;
+  ServiceWorkerUpdateViaCache updateViaCache = "imports";
+};
diff --git a/dom/webidl/ServiceWorkerGlobalScope.webidl b/dom/webidl/ServiceWorkerGlobalScope.webidl
new file mode 100644
index 0000000000..914fc37c8b
--- /dev/null
+++ b/dom/webidl/ServiceWorkerGlobalScope.webidl
@@ -0,0 +1,49 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ * http://w3c.github.io/push-api/
+ * https://notifications.spec.whatwg.org/
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Global=(Worker,ServiceWorker),
+ Exposed=ServiceWorker]
+interface ServiceWorkerGlobalScope : WorkerGlobalScope {
+  [SameObject, BinaryName="GetClients"]
+  readonly attribute Clients clients;
+  [SameObject] readonly attribute ServiceWorkerRegistration registration;
+
+  [Throws, NewObject]
+  Promise<undefined> skipWaiting();
+
+  attribute EventHandler oninstall;
+  attribute EventHandler onactivate;
+
+  attribute EventHandler onfetch;
+
+  // The event.source of these MessageEvents are instances of Client
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+};
+
+// These are from w3c.github.io/push-api/
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler onpush;
+  attribute EventHandler onpushsubscriptionchange;
+};
+
+// https://notifications.spec.whatwg.org/
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler onnotificationclick;
+  attribute EventHandler onnotificationclose;
+};
+
+// Mixin the WebExtensions API globals (the actual properties are only available to
+// extension service workers, locked behind a Func="extensions::ExtensionAPIAllowed" annotation).
+ServiceWorkerGlobalScope includes ExtensionGlobalsMixin;
diff --git a/dom/webidl/ServiceWorkerRegistration.webidl b/dom/webidl/ServiceWorkerRegistration.webidl
new file mode 100644
index 0000000000..aba169b622
--- /dev/null
+++ b/dom/webidl/ServiceWorkerRegistration.webidl
@@ -0,0 +1,54 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html
+ * https://w3c.github.io/push-api/
+ * https://notifications.spec.whatwg.org/
+ */
+
+[Func="ServiceWorkerVisible",
+ Exposed=(Window,Worker)]
+interface ServiceWorkerRegistration : EventTarget {
+  readonly attribute ServiceWorker? installing;
+  readonly attribute ServiceWorker? waiting;
+  readonly attribute ServiceWorker? active;
+
+  [Pref="dom.serviceWorkers.navigationPreload.enabled", SameObject]
+  readonly attribute NavigationPreloadManager navigationPreload;
+
+  readonly attribute USVString scope;
+  [Throws]
+  readonly attribute ServiceWorkerUpdateViaCache updateViaCache;
+
+  [Throws, NewObject]
+  Promise<undefined> update();
+
+  [Throws, NewObject]
+  Promise<boolean> unregister();
+
+  // event
+  attribute EventHandler onupdatefound;
+};
+
+enum ServiceWorkerUpdateViaCache {
+  "imports",
+  "all",
+  "none"
+};
+
+// https://w3c.github.io/push-api/
+partial interface ServiceWorkerRegistration {
+  [Throws, Exposed=(Window,Worker), Pref="dom.push.enabled"]
+  readonly attribute PushManager pushManager;
+};
+
+// https://notifications.spec.whatwg.org/
+partial interface ServiceWorkerRegistration {
+  [NewObject, Pref="dom.webnotifications.serviceworker.enabled"]
+  Promise<undefined> showNotification(DOMString title, optional NotificationOptions options = {});
+  [NewObject, Pref="dom.webnotifications.serviceworker.enabled"]
+  Promise<sequence<Notification>> getNotifications(optional GetNotificationOptions filter = {});
+};
diff --git a/dom/webidl/ShadowRealmGlobalScope.webidl b/dom/webidl/ShadowRealmGlobalScope.webidl
new file mode 100644
index 0000000000..5593a9b2c7
--- /dev/null
+++ b/dom/webidl/ShadowRealmGlobalScope.webidl
@@ -0,0 +1,11 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// This interface exists purely to register a new global as part of
+// code generation so that we can properly hook this into
+// shadow realms.
+[Global=(ShadowRealmGlobal), Exposed=ShadowRealmGlobal, LegacyNoInterfaceObject]
+interface ShadowRealmGlobalScope { };
diff --git a/dom/webidl/ShadowRoot.webidl b/dom/webidl/ShadowRoot.webidl
new file mode 100644
index 0000000000..372c5e5919
--- /dev/null
+++ b/dom/webidl/ShadowRoot.webidl
@@ -0,0 +1,60 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+// https://dom.spec.whatwg.org/#enumdef-shadowrootmode
+enum ShadowRootMode {
+  "open",
+  "closed"
+};
+
+enum SlotAssignmentMode { "manual", "named" };
+
+// https://dom.spec.whatwg.org/#shadowroot
+[Exposed=Window]
+interface ShadowRoot : DocumentFragment
+{
+  // Shadow DOM v1
+  readonly attribute ShadowRootMode mode;
+  [Pref="dom.shadowdom.delegatesFocus.enabled"]
+  readonly attribute boolean delegatesFocus;
+  [Pref="dom.shadowdom.slot.assign.enabled"]
+  readonly attribute SlotAssignmentMode slotAssignment;
+  readonly attribute Element host;
+  attribute EventHandler onslotchange;
+
+  Element? getElementById(DOMString elementId);
+
+  // https://w3c.github.io/DOM-Parsing/#the-innerhtml-mixin
+  [CEReactions, SetterThrows]
+  attribute [LegacyNullToEmptyString] DOMString innerHTML;
+
+  // When JS invokes importNode or createElement, the binding code needs to
+  // create a reflector, and so invoking those methods directly on the content
+  // document would cause the reflector to be created in the content scope,
+  // at which point it would be difficult to move into the UA Widget scope.
+  // As such, these methods allow UA widget code to simultaneously create nodes
+  // and associate them with the UA widget tree, so that the reflectors get
+  // created in the right scope.
+  [CEReactions, Throws, Func="IsChromeOrUAWidget"]
+  Node importNodeAndAppendChildAt(Node parentNode, Node node, optional boolean deep = false);
+
+  [CEReactions, Throws, Func="IsChromeOrUAWidget"]
+  Node createElementAndAppendChildAt(Node parentNode, DOMString localName);
+
+  // For triggering UA Widget scope in tests.
+  [ChromeOnly]
+  undefined setIsUAWidget();
+  [ChromeOnly]
+  boolean isUAWidget();
+};
+
+ShadowRoot includes DocumentOrShadowRoot;
diff --git a/dom/webidl/SharedWorker.webidl b/dom/webidl/SharedWorker.webidl
new file mode 100644
index 0000000000..3a4d9b3ebe
--- /dev/null
+++ b/dom/webidl/SharedWorker.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface SharedWorker : EventTarget {
+    [Throws]
+    constructor(USVString scriptURL,
+                optional (DOMString or WorkerOptions) options = {});
+
+    readonly attribute MessagePort port;
+};
+
+SharedWorker includes AbstractWorker;
diff --git a/dom/webidl/SharedWorkerGlobalScope.webidl b/dom/webidl/SharedWorkerGlobalScope.webidl
new file mode 100644
index 0000000000..c0ff63217d
--- /dev/null
+++ b/dom/webidl/SharedWorkerGlobalScope.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/workers.html#the-workerglobalscope-common-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Global=(Worker,SharedWorker),
+ Exposed=SharedWorker]
+interface SharedWorkerGlobalScope : WorkerGlobalScope {
+  [Replaceable]
+  readonly attribute DOMString name;
+
+  undefined close();
+
+  attribute EventHandler onconnect;
+};
diff --git a/dom/webidl/SimpleGestureEvent.webidl b/dom/webidl/SimpleGestureEvent.webidl
new file mode 100644
index 0000000000..048f49df48
--- /dev/null
+++ b/dom/webidl/SimpleGestureEvent.webidl
@@ -0,0 +1,201 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * The SimpleGestureEvent interface is the datatype for all
+ * Mozilla-specific simple gesture events in the Document Object Model.
+ *
+ * The following events are generated:
+ *
+ * MozSwipeGestureMayStart - Generated when the user starts a horizontal
+ * swipe across the input device, but before we know whether the user
+ * is actually scrolling past a scroll edge.
+ * This event asks two questions:  Should a swipe really be started, and
+ * in which directions should the user be able to swipe?  The first
+ * question is answered by event listeners by calling or not calling
+ * preventDefault() on the event.  Since a swipe swallows all scroll
+ * events, the default action of the swipe start event is *not* to
+ * start a swipe. Call preventDefault() if you want a swipe to be
+ * started. Doing so won't necessarily result in a swipe being started,
+ * it only communicates an intention. Once Gecko determines whether a
+ * swipe should actually be started, it will send a MozSwipeGestureStart
+ * event.
+ * The second question (swipe-able directions) is answered in the
+ * allowedDirections field.
+ *
+ * MozSwipeGestureStart - This event signals the start of a swipe.
+ * It guarantees a future MozSwipeGestureEnd event that will signal
+ * the end of a swipe animation.
+ *
+ * MozSwipeGestureUpdate - Generated periodically while the user is
+ * continuing a horizontal swipe gesture.  The "delta" value represents
+ * the current absolute gesture amount.  This event may even be sent
+ * after a MozSwipeGesture event fired in order to allow for fluid
+ * completion of a swipe animation.  The direction value is meaningless
+ * on swipe update events.
+ *
+ * MozSwipeGestureEnd - Generated when the swipe animation is completed.
+ *
+ * MozSwipeGesture - Generated when the user releases a swipe across
+ * across the input device.  This event signals that the actual swipe
+ * operation is complete, even though the animation might not be finished
+ * yet.  This event can be sent without accompanying start / update / end
+ * events, and it can also be handled on its own if the consumer doesn't
+ * want to handle swipe animation events.
+ * Only the direction value has any significance, the delta value is
+ * meaningless.
+ *
+ * MozMagnifyGestureStart - Generated when the user begins the magnify
+ * ("pinch") gesture.  The "delta" value represents the initial
+ * movement.
+ *
+ * MozMagnifyGestureUpdate - Generated periodically while the user is
+ * continuing the magnify ("pinch") gesture.  The "delta" value
+ * represents the movement since the last MozMagnifyGestureStart or
+ * MozMagnifyGestureUpdate event.
+ *
+ * MozMagnifyGesture - Generated when the user has completed the
+ * magnify ("pinch") gesture.  If you only want to receive a single
+ * event when the magnify gesture is complete, you only need to hook
+ * this event and can safely ignore the MozMagnifyGestureStart and the
+ * MozMagnifyGestureUpdate events. The "delta" value is the cumulative
+ * amount represented by the user's gesture.
+ *
+ * MozRotateGestureStart - Generated when the user begins the rotation
+ * gesture.  The "delta" value represents the initial rotation.
+ *
+ * MozRotateGestureUpdate - Generated periodically while the user is
+ * continuing the rotation gesture.  The "delta" value represents the
+ * rotation since the last MozRotateGestureStart or
+ * MozRotateGestureUpdate event.
+ *
+ * MozRotateGesture - Generated when the user has completed the
+ * rotation gesture.  If you only want to receive a single event when
+ * the rotation gesture is complete, you only need to hook this event
+ * and can safely ignore the MozRotateGestureStart and the
+ * MozRotateGestureUpdate events.  The "delta" value is the cumulative
+ * amount of rotation represented by the user's gesture.
+ *
+ * MozTapGesture - Generated when the user executes a two finger
+ * tap gesture on the input device. Client coordinates contain the
+ * center point of the tap.
+ * (XXX On OS X, only Lion (10.7) and up)
+ *
+ * MozPressTapGesture - Generated when the user executes a press
+ * and tap two finger gesture (first finger down, second finger down,
+ * second finger up, first finger up) on the input device.
+ * Client coordinates contain the center pivot point of the action.
+ * (XXX Not implemented on Mac)
+ *
+ * MozEdgeUIGesture - Generated when the user swipes the display to
+ * invoke edge ui.
+ * (XXX Win8 only)
+ *
+ * Default behavior:
+ *
+ * Some operating systems support default behaviors for gesture events
+ * when they are not handled by the application. Consumers should
+ * use event.preventDefault() to prevent default behavior when
+ * consuming events.
+ */
+
+[ChromeOnly,
+ Exposed=Window]
+interface SimpleGestureEvent : MouseEvent
+{
+  /* Swipe direction constants */
+  const unsigned long DIRECTION_UP = 1;
+  const unsigned long DIRECTION_DOWN = 2;
+  const unsigned long DIRECTION_LEFT = 4;
+  const unsigned long DIRECTION_RIGHT = 8;
+
+  /* Rotational direction constants */
+  const unsigned long ROTATION_COUNTERCLOCKWISE = 1;
+  const unsigned long ROTATION_CLOCKWISE = 2;
+
+  /* Read-write value for swipe events.
+   *
+   * Reports the directions that can be swiped to; multiple directions
+   * should be OR'ed together.
+   *
+   * The allowedDirections field is designed to be set on SwipeGestureMayStart
+   * events by event listeners.  Its value after event dispatch determines
+   * the behavior of the swipe animation that might be about to begin.
+   * Specifically, if the user swipes in a direction that can't be swiped
+   * to, the animation will have a bounce effect.
+   * Future SwipeGestureUpdate, SwipeGesture and SwipeGestureEnd events
+   * will carry the allowDirections value that was set on the SwipeMayStart
+   * event.  Changing this field on non-SwipeGestureMayStart events doesn't
+   * have any effect.
+   */
+  attribute unsigned long allowedDirections;
+
+  /* Direction of a gesture. Diagonals are indicated by OR'ing the
+   * applicable constants together.
+   *
+   * Swipes gestures may occur in any direction.
+   *
+   * Magnify gestures do not have a direction.
+   *
+   * Rotation gestures will be either ROTATION_COUNTERCLOCKWISE or
+   * ROTATION_CLOCKWISE.
+   */
+  readonly attribute unsigned long direction;
+
+  /* Delta value for magnify, rotate and swipe gestures.
+   *
+   * For rotation, the value is in degrees and is positive for
+   * clockwise rotation and negative for counterclockwise
+   * rotation.
+   *
+   * For magnification, the value will be positive for a "zoom in"
+   * (i.e, increased magnification) and negative for a "zoom out"
+   * (i.e., decreased magnification).  The particular units
+   * represented by the "delta" are currently implementation specific.
+   *
+   * XXX - The units for measuring magnification are currently
+   * unspecified because the units used by Mac OS X are currently
+   * undocumented.  The values are typically in the range of 0.0 to
+   * 100.0, but it is only safe currently to rely on the delta being
+   * positive or negative.
+   *
+   * For swipe start, update and end events, the value is a fraction
+   * of one "page".  If the resulting swipe will have DIRECTION_LEFT, the
+   * delta value will be positive; for DIRECTION_RIGHT, delta is negative.
+   * If this seems backwards to you, look at it this way:  If the current
+   * page is pushed to the right during the animation (positive delta),
+   * the page left to the current page will be visible after the swipe
+   * (DIRECTION_LEFT).
+   *
+   * Units on Windows represent the difference between the initial
+   * and current/final width between the two touch points on the input
+   * device and are measured in pixels.
+   */
+  readonly attribute double delta;
+
+  /* Click count value for taps. */
+  readonly attribute unsigned long clickCount;
+
+  undefined initSimpleGestureEvent(DOMString typeArg,
+                                   optional boolean canBubbleArg = false,
+                                   optional boolean cancelableArg = false,
+                                   optional Window? viewArg = null,
+                                   optional long detailArg = 0,
+                                   optional long screenXArg = 0,
+                                   optional long screenYArg = 0,
+                                   optional long clientXArg = 0,
+                                   optional long clientYArg = 0,
+                                   optional boolean ctrlKeyArg = false,
+                                   optional boolean altKeyArg = false,
+                                   optional boolean shiftKeyArg = false,
+                                   optional boolean metaKeyArg = false,
+                                   optional short buttonArg = 0,
+                                   optional EventTarget? relatedTargetArg = null,
+                                   optional unsigned long allowedDirectionsArg = 0,
+                                   optional unsigned long directionArg = 0,
+                                   optional double deltaArg = 0,
+                                   optional unsigned long clickCount = 0);
+};
diff --git a/dom/webidl/SocketCommon.webidl b/dom/webidl/SocketCommon.webidl
new file mode 100644
index 0000000000..044199ea2b
--- /dev/null
+++ b/dom/webidl/SocketCommon.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/2012/sysapps/tcp-udp-sockets/#readystate
+ */
+
+enum SocketReadyState {
+    "opening",
+    "open",
+    "closing",
+    "closed",
+    "halfclosed"
+};
diff --git a/dom/webidl/SourceBuffer.webidl b/dom/webidl/SourceBuffer.webidl
new file mode 100644
index 0000000000..0ca93422ec
--- /dev/null
+++ b/dom/webidl/SourceBuffer.webidl
@@ -0,0 +1,67 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum SourceBufferAppendMode {
+    "segments",
+    "sequence"
+};
+
+[Pref="media.mediasource.enabled",
+ Exposed=Window]
+interface SourceBuffer : EventTarget {
+  [SetterThrows]
+  attribute SourceBufferAppendMode mode;
+  readonly attribute boolean updating;
+  [Throws]
+  readonly attribute TimeRanges buffered;
+  [SetterThrows]
+  attribute double timestampOffset;
+  //readonly attribute AudioTrackList audioTracks;
+  //readonly attribute VideoTrackList videoTracks;
+  //readonly attribute TextTrackList textTracks;
+  [SetterThrows]
+  attribute double appendWindowStart;
+  [SetterThrows]
+  attribute unrestricted double appendWindowEnd;
+  attribute EventHandler onupdatestart;
+  attribute EventHandler onupdate;
+  attribute EventHandler onupdateend;
+  attribute EventHandler onerror;
+  attribute EventHandler onabort;
+  [Throws]
+  undefined appendBuffer(ArrayBuffer data);
+  [Throws]
+  undefined appendBuffer(ArrayBufferView data);
+  //[Throws]
+  //undefined appendStream(Stream stream, [EnforceRange] optional unsigned long long maxSize);
+  [Throws]
+  undefined abort();
+  [Throws]
+  undefined remove(double start, unrestricted double end);
+};
+
+// Mozilla extensions for experimental features
+partial interface SourceBuffer {
+  // Experimental function as proposed in:
+  // https://github.com/w3c/media-source/issues/100 for promise proposal.
+  [NewObject, Pref="media.mediasource.experimental.enabled"]
+  Promise<undefined> appendBufferAsync(ArrayBuffer data);
+  [NewObject, Pref="media.mediasource.experimental.enabled"]
+  Promise<undefined> appendBufferAsync(ArrayBufferView data);
+  [NewObject, Pref="media.mediasource.experimental.enabled"]
+  Promise<undefined> removeAsync(double start, unrestricted double end);
+
+  // Experimental function as proposed in:
+  // https://github.com/w3c/media-source/issues/155
+  [Throws]
+  undefined changeType(DOMString type);
+};
diff --git a/dom/webidl/SourceBufferList.webidl b/dom/webidl/SourceBufferList.webidl
new file mode 100644
index 0000000000..ff5d85fa34
--- /dev/null
+++ b/dom/webidl/SourceBufferList.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.mediasource.enabled",
+ Exposed=Window]
+interface SourceBufferList : EventTarget {
+  readonly attribute unsigned long length;
+  attribute EventHandler onaddsourcebuffer;
+  attribute EventHandler onremovesourcebuffer;
+  getter SourceBuffer (unsigned long index);
+};
diff --git a/dom/webidl/SpeechGrammar.webidl b/dom/webidl/SpeechGrammar.webidl
new file mode 100644
index 0000000000..4e74a94fd2
--- /dev/null
+++ b/dom/webidl/SpeechGrammar.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.recognition.enable",
+ LegacyFactoryFunction=webkitSpeechGrammar,
+ Func="SpeechRecognition::IsAuthorized",
+ Exposed=Window]
+interface SpeechGrammar {
+    constructor();
+
+    [Throws]
+    attribute DOMString src;
+    [Throws]
+    attribute float weight;
+};
diff --git a/dom/webidl/SpeechGrammarList.webidl b/dom/webidl/SpeechGrammarList.webidl
new file mode 100644
index 0000000000..d45c11c25a
--- /dev/null
+++ b/dom/webidl/SpeechGrammarList.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.recognition.enable",
+ LegacyFactoryFunction=webkitSpeechGrammarList,
+ Func="SpeechRecognition::IsAuthorized",
+ Exposed=Window]
+interface SpeechGrammarList {
+    constructor();
+
+    readonly attribute unsigned long length;
+    [Throws]
+    getter SpeechGrammar item(unsigned long index);
+    [Throws]
+    undefined addFromURI(DOMString src, optional float weight);
+    [Throws]
+    undefined addFromString(DOMString string, optional float weight);
+};
diff --git a/dom/webidl/SpeechRecognition.webidl b/dom/webidl/SpeechRecognition.webidl
new file mode 100644
index 0000000000..cae6a44536
--- /dev/null
+++ b/dom/webidl/SpeechRecognition.webidl
@@ -0,0 +1,49 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.recognition.enable",
+ LegacyFactoryFunction=webkitSpeechRecognition,
+ Func="SpeechRecognition::IsAuthorized",
+ Exposed=Window]
+interface SpeechRecognition : EventTarget {
+    [Throws]
+    constructor();
+
+    // recognition parameters
+    attribute SpeechGrammarList grammars;
+    attribute DOMString lang;
+    [Throws]
+    attribute boolean continuous;
+    attribute boolean interimResults;
+    attribute unsigned long maxAlternatives;
+    [Throws]
+    attribute DOMString serviceURI;
+
+    // methods to drive the speech interaction
+    [Throws, NeedsCallerType]
+    undefined start(optional MediaStream stream);
+    undefined stop();
+    undefined abort();
+
+    // event methods
+    attribute EventHandler onaudiostart;
+    attribute EventHandler onsoundstart;
+    attribute EventHandler onspeechstart;
+    attribute EventHandler onspeechend;
+    attribute EventHandler onsoundend;
+    attribute EventHandler onaudioend;
+    attribute EventHandler onresult;
+    attribute EventHandler onnomatch;
+    attribute EventHandler onerror;
+    attribute EventHandler onstart;
+    attribute EventHandler onend;
+};
diff --git a/dom/webidl/SpeechRecognitionAlternative.webidl b/dom/webidl/SpeechRecognitionAlternative.webidl
new file mode 100644
index 0000000000..746c6b125b
--- /dev/null
+++ b/dom/webidl/SpeechRecognitionAlternative.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized",
+ Exposed=Window]
+interface SpeechRecognitionAlternative {
+    readonly attribute DOMString transcript;
+    readonly attribute float confidence;
+};
diff --git a/dom/webidl/SpeechRecognitionError.webidl b/dom/webidl/SpeechRecognitionError.webidl
new file mode 100644
index 0000000000..7e1905eece
--- /dev/null
+++ b/dom/webidl/SpeechRecognitionError.webidl
@@ -0,0 +1,34 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+enum SpeechRecognitionErrorCode {
+  "no-speech",
+  "aborted",
+  "audio-capture",
+  "network",
+  "not-allowed",
+  "service-not-allowed",
+  "bad-grammar",
+  "language-not-supported"
+};
+
+[Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized",
+ Exposed=Window]
+interface SpeechRecognitionError : Event
+{
+  constructor(DOMString type,
+              optional SpeechRecognitionErrorInit eventInitDict = {});
+
+  readonly attribute SpeechRecognitionErrorCode error;
+  readonly attribute DOMString? message;
+};
+
+dictionary SpeechRecognitionErrorInit : EventInit
+{
+  SpeechRecognitionErrorCode error = "no-speech";
+  DOMString message = "";
+};
diff --git a/dom/webidl/SpeechRecognitionEvent.webidl b/dom/webidl/SpeechRecognitionEvent.webidl
new file mode 100644
index 0000000000..8dc3fd77ac
--- /dev/null
+++ b/dom/webidl/SpeechRecognitionEvent.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+interface nsISupports;
+
+[Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized",
+ Exposed=Window]
+interface SpeechRecognitionEvent : Event
+{
+  constructor(DOMString type,
+              optional SpeechRecognitionEventInit eventInitDict = {});
+
+  readonly attribute unsigned long resultIndex;
+  readonly attribute SpeechRecognitionResultList? results;
+  readonly attribute any interpretation;
+  readonly attribute Document? emma;
+};
+
+dictionary SpeechRecognitionEventInit : EventInit
+{
+  unsigned long resultIndex = 0;
+  SpeechRecognitionResultList? results = null;
+  any interpretation = null;
+  Document? emma = null;
+};
diff --git a/dom/webidl/SpeechRecognitionResult.webidl b/dom/webidl/SpeechRecognitionResult.webidl
new file mode 100644
index 0000000000..46cf650781
--- /dev/null
+++ b/dom/webidl/SpeechRecognitionResult.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized",
+ Exposed=Window]
+interface SpeechRecognitionResult {
+    readonly attribute unsigned long length;
+    getter SpeechRecognitionAlternative item(unsigned long index);
+    readonly attribute boolean isFinal;
+};
diff --git a/dom/webidl/SpeechRecognitionResultList.webidl b/dom/webidl/SpeechRecognitionResultList.webidl
new file mode 100644
index 0000000000..eb11edc976
--- /dev/null
+++ b/dom/webidl/SpeechRecognitionResultList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.recognition.enable",
+ Func="SpeechRecognition::IsAuthorized",
+ Exposed=Window]
+interface SpeechRecognitionResultList {
+    readonly attribute unsigned long length;
+    getter SpeechRecognitionResult item(unsigned long index);
+};
diff --git a/dom/webidl/SpeechSynthesis.webidl b/dom/webidl/SpeechSynthesis.webidl
new file mode 100644
index 0000000000..fc6583be86
--- /dev/null
+++ b/dom/webidl/SpeechSynthesis.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.synth.enabled",
+ Exposed=Window]
+interface SpeechSynthesis : EventTarget{
+  readonly attribute boolean pending;
+  readonly attribute boolean speaking;
+  readonly attribute boolean paused;
+
+  undefined speak(SpeechSynthesisUtterance utterance);
+  undefined cancel();
+  undefined pause();
+  undefined resume();
+  sequence<SpeechSynthesisVoice> getVoices();
+
+  attribute EventHandler onvoiceschanged;
+
+  [ChromeOnly]
+  // Force an utterance to end. Circumvents bad speech service implementations.
+  undefined forceEnd();
+};
diff --git a/dom/webidl/SpeechSynthesisErrorEvent.webidl b/dom/webidl/SpeechSynthesisErrorEvent.webidl
new file mode 100644
index 0000000000..baab54f025
--- /dev/null
+++ b/dom/webidl/SpeechSynthesisErrorEvent.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum SpeechSynthesisErrorCode {
+  "canceled",
+  "interrupted",
+  "audio-busy",
+  "audio-hardware",
+  "network",
+  "synthesis-unavailable",
+  "synthesis-failed",
+  "language-unavailable",
+  "voice-unavailable",
+  "text-too-long",
+  "invalid-argument",
+};
+
+[Pref="media.webspeech.synth.enabled",
+ Exposed=Window]
+interface SpeechSynthesisErrorEvent : SpeechSynthesisEvent {
+  constructor(DOMString type, SpeechSynthesisErrorEventInit eventInitDict);
+
+  readonly attribute SpeechSynthesisErrorCode error;
+};
+
+dictionary SpeechSynthesisErrorEventInit : SpeechSynthesisEventInit
+{
+  required SpeechSynthesisErrorCode error;
+};
diff --git a/dom/webidl/SpeechSynthesisEvent.webidl b/dom/webidl/SpeechSynthesisEvent.webidl
new file mode 100644
index 0000000000..7eabe1096b
--- /dev/null
+++ b/dom/webidl/SpeechSynthesisEvent.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.synth.enabled",
+ Exposed=Window]
+interface SpeechSynthesisEvent : Event
+{
+  constructor(DOMString type, SpeechSynthesisEventInit eventInitDict);
+
+  readonly attribute SpeechSynthesisUtterance utterance;
+  readonly attribute unsigned long charIndex;
+  readonly attribute unsigned long? charLength;
+  readonly attribute float elapsedTime;
+  readonly attribute DOMString? name;
+};
+
+dictionary SpeechSynthesisEventInit : EventInit
+{
+  required SpeechSynthesisUtterance utterance;
+  unsigned long charIndex = 0;
+  unsigned long? charLength = null;
+  float elapsedTime = 0;
+  DOMString name = "";
+};
diff --git a/dom/webidl/SpeechSynthesisUtterance.webidl b/dom/webidl/SpeechSynthesisUtterance.webidl
new file mode 100644
index 0000000000..334b1adf91
--- /dev/null
+++ b/dom/webidl/SpeechSynthesisUtterance.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.synth.enabled",
+ Exposed=Window]
+interface SpeechSynthesisUtterance : EventTarget {
+  [Throws]
+  constructor();
+  [Throws]
+  constructor(DOMString text);
+
+  attribute DOMString text;
+  attribute DOMString lang;
+  attribute SpeechSynthesisVoice? voice;
+  attribute float volume;
+  attribute float rate;
+  attribute float pitch;
+
+  attribute EventHandler onstart;
+  attribute EventHandler onend;
+  attribute EventHandler onerror;
+  attribute EventHandler onpause;
+  attribute EventHandler onresume;
+  attribute EventHandler onmark;
+  attribute EventHandler onboundary;
+
+  [ChromeOnly]
+  readonly attribute DOMString chosenVoiceURI;
+};
diff --git a/dom/webidl/SpeechSynthesisVoice.webidl b/dom/webidl/SpeechSynthesisVoice.webidl
new file mode 100644
index 0000000000..a457b9593b
--- /dev/null
+++ b/dom/webidl/SpeechSynthesisVoice.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.webspeech.synth.enabled",
+ Exposed=Window]
+interface SpeechSynthesisVoice {
+  readonly attribute DOMString voiceURI;
+  readonly attribute DOMString name;
+  readonly attribute DOMString lang;
+  readonly attribute boolean localService;
+  readonly attribute boolean default;
+};
diff --git a/dom/webidl/StaticRange.webidl b/dom/webidl/StaticRange.webidl
new file mode 100644
index 0000000000..be4e702389
--- /dev/null
+++ b/dom/webidl/StaticRange.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dom.spec.whatwg.org/#staticrange
+ *
+ * Copyright  2012 W3C  (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface StaticRange : AbstractRange {
+  [Throws]
+  constructor(StaticRangeInit init);
+  // And no additional functions/properties.
+};
+
+dictionary StaticRangeInit {
+  required Node startContainer;
+  required unsigned long startOffset;
+  required Node endContainer;
+  required unsigned long endOffset;
+};
diff --git a/dom/webidl/StereoPannerNode.webidl b/dom/webidl/StereoPannerNode.webidl
new file mode 100644
index 0000000000..1a5313f936
--- /dev/null
+++ b/dom/webidl/StereoPannerNode.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary StereoPannerOptions : AudioNodeOptions {
+             float pan = 0;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface StereoPannerNode : AudioNode {
+  [Throws]
+  constructor(BaseAudioContext context,
+              optional StereoPannerOptions options = {});
+
+  readonly attribute AudioParam pan;
+};
+
+// Mozilla extension
+StereoPannerNode includes AudioNodePassThrough;
diff --git a/dom/webidl/Storage.webidl b/dom/webidl/Storage.webidl
new file mode 100644
index 0000000000..5ee5e2c737
--- /dev/null
+++ b/dom/webidl/Storage.webidl
@@ -0,0 +1,101 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+* License, v. 2.0. If a copy of the MPL was not distributed with this file,
+* You can obtain one at http://mozilla.org/MPL/2.0/.
+*
+* The origin of this IDL file is
+* http://www.whatwg.org/html/#the-storage-interface
+*
+* © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+* Opera Software ASA. You are granted a license to use, reproduce
+* and create derivative works of this document.
+*/
+
+[Exposed=Window]
+interface Storage {
+  [Throws, NeedsSubjectPrincipal]
+  readonly attribute unsigned long length;
+
+  [Throws, NeedsSubjectPrincipal]
+  DOMString? key(unsigned long index);
+
+  [Throws, NeedsSubjectPrincipal]
+  getter DOMString? getItem(DOMString key);
+
+  [Throws, NeedsSubjectPrincipal]
+  setter undefined setItem(DOMString key, DOMString value);
+
+  [Throws, NeedsSubjectPrincipal]
+  deleter undefined removeItem(DOMString key);
+
+  [Throws, NeedsSubjectPrincipal]
+  undefined clear();
+
+  [ChromeOnly]
+  readonly attribute boolean isSessionOnly;
+};
+
+/**
+ * Testing methods that exist only for the benefit of automated glass-box
+ * testing.  Will never be exposed to content at large and unlikely to be useful
+ * in a WebDriver context.
+ */
+partial interface Storage {
+  /**
+   * Does a security-check and ensures the underlying database has been opened
+   * without actually calling any database methods.  (Read-only methods will
+   * have a similar effect but also impact the state of the snapshot.)
+   */
+  [Throws, NeedsSubjectPrincipal, Pref="dom.storage.testing"]
+  undefined open();
+
+  /**
+   * Automatically ends any explicit snapshot and drops the reference to the
+   * underlying database, but does not otherwise perturb the database.
+   */
+  [Throws, NeedsSubjectPrincipal, Pref="dom.storage.testing"]
+  undefined close();
+
+  /**
+   * Ensures the database has been opened and initiates an explicit snapshot.
+   * Snapshots are normally automatically ended and checkpointed back to the
+   * parent, but explicitly opened snapshots must be explicitly ended via
+   * `endExplicitSnapshot` or `close`.
+   */
+  [Throws, NeedsSubjectPrincipal, Pref="dom.storage.testing"]
+  undefined beginExplicitSnapshot();
+
+  /**
+   * Checkpoints the explicitly begun snapshot. This is only useful for testing
+   * of snapshot re-using when multiple checkpoints are involved. There's no
+   * need to call this before `endExplicitSnapshot` because it checkpoints the
+   * snapshot before it's ended.
+   */
+  [Throws, NeedsSubjectPrincipal, Pref="dom.storage.testing"]
+  undefined checkpointExplicitSnapshot();
+
+  /**
+   * Ends the explicitly begun snapshot and retains the underlying database.
+   * Compare with `close` which also drops the reference to the database.
+   */
+  [Throws, NeedsSubjectPrincipal, Pref="dom.storage.testing"]
+  undefined endExplicitSnapshot();
+
+  /**
+   * Returns true if the underlying database has been opened, the database is
+   * not being closed and it has a snapshot (initialized implicitly or
+   * explicitly).
+   */
+  [Throws, NeedsSubjectPrincipal, Pref="dom.storage.testing"]
+  readonly attribute boolean hasSnapshot;
+
+  /**
+   * Returns snapshot usage.
+   *
+   * @throws NS_ERROR_NOT_AVAILABLE if the underlying database hasn't been
+   *         opened or the database is being closed or it doesn't have a
+   *         snapshot.
+   */
+  [Throws, NeedsSubjectPrincipal, Pref="dom.storage.testing"]
+  readonly attribute long long snapshotUsage;
+};
diff --git a/dom/webidl/StorageEvent.webidl b/dom/webidl/StorageEvent.webidl
new file mode 100644
index 0000000000..b41d144603
--- /dev/null
+++ b/dom/webidl/StorageEvent.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Interface for a client side storage. See
+ * http://dev.w3.org/html5/webstorage/#the-storage-event
+ * for more information.
+ *
+ * Event sent to a window when a storage area changes.
+ */
+
+[Exposed=Window]
+interface StorageEvent : Event
+{
+  constructor(DOMString type, optional StorageEventInit eventInitDict = {});
+
+  readonly attribute DOMString? key;
+  readonly attribute DOMString? oldValue;
+  readonly attribute DOMString? newValue;
+  readonly attribute DOMString? url;
+  readonly attribute Storage? storageArea;
+
+  // Bug 1016053 - This is not spec compliant.
+  undefined initStorageEvent(DOMString type,
+                             optional boolean canBubble = false,
+                             optional boolean cancelable = false,
+                             optional DOMString? key = null,
+                             optional DOMString? oldValue = null,
+                             optional DOMString? newValue = null,
+                             optional DOMString? url = null,
+                             optional Storage? storageArea = null);
+};
+
+dictionary StorageEventInit : EventInit
+{
+  DOMString? key = null;
+  DOMString? oldValue = null;
+  DOMString? newValue = null;
+  DOMString url = "";
+  Storage? storageArea = null;
+};
diff --git a/dom/webidl/StorageManager.webidl b/dom/webidl/StorageManager.webidl
new file mode 100644
index 0000000000..45927bd62b
--- /dev/null
+++ b/dom/webidl/StorageManager.webidl
@@ -0,0 +1,45 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://storage.spec.whatwg.org/#storagemanager
+ *
+ */
+
+[SecureContext,
+ Exposed=(Window,Worker),
+ Pref="dom.storageManager.enabled"]
+interface StorageManager {
+  [NewObject]
+  Promise<boolean> persisted();
+
+  [Exposed=Window, NewObject]
+  Promise<boolean> persist();
+
+  [NewObject]
+  Promise<StorageEstimate> estimate();
+};
+
+dictionary StorageEstimate {
+  unsigned long long usage;
+  unsigned long long quota;
+};
+
+[SecureContext]
+partial interface StorageManager {
+  [Pref="dom.fs.enabled", NewObject]
+  Promise<FileSystemDirectoryHandle> getDirectory();
+};
+
+/**
+ * Testing methods that exist only for the benefit of automated glass-box
+ * testing.  Will never be exposed to content at large and unlikely to be useful
+ * in a WebDriver context.
+ */
+[SecureContext]
+partial interface StorageManager {
+  [ChromeOnly]
+  undefined shutdown();
+};
diff --git a/dom/webidl/StreamFilter.webidl b/dom/webidl/StreamFilter.webidl
new file mode 100644
index 0000000000..a45b392dc0
--- /dev/null
+++ b/dom/webidl/StreamFilter.webidl
@@ -0,0 +1,144 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * This is a Mozilla-specific WebExtension API, which is not available to web
+ * content. It allows monitoring and filtering of HTTP response stream data.
+ *
+ * This API should currently be considered experimental, and is not defined by
+ * any standard.
+ */
+
+enum StreamFilterStatus {
+  /**
+   * The StreamFilter is not fully initialized. No methods may be called until
+   * a "start" event has been received.
+   */
+  "uninitialized",
+  /**
+   * The underlying channel is currently transferring data, which will be
+   * dispatched via "data" events.
+   */
+  "transferringdata",
+  /**
+   * The underlying channel has finished transferring data. Data may still be
+   * written via write() calls at this point.
+   */
+  "finishedtransferringdata",
+  /**
+   * Data transfer is currently suspended. It may be resumed by a call to
+   * resume(). Data may still be written via write() calls in this state.
+   */
+  "suspended",
+  /**
+   * The channel has been closed by a call to close(). No further data wlil be
+   * delivered via "data" events, and no further data may be written via
+   * write() calls.
+   */
+  "closed",
+  /**
+   * The channel has been disconnected by a call to disconnect(). All further
+   * data will be delivered directly, without passing through the filter. No
+   * further events will be dispatched, and no further data may be written by
+   * write() calls.
+   */
+  "disconnected",
+  /**
+   * An error has occurred and the channel is disconnected. The `error`
+   * property contains the details of the error.
+   */
+  "failed",
+};
+
+/**
+ * An interface which allows an extension to intercept, and optionally modify,
+ * response data from an HTTP request.
+ */
+[Exposed=Window,
+ Func="mozilla::extensions::StreamFilter::IsAllowedInContext"]
+interface StreamFilter : EventTarget {
+  /**
+   * Creates a stream filter for the given add-on and the given extension ID.
+   */
+  [ChromeOnly]
+  static StreamFilter create(unsigned long long requestId, DOMString addonId);
+
+  /**
+   * Suspends processing of the request. After this is called, no further data
+   * will be delivered until the request is resumed.
+   */
+  [Throws]
+  undefined suspend();
+
+  /**
+   * Resumes delivery of data for a suspended request.
+   */
+  [Throws]
+  undefined resume();
+
+  /**
+   * Closes the request. After this is called, no more data may be written to
+   * the stream, and no further data will be delivered.
+   *
+   * This *must* be called after the consumer is finished writing data, unless
+   * disconnect() has already been called.
+   */
+  [Throws]
+  undefined close();
+
+  /**
+   * Disconnects the stream filter from the request. After this is called, no
+   * further data will be delivered to the filter, and any unprocessed data
+   * will be written directly to the output stream.
+   */
+  [Throws]
+  undefined disconnect();
+
+  /**
+   * Writes a chunk of data to the output stream. This may not be called
+   * before the "start" event has been received.
+   */
+  [Throws]
+  undefined write((ArrayBuffer or Uint8Array) data);
+
+  /**
+   * Returns the current status of the stream.
+   */
+  [Pure]
+  readonly attribute StreamFilterStatus status;
+
+  /**
+   * After an "error" event has been dispatched, this contains a message
+   * describing the error.
+   */
+  [Pure]
+  readonly attribute DOMString error;
+
+  /**
+   * Dispatched with a StreamFilterDataEvent whenever incoming data is
+   * available on the stream. This data will not be delivered to the output
+   * stream unless it is explicitly written via a write() call.
+   */
+  attribute EventHandler ondata;
+
+  /**
+   * Dispatched when the stream is opened, and is about to begin delivering
+   * data.
+   */
+  attribute EventHandler onstart;
+
+  /**
+   * Dispatched when the stream has closed, and has no more data to deliver.
+   * The output stream remains open and writable until close() is called.
+   */
+  attribute EventHandler onstop;
+
+  /**
+   * Dispatched when an error has occurred. No further data may be read or
+   * written after this point.
+   */
+  attribute EventHandler onerror;
+};
diff --git a/dom/webidl/StreamFilterDataEvent.webidl b/dom/webidl/StreamFilterDataEvent.webidl
new file mode 100644
index 0000000000..63ee1bcdbe
--- /dev/null
+++ b/dom/webidl/StreamFilterDataEvent.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * This is a Mozilla-specific WebExtension API, which is not available to web
+ * content. It allows monitoring and filtering of HTTP response stream data.
+ *
+ * This API should currently be considered experimental, and is not defined by
+ * any standard.
+ */
+
+[Func="mozilla::extensions::StreamFilter::IsAllowedInContext",
+ Exposed=Window]
+interface StreamFilterDataEvent : Event {
+  constructor(DOMString type,
+              optional StreamFilterDataEventInit eventInitDict = {});
+
+  /**
+   * Contains a chunk of data read from the input stream.
+   */
+  [Pure]
+  readonly attribute ArrayBuffer data;
+};
+
+dictionary StreamFilterDataEventInit : EventInit {
+  required ArrayBuffer data;
+};
diff --git a/dom/webidl/StructuredCloneTester.webidl b/dom/webidl/StructuredCloneTester.webidl
new file mode 100644
index 0000000000..4892bd49ae
--- /dev/null
+++ b/dom/webidl/StructuredCloneTester.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=(Window,Worker),
+ Pref="dom.testing.structuredclonetester.enabled",
+ Serializable]
+interface StructuredCloneTester {
+  constructor(boolean serializable, boolean deserializable);
+
+  readonly attribute boolean serializable;
+  readonly attribute boolean deserializable;
+};
diff --git a/dom/webidl/StyleSheet.webidl b/dom/webidl/StyleSheet.webidl
new file mode 100644
index 0000000000..1efa74010b
--- /dev/null
+++ b/dom/webidl/StyleSheet.webidl
@@ -0,0 +1,53 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom/
+ */
+
+[Exposed=Window]
+interface StyleSheet {
+  [Constant]
+  readonly attribute DOMString type;
+  [Constant, Throws]
+  readonly attribute DOMString? href;
+  // Spec says "Node", but it can go null when the node gets a new
+  // sheet.  That's also why it's not [Constant]
+  [Pure]
+  readonly attribute Node? ownerNode;
+  [Pure]
+  readonly attribute StyleSheet? parentStyleSheet;
+  [Pure]
+  readonly attribute DOMString? title;
+  [Constant, PutForwards=mediaText]
+  readonly attribute MediaList media;
+  [Pure]
+  attribute boolean disabled;
+  // The source map URL for this style sheet.  The source map URL can
+  // be found in one of two ways.
+  //
+  // If a SourceMap or X-SourceMap response header is seen, this is
+  // the value.  If both are seen, SourceMap is preferred.  Because
+  // this relies on the HTTP response, it can change if checked before
+  // the response is available -- which is why it is not [Constant].
+  //
+  // If the style sheet has the special "# sourceMappingURL=" comment,
+  // then this is the URL specified there.
+  //
+  // If the source map URL is not found by either of these methods,
+  // then this is an empty string.
+  [ChromeOnly, Pure]
+  readonly attribute DOMString sourceMapURL;
+  // The source URL for this style sheet.  If the style sheet has the
+  // special "# sourceURL=" comment, then this is the URL specified
+  // there.  If no such comment is found, then this is the empty
+  // string.
+  [ChromeOnly, Pure]
+  readonly attribute DOMString sourceURL;
+  [ChromeOnly, Pure]
+  readonly attribute Document? associatedDocument;
+  [ChromeOnly, Pure, BinaryName="isConstructed"]
+  readonly attribute boolean constructed;
+};
diff --git a/dom/webidl/StyleSheetApplicableStateChangeEvent.webidl b/dom/webidl/StyleSheetApplicableStateChangeEvent.webidl
new file mode 100644
index 0000000000..82714bad00
--- /dev/null
+++ b/dom/webidl/StyleSheetApplicableStateChangeEvent.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly,
+ Exposed=Window]
+interface StyleSheetApplicableStateChangeEvent : Event
+{
+  constructor(DOMString type,
+              optional StyleSheetApplicableStateChangeEventInit eventInitDict = {});
+
+  readonly attribute CSSStyleSheet? stylesheet;
+  readonly attribute boolean applicable;
+};
+
+dictionary StyleSheetApplicableStateChangeEventInit : EventInit
+{
+  CSSStyleSheet? stylesheet = null;
+  boolean applicable = false;
+};
diff --git a/dom/webidl/StyleSheetList.webidl b/dom/webidl/StyleSheetList.webidl
new file mode 100644
index 0000000000..98eb5cee98
--- /dev/null
+++ b/dom/webidl/StyleSheetList.webidl
@@ -0,0 +1,10 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// https://drafts.csswg.org/cssom/#stylesheetlist
+[Exposed=Window]
+interface StyleSheetList {
+  getter CSSStyleSheet? item(unsigned long index);
+  readonly attribute unsigned long length;
+};
diff --git a/dom/webidl/SubmitEvent.webidl b/dom/webidl/SubmitEvent.webidl
new file mode 100644
index 0000000000..43507fe675
--- /dev/null
+++ b/dom/webidl/SubmitEvent.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#submitevent
+ */
+
+[Exposed=Window]
+interface SubmitEvent : Event {
+  constructor(DOMString type, optional SubmitEventInit eventInitDict = {});
+
+  readonly attribute HTMLElement? submitter;
+};
+
+dictionary SubmitEventInit : EventInit {
+  HTMLElement? submitter = null;
+};
diff --git a/dom/webidl/SubtleCrypto.webidl b/dom/webidl/SubtleCrypto.webidl
new file mode 100644
index 0000000000..6c7842b1f2
--- /dev/null
+++ b/dom/webidl/SubtleCrypto.webidl
@@ -0,0 +1,245 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/WebCryptoAPI/
+ */
+
+typedef DOMString KeyType;
+typedef DOMString KeyUsage;
+typedef DOMString NamedCurve;
+typedef Uint8Array BigInteger;
+
+/***** Algorithm dictionaries *****/
+
+dictionary Algorithm {
+  required DOMString name;
+};
+
+[GenerateInit]
+dictionary AesCbcParams : Algorithm {
+  required BufferSource iv;
+};
+
+[GenerateInit]
+dictionary AesCtrParams : Algorithm {
+  required BufferSource counter;
+  required [EnforceRange] octet length;
+};
+
+[GenerateInit]
+dictionary AesGcmParams : Algorithm {
+  required BufferSource iv;
+  BufferSource additionalData;
+  [EnforceRange] octet tagLength;
+};
+
+dictionary HmacImportParams : Algorithm {
+  required AlgorithmIdentifier hash;
+};
+
+[GenerateInit]
+dictionary Pbkdf2Params : Algorithm {
+  required BufferSource salt;
+  required [EnforceRange] unsigned long iterations;
+  required AlgorithmIdentifier hash;
+};
+
+[GenerateInit]
+dictionary RsaHashedImportParams {
+  required AlgorithmIdentifier hash;
+};
+
+dictionary AesKeyGenParams : Algorithm {
+  required [EnforceRange] unsigned short length;
+};
+
+[GenerateInit]
+dictionary HmacKeyGenParams : Algorithm {
+  required AlgorithmIdentifier hash;
+  [EnforceRange] unsigned long length;
+};
+
+[GenerateInit]
+dictionary RsaHashedKeyGenParams : Algorithm {
+  required [EnforceRange] unsigned long modulusLength;
+  required BigInteger publicExponent;
+  required AlgorithmIdentifier hash;
+};
+
+[GenerateInit]
+dictionary RsaOaepParams : Algorithm {
+  BufferSource label;
+};
+
+[GenerateInit]
+dictionary RsaPssParams : Algorithm {
+  required [EnforceRange] unsigned long saltLength;
+};
+
+[GenerateInit]
+dictionary EcKeyGenParams : Algorithm {
+  required NamedCurve namedCurve;
+};
+
+[GenerateInit]
+dictionary AesDerivedKeyParams : Algorithm {
+  required [EnforceRange] unsigned long length;
+};
+
+[GenerateInit]
+dictionary HmacDerivedKeyParams : HmacImportParams {
+  [EnforceRange] unsigned long length;
+};
+
+[GenerateInit]
+dictionary EcdhKeyDeriveParams : Algorithm {
+  required CryptoKey public;
+};
+
+[GenerateInit]
+dictionary DhImportKeyParams : Algorithm {
+  required BigInteger prime;
+  required BigInteger generator;
+};
+
+[GenerateInit]
+dictionary EcdsaParams : Algorithm {
+  required AlgorithmIdentifier hash;
+};
+
+[GenerateInit]
+dictionary EcKeyImportParams : Algorithm {
+  NamedCurve namedCurve;
+};
+
+[GenerateInit]
+dictionary HkdfParams : Algorithm {
+  required AlgorithmIdentifier hash;
+  required BufferSource salt;
+  required BufferSource info;
+};
+
+/***** JWK *****/
+
+dictionary RsaOtherPrimesInfo {
+  // The following fields are defined in Section 6.3.2.7 of JSON Web Algorithms
+  required DOMString r;
+  required DOMString d;
+  required DOMString t;
+};
+
+[GenerateInitFromJSON, GenerateToJSON]
+dictionary JsonWebKey {
+  // The following fields are defined in Section 3.1 of JSON Web Key
+  required DOMString kty;
+  DOMString use;
+  sequence<DOMString> key_ops;
+  DOMString alg;
+
+  // The following fields are defined in JSON Web Key Parameters Registration
+  boolean ext;
+
+  // The following fields are defined in Section 6 of JSON Web Algorithms
+  DOMString crv;
+  DOMString x;
+  DOMString y;
+  DOMString d;
+  DOMString n;
+  DOMString e;
+  DOMString p;
+  DOMString q;
+  DOMString dp;
+  DOMString dq;
+  DOMString qi;
+  sequence<RsaOtherPrimesInfo> oth;
+  DOMString k;
+};
+
+
+/***** The Main API *****/
+
+[Serializable,
+ SecureContext,
+ Exposed=(Window,Worker)]
+interface CryptoKey {
+  readonly attribute KeyType type;
+  readonly attribute boolean extractable;
+  [Cached, Constant, Throws] readonly attribute object algorithm;
+  [Cached, Constant, Frozen] readonly attribute sequence<KeyUsage> usages;
+};
+
+[GenerateConversionToJS]
+dictionary CryptoKeyPair {
+  required CryptoKey publicKey;
+  required CryptoKey privateKey;
+};
+
+typedef DOMString KeyFormat;
+typedef (object or DOMString) AlgorithmIdentifier;
+
+[Exposed=(Window,Worker),
+ SecureContext]
+interface SubtleCrypto {
+  [NewObject]
+  Promise<any> encrypt(AlgorithmIdentifier algorithm,
+                       CryptoKey key,
+                       BufferSource data);
+  [NewObject]
+  Promise<any> decrypt(AlgorithmIdentifier algorithm,
+                       CryptoKey key,
+                       BufferSource data);
+  [NewObject]
+  Promise<any> sign(AlgorithmIdentifier algorithm,
+                     CryptoKey key,
+                     BufferSource data);
+  [NewObject]
+  Promise<any> verify(AlgorithmIdentifier algorithm,
+                      CryptoKey key,
+                      BufferSource signature,
+                      BufferSource data);
+  [NewObject]
+  Promise<any> digest(AlgorithmIdentifier algorithm,
+                      BufferSource data);
+
+  [NewObject]
+  Promise<any> generateKey(AlgorithmIdentifier algorithm,
+                           boolean extractable,
+                           sequence<KeyUsage> keyUsages );
+  [NewObject]
+  Promise<any> deriveKey(AlgorithmIdentifier algorithm,
+                         CryptoKey baseKey,
+                         AlgorithmIdentifier derivedKeyType,
+                         boolean extractable,
+                         sequence<KeyUsage> keyUsages );
+  [NewObject]
+  Promise<any> deriveBits(AlgorithmIdentifier algorithm,
+                          CryptoKey baseKey,
+                          unsigned long length);
+
+  [NewObject]
+  Promise<any> importKey(KeyFormat format,
+                         object keyData,
+                         AlgorithmIdentifier algorithm,
+                         boolean extractable,
+                         sequence<KeyUsage> keyUsages );
+  [NewObject]
+  Promise<any> exportKey(KeyFormat format, CryptoKey key);
+
+  [NewObject]
+  Promise<any> wrapKey(KeyFormat format,
+                       CryptoKey key,
+                       CryptoKey wrappingKey,
+                       AlgorithmIdentifier wrapAlgorithm);
+
+  [NewObject]
+  Promise<any> unwrapKey(KeyFormat format,
+                         BufferSource wrappedKey,
+                         CryptoKey unwrappingKey,
+                         AlgorithmIdentifier unwrapAlgorithm,
+                         AlgorithmIdentifier unwrappedKeyAlgorithm,
+                         boolean extractable,
+                         sequence<KeyUsage> keyUsages );
+};
diff --git a/dom/webidl/TCPServerSocket.webidl b/dom/webidl/TCPServerSocket.webidl
new file mode 100644
index 0000000000..259bd3f6b4
--- /dev/null
+++ b/dom/webidl/TCPServerSocket.webidl
@@ -0,0 +1,45 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * TCPServerSocket
+ *
+ * An interface to a server socket that can accept incoming connections for gaia apps.
+ */
+
+dictionary ServerSocketOptions {
+  TCPSocketBinaryType binaryType = "string";
+};
+
+[Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
+ Exposed=Window]
+interface TCPServerSocket : EventTarget {
+  [Throws]
+  constructor(unsigned short port, optional ServerSocketOptions options = {},
+              optional unsigned short backlog = 0);
+
+   /**
+   * The port of this server socket object.
+   */
+  readonly attribute unsigned short localPort;
+
+  /**
+   * The "connect" event is dispatched when a client connection is accepted.
+   * The event object will be a TCPServerSocketEvent containing a TCPSocket
+   * instance, which is used for communication between client and server.
+   */
+  attribute EventHandler onconnect;
+
+  /**
+   * The "error" event will be dispatched when a listening server socket is
+   * unexpectedly disconnected.
+   */
+  attribute EventHandler onerror;
+
+  /**
+   * Close the server socket.
+   */
+  undefined close();
+};
diff --git a/dom/webidl/TCPServerSocketEvent.webidl b/dom/webidl/TCPServerSocketEvent.webidl
new file mode 100644
index 0000000000..23f502deb8
--- /dev/null
+++ b/dom/webidl/TCPServerSocketEvent.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
+ Exposed=Window]
+interface TCPServerSocketEvent : Event {
+  constructor(DOMString type,
+              optional TCPServerSocketEventInit eventInitDict = {});
+
+  readonly attribute TCPSocket socket;
+};
+
+dictionary TCPServerSocketEventInit : EventInit {
+  TCPSocket? socket = null;
+};
diff --git a/dom/webidl/TCPSocket.webidl b/dom/webidl/TCPSocket.webidl
new file mode 100644
index 0000000000..cf5ab4fdd5
--- /dev/null
+++ b/dom/webidl/TCPSocket.webidl
@@ -0,0 +1,221 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * TCPSocket exposes a TCP client socket (no server sockets yet)
+ * to highly privileged apps. It provides a buffered, non-blocking
+ * interface for sending. For receiving, it uses an asynchronous,
+ * event handler based interface.
+ */
+
+interface nsISocketTransport;
+
+enum TCPSocketBinaryType {
+  "arraybuffer",
+  "string"
+};
+
+dictionary SocketOptions {
+  boolean useSecureTransport = false;
+  TCPSocketBinaryType binaryType = "string";
+};
+
+enum TCPReadyState {
+  "connecting",
+  "open",
+  "closing",
+  "closed",
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=Window]
+interface LegacyMozTCPSocket {
+  /**
+   * Legacy constructor for API compatibility.
+   */
+  [Throws]
+  TCPSocket open(DOMString host, unsigned short port, optional SocketOptions options = {});
+
+  [Throws]
+  TCPServerSocket listen(unsigned short port, optional ServerSocketOptions options = {}, optional unsigned short backlog = 0);
+};
+
+[Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
+ Exposed=Window]
+interface TCPSocket : EventTarget {
+  [Throws]
+  constructor(DOMString host, unsigned short port,
+              optional SocketOptions options = {});
+
+  /**
+   * Upgrade an insecure connection to use TLS. Throws if the ready state is not OPEN.
+   */
+  [Throws] undefined upgradeToSecure();
+
+  /**
+   * The raw internal socket transport.
+   */
+  readonly attribute nsISocketTransport? transport;
+
+  /**
+   * The UTF16 host of this socket object.
+   */
+  readonly attribute USVString host;
+
+  /**
+   * The port of this socket object.
+   */
+  readonly attribute unsigned short port;
+
+  /**
+   * True if this socket object is an SSL socket.
+   */
+  readonly attribute boolean ssl;
+
+  /**
+   * The number of bytes which have previously been buffered by calls to
+   * send on this socket.
+   */
+  readonly attribute unsigned long long bufferedAmount;
+
+  /**
+   * Pause reading incoming data and invocations of the ondata handler until
+   * resume is called. Can be called multiple times without resuming.
+   */
+  undefined suspend();
+
+  /**
+   * Resume reading incoming data and invoking ondata as usual. There must be
+   * an equal number of resume as suspends that took place. Throws if the
+   * socket is not suspended.
+   */
+  [Throws]
+  undefined resume();
+
+  /**
+   * Close the socket.
+   */
+  undefined close();
+
+  /**
+   * Close the socket immediately without waiting for unsent data.
+   */
+  [ChromeOnly] undefined closeImmediately();
+
+  /**
+   * Write data to the socket.
+   *
+   * @param data The data to write to the socket.
+   *
+   * @return Send returns true or false as a hint to the caller that
+   *         they may either continue sending more data immediately, or
+   *         may want to wait until the other side has read some of the
+   *         data which has already been written to the socket before
+   *         buffering more. If send returns true, then less than 64k
+   *         has been buffered and it's safe to immediately write more.
+   *         If send returns false, then more than 64k has been buffered,
+   *         and the caller may wish to wait until the ondrain event
+   *         handler has been called before buffering more data by more
+   *         calls to send.
+   *
+   * @throws Throws if the ready state is not OPEN.
+   */
+  [Throws]
+  boolean send(ByteString data);
+
+  /**
+   * Write data to the socket.
+   *
+   * @param data The data to write to the socket.
+   * @param byteOffset The offset within the data from which to begin writing.
+   * @param byteLength The number of bytes to write.
+   *                   Defaults to the byte length of the ArrayBuffer if not present,
+   *                   and clamped to (length - byteOffset).
+   *
+   * @return Send returns true or false as a hint to the caller that
+   *         they may either continue sending more data immediately, or
+   *         may want to wait until the other side has read some of the
+   *         data which has already been written to the socket before
+   *         buffering more. If send returns true, then less than 64k
+   *         has been buffered and it's safe to immediately write more.
+   *         If send returns false, then more than 64k has been buffered,
+   *         and the caller may wish to wait until the ondrain event
+   *         handler has been called before buffering more data by more
+   *         calls to send.
+   *
+   * @throws Throws if the ready state is not OPEN.
+   */
+  [Throws]
+  boolean send(ArrayBuffer data, optional unsigned long byteOffset = 0, optional unsigned long byteLength);
+
+  /**
+   * The readyState attribute indicates which state the socket is currently
+   * in.
+   */
+  readonly attribute TCPReadyState readyState;
+
+  /**
+   * The binaryType attribute indicates which mode this socket uses for
+   * sending and receiving data. If the binaryType: "arraybuffer" option
+   * was passed to the open method that created this socket, binaryType
+   * will be "arraybuffer". Otherwise, it will be "string".
+   */
+  readonly attribute TCPSocketBinaryType binaryType;
+
+  /**
+   * The "open" event is dispatched when the connection to the server
+   * has been established. If the connection is refused, the "error" event
+   * will be dispatched, instead.
+   */
+  attribute EventHandler onopen;
+
+  /**
+   * After send has buffered more than 64k of data, it returns false to
+   * indicate that the client should pause before sending more data, to
+   * avoid accumulating large buffers. This is only advisory, and the client
+   * is free to ignore it and buffer as much data as desired, but if reducing
+   * the size of buffers is important (especially for a streaming application)
+   * the "drain" event will be dispatched once the previously-buffered data has
+   * been written to the network, at which point the client can resume calling
+   * send again.
+   */
+  attribute EventHandler ondrain;
+
+  /**
+   * The "data" event will be dispatched repeatedly and asynchronously after
+   * "open" is dispatched, every time some data was available from the server
+   * and was read. The event object will be a TCPSocketEvent; if the "arraybuffer"
+   * binaryType was passed to the constructor, the data attribute of the event
+   * object will be an ArrayBuffer. If not, it will be a normal JavaScript string,
+   * truncated at the first null byte found in the payload and the remainder
+   * interpreted as ASCII bytes.
+   *
+   * At any time, the client may choose to pause reading and receiving "data"
+   * events by calling the socket's suspend() method. Further "data" events
+   * will be paused until resume() is called.
+   */
+  attribute EventHandler ondata;
+
+  /**
+   * The "error" event will be dispatched when there is an error. The event
+   * object will be a TCPSocketErrorEvent.
+   *
+   * If an "error" event is dispatched before an "open" one, the connection
+   * was refused, and the "close" event will not be dispatched. If an "error"
+   * event is dispatched after an "open" event, the connection was lost,
+   * and a "close" event will be dispatched subsequently.
+   */
+  attribute EventHandler onerror;
+
+  /**
+   * The "close" event is dispatched once the underlying network socket
+   * has been closed, either by the server, or by the client calling
+   * close.
+   *
+   * If the "error" event was not dispatched before "close", then one of
+   * the sides cleanly closed the connection.
+   */
+  attribute EventHandler onclose;
+};
diff --git a/dom/webidl/TCPSocketErrorEvent.webidl b/dom/webidl/TCPSocketErrorEvent.webidl
new file mode 100644
index 0000000000..2a530c352e
--- /dev/null
+++ b/dom/webidl/TCPSocketErrorEvent.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Dispatched as part of the "error" event in the following situations:
+* - if there's an error detected when the TCPSocket closes
+* - if there's an internal error while sending data
+* - if there's an error connecting to the host
+*/
+
+[Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
+ Exposed=Window]
+interface TCPSocketErrorEvent : Event {
+  constructor(DOMString type,
+              optional TCPSocketErrorEventInit eventInitDict = {});
+
+  readonly attribute DOMString name;
+  readonly attribute DOMString message;
+  readonly attribute unsigned long errorCode; // The internal nsresult error code.
+};
+
+dictionary TCPSocketErrorEventInit : EventInit
+{
+  DOMString name = "";
+  DOMString message = "";
+  unsigned long errorCode = 0;
+};
diff --git a/dom/webidl/TCPSocketEvent.webidl b/dom/webidl/TCPSocketEvent.webidl
new file mode 100644
index 0000000000..408a3938ad
--- /dev/null
+++ b/dom/webidl/TCPSocketEvent.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * TCPSocketEvent is the event dispatched for all of the events described by TCPSocket,
+ * except the "error" event. It contains the socket that was associated with the event,
+ * the type of event, and the data associated with the event if the event is a "data" event.
+ */
+
+[Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
+ Exposed=Window]
+interface TCPSocketEvent : Event {
+  constructor(DOMString type, optional TCPSocketEventInit eventInitDict = {});
+
+  /**
+   * If the event is a "data" event, data will be the bytes read from the network;
+   * if the binaryType of the socket was "arraybuffer", this value will be of type
+   * ArrayBuffer, otherwise, it will be a ByteString.
+   *
+   * For other events, data will be an empty string.
+   */
+  //TODO: make this (ArrayBuffer or ByteString) after sorting out the rooting required. (bug 1121634)
+  readonly attribute any data;
+};
+
+dictionary TCPSocketEventInit : EventInit {
+  //TODO: make this (ArrayBuffer or ByteString) after sorting out the rooting required. (bug 1121634)
+  any data = null;
+};
diff --git a/dom/webidl/TaskPriorityChangeEvent.webidl b/dom/webidl/TaskPriorityChangeEvent.webidl
new file mode 100644
index 0000000000..1fc959ecb6
--- /dev/null
+++ b/dom/webidl/TaskPriorityChangeEvent.webidl
@@ -0,0 +1,9 @@
+[Exposed=(Window, Worker), Pref="dom.enable_web_task_scheduling"]
+interface TaskPriorityChangeEvent : Event {
+  constructor (DOMString type , TaskPriorityChangeEventInit priorityChangeEventInitDict);
+  readonly attribute TaskPriority previousPriority;
+};
+
+dictionary TaskPriorityChangeEventInit : EventInit {
+  required TaskPriority previousPriority;
+};
diff --git a/dom/webidl/TestFunctions.webidl b/dom/webidl/TestFunctions.webidl
new file mode 100644
index 0000000000..fcc52016a1
--- /dev/null
+++ b/dom/webidl/TestFunctions.webidl
@@ -0,0 +1,154 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+// A dumping ground for random testing functions
+
+callback PromiseReturner = Promise<any>();
+callback PromiseReturner2 = Promise<any>(any arg, DOMString arg2);
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface WrapperCachedNonISupportsTestInterface {
+  [Pref="dom.webidl.test1"] constructor();
+};
+
+[Trial="TestTrial", Exposed=*]
+interface TestTrialInterface {
+  constructor();
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceLength {
+  [ChromeOnly]
+  constructor(boolean arg);
+};
+
+// The type of string C++ sees.
+enum StringType {
+  "literal",      // A string with the LITERAL flag.
+  "stringbuffer", // A string with the REFCOUNTED flag.
+  "inline",       // A string with the INLINE flag.
+  "other",        // Anything else.
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestFunctions {
+  constructor();
+
+  [Throws]
+  static undefined throwUncatchableException();
+
+  // Simply returns its argument.  Can be used to test Promise
+  // argument processing behavior.
+  static Promise<any> passThroughPromise(Promise<any> arg);
+
+  // Returns whatever Promise the given PromiseReturner returned.
+  [Throws]
+  static Promise<any> passThroughCallbackPromise(PromiseReturner callback);
+
+  // Some basic tests for string binding round-tripping behavior.
+  undefined setStringData(DOMString arg);
+
+  // Get the string data, using an nsAString argument on the C++ side.
+  // This will just use Assign/operator=, whatever that does.
+  DOMString getStringDataAsAString();
+
+  // Get the string data, but only "length" chars of it, using an
+  // nsAString argument on the C++ side.  This will always copy on the
+  // C++ side.
+  DOMString getStringDataAsAString(unsigned long length);
+
+  // Get the string data, but only "length" chars of it, using a
+  // DOMString argument on the C++ side and trying to hand it
+  // stringbuffers.  If length not passed, use our full length.
+  DOMString getStringDataAsDOMString(optional unsigned long length);
+
+  // Get a short (short enough to fit in a JS inline string) literal string.
+  DOMString getShortLiteralString();
+
+  // Get a medium (long enough to not be a JS inline, but short enough
+  // to fit in a FakeString inline buffer) literal string.
+  DOMString getMediumLiteralString();
+
+  // Get a long (long enough to not fit in any inline buffers) literal string.
+  DOMString getLongLiteralString();
+
+  // Get a stringbuffer string for whatever string is passed in.
+  DOMString getStringbufferString(DOMString input);
+
+  // Get the type of string that the C++ sees after going through bindings.
+  StringType getStringType(DOMString str);
+
+  // Returns true if both the incoming string and the stored (via setStringData())
+  // string have stringbuffers and they're the same stringbuffer.
+  boolean stringbufferMatchesStored(DOMString str);
+
+  // Functions that just punch through to mozITestInterfaceJS.idl
+  [Throws]
+  undefined testThrowNsresult();
+  [Throws]
+  undefined testThrowNsresultFromNative();
+
+  // Throws an InvalidStateError to auto-create a rejected promise.
+  [Throws]
+  static Promise<any> throwToRejectPromise();
+
+  // Some attributes for the toJSON to work with.
+  readonly attribute long one;
+  [Func="mozilla::dom::TestFunctions::ObjectFromAboutBlank"]
+  readonly attribute long two;
+
+  // Testing for how default toJSON behaves.
+  [Default] object toJSON();
+
+  // This returns a wrappercached non-ISupports object. While this will always
+  // return the same object, no optimization attributes like [Pure] should be
+  // used here because the object should not be held alive from JS by the
+  // bindings. This is needed to test wrapper preservation for weak map keys.
+  // See bug 1351501.
+  readonly attribute WrapperCachedNonISupportsTestInterface wrapperCachedNonISupportsObject;
+
+  attribute [Clamp] octet? clampedNullableOctet;
+  attribute [EnforceRange] octet? enforcedNullableOctet;
+
+  // Testing for [AllowShared]
+  [GetterThrows]
+  attribute ArrayBufferView arrayBufferView;
+  [GetterThrows]
+  attribute [AllowShared] ArrayBufferView allowSharedArrayBufferView;
+  [Cached, Pure, GetterThrows]
+  attribute sequence<ArrayBufferView> sequenceOfArrayBufferView;
+  [Cached, Pure, GetterThrows]
+  attribute sequence<[AllowShared] ArrayBufferView> sequenceOfAllowSharedArrayBufferView;
+  [GetterThrows]
+  attribute ArrayBuffer arrayBuffer;
+  [GetterThrows]
+  attribute [AllowShared] ArrayBuffer allowSharedArrayBuffer;
+  [Cached, Pure, GetterThrows]
+  attribute sequence<ArrayBuffer> sequenceOfArrayBuffer;
+  [Cached, Pure, GetterThrows]
+  attribute sequence<[AllowShared] ArrayBuffer> sequenceOfAllowSharedArrayBuffer;
+  undefined testNotAllowShared(ArrayBufferView buffer);
+  undefined testNotAllowShared(ArrayBuffer buffer);
+  undefined testNotAllowShared(DOMString buffer);
+  undefined testAllowShared([AllowShared] ArrayBufferView buffer);
+  undefined testAllowShared([AllowShared] ArrayBuffer buffer);
+  undefined testDictWithAllowShared(optional DictWithAllowSharedBufferSource buffer = {});
+  undefined testUnionOfBuffferSource((ArrayBuffer or ArrayBufferView or DOMString) foo);
+  undefined testUnionOfAllowSharedBuffferSource(([AllowShared] ArrayBuffer or [AllowShared] ArrayBufferView) foo);
+
+  boolean staticAndNonStaticOverload();
+  static boolean staticAndNonStaticOverload(optional unsigned long foo);
+};
+
+dictionary DictWithAllowSharedBufferSource {
+  ArrayBuffer arrayBuffer;
+  ArrayBufferView arrayBufferView;
+  [AllowShared] ArrayBuffer allowSharedArrayBuffer;
+  [AllowShared] ArrayBufferView allowSharedArrayBufferView;
+};
diff --git a/dom/webidl/TestInterfaceJS.webidl b/dom/webidl/TestInterfaceJS.webidl
new file mode 100644
index 0000000000..9b7eaee95d
--- /dev/null
+++ b/dom/webidl/TestInterfaceJS.webidl
@@ -0,0 +1,84 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary TestInterfaceJSUnionableDictionary {
+  object objectMember;
+  any anyMember;
+};
+
+[JSImplementation="@mozilla.org/dom/test-interface-js;1",
+ Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceJS : EventTarget {
+  [Throws]
+  constructor(optional any anyArg, optional object objectArg,
+              optional TestInterfaceJSDictionary dictionaryArg = {});
+
+  readonly attribute any anyArg;
+  readonly attribute object objectArg;
+  TestInterfaceJSDictionary getDictionaryArg();
+  attribute any anyAttr;
+  attribute object objectAttr;
+  TestInterfaceJSDictionary getDictionaryAttr();
+  undefined setDictionaryAttr(optional TestInterfaceJSDictionary dict = {});
+  any pingPongAny(any arg);
+  object pingPongObject(object obj);
+  any pingPongObjectOrString((object or DOMString) objOrString);
+  TestInterfaceJSDictionary pingPongDictionary(optional TestInterfaceJSDictionary dict = {});
+  long pingPongDictionaryOrLong(optional (TestInterfaceJSUnionableDictionary or long) dictOrLong = {});
+  DOMString pingPongRecord(record<DOMString, any> rec);
+  long objectSequenceLength(sequence<object> seq);
+  long anySequenceLength(sequence<any> seq);
+
+  // For testing bug 968335.
+  DOMString getCallerPrincipal();
+
+  DOMString convertSVS(USVString svs);
+
+  (TestInterfaceJS or long) pingPongUnion((TestInterfaceJS or long) something);
+  (DOMString or TestInterfaceJS?) pingPongUnionContainingNull((TestInterfaceJS? or DOMString) something);
+  (TestInterfaceJS or long)? pingPongNullableUnion((TestInterfaceJS or long)? something);
+  (Location or TestInterfaceJS) returnBadUnion();
+
+  // Test for sequence overloading and union behavior
+  undefined testSequenceOverload(sequence<DOMString> arg);
+  undefined testSequenceOverload(DOMString arg);
+
+  undefined testSequenceUnion((sequence<DOMString> or DOMString) arg);
+
+  // Tests for exception-throwing behavior
+  [Throws]
+  undefined testThrowError();
+
+  [Throws]
+  undefined testThrowDOMException();
+
+  [Throws]
+  undefined testThrowTypeError();
+
+  [Throws]
+  undefined testThrowCallbackError(Function callback);
+
+  [Throws]
+  undefined testThrowXraySelfHosted();
+
+  [Throws]
+  undefined testThrowSelfHosted();
+
+  // Tests for promise-rejection behavior
+  Promise<undefined> testPromiseWithThrowingChromePromiseInit();
+  Promise<undefined> testPromiseWithThrowingContentPromiseInit(Function func);
+  Promise<undefined> testPromiseWithDOMExceptionThrowingPromiseInit();
+  Promise<undefined> testPromiseWithThrowingChromeThenFunction();
+  Promise<undefined> testPromiseWithThrowingContentThenFunction(AnyCallback func);
+  Promise<undefined> testPromiseWithDOMExceptionThrowingThenFunction();
+  Promise<undefined> testPromiseWithThrowingChromeThenable();
+  Promise<undefined> testPromiseWithThrowingContentThenable(object thenable);
+  Promise<undefined> testPromiseWithDOMExceptionThrowingThenable();
+
+  // Event handler tests
+  attribute EventHandler onsomething;
+};
diff --git a/dom/webidl/TestInterfaceJSDictionaries.webidl b/dom/webidl/TestInterfaceJSDictionaries.webidl
new file mode 100644
index 0000000000..24bddcf4b7
--- /dev/null
+++ b/dom/webidl/TestInterfaceJSDictionaries.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+//
+// These dictionaries are in a separate WebIDL file to avoid circular include
+// problems. One of the dictionary includes a union as a member, so that
+// dictionary's header needs to include UnionTypes.h. But the API in
+// TestInterfaceJS also declares a union of dictionaries, so _that_
+// dictionary's header needs to be included _by_ UnionTypes.h. The solution
+// is to separate those two dictionaries into separate header files.
+//
+
+dictionary TestInterfaceJSDictionary2 {
+  object innerObject;
+};
+
+dictionary TestInterfaceJSDictionary {
+  TestInterfaceJSDictionary2 innerDictionary;
+  object objectMember;
+  any anyMember;
+  (object or DOMString) objectOrStringMember;
+  sequence<any> anySequenceMember;
+  record<DOMString, object> objectRecordMember;
+};
diff --git a/dom/webidl/TestInterfaceJSMaplikeSetlikeIterable.webidl b/dom/webidl/TestInterfaceJSMaplikeSetlikeIterable.webidl
new file mode 100644
index 0000000000..1b5c823ad5
--- /dev/null
+++ b/dom/webidl/TestInterfaceJSMaplikeSetlikeIterable.webidl
@@ -0,0 +1,152 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceMaplike {
+  [Throws]
+  constructor();
+
+  maplike<DOMString, long>;
+  undefined setInternal(DOMString aKey, long aValue);
+  undefined clearInternal();
+  boolean deleteInternal(DOMString aKey);
+  boolean hasInternal(DOMString aKey);
+  [Throws]
+  long getInternal(DOMString aKey);
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceMaplikeObject {
+  [Throws]
+  constructor();
+
+  readonly maplike<DOMString, TestInterfaceMaplike>;
+  undefined setInternal(DOMString aKey);
+  undefined clearInternal();
+  boolean deleteInternal(DOMString aKey);
+  boolean hasInternal(DOMString aKey);
+  [Throws]
+  TestInterfaceMaplike? getInternal(DOMString aKey);
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceMaplikeJSObject {
+  [Throws]
+  constructor();
+
+  readonly maplike<DOMString, object>;
+  undefined setInternal(DOMString aKey, object aObject);
+  undefined clearInternal();
+  boolean deleteInternal(DOMString aKey);
+  boolean hasInternal(DOMString aKey);
+  [Throws]
+  object? getInternal(DOMString aKey);
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceSetlike {
+  [Throws]
+  constructor();
+
+  setlike<DOMString>;
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceSetlikeNode {
+  [Throws]
+  constructor();
+
+  setlike<Node>;
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceIterableSingle {
+  [Throws]
+  constructor();
+
+  iterable<long>;
+  getter long(unsigned long index);
+  readonly attribute unsigned long length;
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceIterableDouble {
+  [Throws]
+  constructor();
+
+  iterable<DOMString, DOMString>;
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceIterableDoubleUnion {
+  [Throws]
+  constructor();
+
+  iterable<DOMString, (DOMString or long)>;
+};
+
+dictionary TestInterfaceAsyncIterableSingleOptions {
+  boolean failToInit = false;
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceAsyncIterableSingle {
+  [Throws]
+  constructor(optional TestInterfaceAsyncIterableSingleOptions options = {});
+
+  async iterable<long>;
+};
+
+callback TestThrowingCallback = undefined();
+
+dictionary TestInterfaceAsyncIteratorOptions {
+  unsigned long multiplier = 1;
+  sequence<Promise<any>> blockingPromises = [];
+  unsigned long failNextAfter = 4294967295;
+  boolean throwFromNext = false;
+  TestThrowingCallback throwFromReturn;
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceAsyncIterableSingleWithArgs {
+  [Throws]
+  constructor();
+
+  [GenerateReturnMethod]
+  async iterable<long>(optional TestInterfaceAsyncIteratorOptions options = {});
+
+  readonly attribute long returnCallCount;
+
+  readonly attribute any returnLastCalledWith;
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceAsyncIterableDouble {
+  [Throws]
+  constructor();
+
+  async iterable<DOMString, DOMString>;
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceAsyncIterableDoubleUnion {
+  [Throws]
+  constructor();
+
+  async iterable<DOMString, (DOMString or long)>;
+};
diff --git a/dom/webidl/TestInterfaceObservableArray.webidl b/dom/webidl/TestInterfaceObservableArray.webidl
new file mode 100644
index 0000000000..f608790ba5
--- /dev/null
+++ b/dom/webidl/TestInterfaceObservableArray.webidl
@@ -0,0 +1,66 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+callback SetDeleteObjectCallback = undefined (object value, unsigned long index);
+callback SetDeleteBooleanCallback = undefined (boolean value, unsigned long index);
+callback SetDeleteInterfaceCallback = undefined (TestInterfaceObservableArray value, unsigned long index);
+
+dictionary ObservableArrayCallbacks {
+  SetDeleteObjectCallback setObjectCallback;
+  SetDeleteObjectCallback deleteObjectCallback;
+  SetDeleteBooleanCallback setBooleanCallback;
+  SetDeleteBooleanCallback deleteBooleanCallback;
+  SetDeleteInterfaceCallback setInterfaceCallback;
+  SetDeleteInterfaceCallback deleteInterfaceCallback;
+};
+
+[Pref="dom.expose_test_interfaces",
+ Exposed=Window]
+interface TestInterfaceObservableArray {
+  [Throws]
+  constructor(optional ObservableArrayCallbacks callbacks = {});
+
+  // Testing for ObservableArray
+  attribute ObservableArray<boolean> observableArrayBoolean;
+  attribute ObservableArray<object> observableArrayObject;
+  attribute ObservableArray<TestInterfaceObservableArray> observableArrayInterface;
+
+  // Tests for C++ helper function
+  [Throws]
+  boolean booleanElementAtInternal(unsigned long index);
+  [Throws]
+  TestInterfaceObservableArray interfaceElementAtInternal(unsigned long index);
+  [Throws]
+  object objectElementAtInternal(unsigned long index);
+
+  [Throws]
+  undefined booleanReplaceElementAtInternal(unsigned long index, boolean value);
+  [Throws]
+  undefined interfaceReplaceElementAtInternal(unsigned long index, TestInterfaceObservableArray value);
+  [Throws]
+  undefined objectReplaceElementAtInternal(unsigned long index, object value);
+
+  [Throws]
+  undefined booleanAppendElementInternal(boolean value);
+  [Throws]
+  undefined interfaceAppendElementInternal(TestInterfaceObservableArray value);
+  [Throws]
+  undefined objectAppendElementInternal(object value);
+
+  [Throws]
+  undefined booleanRemoveLastElementInternal();
+  [Throws]
+  undefined interfaceRemoveLastElementInternal();
+  [Throws]
+  undefined objectRemoveLastElementInternal();
+
+  [Throws]
+  unsigned long booleanLengthInternal();
+  [Throws]
+  unsigned long interfaceLengthInternal();
+  [Throws]
+  unsigned long objectLengthInternal();
+};
diff --git a/dom/webidl/TestUtils.webidl b/dom/webidl/TestUtils.webidl
new file mode 100644
index 0000000000..8ba99edbc9
--- /dev/null
+++ b/dom/webidl/TestUtils.webidl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://testutils.spec.whatwg.org/#the-testutils-namespace
+ */
+
+[Exposed=(Window,Worker),
+ Pref="dom.testing.testutils.enabled"]
+namespace TestUtils {
+  [NewObject, Throws] Promise<undefined> gc();
+};
diff --git a/dom/webidl/Text.webidl b/dom/webidl/Text.webidl
new file mode 100644
index 0000000000..11ea0219e1
--- /dev/null
+++ b/dom/webidl/Text.webidl
@@ -0,0 +1,31 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window, ProbablyShortLivingWrapper]
+interface Text : CharacterData {
+  [Throws]
+  constructor(optional DOMString data = "");
+
+  [Throws]
+  Text splitText(unsigned long offset);
+  readonly attribute DOMString wholeText;
+};
+
+partial interface Text {
+  [BinaryName="assignedSlotByMode"]
+  readonly attribute HTMLSlotElement? assignedSlot;
+
+  [ChromeOnly, BinaryName="assignedSlot"]
+  readonly attribute HTMLSlotElement? openOrClosedAssignedSlot;
+};
+
+Text includes GeometryUtils;
diff --git a/dom/webidl/TextClause.webidl b/dom/webidl/TextClause.webidl
new file mode 100644
index 0000000000..9ed1c71843
--- /dev/null
+++ b/dom/webidl/TextClause.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly,
+ Exposed=Window]
+interface TextClause
+{
+  // The start offset of TextClause
+  readonly attribute long startOffset;
+
+  // The end offset of TextClause
+  readonly attribute long endOffset;
+
+  // If the TextClause is Caret or not
+  readonly attribute boolean isCaret;
+
+  // If the TextClause is TargetClause or not
+  readonly attribute boolean isTargetClause;
+};
diff --git a/dom/webidl/TextDecoder.webidl b/dom/webidl/TextDecoder.webidl
new file mode 100644
index 0000000000..fc01d7c8f7
--- /dev/null
+++ b/dom/webidl/TextDecoder.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://encoding.spec.whatwg.org/#interface-textdecoder
+ */
+
+interface mixin TextDecoderCommon {
+  [Constant]
+  readonly attribute DOMString encoding;
+  [Constant]
+  readonly attribute boolean fatal;
+  [Constant]
+  readonly attribute boolean ignoreBOM;
+};
+
+[Exposed=(Window,Worker)]
+interface TextDecoder {
+  [Throws]
+  constructor(optional DOMString label = "utf-8",
+              optional TextDecoderOptions options = {});
+
+  [Throws]
+  USVString decode(optional BufferSource input, optional TextDecodeOptions options = {});
+};
+TextDecoder includes TextDecoderCommon;
+
+dictionary TextDecoderOptions {
+  boolean fatal = false;
+  boolean ignoreBOM = false;
+};
+
+dictionary TextDecodeOptions {
+  boolean stream = false;
+};
diff --git a/dom/webidl/TextDecoderStream.webidl b/dom/webidl/TextDecoderStream.webidl
new file mode 100644
index 0000000000..a4ffca41cc
--- /dev/null
+++ b/dom/webidl/TextDecoderStream.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://encoding.spec.whatwg.org/#interface-textdecoderstream
+ */
+
+[Exposed=*]
+interface TextDecoderStream {
+  [Throws]
+  constructor(optional DOMString label = "utf-8", optional TextDecoderOptions options = {});
+};
+TextDecoderStream includes TextDecoderCommon;
+TextDecoderStream includes GenericTransformStream;
diff --git a/dom/webidl/TextEncoder.webidl b/dom/webidl/TextEncoder.webidl
new file mode 100644
index 0000000000..84a2998c91
--- /dev/null
+++ b/dom/webidl/TextEncoder.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://encoding.spec.whatwg.org/#interface-textencoder
+ */
+
+interface mixin TextEncoderCommon {
+  /*
+   * This is DOMString in the spec, but the value is always ASCII
+   * and short. By declaring this as ByteString, we get the same
+   * end result (storage as inline Latin1 string in SpiderMonkey)
+   * with fewer conversions.
+   */
+  [Constant]
+  readonly attribute ByteString encoding;
+};
+
+dictionary TextEncoderEncodeIntoResult {
+  unsigned long long read;
+  unsigned long long written;
+};
+
+[Exposed=(Window,Worker)]
+interface TextEncoder {
+  constructor();
+
+  /*
+   * This is spec-wise USVString but marking it as UTF8String as an
+   * optimization. (The SpiderMonkey-provided conversion to UTF-8 takes care of
+   * replacing lone surrogates with the REPLACEMENT CHARACTER, so the
+   * observable behavior of USVString is matched.)
+   */
+  [NewObject]
+  Uint8Array encode(optional UTF8String input = "");
+
+  /*
+   * The same comment about UTF8String as above applies here with JSString.
+   *
+   * We use JSString because we don't want to encode the full string, just as
+   * much as the capacity of the Uint8Array.
+   */
+  [CanOOM]
+  TextEncoderEncodeIntoResult encodeInto(JSString source, Uint8Array destination);
+};
+TextEncoder includes TextEncoderCommon;
diff --git a/dom/webidl/TextEncoderStream.webidl b/dom/webidl/TextEncoderStream.webidl
new file mode 100644
index 0000000000..2d9b8ad22d
--- /dev/null
+++ b/dom/webidl/TextEncoderStream.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://encoding.spec.whatwg.org/#interface-textdecoderstream
+ */
+
+[Exposed=*]
+interface TextEncoderStream {
+  [Throws]
+  constructor();
+};
+TextEncoderStream includes TextEncoderCommon;
+TextEncoderStream includes GenericTransformStream;
diff --git a/dom/webidl/TextTrack.webidl b/dom/webidl/TextTrack.webidl
new file mode 100644
index 0000000000..f7a997067a
--- /dev/null
+++ b/dom/webidl/TextTrack.webidl
@@ -0,0 +1,49 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#texttrack
+ */
+
+enum TextTrackKind {
+  "subtitles",
+  "captions",
+  "descriptions",
+  "chapters",
+  "metadata"
+};
+
+enum TextTrackMode {
+  "disabled",
+  "hidden",
+  "showing"
+};
+
+[Exposed=Window]
+interface TextTrack : EventTarget {
+  readonly attribute TextTrackKind kind;
+  readonly attribute DOMString label;
+  readonly attribute DOMString language;
+
+  readonly attribute DOMString id;
+  readonly attribute DOMString inBandMetadataTrackDispatchType;
+
+           attribute TextTrackMode mode;
+
+  readonly attribute TextTrackCueList? cues;
+  readonly attribute TextTrackCueList? activeCues;
+
+  undefined addCue(VTTCue cue);
+  [Throws]
+  undefined removeCue(VTTCue cue);
+
+           attribute EventHandler oncuechange;
+};
+
+// Mozilla Extensions
+partial interface TextTrack {
+  [ChromeOnly]
+  readonly attribute TextTrackList? textTrackList;
+};
diff --git a/dom/webidl/TextTrackCue.webidl b/dom/webidl/TextTrackCue.webidl
new file mode 100644
index 0000000000..444d470bbd
--- /dev/null
+++ b/dom/webidl/TextTrackCue.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/#texttrackcue
+ */
+
+[Exposed=Window]
+interface TextTrackCue : EventTarget {
+  readonly attribute TextTrack? track;
+
+  attribute DOMString id;
+  attribute double startTime;
+  attribute double endTime;
+  attribute boolean pauseOnExit;
+
+  attribute EventHandler onenter;
+  attribute EventHandler onexit;
+};
diff --git a/dom/webidl/TextTrackCueList.webidl b/dom/webidl/TextTrackCueList.webidl
new file mode 100644
index 0000000000..b9f82c7549
--- /dev/null
+++ b/dom/webidl/TextTrackCueList.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#texttrackcuelist
+ */
+
+[Exposed=Window]
+interface TextTrackCueList {
+  readonly attribute unsigned long length;
+  getter VTTCue (unsigned long index);
+  VTTCue? getCueById(DOMString id);
+};
diff --git a/dom/webidl/TextTrackList.webidl b/dom/webidl/TextTrackList.webidl
new file mode 100644
index 0000000000..e46208d6cb
--- /dev/null
+++ b/dom/webidl/TextTrackList.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#texttracklist
+ */
+
+[Exposed=Window]
+interface TextTrackList : EventTarget {
+  readonly attribute unsigned long length;
+  getter TextTrack (unsigned long index);
+  TextTrack? getTrackById(DOMString id);
+
+           attribute EventHandler onchange;
+           attribute EventHandler onaddtrack;
+           attribute EventHandler onremovetrack;
+};
+
+// Mozilla extensions
+partial interface TextTrackList {
+  [ChromeOnly]
+  readonly attribute HTMLMediaElement? mediaElement;
+};
diff --git a/dom/webidl/TimeEvent.webidl b/dom/webidl/TimeEvent.webidl
new file mode 100644
index 0000000000..a1b19b537d
--- /dev/null
+++ b/dom/webidl/TimeEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface TimeEvent : Event
+{
+  readonly attribute long         detail;
+  readonly attribute WindowProxy? view;
+  undefined initTimeEvent(DOMString aType,
+                          optional Window? aView = null,
+                          optional long aDetail = 0);
+};
diff --git a/dom/webidl/TimeRanges.webidl b/dom/webidl/TimeRanges.webidl
new file mode 100644
index 0000000000..f09be7c168
--- /dev/null
+++ b/dom/webidl/TimeRanges.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#timeranges
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface TimeRanges {
+  readonly attribute unsigned long length;
+
+  [Throws]
+  double start(unsigned long index);
+
+  [Throws]
+  double end(unsigned long index);
+};
diff --git a/dom/webidl/ToggleEvent.webidl b/dom/webidl/ToggleEvent.webidl
new file mode 100644
index 0000000000..42204bdc3a
--- /dev/null
+++ b/dom/webidl/ToggleEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/popover.html#the-toggleevent-interface
+ */
+
+[Pref="dom.element.popover.enabled",
+ Exposed=Window]
+interface ToggleEvent : Event {
+    constructor(DOMString type, optional ToggleEventInit eventInitDict = {});
+    readonly attribute DOMString oldState;
+    readonly attribute DOMString newState;
+};
+
+dictionary ToggleEventInit : EventInit {
+    DOMString oldState = "";
+    DOMString newState = "";
+};
diff --git a/dom/webidl/Touch.webidl b/dom/webidl/Touch.webidl
new file mode 100644
index 0000000000..344295a0e8
--- /dev/null
+++ b/dom/webidl/Touch.webidl
@@ -0,0 +1,52 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/webevents/raw-file/default/touchevents.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary TouchInit {
+  required long identifier;
+  required EventTarget target;
+  long clientX = 0;
+  long clientY = 0;
+  long screenX = 0;
+  long screenY = 0;
+  long pageX = 0;
+  long pageY = 0;
+  float radiusX = 0;
+  float radiusY = 0;
+  float rotationAngle = 0;
+  float force = 0;
+};
+
+[Func="mozilla::dom::Touch::PrefEnabled",
+ Exposed=Window]
+interface Touch {
+  constructor(TouchInit touchInitDict);
+
+  readonly    attribute long         identifier;
+  readonly    attribute EventTarget? target;
+  [NeedsCallerType]
+  readonly    attribute long         screenX;
+  [NeedsCallerType]
+  readonly    attribute long         screenY;
+
+  readonly    attribute long         clientX;
+  readonly    attribute long         clientY;
+  readonly    attribute long         pageX;
+  readonly    attribute long         pageY;
+  [NeedsCallerType]
+  readonly    attribute long         radiusX;
+  [NeedsCallerType]
+  readonly    attribute long         radiusY;
+  [NeedsCallerType]
+  readonly    attribute float        rotationAngle;
+  [NeedsCallerType]
+  readonly    attribute float        force;
+};
diff --git a/dom/webidl/TouchEvent.webidl b/dom/webidl/TouchEvent.webidl
new file mode 100644
index 0000000000..9cc14505da
--- /dev/null
+++ b/dom/webidl/TouchEvent.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary TouchEventInit : EventModifierInit {
+  sequence<Touch> touches = [];
+  sequence<Touch> targetTouches = [];
+  sequence<Touch> changedTouches = [];
+};
+
+[Func="mozilla::dom::TouchEvent::PrefEnabled",
+ Exposed=Window]
+interface TouchEvent : UIEvent {
+  constructor(DOMString type, optional TouchEventInit eventInitDict = {});
+
+  readonly attribute TouchList touches;
+  readonly attribute TouchList targetTouches;
+  readonly attribute TouchList changedTouches;
+
+  readonly attribute boolean altKey;
+  readonly attribute boolean metaKey;
+  readonly attribute boolean ctrlKey;
+  readonly attribute boolean shiftKey;
+
+  undefined initTouchEvent(DOMString type,
+                           optional boolean canBubble = false,
+                           optional boolean cancelable = false,
+                           optional Window? view = null,
+                           optional long detail = 0,
+                           optional boolean ctrlKey = false,
+                           optional boolean altKey = false,
+                           optional boolean shiftKey = false,
+                           optional boolean metaKey = false,
+                           optional TouchList? touches = null,
+                           optional TouchList? targetTouches = null,
+                           optional TouchList? changedTouches = null);
+};
diff --git a/dom/webidl/TouchList.webidl b/dom/webidl/TouchList.webidl
new file mode 100644
index 0000000000..a6fc8f5e3d
--- /dev/null
+++ b/dom/webidl/TouchList.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://dvcs.w3.org/hg/webevents/raw-file/v1/touchevents.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Func="mozilla::dom::TouchList::PrefEnabled",
+ Exposed=Window]
+interface TouchList {
+  [Pure]
+  readonly attribute unsigned long length;
+  getter Touch? item(unsigned long index);
+};
diff --git a/dom/webidl/TrackEvent.webidl b/dom/webidl/TrackEvent.webidl
new file mode 100644
index 0000000000..730c2b8148
--- /dev/null
+++ b/dom/webidl/TrackEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#trackevent
+ */
+
+[Exposed=Window]
+interface TrackEvent : Event
+{
+  constructor(DOMString type, optional TrackEventInit eventInitDict = {});
+
+  readonly attribute (VideoTrack or AudioTrack or TextTrack)? track;
+};
+
+dictionary TrackEventInit : EventInit
+{
+  (VideoTrack or AudioTrack or TextTrack)? track = null;
+};
diff --git a/dom/webidl/TransformStream.webidl b/dom/webidl/TransformStream.webidl
new file mode 100644
index 0000000000..3dcc74eedd
--- /dev/null
+++ b/dom/webidl/TransformStream.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#ts-class-definition
+ */
+
+[Exposed=*] // [Transferable] - See Bug 1562065
+interface TransformStream {
+  [Throws]
+  constructor(optional object transformer,
+              optional QueuingStrategy writableStrategy = {},
+              optional QueuingStrategy readableStrategy = {});
+
+  readonly attribute ReadableStream readable;
+  readonly attribute WritableStream writable;
+};
diff --git a/dom/webidl/TransformStreamDefaultController.webidl b/dom/webidl/TransformStreamDefaultController.webidl
new file mode 100644
index 0000000000..d7808672aa
--- /dev/null
+++ b/dom/webidl/TransformStreamDefaultController.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#ts-default-controller-class-definition
+ */
+
+[Exposed=*]
+interface TransformStreamDefaultController {
+  readonly attribute unrestricted double? desiredSize;
+  [Throws] undefined enqueue(optional any chunk);
+  [Throws] undefined error(optional any reason);
+  [Throws] undefined terminate();
+};
diff --git a/dom/webidl/Transformer.webidl b/dom/webidl/Transformer.webidl
new file mode 100644
index 0000000000..215a0fe24b
--- /dev/null
+++ b/dom/webidl/Transformer.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#transformer-api
+ */
+
+[GenerateInit]
+dictionary Transformer {
+  TransformerStartCallback start;
+  TransformerTransformCallback transform;
+  TransformerFlushCallback flush;
+  any readableType;
+  any writableType;
+};
+
+callback TransformerStartCallback = any (TransformStreamDefaultController controller);
+callback TransformerFlushCallback = Promise<undefined> (TransformStreamDefaultController controller);
+callback TransformerTransformCallback = Promise<undefined> (any chunk, TransformStreamDefaultController controller);
diff --git a/dom/webidl/TransitionEvent.webidl b/dom/webidl/TransitionEvent.webidl
new file mode 100644
index 0000000000..b609e414d3
--- /dev/null
+++ b/dom/webidl/TransitionEvent.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Transition events are defined in:
+ * http://www.w3.org/TR/css3-transitions/#transition-events-
+ * http://dev.w3.org/csswg/css3-transitions/#transition-events-
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface TransitionEvent : Event {
+  constructor(DOMString type, optional TransitionEventInit eventInitDict = {});
+
+  readonly attribute DOMString propertyName;
+  readonly attribute float     elapsedTime;
+  readonly attribute DOMString pseudoElement;
+};
+
+dictionary TransitionEventInit : EventInit {
+  DOMString propertyName = "";
+  float elapsedTime = 0;
+  DOMString pseudoElement = "";
+};
diff --git a/dom/webidl/TreeColumn.webidl b/dom/webidl/TreeColumn.webidl
new file mode 100644
index 0000000000..71292f03dc
--- /dev/null
+++ b/dom/webidl/TreeColumn.webidl
@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[ChromeOnly, Exposed=Window]
+interface TreeColumn {
+  readonly attribute Element element;
+
+  readonly attribute TreeColumns? columns;
+
+  [Throws]
+  readonly attribute long x;
+  [Throws]
+  readonly attribute long width;
+
+  readonly attribute DOMString id;
+  readonly attribute long index;
+
+  readonly attribute boolean primary;
+  readonly attribute boolean cycler;
+  readonly attribute boolean editable;
+
+  const short TYPE_TEXT                = 1;
+  const short TYPE_CHECKBOX            = 2;
+  readonly attribute short type;
+
+  TreeColumn? getNext();
+  TreeColumn? getPrevious();
+
+  /**
+   * Returns the previous displayed column, if any, accounting for
+   * the ordinals set on the columns.
+   */
+  readonly attribute TreeColumn? previousColumn;
+
+  [Throws]
+  undefined invalidate();
+};
diff --git a/dom/webidl/TreeColumns.webidl b/dom/webidl/TreeColumns.webidl
new file mode 100644
index 0000000000..417669aa1f
--- /dev/null
+++ b/dom/webidl/TreeColumns.webidl
@@ -0,0 +1,53 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[ChromeOnly,
+ Exposed=Window]
+interface TreeColumns {
+  /**
+   * The tree widget for these columns.
+   */
+  readonly attribute XULTreeElement? tree;
+
+  /**
+   * The number of columns.
+   */
+  readonly attribute unsigned long count;
+
+  /**
+   * An alias for count (for the benefit of scripts which treat this as an
+   * array).
+   */
+  readonly attribute unsigned long length;
+
+  /**
+   * Get the first/last column.
+   */
+  TreeColumn? getFirstColumn();
+  TreeColumn? getLastColumn();
+
+  /**
+   * Attribute based column getters.
+   */
+  TreeColumn? getPrimaryColumn();
+  TreeColumn? getSortedColumn();
+  TreeColumn? getKeyColumn();
+
+  /**
+   * Get the column for the given element.
+   */
+  TreeColumn? getColumnFor(Element? element);
+
+  /**
+   * Parametric column getters.
+   */
+  getter TreeColumn? getNamedColumn(DOMString name);
+  getter TreeColumn? getColumnAt(unsigned long index);
+
+  /**
+   * This method is called whenever a treecol is added or removed and
+   * the column cache needs to be rebuilt.
+   */
+  undefined invalidateColumns();
+};
diff --git a/dom/webidl/TreeContentView.webidl b/dom/webidl/TreeContentView.webidl
new file mode 100644
index 0000000000..c7ab0cb96f
--- /dev/null
+++ b/dom/webidl/TreeContentView.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[ChromeOnly,
+ Exposed=Window]
+interface TreeContentView
+{
+  /**
+   * Retrieve the content item associated with the specified row.
+   */
+  [Throws]
+  Element? getItemAtIndex(long row);
+
+  /**
+   * Retrieve the index associated with the specified content item.
+   */
+  long getIndexOfItem(Element? item);
+};
+TreeContentView includes TreeView;
diff --git a/dom/webidl/TreeView.webidl b/dom/webidl/TreeView.webidl
new file mode 100644
index 0000000000..4c5d7bc750
--- /dev/null
+++ b/dom/webidl/TreeView.webidl
@@ -0,0 +1,186 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface nsITreeSelection;
+
+interface mixin TreeView
+{
+  /**
+   * The total number of rows in the tree (including the offscreen rows).
+   */
+  readonly attribute long rowCount;
+
+  /**
+   * The selection for this view.
+   */
+  [SetterThrows]
+  attribute nsITreeSelection? selection;
+
+  /**
+   * A whitespace delimited list of properties.  For each property X the view
+   * gives back will cause the pseudoclasses  ::-moz-tree-cell(x),
+   * ::-moz-tree-row(x), ::-moz-tree-twisty(x), ::-moz-tree-image(x),
+   * ::-moz-tree-cell-text(x).  to be matched on the pseudoelement
+   * ::moz-tree-row.
+   */
+  [Throws]
+  DOMString getRowProperties(long row);
+
+  /**
+   * A whitespace delimited list of properties for a given cell.  Each
+   * property, x, that the view gives back will cause the pseudoclasses
+   *  ::-moz-tree-cell(x), ::-moz-tree-row(x), ::-moz-tree-twisty(x),
+   *  ::-moz-tree-image(x), ::-moz-tree-cell-text(x). to be matched on the
+   *  cell.
+   */
+  [Throws]
+  DOMString getCellProperties(long row, TreeColumn column);
+
+  /**
+   * Called to get properties to paint a column background.  For shading the sort
+   * column, etc.
+   */
+  DOMString getColumnProperties(TreeColumn column);
+
+  /**
+   * Methods that can be used to test whether or not a twisty should be drawn,
+   * and if so, whether an open or closed twisty should be used.
+   */
+  [Throws]
+  boolean isContainer(long row);
+  [Throws]
+  boolean isContainerOpen(long row);
+  [Throws]
+  boolean isContainerEmpty(long row);
+
+  /**
+   * isSeparator is used to determine if the row is a separator.
+   * A value of true will result in the tree drawing a horizontal separator.
+   * The tree uses the ::moz-tree-separator pseudoclass to draw the separator.
+   */
+  [Throws]
+  boolean isSeparator(long row);
+
+  /**
+   * Specifies if there is currently a sort on any column. Used mostly by dragdrop
+   * to affect drop feedback.
+   */
+  boolean isSorted();
+
+  const short DROP_BEFORE = -1;
+  const short DROP_ON = 0;
+  const short DROP_AFTER = 1;
+  /**
+   * Methods used by the drag feedback code to determine if a drag is allowable at
+   * the current location. To get the behavior where drops are only allowed on
+   * items, such as the mailNews folder pane, always return false when
+   * the orientation is not DROP_ON.
+   */
+  [Throws]
+  boolean canDrop(long row, long orientation, DataTransfer? dataTransfer);
+
+  /**
+   * Called when the user drops something on this view. The |orientation| param
+   * specifies before/on/after the given |row|.
+   */
+  [Throws]
+  undefined drop(long row, long orientation, DataTransfer? dataTransfer);
+
+  /**
+   * Methods used by the tree to draw thread lines in the tree.
+   * getParentIndex is used to obtain the index of a parent row.
+   * If there is no parent row, getParentIndex returns -1.
+   */
+  [Throws]
+  long getParentIndex(long row);
+
+  /**
+   * hasNextSibling is used to determine if the row at rowIndex has a nextSibling
+   * that occurs *after* the index specified by afterIndex.  Code that is forced
+   * to march down the view looking at levels can optimize the march by starting
+   * at afterIndex+1.
+   */
+  [Throws]
+  boolean hasNextSibling(long row, long afterIndex);
+
+  /**
+   * The level is an integer value that represents
+   * the level of indentation.  It is multiplied by the width specified in the
+   * :moz-tree-indentation pseudoelement to compute the exact indendation.
+   */
+  [Throws]
+  long getLevel(long row);
+
+  /**
+   * The image path for a given cell. For defining an icon for a cell.
+   * If the empty string is returned, the :moz-tree-image pseudoelement
+   * will be used.
+   */
+  [Throws]
+  DOMString getImageSrc(long row, TreeColumn column);
+
+  /**
+   * The value for a given cell. This method is only called for columns
+   * of type other than |text|.
+   */
+  [Throws]
+  DOMString getCellValue(long row, TreeColumn column);
+
+  /**
+   * The text for a given cell.  If a column consists only of an image, then
+   * the empty string is returned.
+   */
+  [Throws]
+  DOMString getCellText(long row, TreeColumn column);
+
+  /**
+   * Called during initialization to link the view to the front end box object.
+   */
+  [Throws]
+  undefined setTree(XULTreeElement? tree);
+
+  /**
+   * Called on the view when an item is opened or closed.
+   */
+  [Throws]
+  undefined toggleOpenState(long row);
+
+  /**
+   * Called on the view when a header is clicked.
+   */
+  [Throws]
+  undefined cycleHeader(TreeColumn column);
+
+  /**
+   * Should be called from a XUL onselect handler whenever the selection changes.
+   */
+  undefined selectionChanged();
+
+  /**
+   * Called on the view when a cell in a non-selectable cycling column (e.g., unread/flag/etc.) is clicked.
+   */
+  undefined cycleCell(long row, TreeColumn column);
+
+  /**
+   * isEditable is called to ask the view if the cell contents are editable.
+   * A value of true will result in the tree popping up a text field when
+   * the user tries to inline edit the cell.
+   */
+  [Throws]
+  boolean isEditable(long row, TreeColumn column);
+
+  /**
+   * setCellValue is called when the value of the cell has been set by the user.
+   * This method is only called for columns of type other than |text|.
+   */
+  [Throws]
+  undefined setCellValue(long row, TreeColumn column, DOMString value);
+
+  /**
+   * setCellText is called when the contents of the cell have been edited by the user.
+   */
+  [Throws]
+  undefined setCellText(long row, TreeColumn column, DOMString value);
+};
diff --git a/dom/webidl/TreeWalker.webidl b/dom/webidl/TreeWalker.webidl
new file mode 100644
index 0000000000..a94224ef7b
--- /dev/null
+++ b/dom/webidl/TreeWalker.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface TreeWalker {
+  [Constant]
+  readonly attribute Node root;
+  [Constant]
+  readonly attribute unsigned long whatToShow;
+  [Constant]
+  readonly attribute NodeFilter? filter;
+  [Pure, SetterThrows]
+           attribute Node currentNode;
+
+  [Throws]
+  Node? parentNode();
+  [Throws]
+  Node? firstChild();
+  [Throws]
+  Node? lastChild();
+  [Throws]
+  Node? previousSibling();
+  [Throws]
+  Node? nextSibling();
+  [Throws]
+  Node? previousNode();
+  [Throws]
+  Node? nextNode();
+};
diff --git a/dom/webidl/UDPMessageEvent.webidl b/dom/webidl/UDPMessageEvent.webidl
new file mode 100644
index 0000000000..22ffc83f89
--- /dev/null
+++ b/dom/webidl/UDPMessageEvent.webidl
@@ -0,0 +1,27 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/TR/raw-sockets/#interface-udpmessageevent
+ */
+
+//Bug 1056444: This interface should be removed after UDPSocket.input/UDPSocket.output are ready.
+[Pref="dom.udpsocket.enabled",
+ ChromeOnly,
+ Exposed=Window]
+interface UDPMessageEvent : Event {
+    constructor(DOMString type,
+                optional UDPMessageEventInit eventInitDict = {});
+
+    readonly    attribute DOMString      remoteAddress;
+    readonly    attribute unsigned short remotePort;
+    readonly    attribute any            data;
+};
+
+dictionary UDPMessageEventInit : EventInit {
+  DOMString remoteAddress = "";
+  unsigned short remotePort = 0;
+  any data = null;
+};
diff --git a/dom/webidl/UDPSocket.webidl b/dom/webidl/UDPSocket.webidl
new file mode 100644
index 0000000000..a345253a6c
--- /dev/null
+++ b/dom/webidl/UDPSocket.webidl
@@ -0,0 +1,43 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.w3.org/2012/sysapps/tcp-udp-sockets/#interface-udpsocket
+ * http://www.w3.org/2012/sysapps/tcp-udp-sockets/#dictionary-udpoptions
+ */
+
+dictionary UDPOptions {
+    DOMString      localAddress;
+    unsigned short localPort;
+    DOMString      remoteAddress;
+    unsigned short remotePort;
+    boolean        addressReuse = true;
+    boolean        loopback = false;
+};
+
+[Pref="dom.udpsocket.enabled",
+ ChromeOnly,
+ Exposed=Window]
+interface UDPSocket : EventTarget {
+    [Throws]
+    constructor(optional UDPOptions options = {});
+
+    readonly    attribute DOMString?       localAddress;
+    readonly    attribute unsigned short?  localPort;
+    readonly    attribute DOMString?       remoteAddress;
+    readonly    attribute unsigned short?  remotePort;
+    readonly    attribute boolean          addressReuse;
+    readonly    attribute boolean          loopback;
+    readonly    attribute SocketReadyState readyState;
+    readonly    attribute Promise<undefined> opened;
+    readonly    attribute Promise<undefined> closed;
+//    readonly    attribute ReadableStream   input; //Bug 1056444: Stream API is not ready
+//    readonly    attribute WriteableStream  output; //Bug 1056444: Stream API is not ready
+                attribute EventHandler     onmessage; //Bug 1056444: use event interface before Stream API is ready
+    Promise<undefined> close ();
+    [Throws] undefined    joinMulticastGroup (DOMString multicastGroupAddress);
+    [Throws] undefined    leaveMulticastGroup (DOMString multicastGroupAddress);
+    [Throws] boolean send ((DOMString or Blob or ArrayBuffer or ArrayBufferView) data, optional DOMString? remoteAddress, optional unsigned short? remotePort); //Bug 1056444: use send method before Stream API is ready
+};
diff --git a/dom/webidl/UIEvent.webidl b/dom/webidl/UIEvent.webidl
new file mode 100644
index 0000000000..d384210092
--- /dev/null
+++ b/dom/webidl/UIEvent.webidl
@@ -0,0 +1,64 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface UIEvent : Event
+{
+  constructor(DOMString type, optional UIEventInit eventInitDict = {});
+
+  readonly attribute WindowProxy? view;
+  readonly attribute long         detail;
+  undefined initUIEvent(DOMString aType,
+                        optional boolean aCanBubble = false,
+                        optional boolean aCancelable = false,
+                        optional Window? aView = null,
+                        optional long aDetail = 0);
+};
+
+// Additional DOM0 properties.
+partial interface UIEvent {
+  const long SCROLL_PAGE_UP = -32768;
+  const long SCROLL_PAGE_DOWN = 32768;
+
+  readonly attribute long          layerX;
+  readonly attribute long          layerY;
+  [NeedsCallerType]
+  readonly attribute unsigned long which;
+  readonly attribute Node?         rangeParent;
+  readonly attribute long          rangeOffset;
+};
+
+dictionary UIEventInit : EventInit
+{
+  Window? view = null;
+  long    detail = 0;
+};
+
+// NOTE: Gecko doesn't support commented out modifiers yet.
+dictionary EventModifierInit : UIEventInit
+{
+  boolean ctrlKey = false;
+  boolean shiftKey = false;
+  boolean altKey = false;
+  boolean metaKey = false;
+  boolean modifierAltGraph = false;
+  boolean modifierCapsLock = false;
+  boolean modifierFn = false;
+  boolean modifierFnLock = false;
+  // boolean modifierHyper = false;
+  boolean modifierNumLock = false;
+  boolean modifierOS = false;
+  boolean modifierScrollLock = false;
+  // boolean modifierSuper = false;
+  boolean modifierSymbol = false;
+  boolean modifierSymbolLock = false;
+};
diff --git a/dom/webidl/URL.webidl b/dom/webidl/URL.webidl
new file mode 100644
index 0000000000..9cdd7f7aac
--- /dev/null
+++ b/dom/webidl/URL.webidl
@@ -0,0 +1,59 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origins of this IDL file are
+ * http://url.spec.whatwg.org/#api
+ * https://w3c.github.io/FileAPI/#creating-revoking
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface URI;
+
+[Exposed=(Window,Worker,WorkerDebugger),
+ LegacyWindowAlias=webkitURL]
+interface URL {
+  [Throws]
+  constructor(USVString url, optional USVString base);
+
+  static boolean canParse(USVString url, optional USVString base);
+
+  [SetterThrows]
+  stringifier attribute USVString href;
+  readonly attribute USVString origin;
+           attribute USVString protocol;
+           attribute USVString username;
+           attribute USVString password;
+           attribute USVString host;
+           attribute USVString hostname;
+           attribute USVString port;
+           attribute USVString pathname;
+           attribute USVString search;
+  [SameObject]
+  readonly attribute URLSearchParams searchParams;
+           attribute USVString hash;
+
+  [ChromeOnly]
+  readonly attribute URI URI;
+  [ChromeOnly]
+  static URL fromURI(URI uri);
+
+  USVString toJSON();
+};
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+partial interface URL {
+  [Throws]
+  static DOMString createObjectURL(Blob blob);
+  [Throws]
+  static undefined revokeObjectURL(DOMString url);
+  [ChromeOnly, Throws]
+  static boolean isValidObjectURL(DOMString url);
+
+  // https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+  [Throws]
+  static DOMString createObjectURL(MediaSource source);
+};
diff --git a/dom/webidl/URLSearchParams.webidl b/dom/webidl/URLSearchParams.webidl
new file mode 100644
index 0000000000..4bd473d62a
--- /dev/null
+++ b/dom/webidl/URLSearchParams.webidl
@@ -0,0 +1,37 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://url.spec.whatwg.org/#urlsearchparams
+ *
+ * To the extent possible under law, the editors have waived all copyright
+ * and related or neighboring rights to this work. In addition, as of 17
+ * February 2013, the editors have made this specification available under
+ * the Open Web Foundation Agreement Version 1.0, which is available at
+ * http://www.openwebfoundation.org/legal/the-owf-1-0-agreements/owfa-1-0.
+ */
+
+[Exposed=(Window,Worker,WorkerDebugger),
+ Serializable]
+interface URLSearchParams {
+  [Throws]
+  constructor(optional (sequence<sequence<USVString>> or
+                        record<USVString, USVString> or USVString) init = "");
+
+  readonly attribute unsigned long size;
+
+  undefined append(USVString name, USVString value);
+  undefined delete(USVString name, optional USVString value);
+  USVString? get(USVString name);
+  sequence<USVString> getAll(USVString name);
+  boolean has(USVString name, optional USVString value);
+  undefined set(USVString name, USVString value);
+
+  [Throws]
+  undefined sort();
+
+  iterable<USVString, USVString>;
+  stringifier;
+};
diff --git a/dom/webidl/UnderlyingSink.webidl b/dom/webidl/UnderlyingSink.webidl
new file mode 100644
index 0000000000..6207589344
--- /dev/null
+++ b/dom/webidl/UnderlyingSink.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#underlying-sink-api
+ */
+
+[GenerateInit]
+dictionary UnderlyingSink {
+  UnderlyingSinkStartCallback start;
+  UnderlyingSinkWriteCallback write;
+  UnderlyingSinkCloseCallback close;
+  UnderlyingSinkAbortCallback abort;
+  any type;
+};
+
+callback UnderlyingSinkStartCallback = any (WritableStreamDefaultController controller);
+callback UnderlyingSinkWriteCallback = Promise<undefined> (any chunk, WritableStreamDefaultController controller);
+callback UnderlyingSinkCloseCallback = Promise<undefined> ();
+callback UnderlyingSinkAbortCallback = Promise<undefined> (optional any reason);
diff --git a/dom/webidl/UnderlyingSource.webidl b/dom/webidl/UnderlyingSource.webidl
new file mode 100644
index 0000000000..7b9a95fd6b
--- /dev/null
+++ b/dom/webidl/UnderlyingSource.webidl
@@ -0,0 +1,23 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#underlying-source-api
+ */
+
+[GenerateInit]
+dictionary UnderlyingSource {
+  UnderlyingSourceStartCallback start;
+  UnderlyingSourcePullCallback pull;
+  UnderlyingSourceCancelCallback cancel;
+  ReadableStreamType type;
+  [EnforceRange] unsigned long long autoAllocateChunkSize;
+};
+
+typedef (ReadableStreamDefaultController or ReadableByteStreamController) ReadableStreamController;
+
+callback UnderlyingSourceStartCallback = any (ReadableStreamController controller);
+callback UnderlyingSourcePullCallback = Promise<undefined> (ReadableStreamController controller);
+callback UnderlyingSourceCancelCallback = Promise<undefined> (optional any reason);
diff --git a/dom/webidl/UserProximityEvent.webidl b/dom/webidl/UserProximityEvent.webidl
new file mode 100644
index 0000000000..67ae1ceef2
--- /dev/null
+++ b/dom/webidl/UserProximityEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Pref="device.sensors.proximity.enabled", Func="nsGlobalWindowInner::DeviceSensorsEnabled",
+ Exposed=Window]
+interface UserProximityEvent : Event
+{
+    constructor(DOMString type,
+                optional UserProximityEventInit eventInitDict = {});
+
+    readonly attribute boolean near;
+};
+
+dictionary UserProximityEventInit : EventInit
+{
+  boolean near = false;
+};
diff --git a/dom/webidl/VRDisplay.webidl b/dom/webidl/VRDisplay.webidl
new file mode 100644
index 0000000000..d1ce4b949e
--- /dev/null
+++ b/dom/webidl/VRDisplay.webidl
@@ -0,0 +1,325 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://immersive-web.github.io/webvr/spec/1.1/
+ */
+
+enum VREye {
+  "left",
+  "right"
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRFieldOfView {
+  readonly attribute double upDegrees;
+  readonly attribute double rightDegrees;
+  readonly attribute double downDegrees;
+  readonly attribute double leftDegrees;
+};
+
+typedef (HTMLCanvasElement or OffscreenCanvas) VRSource;
+
+dictionary VRLayer {
+  /**
+   * XXX - When WebVR in WebWorkers is implemented, HTMLCanvasElement below
+   *       should be replaced with VRSource.
+   */
+  HTMLCanvasElement? source = null;
+
+  /**
+   * The left and right viewports contain 4 values defining the viewport
+   * rectangles within the canvas to present to the eye in UV space.
+   * [0] left offset of the viewport (0.0 - 1.0)
+   * [1] top offset of the viewport (0.0 - 1.0)
+   * [2] width of the viewport (0.0 - 1.0)
+   * [3] height of the viewport (0.0 - 1.0)
+   *
+   * When no values are passed, they will be processed as though the left
+   * and right sides of the viewport were passed:
+   *
+   * leftBounds: [0.0, 0.0, 0.5, 1.0]
+   * rightBounds: [0.5, 0.0, 0.5, 1.0]
+   */
+  sequence<float> leftBounds = [];
+  sequence<float> rightBounds = [];
+};
+
+/**
+ * Values describing the capabilities of a VRDisplay.
+ * These are expected to be static per-device/per-user.
+ */
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRDisplayCapabilities {
+  /**
+   * hasPosition is true if the VRDisplay is capable of tracking its position.
+   */
+  readonly attribute boolean hasPosition;
+
+  /**
+   * hasOrientation is true if the VRDisplay is capable of tracking its orientation.
+   */
+  readonly attribute boolean hasOrientation;
+
+  /**
+   * Whether the VRDisplay is separate from the device’s
+   * primary display. If presenting VR content will obscure
+   * other content on the device, this should be false. When
+   * false, the application should not attempt to mirror VR content
+   * or update non-VR UI because that content will not be visible.
+   */
+  readonly attribute boolean hasExternalDisplay;
+
+  /**
+   * Whether the VRDisplay is capable of presenting content to an HMD or similar device.
+   * Can be used to indicate “magic window” devices that are capable of 6DoF tracking but for
+   * which requestPresent is not meaningful. If false then calls to requestPresent should
+   * always fail, and getEyeParameters should return null.
+   */
+  readonly attribute boolean canPresent;
+
+  /**
+   * Indicates the maximum length of the array that requestPresent() will accept. MUST be 1 if
+     canPresent is true, 0 otherwise.
+   */
+  readonly attribute unsigned long maxLayers;
+};
+
+/**
+ * Values describing the the stage / play area for devices
+ * that support room-scale experiences.
+ */
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRStageParameters {
+  /**
+   * A 16-element array containing the components of a column-major 4x4
+   * affine transform matrix. This matrix transforms the sitting-space position
+   * returned by get{Immediate}Pose() to a standing-space position.
+   */
+  [Throws] readonly attribute Float32Array sittingToStandingTransform;
+
+  /**
+   * Dimensions of the play-area bounds. The bounds are defined
+   * as an axis-aligned rectangle on the floor.
+   * The center of the rectangle is at (0,0,0) in standing-space
+   * coordinates.
+   * These bounds are defined for safety purposes.
+   * Content should not require the user to move beyond these
+   * bounds; however, it is possible for the user to ignore
+   * the bounds resulting in position values outside of
+   * this rectangle.
+   */
+  readonly attribute float sizeX;
+  readonly attribute float sizeZ;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRPose
+{
+  /**
+   * position, linearVelocity, and linearAcceleration are 3-component vectors.
+   * position is relative to a sitting space. Transforming this point with
+   * VRStageParameters.sittingToStandingTransform converts this to standing space.
+   */
+  [Constant, Throws] readonly attribute Float32Array? position;
+  [Constant, Throws] readonly attribute Float32Array? linearVelocity;
+  [Constant, Throws] readonly attribute Float32Array? linearAcceleration;
+
+  /* orientation is a 4-entry array representing the components of a quaternion. */
+  [Constant, Throws] readonly attribute Float32Array? orientation;
+  /* angularVelocity and angularAcceleration are the components of 3-dimensional vectors. */
+  [Constant, Throws] readonly attribute Float32Array? angularVelocity;
+  [Constant, Throws] readonly attribute Float32Array? angularAcceleration;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRFrameData {
+  constructor();
+
+  readonly attribute DOMHighResTimeStamp timestamp;
+
+  [Throws, Pure] readonly attribute Float32Array leftProjectionMatrix;
+  [Throws, Pure] readonly attribute Float32Array leftViewMatrix;
+
+  [Throws, Pure] readonly attribute Float32Array rightProjectionMatrix;
+  [Throws, Pure] readonly attribute Float32Array rightViewMatrix;
+
+  [Pure] readonly attribute VRPose pose;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VREyeParameters {
+  /**
+   * offset is a 3-component vector representing an offset to
+   * translate the eye. This value may vary from frame
+   * to frame if the user adjusts their headset ipd.
+   */
+  [Constant, Throws] readonly attribute Float32Array offset;
+
+  /* These values may vary as the user adjusts their headset ipd. */
+  [Constant] readonly attribute VRFieldOfView fieldOfView;
+
+  /**
+   * renderWidth and renderHeight specify the recommended render target
+   * size of each eye viewport, in pixels. If multiple eyes are rendered
+   * in a single render target, then the render target should be made large
+   * enough to fit both viewports.
+   */
+  [Constant] readonly attribute unsigned long renderWidth;
+  [Constant] readonly attribute unsigned long renderHeight;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRDisplay : EventTarget {
+  /**
+   * presentingGroups is a bitmask indicating which VR session groups
+   * have an active VR presentation.
+   */
+  [ChromeOnly] readonly attribute unsigned long presentingGroups;
+  /**
+   * Setting groupMask causes submitted frames by VR sessions that
+   * aren't included in the bitmasked groups to be ignored.
+   * Non-chrome content is not aware of the value of groupMask.
+   * VRDisplay.RequestAnimationFrame will still fire for VR sessions
+   * that are hidden by groupMask, enabling their performance to be
+   * measured by chrome UI that is presented in other groups.
+   * This is expected to be used in cases where chrome UI is presenting
+   * information during link traversal or presenting options when content
+   * performance is too low for comfort.
+   * The VR refresh / VSync cycle is driven by the visible content
+   * and the non-visible content may have a throttled refresh rate.
+   */
+  [ChromeOnly] attribute unsigned long groupMask;
+
+  readonly attribute boolean isConnected;
+  readonly attribute boolean isPresenting;
+
+  /**
+   * Dictionary of capabilities describing the VRDisplay.
+   */
+  [Constant] readonly attribute VRDisplayCapabilities capabilities;
+
+  /**
+   * If this VRDisplay supports room-scale experiences, the optional
+   * stage attribute contains details on the room-scale parameters.
+   */
+  readonly attribute VRStageParameters? stageParameters;
+
+  /* Return the current VREyeParameters for the given eye. */
+  VREyeParameters getEyeParameters(VREye whichEye);
+
+  /**
+   * An identifier for this distinct VRDisplay. Used as an
+   * association point in the Gamepad API.
+   */
+  [Constant] readonly attribute unsigned long displayId;
+
+  /**
+   * A display name, a user-readable name identifying it.
+   */
+  [Constant] readonly attribute DOMString displayName;
+
+  /**
+   * Populates the passed VRFrameData with the information required to render
+   * the current frame.
+   */
+  boolean getFrameData(VRFrameData frameData);
+
+  /**
+   * Return a VRPose containing the future predicted pose of the VRDisplay
+   * when the current frame will be presented. Subsequent calls to getPose()
+   * MUST return a VRPose with the same values until the next call to
+   * submitFrame().
+   *
+   * The VRPose will contain the position, orientation, velocity,
+   * and acceleration of each of these properties.
+   */
+  [NewObject] VRPose getPose();
+
+  /**
+   * Reset the pose for this display, treating its current position and
+   * orientation as the "origin/zero" values. VRPose.position,
+   * VRPose.orientation, and VRStageParameters.sittingToStandingTransform may be
+   * updated when calling resetPose(). This should be called in only
+   * sitting-space experiences.
+   */
+  undefined resetPose();
+
+  /**
+   * z-depth defining the near plane of the eye view frustum
+   * enables mapping of values in the render target depth
+   * attachment to scene coordinates. Initially set to 0.01.
+   */
+  attribute double depthNear;
+
+  /**
+   * z-depth defining the far plane of the eye view frustum
+   * enables mapping of values in the render target depth
+   * attachment to scene coordinates. Initially set to 10000.0.
+   */
+  attribute double depthFar;
+
+  /**
+   * The callback passed to `requestAnimationFrame` will be called
+   * any time a new frame should be rendered. When the VRDisplay is
+   * presenting the callback will be called at the native refresh
+   * rate of the HMD. When not presenting this function acts
+   * identically to how window.requestAnimationFrame acts. Content should
+   * make no assumptions of frame rate or vsync behavior as the HMD runs
+   * asynchronously from other displays and at differing refresh rates.
+   */
+  [Throws] long requestAnimationFrame(FrameRequestCallback callback);
+
+  /**
+   * Passing the value returned by `requestAnimationFrame` to
+   * `cancelAnimationFrame` will unregister the callback.
+   */
+  [Throws] undefined cancelAnimationFrame(long handle);
+
+  /**
+   * Begin presenting to the VRDisplay. Must be called in response to a user gesture.
+   * Repeat calls while already presenting will update the VRLayers being displayed.
+   */
+  [NewObject, NeedsCallerType] Promise<undefined> requestPresent(sequence<VRLayer> layers);
+
+  /**
+   * Stops presenting to the VRDisplay.
+   */
+  [NewObject] Promise<undefined> exitPresent();
+
+  /**
+   * Get the layers currently being presented.
+   */
+  sequence<VRLayer> getLayers();
+
+  /**
+   * The VRLayer provided to the VRDisplay will be captured and presented
+   * in the HMD. Calling this function has the same effect on the source
+   * canvas as any other operation that uses its source image, and canvases
+   * created without preserveDrawingBuffer set to true will be cleared.
+   */
+  undefined submitFrame();
+};
diff --git a/dom/webidl/VRDisplayEvent.webidl b/dom/webidl/VRDisplayEvent.webidl
new file mode 100644
index 0000000000..41407ec615
--- /dev/null
+++ b/dom/webidl/VRDisplayEvent.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+enum VRDisplayEventReason {
+  "mounted",
+  "navigation",
+  "requested",
+  "unmounted",
+};
+
+dictionary VRDisplayEventInit : EventInit {
+  required VRDisplay display;
+  VRDisplayEventReason reason;
+};
+
+[Pref="dom.vr.enabled",
+ SecureContext,
+ Exposed=Window]
+interface VRDisplayEvent : Event {
+  constructor(DOMString type, VRDisplayEventInit eventInitDict);
+
+  readonly attribute VRDisplay display;
+  readonly attribute VRDisplayEventReason? reason;
+};
diff --git a/dom/webidl/VRServiceTest.webidl b/dom/webidl/VRServiceTest.webidl
new file mode 100644
index 0000000000..fec95dba07
--- /dev/null
+++ b/dom/webidl/VRServiceTest.webidl
@@ -0,0 +1,84 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This WebIDL is just for WebVR testing.
+ */
+
+[Pref="dom.vr.puppet.enabled",
+ HeaderFile="mozilla/dom/VRServiceTest.h",
+ Exposed=Window]
+interface VRMockDisplay {
+  undefined create();
+  attribute boolean capPosition;
+  attribute boolean capOrientation;
+  attribute boolean capPresent;
+  attribute boolean capExternal;
+  attribute boolean capAngularAcceleration;
+  attribute boolean capLinearAcceleration;
+  attribute boolean capStageParameters;
+  attribute boolean capMountDetection;
+  attribute boolean capPositionEmulated;
+  undefined setEyeFOV(VREye eye,
+                      double upDegree, double rightDegree,
+                      double downDegree, double leftDegree);
+  undefined setEyeOffset(VREye eye, double offsetX,
+                         double offsetY, double offsetZ);
+  undefined setEyeResolution(unsigned long renderWidth,
+                             unsigned long renderHeight);
+  undefined setConnected(boolean connected);
+  undefined setMounted(boolean mounted);
+  undefined setStageSize(double width, double height);
+  [Throws] undefined setSittingToStandingTransform(Float32Array sittingToStandingTransform);
+  [Throws] undefined setPose(Float32Array? position, Float32Array? linearVelocity,
+                             Float32Array? linearAcceleration, Float32Array? orientation,
+                             Float32Array? angularVelocity, Float32Array? angularAcceleration);
+};
+
+[Pref="dom.vr.puppet.enabled",
+ HeaderFile="mozilla/dom/VRServiceTest.h",
+ Exposed=Window]
+interface VRMockController {
+  undefined create();
+  undefined clear();
+  attribute GamepadHand hand;
+  attribute boolean capPosition;
+  attribute boolean capOrientation;
+  attribute boolean capAngularAcceleration;
+  attribute boolean capLinearAcceleration;
+  attribute unsigned long axisCount;
+  attribute unsigned long buttonCount;
+  attribute unsigned long hapticCount;
+  [Throws] undefined setPose(Float32Array? position, Float32Array? linearVelocity,
+                             Float32Array? linearAcceleration, Float32Array? orientation,
+                             Float32Array? angularVelocity, Float32Array? angularAcceleration);
+  undefined setButtonPressed(unsigned long buttonIdx, boolean pressed);
+  undefined setButtonTouched(unsigned long buttonIdx, boolean touched);
+  undefined setButtonTrigger(unsigned long buttonIdx, double trigger);
+  undefined setAxisValue(unsigned long axisIdx, double value);
+};
+
+[Pref="dom.vr.puppet.enabled",
+ HeaderFile="mozilla/dom/VRServiceTest.h",
+ Exposed=Window]
+interface VRServiceTest {
+  VRMockDisplay getVRDisplay();
+  [Throws] VRMockController getVRController(unsigned long controllerIdx);
+  [NewObject] Promise<undefined> run();
+  [NewObject] Promise<undefined> reset();
+  undefined commit();
+  undefined end();
+  undefined clearAll();
+  undefined timeout(unsigned long duration);
+  undefined wait(unsigned long duration);
+  undefined waitSubmit();
+  undefined waitPresentationStart();
+  undefined waitPresentationEnd();
+  [Throws]
+  undefined waitHapticIntensity(unsigned long controllerIdx, unsigned long hapticIdx, double intensity);
+  undefined captureFrame();
+  undefined acknowledgeFrame();
+  undefined rejectFrame();
+  undefined startTimer();
+  undefined stopTimer();
+};
diff --git a/dom/webidl/VTTCue.webidl b/dom/webidl/VTTCue.webidl
new file mode 100644
index 0000000000..92855ac778
--- /dev/null
+++ b/dom/webidl/VTTCue.webidl
@@ -0,0 +1,76 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dev.w3.org/html5/webvtt/#the-vttcue-interface
+ */
+
+enum AutoKeyword { "auto" };
+
+enum LineAlignSetting {
+  "start",
+  "center",
+  "end"
+};
+
+enum PositionAlignSetting {
+  "line-left",
+  "center",
+  "line-right",
+  "auto"
+};
+
+enum AlignSetting {
+  "start",
+  "center",
+  "end",
+  "left",
+  "right"
+};
+
+enum DirectionSetting {
+  "",
+  "rl",
+  "lr"
+};
+
+[Exposed=Window]
+interface VTTCue : TextTrackCue {
+  [Throws]
+  constructor(double startTime, double endTime, DOMString text);
+
+  [Pref="media.webvtt.regions.enabled"]
+  attribute VTTRegion? region;
+  attribute DirectionSetting vertical;
+  attribute boolean snapToLines;
+  attribute (double or AutoKeyword) line;
+  [SetterThrows]
+  attribute LineAlignSetting lineAlign;
+  [SetterThrows]
+  attribute (double or AutoKeyword) position;
+  [SetterThrows]
+  attribute PositionAlignSetting positionAlign;
+  [SetterThrows]
+  attribute double size;
+  attribute AlignSetting align;
+  attribute DOMString text;
+  DocumentFragment getCueAsHTML();
+};
+
+// Mozilla extensions.
+partial interface VTTCue {
+  [ChromeOnly]
+  attribute HTMLDivElement? displayState;
+  [ChromeOnly]
+  readonly attribute boolean hasBeenReset;
+  [ChromeOnly]
+  readonly attribute double computedLine;
+  [ChromeOnly]
+  readonly attribute double computedPosition;
+  [ChromeOnly]
+  readonly attribute PositionAlignSetting computedPositionAlign;
+  [ChromeOnly]
+  readonly attribute boolean getActive;
+};
diff --git a/dom/webidl/VTTRegion.webidl b/dom/webidl/VTTRegion.webidl
new file mode 100644
index 0000000000..359e5d9a8b
--- /dev/null
+++ b/dom/webidl/VTTRegion.webidl
@@ -0,0 +1,36 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webvtt/#the-vttregion-interface
+ */
+
+enum ScrollSetting {
+  "",
+  "up"
+};
+
+[Pref="media.webvtt.regions.enabled",
+ Exposed=Window]
+interface VTTRegion {
+  [Throws]
+  constructor();
+
+           attribute DOMString id;
+           [SetterThrows]
+           attribute double width;
+           [SetterThrows]
+           attribute long lines;
+           [SetterThrows]
+           attribute double regionAnchorX;
+           [SetterThrows]
+           attribute double regionAnchorY;
+           [SetterThrows]
+           attribute double viewportAnchorX;
+           [SetterThrows]
+           attribute double viewportAnchorY;
+
+           attribute ScrollSetting scroll;
+};
diff --git a/dom/webidl/ValidityState.webidl b/dom/webidl/ValidityState.webidl
new file mode 100644
index 0000000000..9df58a975e
--- /dev/null
+++ b/dom/webidl/ValidityState.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#validitystate
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[Exposed=Window]
+interface ValidityState {
+  readonly attribute boolean valueMissing;
+  readonly attribute boolean typeMismatch;
+  readonly attribute boolean patternMismatch;
+  readonly attribute boolean tooLong;
+  readonly attribute boolean tooShort;
+  readonly attribute boolean rangeUnderflow;
+  readonly attribute boolean rangeOverflow;
+  readonly attribute boolean stepMismatch;
+  readonly attribute boolean badInput;
+  readonly attribute boolean customError;
+  readonly attribute boolean valid;
+};
diff --git a/dom/webidl/VideoColorSpace.webidl b/dom/webidl/VideoColorSpace.webidl
new file mode 100644
index 0000000000..c2ff8e81ad
--- /dev/null
+++ b/dom/webidl/VideoColorSpace.webidl
@@ -0,0 +1,54 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webcodecs/#videocolorspace
+ */
+
+[Exposed=(Window,DedicatedWorker), Pref="dom.media.webcodecs.enabled"]
+interface VideoColorSpace {
+  [Throws]
+  constructor(optional VideoColorSpaceInit init = {});
+
+  readonly attribute VideoColorPrimaries? primaries;
+  readonly attribute VideoTransferCharacteristics? transfer;
+  readonly attribute VideoMatrixCoefficients? matrix;
+  readonly attribute boolean? fullRange;
+
+  // https://github.com/w3c/webcodecs/issues/486
+  [Default] object toJSON();
+};
+
+dictionary VideoColorSpaceInit {
+  VideoColorPrimaries? primaries = null;
+  VideoTransferCharacteristics? transfer = null;
+  VideoMatrixCoefficients? matrix = null;
+  boolean? fullRange = null;
+};
+
+enum VideoColorPrimaries {
+  "bt709",      // BT.709, sRGB
+  "bt470bg",    // BT.601 PAL
+  "smpte170m",  // BT.601 NTSC
+  "bt2020",     // BT.2020, BT.2100
+  "smpte432",   // P3 D65
+};
+
+enum VideoTransferCharacteristics {
+  "bt709",         // BT.709
+  "smpte170m",     // BT.601 (functionally the same as bt709)
+  "iec61966-2-1",  // sRGB
+  "linear",        // linear RGB
+  "pq",            // BT.2100 PQ
+  "hlg",           // BT.2100 HLG
+};
+
+enum VideoMatrixCoefficients {
+  "rgb",        // sRGB
+  "bt709",      // BT.709
+  "bt470bg",    // BT.601 PAL
+  "smpte170m",  // BT.601 NTSC (functionally the same as bt470bg)
+  "bt2020-ncl", // BT.2020 NCL
+};
diff --git a/dom/webidl/VideoFrame.webidl b/dom/webidl/VideoFrame.webidl
new file mode 100644
index 0000000000..ebb4496b0a
--- /dev/null
+++ b/dom/webidl/VideoFrame.webidl
@@ -0,0 +1,137 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webcodecs/#videoframe
+ */
+
+enum AlphaOption {
+  "keep",
+  "discard",
+};
+
+// [Serializable, Transferable] are implemented without adding attributes here.
+[Exposed=(Window,DedicatedWorker), Pref="dom.media.webcodecs.enabled"]
+interface VideoFrame {
+  // The constructors should be shorten to:
+  //   ```
+  //   constructor([AllowShared] BufferSource data, VideoFrameBufferInit init);
+  //   constructor(CanvasImageSource image, optional VideoFrameInit init = {});
+  //   ```
+  // However, `[AllowShared] BufferSource` doesn't work for now (bug 1696216), and
+  // `No support for unions as distinguishing arguments yet` error occurs when using
+  //   `constructor(CanvasImageSource image, optional VideoFrameInit init = {})` and
+  //   `constructor(([AllowShared] ArrayBufferView or [AllowShared] ArrayBuffer) data, VideoFrameBufferInit init)`
+  // at the same time (bug 1786410).
+  [Throws]
+  constructor(HTMLImageElement imageElement, optional VideoFrameInit init = {});
+  [Throws]
+  constructor(SVGImageElement svgImageElement, optional VideoFrameInit init = {});
+  [Throws]
+  constructor(HTMLCanvasElement canvasElement, optional VideoFrameInit init = {});
+  [Throws]
+  constructor(HTMLVideoElement videoElement, optional VideoFrameInit init = {});
+  [Throws]
+  constructor(OffscreenCanvas offscreenCanvas, optional VideoFrameInit init = {});
+  [Throws]
+  constructor(ImageBitmap imageBitmap, optional VideoFrameInit init = {});
+  [Throws]
+  constructor(VideoFrame videoFrame, optional VideoFrameInit init = {});
+  [Throws]
+  constructor([AllowShared] ArrayBufferView bufferView, VideoFrameBufferInit init);
+  [Throws]
+  constructor([AllowShared] ArrayBuffer buffer, VideoFrameBufferInit init);
+
+
+  readonly attribute VideoPixelFormat? format;
+  readonly attribute unsigned long codedWidth;
+  readonly attribute unsigned long codedHeight;
+  readonly attribute DOMRectReadOnly? codedRect;
+  readonly attribute DOMRectReadOnly? visibleRect;
+  readonly attribute unsigned long displayWidth;
+  readonly attribute unsigned long displayHeight;
+  readonly attribute unsigned long long? duration;  // microseconds
+  readonly attribute long long timestamp;           // microseconds
+  readonly attribute VideoColorSpace colorSpace;
+
+  [Throws]
+  unsigned long allocationSize(
+      optional VideoFrameCopyToOptions options = {});
+  [Throws]
+  Promise<sequence<PlaneLayout>> copyTo(
+      // bug 1696216: Should be `copyTo([AllowShared] BufferSource destination, ...)`
+      ([AllowShared] ArrayBufferView or [AllowShared] ArrayBuffer) destination,
+      optional VideoFrameCopyToOptions options = {});
+  [Throws]
+  VideoFrame clone();
+  undefined close();
+};
+
+dictionary VideoFrameInit {
+  unsigned long long duration;  // microseconds
+  long long timestamp;          // microseconds
+  AlphaOption alpha = "keep";
+
+  // Default matches image. May be used to efficiently crop. Will trigger
+  // new computation of displayWidth and displayHeight using image’s pixel
+  // aspect ratio unless an explicit displayWidth and displayHeight are given.
+  DOMRectInit visibleRect;
+
+  // Default matches image unless visibleRect is provided.
+  [EnforceRange] unsigned long displayWidth;
+  [EnforceRange] unsigned long displayHeight;
+};
+
+dictionary VideoFrameBufferInit {
+  required VideoPixelFormat format;
+  required [EnforceRange] unsigned long codedWidth;
+  required [EnforceRange] unsigned long codedHeight;
+  required [EnforceRange] long long timestamp;  // microseconds
+  [EnforceRange] unsigned long long duration;   // microseconds
+
+  // Default layout is tightly-packed.
+  sequence<PlaneLayout> layout;
+
+  // Default visible rect is coded size positioned at (0,0)
+  DOMRectInit visibleRect;
+
+  // Default display dimensions match visibleRect.
+  [EnforceRange] unsigned long displayWidth;
+  [EnforceRange] unsigned long displayHeight;
+
+  VideoColorSpaceInit colorSpace;
+};
+
+dictionary VideoFrameCopyToOptions {
+  DOMRectInit rect;
+  sequence<PlaneLayout> layout;
+};
+
+dictionary PlaneLayout {
+  // TODO: https://github.com/w3c/webcodecs/pull/488
+  required [EnforceRange] unsigned long offset;
+  required [EnforceRange] unsigned long stride;
+};
+
+enum VideoPixelFormat {
+  // 4:2:0 Y, U, V
+  "I420",
+  // 4:2:0 Y, U, V, A
+  "I420A",
+  // 4:2:2 Y, U, V
+  "I422",
+  // 4:4:4 Y, U, V
+  "I444",
+  // 4:2:0 Y, UV
+  "NV12",
+  // 32bpp RGBA
+  "RGBA",
+  // 32bpp RGBX (opaque)
+  "RGBX",
+  // 32bpp BGRA
+  "BGRA",
+  // 32bpp BGRX (opaque)
+  "BGRX",
+};
diff --git a/dom/webidl/VideoPlaybackQuality.webidl b/dom/webidl/VideoPlaybackQuality.webidl
new file mode 100644
index 0000000000..67e44d5f05
--- /dev/null
+++ b/dom/webidl/VideoPlaybackQuality.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Pref="media.mediasource.enabled",
+ Exposed=Window]
+interface VideoPlaybackQuality {
+  readonly attribute DOMHighResTimeStamp creationTime;
+  readonly attribute unsigned long totalVideoFrames;
+  readonly attribute unsigned long droppedVideoFrames;
+// At Risk: readonly attribute double totalFrameDelay;
+};
diff --git a/dom/webidl/VideoTrack.webidl b/dom/webidl/VideoTrack.webidl
new file mode 100644
index 0000000000..6c628cbced
--- /dev/null
+++ b/dom/webidl/VideoTrack.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#videotrack
+ */
+
+[Pref="media.track.enabled",
+ Exposed=Window]
+interface VideoTrack {
+  readonly attribute DOMString id;
+  readonly attribute DOMString kind;
+  readonly attribute DOMString label;
+  readonly attribute DOMString language;
+           attribute boolean selected;
+};
diff --git a/dom/webidl/VideoTrackList.webidl b/dom/webidl/VideoTrackList.webidl
new file mode 100644
index 0000000000..8d8bd67360
--- /dev/null
+++ b/dom/webidl/VideoTrackList.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#videotracklist
+ */
+
+[Pref="media.track.enabled",
+ Exposed=Window]
+interface VideoTrackList : EventTarget {
+  readonly attribute unsigned long length;
+  getter VideoTrack (unsigned long index);
+  VideoTrack? getTrackById(DOMString id);
+  readonly attribute long selectedIndex;
+
+           attribute EventHandler onchange;
+           attribute EventHandler onaddtrack;
+           attribute EventHandler onremovetrack;
+};
diff --git a/dom/webidl/VisualViewport.webidl b/dom/webidl/VisualViewport.webidl
new file mode 100644
index 0000000000..bde4b9a1b5
--- /dev/null
+++ b/dom/webidl/VisualViewport.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * https://wicg.github.io/visual-viewport/#the-visualviewport-interface
+ */
+
+[Pref="dom.visualviewport.enabled",
+ Exposed=Window]
+interface VisualViewport : EventTarget {
+  readonly attribute double offsetLeft;
+  readonly attribute double offsetTop;
+
+  readonly attribute double pageLeft;
+  readonly attribute double pageTop;
+
+  readonly attribute double width;
+  readonly attribute double height;
+
+  readonly attribute double scale;
+
+  attribute EventHandler onresize;
+  attribute EventHandler onscroll;
+};
diff --git a/dom/webidl/WaveShaperNode.webidl b/dom/webidl/WaveShaperNode.webidl
new file mode 100644
index 0000000000..7a3374a708
--- /dev/null
+++ b/dom/webidl/WaveShaperNode.webidl
@@ -0,0 +1,38 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum OverSampleType {
+  "none",
+  "2x",
+  "4x"
+};
+
+dictionary WaveShaperOptions : AudioNodeOptions {
+             sequence<float> curve;
+             OverSampleType  oversample = "none";
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface WaveShaperNode : AudioNode {
+  [Throws]
+  constructor(BaseAudioContext context,
+              optional WaveShaperOptions options = {});
+
+      [Cached, Pure, SetterThrows]
+      attribute Float32Array? curve;
+      attribute OverSampleType oversample;
+
+};
+
+// Mozilla extension
+WaveShaperNode includes AudioNodePassThrough;
diff --git a/dom/webidl/WebAuthentication.webidl b/dom/webidl/WebAuthentication.webidl
new file mode 100644
index 0000000000..9dbad85b64
--- /dev/null
+++ b/dom/webidl/WebAuthentication.webidl
@@ -0,0 +1,161 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/webauthn/
+ */
+
+/***** Interfaces to Data *****/
+
+[SecureContext, Pref="security.webauth.webauthn",
+ Exposed=Window]
+interface PublicKeyCredential : Credential {
+    [SameObject, Throws] readonly attribute ArrayBuffer      rawId;
+    [SameObject] readonly attribute AuthenticatorResponse    response;
+    AuthenticationExtensionsClientOutputs getClientExtensionResults();
+};
+
+[SecureContext]
+partial interface PublicKeyCredential {
+    [NewObject] static Promise<boolean> isUserVerifyingPlatformAuthenticatorAvailable();
+    // isExternalCTAP2SecurityKeySupported is non-standard; see Bug 1526023
+    [NewObject] static Promise<boolean> isExternalCTAP2SecurityKeySupported();
+};
+
+[SecureContext, Pref="security.webauth.webauthn",
+ Exposed=Window]
+interface AuthenticatorResponse {
+    [SameObject, Throws] readonly attribute ArrayBuffer clientDataJSON;
+};
+
+[SecureContext, Pref="security.webauth.webauthn",
+ Exposed=Window]
+interface AuthenticatorAttestationResponse : AuthenticatorResponse {
+    [SameObject, Throws] readonly attribute ArrayBuffer attestationObject;
+};
+
+[SecureContext, Pref="security.webauth.webauthn",
+ Exposed=Window]
+interface AuthenticatorAssertionResponse : AuthenticatorResponse {
+    [SameObject, Throws] readonly attribute ArrayBuffer      authenticatorData;
+    [SameObject, Throws] readonly attribute ArrayBuffer      signature;
+    [SameObject, Throws] readonly attribute ArrayBuffer?     userHandle;
+};
+
+dictionary PublicKeyCredentialParameters {
+    required DOMString                type;
+    required COSEAlgorithmIdentifier  alg;
+};
+
+dictionary PublicKeyCredentialCreationOptions {
+    required PublicKeyCredentialRpEntity   rp;
+    required PublicKeyCredentialUserEntity user;
+
+    required BufferSource                            challenge;
+    required sequence<PublicKeyCredentialParameters> pubKeyCredParams;
+
+    unsigned long                                timeout;
+    sequence<PublicKeyCredentialDescriptor>      excludeCredentials = [];
+    // FIXME: bug 1493860: should this "= {}" be here?
+    AuthenticatorSelectionCriteria               authenticatorSelection = {};
+    DOMString                                    attestation = "none";
+    // FIXME: bug 1493860: should this "= {}" be here?
+    AuthenticationExtensionsClientInputs         extensions = {};
+};
+
+dictionary PublicKeyCredentialEntity {
+    required DOMString    name;
+    USVString             icon;
+};
+
+dictionary PublicKeyCredentialRpEntity : PublicKeyCredentialEntity {
+    DOMString      id;
+};
+
+dictionary PublicKeyCredentialUserEntity : PublicKeyCredentialEntity {
+    required BufferSource   id;
+    required DOMString      displayName;
+};
+
+dictionary AuthenticatorSelectionCriteria {
+    DOMString                    authenticatorAttachment;
+    DOMString                    residentKey;
+    boolean                      requireResidentKey = false;
+    DOMString                    userVerification = "preferred";
+};
+
+dictionary PublicKeyCredentialRequestOptions {
+    required BufferSource                challenge;
+    unsigned long                        timeout;
+    USVString                            rpId;
+    sequence<PublicKeyCredentialDescriptor> allowCredentials = [];
+    DOMString                            userVerification = "preferred";
+    // FIXME: bug 1493860: should this "= {}" be here?
+    AuthenticationExtensionsClientInputs extensions = {};
+};
+
+// TODO - Use partial dictionaries when bug 1436329 is fixed.
+dictionary AuthenticationExtensionsClientInputs {
+    // FIDO AppID Extension (appid)
+    // <https://w3c.github.io/webauthn/#sctn-appid-extension>
+    USVString appid;
+
+    // hmac-secret
+    // <https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html#sctn-hmac-secret-extension>
+    boolean hmacCreateSecret;
+};
+
+// TODO - Use partial dictionaries when bug 1436329 is fixed.
+dictionary AuthenticationExtensionsClientOutputs {
+    // FIDO AppID Extension (appid)
+    // <https://w3c.github.io/webauthn/#sctn-appid-extension>
+    boolean appid;
+
+    // <https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html#sctn-hmac-secret-extension>
+    boolean hmacCreateSecret;
+};
+
+typedef record<DOMString, DOMString> AuthenticationExtensionsAuthenticatorInputs;
+
+[GenerateToJSON]
+dictionary CollectedClientData {
+    required DOMString           type;
+    required DOMString           challenge;
+    required DOMString           origin;
+    TokenBinding                 tokenBinding;
+};
+
+dictionary TokenBinding {
+    required DOMString status;
+    DOMString id;
+};
+
+dictionary PublicKeyCredentialDescriptor {
+    required DOMString                    type;
+    required BufferSource                 id;
+    // Transports is a string that is matched against the AuthenticatorTransport
+    // enumeration so that we have forward-compatibility for new transports.
+    sequence<DOMString>                   transports;
+};
+
+typedef long COSEAlgorithmIdentifier;
+
+typedef sequence<AAGUID>      AuthenticatorSelectionList;
+
+typedef BufferSource      AAGUID;
+
+/*
+// FIDO AppID Extension (appid)
+// <https://w3c.github.io/webauthn/#sctn-appid-extension>
+partial dictionary AuthenticationExtensionsClientInputs {
+    USVString appid;
+};
+
+// FIDO AppID Extension (appid)
+// <https://w3c.github.io/webauthn/#sctn-appid-extension>
+partial dictionary AuthenticationExtensionsClientOutputs {
+  boolean appid;
+};
+*/
diff --git a/dom/webidl/WebGL2RenderingContext.webidl b/dom/webidl/WebGL2RenderingContext.webidl
new file mode 100644
index 0000000000..e452326d70
--- /dev/null
+++ b/dom/webidl/WebGL2RenderingContext.webidl
@@ -0,0 +1,742 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The source for this IDL is found at https://www.khronos.org/registry/webgl/specs/latest/2.0
+ * This IDL depends on WebGLRenderingContext.webidl
+ */
+
+typedef long long GLint64;
+typedef unsigned long long GLuint64;
+
+[Pref="webgl.enable-webgl2",
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread",
+ Exposed=(Window,Worker)]
+interface WebGLSampler {
+};
+
+[Pref="webgl.enable-webgl2",
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread",
+ Exposed=(Window,Worker)]
+interface WebGLSync {
+};
+
+[Pref="webgl.enable-webgl2",
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread",
+ Exposed=(Window,Worker)]
+interface WebGLTransformFeedback {
+};
+
+typedef ([AllowShared] Uint32Array or sequence<GLuint>) Uint32List;
+
+// WebGL2 spec has this as an empty interface that pulls in everything
+// via WebGL2RenderingContextBase.
+[Pref="webgl.enable-webgl2",
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread",
+ Exposed=(Window,Worker)]
+interface WebGL2RenderingContext
+{
+};
+
+interface mixin WebGL2RenderingContextBase
+{
+    const GLenum READ_BUFFER                                   = 0x0C02;
+    const GLenum UNPACK_ROW_LENGTH                             = 0x0CF2;
+    const GLenum UNPACK_SKIP_ROWS                              = 0x0CF3;
+    const GLenum UNPACK_SKIP_PIXELS                            = 0x0CF4;
+    const GLenum PACK_ROW_LENGTH                               = 0x0D02;
+    const GLenum PACK_SKIP_ROWS                                = 0x0D03;
+    const GLenum PACK_SKIP_PIXELS                              = 0x0D04;
+    const GLenum COLOR                                         = 0x1800;
+    const GLenum DEPTH                                         = 0x1801;
+    const GLenum STENCIL                                       = 0x1802;
+    const GLenum RED                                           = 0x1903;
+    const GLenum RGB8                                          = 0x8051;
+    const GLenum RGBA8                                         = 0x8058;
+    const GLenum RGB10_A2                                      = 0x8059;
+    const GLenum TEXTURE_BINDING_3D                            = 0x806A;
+    const GLenum UNPACK_SKIP_IMAGES                            = 0x806D;
+    const GLenum UNPACK_IMAGE_HEIGHT                           = 0x806E;
+    const GLenum TEXTURE_3D                                    = 0x806F;
+    const GLenum TEXTURE_WRAP_R                                = 0x8072;
+    const GLenum MAX_3D_TEXTURE_SIZE                           = 0x8073;
+    const GLenum UNSIGNED_INT_2_10_10_10_REV                   = 0x8368;
+    const GLenum MAX_ELEMENTS_VERTICES                         = 0x80E8;
+    const GLenum MAX_ELEMENTS_INDICES                          = 0x80E9;
+    const GLenum TEXTURE_MIN_LOD                               = 0x813A;
+    const GLenum TEXTURE_MAX_LOD                               = 0x813B;
+    const GLenum TEXTURE_BASE_LEVEL                            = 0x813C;
+    const GLenum TEXTURE_MAX_LEVEL                             = 0x813D;
+    const GLenum MIN                                           = 0x8007;
+    const GLenum MAX                                           = 0x8008;
+    const GLenum DEPTH_COMPONENT24                             = 0x81A6;
+    const GLenum MAX_TEXTURE_LOD_BIAS                          = 0x84FD;
+    const GLenum TEXTURE_COMPARE_MODE                          = 0x884C;
+    const GLenum TEXTURE_COMPARE_FUNC                          = 0x884D;
+    const GLenum CURRENT_QUERY                                 = 0x8865;
+    const GLenum QUERY_RESULT                                  = 0x8866;
+    const GLenum QUERY_RESULT_AVAILABLE                        = 0x8867;
+    const GLenum STREAM_READ                                   = 0x88E1;
+    const GLenum STREAM_COPY                                   = 0x88E2;
+    const GLenum STATIC_READ                                   = 0x88E5;
+    const GLenum STATIC_COPY                                   = 0x88E6;
+    const GLenum DYNAMIC_READ                                  = 0x88E9;
+    const GLenum DYNAMIC_COPY                                  = 0x88EA;
+    const GLenum MAX_DRAW_BUFFERS                              = 0x8824;
+    const GLenum DRAW_BUFFER0                                  = 0x8825;
+    const GLenum DRAW_BUFFER1                                  = 0x8826;
+    const GLenum DRAW_BUFFER2                                  = 0x8827;
+    const GLenum DRAW_BUFFER3                                  = 0x8828;
+    const GLenum DRAW_BUFFER4                                  = 0x8829;
+    const GLenum DRAW_BUFFER5                                  = 0x882A;
+    const GLenum DRAW_BUFFER6                                  = 0x882B;
+    const GLenum DRAW_BUFFER7                                  = 0x882C;
+    const GLenum DRAW_BUFFER8                                  = 0x882D;
+    const GLenum DRAW_BUFFER9                                  = 0x882E;
+    const GLenum DRAW_BUFFER10                                 = 0x882F;
+    const GLenum DRAW_BUFFER11                                 = 0x8830;
+    const GLenum DRAW_BUFFER12                                 = 0x8831;
+    const GLenum DRAW_BUFFER13                                 = 0x8832;
+    const GLenum DRAW_BUFFER14                                 = 0x8833;
+    const GLenum DRAW_BUFFER15                                 = 0x8834;
+    const GLenum MAX_FRAGMENT_UNIFORM_COMPONENTS               = 0x8B49;
+    const GLenum MAX_VERTEX_UNIFORM_COMPONENTS                 = 0x8B4A;
+    const GLenum SAMPLER_3D                                    = 0x8B5F;
+    const GLenum SAMPLER_2D_SHADOW                             = 0x8B62;
+    const GLenum FRAGMENT_SHADER_DERIVATIVE_HINT               = 0x8B8B;
+    const GLenum PIXEL_PACK_BUFFER                             = 0x88EB;
+    const GLenum PIXEL_UNPACK_BUFFER                           = 0x88EC;
+    const GLenum PIXEL_PACK_BUFFER_BINDING                     = 0x88ED;
+    const GLenum PIXEL_UNPACK_BUFFER_BINDING                   = 0x88EF;
+    const GLenum FLOAT_MAT2x3                                  = 0x8B65;
+    const GLenum FLOAT_MAT2x4                                  = 0x8B66;
+    const GLenum FLOAT_MAT3x2                                  = 0x8B67;
+    const GLenum FLOAT_MAT3x4                                  = 0x8B68;
+    const GLenum FLOAT_MAT4x2                                  = 0x8B69;
+    const GLenum FLOAT_MAT4x3                                  = 0x8B6A;
+    const GLenum SRGB                                          = 0x8C40;
+    const GLenum SRGB8                                         = 0x8C41;
+    const GLenum SRGB8_ALPHA8                                  = 0x8C43;
+    const GLenum COMPARE_REF_TO_TEXTURE                        = 0x884E;
+    const GLenum RGBA32F                                       = 0x8814;
+    const GLenum RGB32F                                        = 0x8815;
+    const GLenum RGBA16F                                       = 0x881A;
+    const GLenum RGB16F                                        = 0x881B;
+    const GLenum VERTEX_ATTRIB_ARRAY_INTEGER                   = 0x88FD;
+    const GLenum MAX_ARRAY_TEXTURE_LAYERS                      = 0x88FF;
+    const GLenum MIN_PROGRAM_TEXEL_OFFSET                      = 0x8904;
+    const GLenum MAX_PROGRAM_TEXEL_OFFSET                      = 0x8905;
+    const GLenum MAX_VARYING_COMPONENTS                        = 0x8B4B;
+    const GLenum TEXTURE_2D_ARRAY                              = 0x8C1A;
+    const GLenum TEXTURE_BINDING_2D_ARRAY                      = 0x8C1D;
+    const GLenum R11F_G11F_B10F                                = 0x8C3A;
+    const GLenum UNSIGNED_INT_10F_11F_11F_REV                  = 0x8C3B;
+    const GLenum RGB9_E5                                       = 0x8C3D;
+    const GLenum UNSIGNED_INT_5_9_9_9_REV                      = 0x8C3E;
+    const GLenum TRANSFORM_FEEDBACK_BUFFER_MODE                = 0x8C7F;
+    const GLenum MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS    = 0x8C80;
+    const GLenum TRANSFORM_FEEDBACK_VARYINGS                   = 0x8C83;
+    const GLenum TRANSFORM_FEEDBACK_BUFFER_START               = 0x8C84;
+    const GLenum TRANSFORM_FEEDBACK_BUFFER_SIZE                = 0x8C85;
+    const GLenum TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN         = 0x8C88;
+    const GLenum RASTERIZER_DISCARD                            = 0x8C89;
+    const GLenum MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS = 0x8C8A;
+    const GLenum MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS       = 0x8C8B;
+    const GLenum INTERLEAVED_ATTRIBS                           = 0x8C8C;
+    const GLenum SEPARATE_ATTRIBS                              = 0x8C8D;
+    const GLenum TRANSFORM_FEEDBACK_BUFFER                     = 0x8C8E;
+    const GLenum TRANSFORM_FEEDBACK_BUFFER_BINDING             = 0x8C8F;
+    const GLenum RGBA32UI                                      = 0x8D70;
+    const GLenum RGB32UI                                       = 0x8D71;
+    const GLenum RGBA16UI                                      = 0x8D76;
+    const GLenum RGB16UI                                       = 0x8D77;
+    const GLenum RGBA8UI                                       = 0x8D7C;
+    const GLenum RGB8UI                                        = 0x8D7D;
+    const GLenum RGBA32I                                       = 0x8D82;
+    const GLenum RGB32I                                        = 0x8D83;
+    const GLenum RGBA16I                                       = 0x8D88;
+    const GLenum RGB16I                                        = 0x8D89;
+    const GLenum RGBA8I                                        = 0x8D8E;
+    const GLenum RGB8I                                         = 0x8D8F;
+    const GLenum RED_INTEGER                                   = 0x8D94;
+    const GLenum RGB_INTEGER                                   = 0x8D98;
+    const GLenum RGBA_INTEGER                                  = 0x8D99;
+    const GLenum SAMPLER_2D_ARRAY                              = 0x8DC1;
+    const GLenum SAMPLER_2D_ARRAY_SHADOW                       = 0x8DC4;
+    const GLenum SAMPLER_CUBE_SHADOW                           = 0x8DC5;
+    const GLenum UNSIGNED_INT_VEC2                             = 0x8DC6;
+    const GLenum UNSIGNED_INT_VEC3                             = 0x8DC7;
+    const GLenum UNSIGNED_INT_VEC4                             = 0x8DC8;
+    const GLenum INT_SAMPLER_2D                                = 0x8DCA;
+    const GLenum INT_SAMPLER_3D                                = 0x8DCB;
+    const GLenum INT_SAMPLER_CUBE                              = 0x8DCC;
+    const GLenum INT_SAMPLER_2D_ARRAY                          = 0x8DCF;
+    const GLenum UNSIGNED_INT_SAMPLER_2D                       = 0x8DD2;
+    const GLenum UNSIGNED_INT_SAMPLER_3D                       = 0x8DD3;
+    const GLenum UNSIGNED_INT_SAMPLER_CUBE                     = 0x8DD4;
+    const GLenum UNSIGNED_INT_SAMPLER_2D_ARRAY                 = 0x8DD7;
+    const GLenum DEPTH_COMPONENT32F                            = 0x8CAC;
+    const GLenum DEPTH32F_STENCIL8                             = 0x8CAD;
+    const GLenum FLOAT_32_UNSIGNED_INT_24_8_REV                = 0x8DAD;
+    const GLenum FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING         = 0x8210;
+    const GLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE         = 0x8211;
+    const GLenum FRAMEBUFFER_ATTACHMENT_RED_SIZE               = 0x8212;
+    const GLenum FRAMEBUFFER_ATTACHMENT_GREEN_SIZE             = 0x8213;
+    const GLenum FRAMEBUFFER_ATTACHMENT_BLUE_SIZE              = 0x8214;
+    const GLenum FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE             = 0x8215;
+    const GLenum FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE             = 0x8216;
+    const GLenum FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE           = 0x8217;
+    const GLenum FRAMEBUFFER_DEFAULT                           = 0x8218;
+    const GLenum UNSIGNED_INT_24_8                             = 0x84FA;
+    const GLenum DEPTH24_STENCIL8                              = 0x88F0;
+    const GLenum UNSIGNED_NORMALIZED                           = 0x8C17;
+    const GLenum DRAW_FRAMEBUFFER_BINDING                      = 0x8CA6; /* Same as FRAMEBUFFER_BINDING */
+    const GLenum READ_FRAMEBUFFER                              = 0x8CA8;
+    const GLenum DRAW_FRAMEBUFFER                              = 0x8CA9;
+    const GLenum READ_FRAMEBUFFER_BINDING                      = 0x8CAA;
+    const GLenum RENDERBUFFER_SAMPLES                          = 0x8CAB;
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER          = 0x8CD4;
+    const GLenum MAX_COLOR_ATTACHMENTS                         = 0x8CDF;
+    const GLenum COLOR_ATTACHMENT1                             = 0x8CE1;
+    const GLenum COLOR_ATTACHMENT2                             = 0x8CE2;
+    const GLenum COLOR_ATTACHMENT3                             = 0x8CE3;
+    const GLenum COLOR_ATTACHMENT4                             = 0x8CE4;
+    const GLenum COLOR_ATTACHMENT5                             = 0x8CE5;
+    const GLenum COLOR_ATTACHMENT6                             = 0x8CE6;
+    const GLenum COLOR_ATTACHMENT7                             = 0x8CE7;
+    const GLenum COLOR_ATTACHMENT8                             = 0x8CE8;
+    const GLenum COLOR_ATTACHMENT9                             = 0x8CE9;
+    const GLenum COLOR_ATTACHMENT10                            = 0x8CEA;
+    const GLenum COLOR_ATTACHMENT11                            = 0x8CEB;
+    const GLenum COLOR_ATTACHMENT12                            = 0x8CEC;
+    const GLenum COLOR_ATTACHMENT13                            = 0x8CED;
+    const GLenum COLOR_ATTACHMENT14                            = 0x8CEE;
+    const GLenum COLOR_ATTACHMENT15                            = 0x8CEF;
+    const GLenum FRAMEBUFFER_INCOMPLETE_MULTISAMPLE            = 0x8D56;
+    const GLenum MAX_SAMPLES                                   = 0x8D57;
+    const GLenum HALF_FLOAT                                    = 0x140B;
+    const GLenum RG                                            = 0x8227;
+    const GLenum RG_INTEGER                                    = 0x8228;
+    const GLenum R8                                            = 0x8229;
+    const GLenum RG8                                           = 0x822B;
+    const GLenum R16F                                          = 0x822D;
+    const GLenum R32F                                          = 0x822E;
+    const GLenum RG16F                                         = 0x822F;
+    const GLenum RG32F                                         = 0x8230;
+    const GLenum R8I                                           = 0x8231;
+    const GLenum R8UI                                          = 0x8232;
+    const GLenum R16I                                          = 0x8233;
+    const GLenum R16UI                                         = 0x8234;
+    const GLenum R32I                                          = 0x8235;
+    const GLenum R32UI                                         = 0x8236;
+    const GLenum RG8I                                          = 0x8237;
+    const GLenum RG8UI                                         = 0x8238;
+    const GLenum RG16I                                         = 0x8239;
+    const GLenum RG16UI                                        = 0x823A;
+    const GLenum RG32I                                         = 0x823B;
+    const GLenum RG32UI                                        = 0x823C;
+    const GLenum VERTEX_ARRAY_BINDING                          = 0x85B5;
+    const GLenum R8_SNORM                                      = 0x8F94;
+    const GLenum RG8_SNORM                                     = 0x8F95;
+    const GLenum RGB8_SNORM                                    = 0x8F96;
+    const GLenum RGBA8_SNORM                                   = 0x8F97;
+    const GLenum SIGNED_NORMALIZED                             = 0x8F9C;
+    const GLenum COPY_READ_BUFFER                              = 0x8F36;
+    const GLenum COPY_WRITE_BUFFER                             = 0x8F37;
+    const GLenum COPY_READ_BUFFER_BINDING                      = 0x8F36; /* Same as COPY_READ_BUFFER */
+    const GLenum COPY_WRITE_BUFFER_BINDING                     = 0x8F37; /* Same as COPY_WRITE_BUFFER */
+    const GLenum UNIFORM_BUFFER                                = 0x8A11;
+    const GLenum UNIFORM_BUFFER_BINDING                        = 0x8A28;
+    const GLenum UNIFORM_BUFFER_START                          = 0x8A29;
+    const GLenum UNIFORM_BUFFER_SIZE                           = 0x8A2A;
+    const GLenum MAX_VERTEX_UNIFORM_BLOCKS                     = 0x8A2B;
+    const GLenum MAX_FRAGMENT_UNIFORM_BLOCKS                   = 0x8A2D;
+    const GLenum MAX_COMBINED_UNIFORM_BLOCKS                   = 0x8A2E;
+    const GLenum MAX_UNIFORM_BUFFER_BINDINGS                   = 0x8A2F;
+    const GLenum MAX_UNIFORM_BLOCK_SIZE                        = 0x8A30;
+    const GLenum MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS        = 0x8A31;
+    const GLenum MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS      = 0x8A33;
+    const GLenum UNIFORM_BUFFER_OFFSET_ALIGNMENT               = 0x8A34;
+    const GLenum ACTIVE_UNIFORM_BLOCKS                         = 0x8A36;
+    const GLenum UNIFORM_TYPE                                  = 0x8A37;
+    const GLenum UNIFORM_SIZE                                  = 0x8A38;
+    const GLenum UNIFORM_BLOCK_INDEX                           = 0x8A3A;
+    const GLenum UNIFORM_OFFSET                                = 0x8A3B;
+    const GLenum UNIFORM_ARRAY_STRIDE                          = 0x8A3C;
+    const GLenum UNIFORM_MATRIX_STRIDE                         = 0x8A3D;
+    const GLenum UNIFORM_IS_ROW_MAJOR                          = 0x8A3E;
+    const GLenum UNIFORM_BLOCK_BINDING                         = 0x8A3F;
+    const GLenum UNIFORM_BLOCK_DATA_SIZE                       = 0x8A40;
+    const GLenum UNIFORM_BLOCK_ACTIVE_UNIFORMS                 = 0x8A42;
+    const GLenum UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES          = 0x8A43;
+    const GLenum UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER     = 0x8A44;
+    const GLenum UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER   = 0x8A46;
+    const GLenum INVALID_INDEX                                 = 0xFFFFFFFF;
+    const GLenum MAX_VERTEX_OUTPUT_COMPONENTS                  = 0x9122;
+    const GLenum MAX_FRAGMENT_INPUT_COMPONENTS                 = 0x9125;
+    const GLenum MAX_SERVER_WAIT_TIMEOUT                       = 0x9111;
+    const GLenum OBJECT_TYPE                                   = 0x9112;
+    const GLenum SYNC_CONDITION                                = 0x9113;
+    const GLenum SYNC_STATUS                                   = 0x9114;
+    const GLenum SYNC_FLAGS                                    = 0x9115;
+    const GLenum SYNC_FENCE                                    = 0x9116;
+    const GLenum SYNC_GPU_COMMANDS_COMPLETE                    = 0x9117;
+    const GLenum UNSIGNALED                                    = 0x9118;
+    const GLenum SIGNALED                                      = 0x9119;
+    const GLenum ALREADY_SIGNALED                              = 0x911A;
+    const GLenum TIMEOUT_EXPIRED                               = 0x911B;
+    const GLenum CONDITION_SATISFIED                           = 0x911C;
+    const GLenum WAIT_FAILED                                   = 0x911D;
+    const GLenum SYNC_FLUSH_COMMANDS_BIT                       = 0x00000001;
+    const GLenum VERTEX_ATTRIB_ARRAY_DIVISOR                   = 0x88FE;
+    const GLenum ANY_SAMPLES_PASSED                            = 0x8C2F;
+    const GLenum ANY_SAMPLES_PASSED_CONSERVATIVE               = 0x8D6A;
+    const GLenum SAMPLER_BINDING                               = 0x8919;
+    const GLenum RGB10_A2UI                                    = 0x906F;
+    const GLenum INT_2_10_10_10_REV                            = 0x8D9F;
+    const GLenum TRANSFORM_FEEDBACK                            = 0x8E22;
+    const GLenum TRANSFORM_FEEDBACK_PAUSED                     = 0x8E23;
+    const GLenum TRANSFORM_FEEDBACK_ACTIVE                     = 0x8E24;
+    const GLenum TRANSFORM_FEEDBACK_BINDING                    = 0x8E25;
+    const GLenum TEXTURE_IMMUTABLE_FORMAT                      = 0x912F;
+    const GLenum MAX_ELEMENT_INDEX                             = 0x8D6B;
+    const GLenum TEXTURE_IMMUTABLE_LEVELS                      = 0x82DF;
+
+    const GLint64 TIMEOUT_IGNORED                              = -1;
+
+    /* WebGL-specific enums */
+    const GLenum MAX_CLIENT_WAIT_TIMEOUT_WEBGL                 = 0x9247;
+
+    /* Buffer objects */
+    // WebGL1:
+    undefined bufferData(GLenum target, GLsizeiptr size, GLenum usage);
+    undefined bufferData(GLenum target, [AllowShared] ArrayBuffer? srcData, GLenum usage);
+    undefined bufferData(GLenum target, [AllowShared] ArrayBufferView srcData, GLenum usage);
+    undefined bufferSubData(GLenum target, GLintptr offset, [AllowShared] ArrayBuffer srcData);
+    undefined bufferSubData(GLenum target, GLintptr offset, [AllowShared] ArrayBufferView srcData);
+    // WebGL2:
+    undefined bufferData(GLenum target, [AllowShared] ArrayBufferView srcData, GLenum usage,
+                         GLuint srcOffset, optional GLuint length = 0);
+    undefined bufferSubData(GLenum target, GLintptr dstByteOffset, [AllowShared] ArrayBufferView srcData,
+                            GLuint srcOffset, optional GLuint length = 0);
+
+    undefined copyBufferSubData(GLenum readTarget, GLenum writeTarget, GLintptr readOffset,
+                                GLintptr writeOffset, GLsizeiptr size);
+    // MapBufferRange, in particular its read-only and write-only modes,
+    // can not be exposed safely to JavaScript. GetBufferSubData
+    // replaces it for the purpose of fetching data back from the GPU.
+    undefined getBufferSubData(GLenum target, GLintptr srcByteOffset, [AllowShared] ArrayBufferView dstData,
+                               optional GLuint dstOffset = 0, optional GLuint length = 0);
+
+    /* Framebuffer objects */
+    undefined blitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0,
+                              GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);
+    undefined framebufferTextureLayer(GLenum target, GLenum attachment, WebGLTexture? texture, GLint level,
+                                      GLint layer);
+
+    [Throws]
+    undefined invalidateFramebuffer(GLenum target, sequence<GLenum> attachments);
+
+    [Throws]
+    undefined invalidateSubFramebuffer(GLenum target, sequence<GLenum> attachments,
+                                       GLint x, GLint y, GLsizei width, GLsizei height);
+
+    undefined readBuffer(GLenum src);
+
+    /* Renderbuffer objects */
+    [Throws]
+    any getInternalformatParameter(GLenum target, GLenum internalformat, GLenum pname);
+    undefined renderbufferStorageMultisample(GLenum target, GLsizei samples, GLenum internalformat,
+                                             GLsizei width, GLsizei height);
+
+    /* Texture objects */
+    undefined texStorage2D(GLenum target, GLsizei levels, GLenum internalformat, GLsizei width,
+                           GLsizei height);
+    undefined texStorage3D(GLenum target, GLsizei levels, GLenum internalformat, GLsizei width,
+                           GLsizei height, GLsizei depth);
+
+    // WebGL1 legacy entrypoints:
+    [Throws] // Another overhead throws.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLsizei width, GLsizei height, GLint border, GLenum format,
+                         GLenum type, [AllowShared] ArrayBufferView? pixels);
+    [Throws]
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, HTMLImageElement source); // May throw DOMException
+    [Throws]
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, ImageBitmap source);
+    [Throws] // Another overhead throws.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, ImageData source);
+    [Throws] // Another overhead throws.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, OffscreenCanvas source);
+
+    [Throws] // Another overhead throws.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLsizei width, GLsizei height,
+                            GLenum format, GLenum type, [AllowShared] ArrayBufferView? pixels);
+    [Throws]
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, HTMLImageElement source); // May throw DOMException
+    [Throws]
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, ImageBitmap source);
+    [Throws] // Another overhead throws.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, ImageData source);
+    [Throws] // Another overhead throws.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, OffscreenCanvas source);
+
+    // WebGL2 entrypoints:
+    [Throws] // Another overhead throws.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLint border, GLenum format, GLenum type, GLintptr pboOffset);
+    [Throws]
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLint border, GLenum format, GLenum type,
+                         HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLint border, GLenum format, GLenum type,
+                         HTMLImageElement source); // May throw DOMException
+    [Throws]
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLint border, GLenum format, GLenum type,
+                         HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLint border, GLenum format, GLenum type,
+                         ImageBitmap source);
+    [Throws] // Another overhead throws.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLint border, GLenum format, GLenum type,
+                         ImageData source);
+    [Throws] // Another overhead throws.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLint border, GLenum format, GLenum type,
+                         OffscreenCanvas source);
+    [Throws] // Another overhead throws.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLint border, GLenum format, GLenum type, [AllowShared] ArrayBufferView srcData,
+                         GLuint srcOffset);
+
+    [Throws] // Another overhead throws.
+    undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLsizei depth, GLint border, GLenum format, GLenum type, GLintptr pboOffset);
+    [Throws]
+    undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLsizei depth, GLint border, GLenum format, GLenum type,
+                         HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLsizei depth, GLint border, GLenum format, GLenum type,
+                         HTMLImageElement source); // May throw DOMException
+    [Throws]
+    undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLsizei depth, GLint border, GLenum format, GLenum type,
+                         HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLsizei depth, GLint border, GLenum format, GLenum type,
+                         ImageBitmap source);
+    [Throws] // Another overhead throws.
+    undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLsizei depth, GLint border, GLenum format, GLenum type,
+                         ImageData source);
+    [Throws] // Another overhead throws.
+    undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLsizei depth, GLint border, GLenum format, GLenum type,
+                         OffscreenCanvas source);
+    [Throws] // Another overhead throws.
+    undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLsizei depth, GLint border, GLenum format, GLenum type, [AllowShared] ArrayBufferView? srcData);
+    [Throws] // Another overhead throws.
+    undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                         GLsizei depth, GLint border, GLenum format, GLenum type, [AllowShared] ArrayBufferView srcData,
+                         GLuint srcOffset);
+
+    [Throws] // Another overhead throws.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                            GLsizei height, GLenum format, GLenum type, GLintptr pboOffset);
+    [Throws]
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                            GLsizei height, GLenum format, GLenum type,
+                            HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                            GLsizei height, GLenum format, GLenum type,
+                            HTMLImageElement source); // May throw DOMException
+    [Throws]
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                            GLsizei height, GLenum format, GLenum type,
+                            HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                            GLsizei height, GLenum format, GLenum type,
+                            ImageBitmap source);
+    [Throws] // Another overhead throws.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                            GLsizei height, GLenum format, GLenum type,
+                            ImageData source);
+    [Throws] // Another overhead throws.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                            GLsizei height, GLenum format, GLenum type,
+                            OffscreenCanvas source);
+    [Throws] // Another overhead throws.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                            GLsizei height, GLenum format, GLenum type, [AllowShared] ArrayBufferView srcData,
+                            GLuint srcOffset);
+
+    [Throws] // Another overhead throws.
+    undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                            GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                            GLintptr pboOffset);
+    [Throws]
+    undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                            GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                            HTMLCanvasElement source); // May throw DOMException
+    [Throws]
+    undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                            GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                            HTMLImageElement source); // May throw DOMException
+    [Throws]
+    undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                            GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                            HTMLVideoElement source); // May throw DOMException
+    [Throws] // Another overhead throws.
+    undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                            GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                            ImageBitmap source);
+    [Throws] // Another overhead throws.
+    undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                            GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                            ImageData source);
+    [Throws] // Another overhead throws.
+    undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                            GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                            OffscreenCanvas source);
+    [Throws] // Another overhead throws.
+    undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                            GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                            [AllowShared] ArrayBufferView? srcData, optional GLuint srcOffset = 0);
+
+    undefined copyTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                                GLint x, GLint y, GLsizei width, GLsizei height);
+
+    undefined compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                                   GLsizei height, GLint border, GLsizei imageSize,  GLintptr offset);
+    undefined compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                                   GLsizei height, GLint border, [AllowShared] ArrayBufferView srcData,
+                                   optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);
+
+    undefined compressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                                   GLsizei height, GLsizei depth, GLint border, GLsizei imageSize, GLintptr offset);
+    undefined compressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                                   GLsizei height, GLsizei depth, GLint border, [AllowShared] ArrayBufferView srcData,
+                                   optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);
+
+    undefined compressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                      GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, GLintptr offset);
+    undefined compressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                      GLsizei width, GLsizei height, GLenum format,
+                                      [AllowShared] ArrayBufferView srcData,
+                                      optional GLuint srcOffset = 0,
+                                      optional GLuint srcLengthOverride = 0);
+
+    undefined compressedTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                      GLint zoffset, GLsizei width, GLsizei height, GLsizei depth,
+                                      GLenum format, GLsizei imageSize, GLintptr offset);
+    undefined compressedTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                      GLint zoffset, GLsizei width, GLsizei height, GLsizei depth,
+                                      GLenum format, [AllowShared] ArrayBufferView srcData,
+                                      optional GLuint srcOffset = 0,
+                                      optional GLuint srcLengthOverride = 0);
+
+    /* Programs and shaders */
+    [WebGLHandlesContextLoss] GLint getFragDataLocation(WebGLProgram program, DOMString name);
+
+    /* Uniforms */
+    undefined uniform1ui(WebGLUniformLocation? location, GLuint v0);
+    undefined uniform2ui(WebGLUniformLocation? location, GLuint v0, GLuint v1);
+    undefined uniform3ui(WebGLUniformLocation? location, GLuint v0, GLuint v1, GLuint v2);
+    undefined uniform4ui(WebGLUniformLocation? location, GLuint v0, GLuint v1, GLuint v2, GLuint v3);
+
+    undefined uniform1fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                         optional GLuint srcLength = 0);
+    undefined uniform2fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                         optional GLuint srcLength = 0);
+    undefined uniform3fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                         optional GLuint srcLength = 0);
+    undefined uniform4fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                         optional GLuint srcLength = 0);
+
+    undefined uniform1iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                         optional GLuint srcLength = 0);
+    undefined uniform2iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                         optional GLuint srcLength = 0);
+    undefined uniform3iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                         optional GLuint srcLength = 0);
+    undefined uniform4iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                         optional GLuint srcLength = 0);
+
+    undefined uniform1uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                          optional GLuint srcLength = 0);
+    undefined uniform2uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                          optional GLuint srcLength = 0);
+    undefined uniform3uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                          optional GLuint srcLength = 0);
+    undefined uniform4uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                          optional GLuint srcLength = 0);
+
+    undefined uniformMatrix2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    undefined uniformMatrix3x2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                                 optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    undefined uniformMatrix4x2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                                 optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+
+    undefined uniformMatrix2x3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                                 optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    undefined uniformMatrix3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    undefined uniformMatrix4x3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                                 optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+
+    undefined uniformMatrix2x4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                                 optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    undefined uniformMatrix3x4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                                 optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+    undefined uniformMatrix4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+
+    /* Vertex attribs */
+    undefined vertexAttribI4i(GLuint index, GLint x, GLint y, GLint z, GLint w);
+    undefined vertexAttribI4iv(GLuint index, Int32List values);
+    undefined vertexAttribI4ui(GLuint index, GLuint x, GLuint y, GLuint z, GLuint w);
+    undefined vertexAttribI4uiv(GLuint index, Uint32List values);
+    undefined vertexAttribIPointer(GLuint index, GLint size, GLenum type, GLsizei stride, GLintptr offset);
+
+    /* Writing to the drawing buffer */
+    undefined vertexAttribDivisor(GLuint index, GLuint divisor);
+    undefined drawArraysInstanced(GLenum mode, GLint first, GLsizei count, GLsizei instanceCount);
+    undefined drawElementsInstanced(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei instanceCount);
+    undefined drawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, GLintptr offset);
+
+    /* Reading back pixels */
+    // WebGL1:
+    [Throws, NeedsCallerType] // Throws on readback in a write-only context.
+    undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
+                         [AllowShared] ArrayBufferView? dstData);
+    // WebGL2:
+    [Throws, NeedsCallerType] // Throws on readback in a write-only context.
+    undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
+                         GLintptr offset);
+    [Throws, NeedsCallerType] // Throws on readback in a write-only context.
+    undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
+                         [AllowShared] ArrayBufferView dstData, GLuint dstOffset);
+
+    /* Multiple Render Targets */
+    undefined drawBuffers(sequence<GLenum> buffers);
+
+    undefined clearBufferfv(GLenum buffer, GLint drawbuffer, Float32List values,
+                            optional GLuint srcOffset = 0);
+    undefined clearBufferiv(GLenum buffer, GLint drawbuffer, Int32List values,
+                            optional GLuint srcOffset = 0);
+    undefined clearBufferuiv(GLenum buffer, GLint drawbuffer, Uint32List values,
+                             optional GLuint srcOffset = 0);
+
+    undefined clearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil);
+
+    /* Query Objects */
+    WebGLQuery? createQuery();
+    undefined deleteQuery(WebGLQuery? query);
+    [WebGLHandlesContextLoss] GLboolean isQuery(WebGLQuery? query);
+    undefined beginQuery(GLenum target, WebGLQuery query);
+    undefined endQuery(GLenum target);
+    any getQuery(GLenum target, GLenum pname);
+    any getQueryParameter(WebGLQuery query, GLenum pname);
+
+    /* Sampler Objects */
+    WebGLSampler? createSampler();
+    undefined deleteSampler(WebGLSampler? sampler);
+    [WebGLHandlesContextLoss] GLboolean isSampler(WebGLSampler? sampler);
+    undefined bindSampler(GLuint unit, WebGLSampler? sampler);
+    undefined samplerParameteri(WebGLSampler sampler, GLenum pname, GLint param);
+    undefined samplerParameterf(WebGLSampler sampler, GLenum pname, GLfloat param);
+    any getSamplerParameter(WebGLSampler sampler, GLenum pname);
+
+    /* Sync objects */
+    WebGLSync? fenceSync(GLenum condition, GLbitfield flags);
+    [WebGLHandlesContextLoss] GLboolean isSync(WebGLSync? sync);
+    undefined deleteSync(WebGLSync? sync);
+    GLenum clientWaitSync(WebGLSync sync, GLbitfield flags, GLuint64 timeout);
+    undefined waitSync(WebGLSync sync, GLbitfield flags, GLint64 timeout);
+    any getSyncParameter(WebGLSync sync, GLenum pname);
+
+    /* Transform Feedback */
+    WebGLTransformFeedback? createTransformFeedback();
+    undefined deleteTransformFeedback(WebGLTransformFeedback? tf);
+    [WebGLHandlesContextLoss] GLboolean isTransformFeedback(WebGLTransformFeedback? tf);
+    undefined bindTransformFeedback(GLenum target, WebGLTransformFeedback? tf);
+    undefined beginTransformFeedback(GLenum primitiveMode);
+    undefined endTransformFeedback();
+    undefined transformFeedbackVaryings(WebGLProgram program, sequence<DOMString> varyings, GLenum bufferMode);
+    [NewObject]
+    WebGLActiveInfo? getTransformFeedbackVarying(WebGLProgram program, GLuint index);
+    undefined pauseTransformFeedback();
+    undefined resumeTransformFeedback();
+
+    /* Uniform Buffer Objects and Transform Feedback Buffers */
+    undefined bindBufferBase(GLenum target, GLuint index, WebGLBuffer? buffer);
+    undefined bindBufferRange(GLenum target, GLuint index, WebGLBuffer? buffer, GLintptr offset, GLsizeiptr size);
+    [Throws] // GetOrCreateDOMReflector can fail.
+    any getIndexedParameter(GLenum target, GLuint index);
+    sequence<GLuint>? getUniformIndices(WebGLProgram program, sequence<DOMString> uniformNames);
+    any getActiveUniforms(WebGLProgram program, sequence<GLuint> uniformIndices, GLenum pname);
+    GLuint getUniformBlockIndex(WebGLProgram program, DOMString uniformBlockName);
+    [Throws] // Creating a Uint32Array can fail.
+    any getActiveUniformBlockParameter(WebGLProgram program, GLuint uniformBlockIndex, GLenum pname);
+    DOMString? getActiveUniformBlockName(WebGLProgram program, GLuint uniformBlockIndex);
+    undefined uniformBlockBinding(WebGLProgram program, GLuint uniformBlockIndex, GLuint uniformBlockBinding);
+
+    /* Vertex Array Objects */
+    WebGLVertexArrayObject? createVertexArray();
+    undefined deleteVertexArray(WebGLVertexArrayObject? vertexArray);
+    [WebGLHandlesContextLoss] GLboolean isVertexArray(WebGLVertexArrayObject? vertexArray);
+    undefined bindVertexArray(WebGLVertexArrayObject? array);
+};
+
+WebGL2RenderingContext includes WebGLRenderingContextBase;
+WebGL2RenderingContext includes WebGL2RenderingContextBase;
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_color_buffer_float {
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface OVR_multiview2 {
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_NUM_VIEWS_OVR = 0x9630;
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_BASE_VIEW_INDEX_OVR = 0x9632;
+    const GLenum MAX_VIEWS_OVR = 0x9631;
+    const GLenum FRAMEBUFFER_INCOMPLETE_VIEW_TARGETS_OVR = 0x9633;
+
+    undefined framebufferTextureMultiviewOVR(GLenum target, GLenum attachment, WebGLTexture? texture, GLint level, GLint baseViewIndex, GLsizei numViews);
+};
diff --git a/dom/webidl/WebGLContextEvent.webidl b/dom/webidl/WebGLContextEvent.webidl
new file mode 100644
index 0000000000..02fd9b4fa1
--- /dev/null
+++ b/dom/webidl/WebGLContextEvent.webidl
@@ -0,0 +1,21 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+
+ * The origin of this IDL file is
+ * https://www.khronos.org/registry/webgl/specs/latest/1.0/#fire-a-webgl-context-event
+ */
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLContextEvent : Event {
+  constructor(DOMString type, optional WebGLContextEventInit eventInit = {});
+
+  readonly attribute DOMString statusMessage;
+};
+
+// EventInit is defined in the DOM4 specification.
+dictionary WebGLContextEventInit : EventInit {
+  DOMString statusMessage = "";
+};
diff --git a/dom/webidl/WebGLRenderingContext.webidl b/dom/webidl/WebGLRenderingContext.webidl
new file mode 100644
index 0000000000..dd3ddcc263
--- /dev/null
+++ b/dom/webidl/WebGLRenderingContext.webidl
@@ -0,0 +1,1231 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://www.khronos.org/registry/webgl/specs/latest/webgl.idl
+ *
+ * Copyright © 2012 Khronos Group
+ */
+
+// WebGL IDL definitions scraped from the Khronos specification:
+// https://www.khronos.org/registry/webgl/specs/latest/
+//
+// This IDL depends on the typed array specification defined at:
+// https://www.khronos.org/registry/typedarray/specs/latest/typedarrays.idl
+
+typedef unsigned long  GLenum;
+typedef boolean        GLboolean;
+typedef unsigned long  GLbitfield;
+typedef byte           GLbyte;         /* 'byte' should be a signed 8 bit type. */
+typedef short          GLshort;
+typedef long           GLint;
+typedef long           GLsizei;
+typedef long long      GLintptr;
+typedef long long      GLsizeiptr;
+// Ideally the typedef below would use 'unsigned byte', but that doesn't currently exist in Web IDL.
+typedef octet          GLubyte;        /* 'octet' should be an unsigned 8 bit type. */
+typedef unsigned short GLushort;
+typedef unsigned long  GLuint;
+typedef unrestricted float GLfloat;
+typedef unrestricted float GLclampf;
+typedef unsigned long long GLuint64EXT;
+
+// The power preference settings are documented in the WebGLContextAttributes
+// section of the specification.
+enum WebGLPowerPreference { "default", "low-power", "high-performance" };
+enum PredefinedColorSpace { "srgb", "display-p3" };
+
+[GenerateInit]
+dictionary WebGLContextAttributes {
+    // We deviate from the spec for alpha and antialias:
+    // * alpha: Historically, we might use rgb565 instead of rgb(x)8, for
+    //          memory bandwidth optimization.
+    // * antialias: On Android, DPI is high and mem-bandwidth is low, so we
+    //              default to antialias:false if it's not set.
+    GLboolean alpha; // = true; // Default is controlled by webgl.default-no-alpha.
+    GLboolean depth = true;
+    GLboolean stencil = false;
+    GLboolean antialias; // = true; // Default is controlled by webgl.default-antialias.
+    GLboolean premultipliedAlpha = true;
+    GLboolean preserveDrawingBuffer = false;
+    GLboolean failIfMajorPerformanceCaveat = false;
+    WebGLPowerPreference powerPreference = "default";
+
+    // We are experimenting here, though this should be close to where we end up.
+    [Pref="webgl.colorspaces.prototype"]
+    PredefinedColorSpace colorSpace; // = "srgb"; Default is gfx::ColorSpace2::UNKNOWN for now.
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLBuffer {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLFramebuffer {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLProgram {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLRenderbuffer {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLShader {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLTexture {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLUniformLocation {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLVertexArrayObject {
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLActiveInfo {
+    readonly attribute GLint size;
+    readonly attribute GLenum type;
+    readonly attribute DOMString name;
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLShaderPrecisionFormat {
+    readonly attribute GLint rangeMin;
+    readonly attribute GLint rangeMax;
+    readonly attribute GLint precision;
+};
+
+typedef ([AllowShared] Float32Array or sequence<GLfloat>) Float32List;
+typedef ([AllowShared] Int32Array or sequence<GLint>) Int32List;
+
+// Shared mixin for the things that WebGLRenderingContext and
+// WebGL2RenderingContext have in common.  This doesn't have all the things they
+// have in common, because we don't support splitting multiple overloads of the
+// same method across separate interfaces and pulling them in with "includes".
+[Exposed=(Window, Worker)]
+interface mixin WebGLRenderingContextBase {
+    /* ClearBufferMask */
+    const GLenum DEPTH_BUFFER_BIT               = 0x00000100;
+    const GLenum STENCIL_BUFFER_BIT             = 0x00000400;
+    const GLenum COLOR_BUFFER_BIT               = 0x00004000;
+
+    /* BeginMode */
+    const GLenum POINTS                         = 0x0000;
+    const GLenum LINES                          = 0x0001;
+    const GLenum LINE_LOOP                      = 0x0002;
+    const GLenum LINE_STRIP                     = 0x0003;
+    const GLenum TRIANGLES                      = 0x0004;
+    const GLenum TRIANGLE_STRIP                 = 0x0005;
+    const GLenum TRIANGLE_FAN                   = 0x0006;
+
+    /* AlphaFunction (not supported in ES20) */
+    /*      NEVER */
+    /*      LESS */
+    /*      EQUAL */
+    /*      LEQUAL */
+    /*      GREATER */
+    /*      NOTEQUAL */
+    /*      GEQUAL */
+    /*      ALWAYS */
+
+    /* BlendingFactorDest */
+    const GLenum ZERO                           = 0;
+    const GLenum ONE                            = 1;
+    const GLenum SRC_COLOR                      = 0x0300;
+    const GLenum ONE_MINUS_SRC_COLOR            = 0x0301;
+    const GLenum SRC_ALPHA                      = 0x0302;
+    const GLenum ONE_MINUS_SRC_ALPHA            = 0x0303;
+    const GLenum DST_ALPHA                      = 0x0304;
+    const GLenum ONE_MINUS_DST_ALPHA            = 0x0305;
+
+    /* BlendingFactorSrc */
+    /*      ZERO */
+    /*      ONE */
+    const GLenum DST_COLOR                      = 0x0306;
+    const GLenum ONE_MINUS_DST_COLOR            = 0x0307;
+    const GLenum SRC_ALPHA_SATURATE             = 0x0308;
+    /*      SRC_ALPHA */
+    /*      ONE_MINUS_SRC_ALPHA */
+    /*      DST_ALPHA */
+    /*      ONE_MINUS_DST_ALPHA */
+
+    /* BlendEquationSeparate */
+    const GLenum FUNC_ADD                       = 0x8006;
+    const GLenum BLEND_EQUATION                 = 0x8009;
+    const GLenum BLEND_EQUATION_RGB             = 0x8009;   /* same as BLEND_EQUATION */
+    const GLenum BLEND_EQUATION_ALPHA           = 0x883D;
+
+    /* BlendSubtract */
+    const GLenum FUNC_SUBTRACT                  = 0x800A;
+    const GLenum FUNC_REVERSE_SUBTRACT          = 0x800B;
+
+    /* Separate Blend Functions */
+    const GLenum BLEND_DST_RGB                  = 0x80C8;
+    const GLenum BLEND_SRC_RGB                  = 0x80C9;
+    const GLenum BLEND_DST_ALPHA                = 0x80CA;
+    const GLenum BLEND_SRC_ALPHA                = 0x80CB;
+    const GLenum CONSTANT_COLOR                 = 0x8001;
+    const GLenum ONE_MINUS_CONSTANT_COLOR       = 0x8002;
+    const GLenum CONSTANT_ALPHA                 = 0x8003;
+    const GLenum ONE_MINUS_CONSTANT_ALPHA       = 0x8004;
+    const GLenum BLEND_COLOR                    = 0x8005;
+
+    /* Buffer Objects */
+    const GLenum ARRAY_BUFFER                   = 0x8892;
+    const GLenum ELEMENT_ARRAY_BUFFER           = 0x8893;
+    const GLenum ARRAY_BUFFER_BINDING           = 0x8894;
+    const GLenum ELEMENT_ARRAY_BUFFER_BINDING   = 0x8895;
+
+    const GLenum STREAM_DRAW                    = 0x88E0;
+    const GLenum STATIC_DRAW                    = 0x88E4;
+    const GLenum DYNAMIC_DRAW                   = 0x88E8;
+
+    const GLenum BUFFER_SIZE                    = 0x8764;
+    const GLenum BUFFER_USAGE                   = 0x8765;
+
+    const GLenum CURRENT_VERTEX_ATTRIB          = 0x8626;
+
+    /* CullFaceMode */
+    const GLenum FRONT                          = 0x0404;
+    const GLenum BACK                           = 0x0405;
+    const GLenum FRONT_AND_BACK                 = 0x0408;
+
+    /* DepthFunction */
+    /*      NEVER */
+    /*      LESS */
+    /*      EQUAL */
+    /*      LEQUAL */
+    /*      GREATER */
+    /*      NOTEQUAL */
+    /*      GEQUAL */
+    /*      ALWAYS */
+
+    /* EnableCap */
+    /* TEXTURE_2D */
+    const GLenum CULL_FACE                      = 0x0B44;
+    const GLenum BLEND                          = 0x0BE2;
+    const GLenum DITHER                         = 0x0BD0;
+    const GLenum STENCIL_TEST                   = 0x0B90;
+    const GLenum DEPTH_TEST                     = 0x0B71;
+    const GLenum SCISSOR_TEST                   = 0x0C11;
+    const GLenum POLYGON_OFFSET_FILL            = 0x8037;
+    const GLenum SAMPLE_ALPHA_TO_COVERAGE       = 0x809E;
+    const GLenum SAMPLE_COVERAGE                = 0x80A0;
+
+    /* ErrorCode */
+    const GLenum NO_ERROR                       = 0;
+    const GLenum INVALID_ENUM                   = 0x0500;
+    const GLenum INVALID_VALUE                  = 0x0501;
+    const GLenum INVALID_OPERATION              = 0x0502;
+    const GLenum OUT_OF_MEMORY                  = 0x0505;
+
+    /* FrontFaceDirection */
+    const GLenum CW                             = 0x0900;
+    const GLenum CCW                            = 0x0901;
+
+    /* GetPName */
+    const GLenum LINE_WIDTH                     = 0x0B21;
+    const GLenum ALIASED_POINT_SIZE_RANGE       = 0x846D;
+    const GLenum ALIASED_LINE_WIDTH_RANGE       = 0x846E;
+    const GLenum CULL_FACE_MODE                 = 0x0B45;
+    const GLenum FRONT_FACE                     = 0x0B46;
+    const GLenum DEPTH_RANGE                    = 0x0B70;
+    const GLenum DEPTH_WRITEMASK                = 0x0B72;
+    const GLenum DEPTH_CLEAR_VALUE              = 0x0B73;
+    const GLenum DEPTH_FUNC                     = 0x0B74;
+    const GLenum STENCIL_CLEAR_VALUE            = 0x0B91;
+    const GLenum STENCIL_FUNC                   = 0x0B92;
+    const GLenum STENCIL_FAIL                   = 0x0B94;
+    const GLenum STENCIL_PASS_DEPTH_FAIL        = 0x0B95;
+    const GLenum STENCIL_PASS_DEPTH_PASS        = 0x0B96;
+    const GLenum STENCIL_REF                    = 0x0B97;
+    const GLenum STENCIL_VALUE_MASK             = 0x0B93;
+    const GLenum STENCIL_WRITEMASK              = 0x0B98;
+    const GLenum STENCIL_BACK_FUNC              = 0x8800;
+    const GLenum STENCIL_BACK_FAIL              = 0x8801;
+    const GLenum STENCIL_BACK_PASS_DEPTH_FAIL   = 0x8802;
+    const GLenum STENCIL_BACK_PASS_DEPTH_PASS   = 0x8803;
+    const GLenum STENCIL_BACK_REF               = 0x8CA3;
+    const GLenum STENCIL_BACK_VALUE_MASK        = 0x8CA4;
+    const GLenum STENCIL_BACK_WRITEMASK         = 0x8CA5;
+    const GLenum VIEWPORT                       = 0x0BA2;
+    const GLenum SCISSOR_BOX                    = 0x0C10;
+    /*      SCISSOR_TEST */
+    const GLenum COLOR_CLEAR_VALUE              = 0x0C22;
+    const GLenum COLOR_WRITEMASK                = 0x0C23;
+    const GLenum UNPACK_ALIGNMENT               = 0x0CF5;
+    const GLenum PACK_ALIGNMENT                 = 0x0D05;
+    const GLenum MAX_TEXTURE_SIZE               = 0x0D33;
+    const GLenum MAX_VIEWPORT_DIMS              = 0x0D3A;
+    const GLenum SUBPIXEL_BITS                  = 0x0D50;
+    const GLenum RED_BITS                       = 0x0D52;
+    const GLenum GREEN_BITS                     = 0x0D53;
+    const GLenum BLUE_BITS                      = 0x0D54;
+    const GLenum ALPHA_BITS                     = 0x0D55;
+    const GLenum DEPTH_BITS                     = 0x0D56;
+    const GLenum STENCIL_BITS                   = 0x0D57;
+    const GLenum POLYGON_OFFSET_UNITS           = 0x2A00;
+    /*      POLYGON_OFFSET_FILL */
+    const GLenum POLYGON_OFFSET_FACTOR          = 0x8038;
+    const GLenum TEXTURE_BINDING_2D             = 0x8069;
+    const GLenum SAMPLE_BUFFERS                 = 0x80A8;
+    const GLenum SAMPLES                        = 0x80A9;
+    const GLenum SAMPLE_COVERAGE_VALUE          = 0x80AA;
+    const GLenum SAMPLE_COVERAGE_INVERT         = 0x80AB;
+
+    /* GetTextureParameter */
+    /*      TEXTURE_MAG_FILTER */
+    /*      TEXTURE_MIN_FILTER */
+    /*      TEXTURE_WRAP_S */
+    /*      TEXTURE_WRAP_T */
+
+    const GLenum COMPRESSED_TEXTURE_FORMATS     = 0x86A3;
+
+    /* HintMode */
+    const GLenum DONT_CARE                      = 0x1100;
+    const GLenum FASTEST                        = 0x1101;
+    const GLenum NICEST                         = 0x1102;
+
+    /* HintTarget */
+    const GLenum GENERATE_MIPMAP_HINT            = 0x8192;
+
+    /* DataType */
+    const GLenum BYTE                           = 0x1400;
+    const GLenum UNSIGNED_BYTE                  = 0x1401;
+    const GLenum SHORT                          = 0x1402;
+    const GLenum UNSIGNED_SHORT                 = 0x1403;
+    const GLenum INT                            = 0x1404;
+    const GLenum UNSIGNED_INT                   = 0x1405;
+    const GLenum FLOAT                          = 0x1406;
+
+    /* PixelFormat */
+    const GLenum DEPTH_COMPONENT                = 0x1902;
+    const GLenum ALPHA                          = 0x1906;
+    const GLenum RGB                            = 0x1907;
+    const GLenum RGBA                           = 0x1908;
+    const GLenum LUMINANCE                      = 0x1909;
+    const GLenum LUMINANCE_ALPHA                = 0x190A;
+
+    /* PixelType */
+    /*      UNSIGNED_BYTE */
+    const GLenum UNSIGNED_SHORT_4_4_4_4         = 0x8033;
+    const GLenum UNSIGNED_SHORT_5_5_5_1         = 0x8034;
+    const GLenum UNSIGNED_SHORT_5_6_5           = 0x8363;
+
+    /* Shaders */
+    const GLenum FRAGMENT_SHADER                  = 0x8B30;
+    const GLenum VERTEX_SHADER                    = 0x8B31;
+    const GLenum MAX_VERTEX_ATTRIBS               = 0x8869;
+    const GLenum MAX_VERTEX_UNIFORM_VECTORS       = 0x8DFB;
+    const GLenum MAX_VARYING_VECTORS              = 0x8DFC;
+    const GLenum MAX_COMBINED_TEXTURE_IMAGE_UNITS = 0x8B4D;
+    const GLenum MAX_VERTEX_TEXTURE_IMAGE_UNITS   = 0x8B4C;
+    const GLenum MAX_TEXTURE_IMAGE_UNITS          = 0x8872;
+    const GLenum MAX_FRAGMENT_UNIFORM_VECTORS     = 0x8DFD;
+    const GLenum SHADER_TYPE                      = 0x8B4F;
+    const GLenum DELETE_STATUS                    = 0x8B80;
+    const GLenum LINK_STATUS                      = 0x8B82;
+    const GLenum VALIDATE_STATUS                  = 0x8B83;
+    const GLenum ATTACHED_SHADERS                 = 0x8B85;
+    const GLenum ACTIVE_UNIFORMS                  = 0x8B86;
+    const GLenum ACTIVE_ATTRIBUTES                = 0x8B89;
+    const GLenum SHADING_LANGUAGE_VERSION         = 0x8B8C;
+    const GLenum CURRENT_PROGRAM                  = 0x8B8D;
+
+    /* StencilFunction */
+    const GLenum NEVER                          = 0x0200;
+    const GLenum LESS                           = 0x0201;
+    const GLenum EQUAL                          = 0x0202;
+    const GLenum LEQUAL                         = 0x0203;
+    const GLenum GREATER                        = 0x0204;
+    const GLenum NOTEQUAL                       = 0x0205;
+    const GLenum GEQUAL                         = 0x0206;
+    const GLenum ALWAYS                         = 0x0207;
+
+    /* StencilOp */
+    /*      ZERO */
+    const GLenum KEEP                           = 0x1E00;
+    const GLenum REPLACE                        = 0x1E01;
+    const GLenum INCR                           = 0x1E02;
+    const GLenum DECR                           = 0x1E03;
+    const GLenum INVERT                         = 0x150A;
+    const GLenum INCR_WRAP                      = 0x8507;
+    const GLenum DECR_WRAP                      = 0x8508;
+
+    /* StringName */
+    const GLenum VENDOR                         = 0x1F00;
+    const GLenum RENDERER                       = 0x1F01;
+    const GLenum VERSION                        = 0x1F02;
+
+    /* TextureMagFilter */
+    const GLenum NEAREST                        = 0x2600;
+    const GLenum LINEAR                         = 0x2601;
+
+    /* TextureMinFilter */
+    /*      NEAREST */
+    /*      LINEAR */
+    const GLenum NEAREST_MIPMAP_NEAREST         = 0x2700;
+    const GLenum LINEAR_MIPMAP_NEAREST          = 0x2701;
+    const GLenum NEAREST_MIPMAP_LINEAR          = 0x2702;
+    const GLenum LINEAR_MIPMAP_LINEAR           = 0x2703;
+
+    /* TextureParameterName */
+    const GLenum TEXTURE_MAG_FILTER             = 0x2800;
+    const GLenum TEXTURE_MIN_FILTER             = 0x2801;
+    const GLenum TEXTURE_WRAP_S                 = 0x2802;
+    const GLenum TEXTURE_WRAP_T                 = 0x2803;
+
+    /* TextureTarget */
+    const GLenum TEXTURE_2D                     = 0x0DE1;
+    const GLenum TEXTURE                        = 0x1702;
+
+    const GLenum TEXTURE_CUBE_MAP               = 0x8513;
+    const GLenum TEXTURE_BINDING_CUBE_MAP       = 0x8514;
+    const GLenum TEXTURE_CUBE_MAP_POSITIVE_X    = 0x8515;
+    const GLenum TEXTURE_CUBE_MAP_NEGATIVE_X    = 0x8516;
+    const GLenum TEXTURE_CUBE_MAP_POSITIVE_Y    = 0x8517;
+    const GLenum TEXTURE_CUBE_MAP_NEGATIVE_Y    = 0x8518;
+    const GLenum TEXTURE_CUBE_MAP_POSITIVE_Z    = 0x8519;
+    const GLenum TEXTURE_CUBE_MAP_NEGATIVE_Z    = 0x851A;
+    const GLenum MAX_CUBE_MAP_TEXTURE_SIZE      = 0x851C;
+
+    /* TextureUnit */
+    const GLenum TEXTURE0                       = 0x84C0;
+    const GLenum TEXTURE1                       = 0x84C1;
+    const GLenum TEXTURE2                       = 0x84C2;
+    const GLenum TEXTURE3                       = 0x84C3;
+    const GLenum TEXTURE4                       = 0x84C4;
+    const GLenum TEXTURE5                       = 0x84C5;
+    const GLenum TEXTURE6                       = 0x84C6;
+    const GLenum TEXTURE7                       = 0x84C7;
+    const GLenum TEXTURE8                       = 0x84C8;
+    const GLenum TEXTURE9                       = 0x84C9;
+    const GLenum TEXTURE10                      = 0x84CA;
+    const GLenum TEXTURE11                      = 0x84CB;
+    const GLenum TEXTURE12                      = 0x84CC;
+    const GLenum TEXTURE13                      = 0x84CD;
+    const GLenum TEXTURE14                      = 0x84CE;
+    const GLenum TEXTURE15                      = 0x84CF;
+    const GLenum TEXTURE16                      = 0x84D0;
+    const GLenum TEXTURE17                      = 0x84D1;
+    const GLenum TEXTURE18                      = 0x84D2;
+    const GLenum TEXTURE19                      = 0x84D3;
+    const GLenum TEXTURE20                      = 0x84D4;
+    const GLenum TEXTURE21                      = 0x84D5;
+    const GLenum TEXTURE22                      = 0x84D6;
+    const GLenum TEXTURE23                      = 0x84D7;
+    const GLenum TEXTURE24                      = 0x84D8;
+    const GLenum TEXTURE25                      = 0x84D9;
+    const GLenum TEXTURE26                      = 0x84DA;
+    const GLenum TEXTURE27                      = 0x84DB;
+    const GLenum TEXTURE28                      = 0x84DC;
+    const GLenum TEXTURE29                      = 0x84DD;
+    const GLenum TEXTURE30                      = 0x84DE;
+    const GLenum TEXTURE31                      = 0x84DF;
+    const GLenum ACTIVE_TEXTURE                 = 0x84E0;
+
+    /* TextureWrapMode */
+    const GLenum REPEAT                         = 0x2901;
+    const GLenum CLAMP_TO_EDGE                  = 0x812F;
+    const GLenum MIRRORED_REPEAT                = 0x8370;
+
+    /* Uniform Types */
+    const GLenum FLOAT_VEC2                     = 0x8B50;
+    const GLenum FLOAT_VEC3                     = 0x8B51;
+    const GLenum FLOAT_VEC4                     = 0x8B52;
+    const GLenum INT_VEC2                       = 0x8B53;
+    const GLenum INT_VEC3                       = 0x8B54;
+    const GLenum INT_VEC4                       = 0x8B55;
+    const GLenum BOOL                           = 0x8B56;
+    const GLenum BOOL_VEC2                      = 0x8B57;
+    const GLenum BOOL_VEC3                      = 0x8B58;
+    const GLenum BOOL_VEC4                      = 0x8B59;
+    const GLenum FLOAT_MAT2                     = 0x8B5A;
+    const GLenum FLOAT_MAT3                     = 0x8B5B;
+    const GLenum FLOAT_MAT4                     = 0x8B5C;
+    const GLenum SAMPLER_2D                     = 0x8B5E;
+    const GLenum SAMPLER_CUBE                   = 0x8B60;
+
+    /* Vertex Arrays */
+    const GLenum VERTEX_ATTRIB_ARRAY_ENABLED        = 0x8622;
+    const GLenum VERTEX_ATTRIB_ARRAY_SIZE           = 0x8623;
+    const GLenum VERTEX_ATTRIB_ARRAY_STRIDE         = 0x8624;
+    const GLenum VERTEX_ATTRIB_ARRAY_TYPE           = 0x8625;
+    const GLenum VERTEX_ATTRIB_ARRAY_NORMALIZED     = 0x886A;
+    const GLenum VERTEX_ATTRIB_ARRAY_POINTER        = 0x8645;
+    const GLenum VERTEX_ATTRIB_ARRAY_BUFFER_BINDING = 0x889F;
+
+    /* Read Format */
+    const GLenum IMPLEMENTATION_COLOR_READ_TYPE   = 0x8B9A;
+    const GLenum IMPLEMENTATION_COLOR_READ_FORMAT = 0x8B9B;
+
+    /* Shader Source */
+    const GLenum COMPILE_STATUS                 = 0x8B81;
+
+    /* Shader Precision-Specified Types */
+    const GLenum LOW_FLOAT                      = 0x8DF0;
+    const GLenum MEDIUM_FLOAT                   = 0x8DF1;
+    const GLenum HIGH_FLOAT                     = 0x8DF2;
+    const GLenum LOW_INT                        = 0x8DF3;
+    const GLenum MEDIUM_INT                     = 0x8DF4;
+    const GLenum HIGH_INT                       = 0x8DF5;
+
+    /* Framebuffer Object. */
+    const GLenum FRAMEBUFFER                    = 0x8D40;
+    const GLenum RENDERBUFFER                   = 0x8D41;
+
+    const GLenum RGBA4                          = 0x8056;
+    const GLenum RGB5_A1                        = 0x8057;
+    const GLenum RGB565                         = 0x8D62;
+    const GLenum DEPTH_COMPONENT16              = 0x81A5;
+    const GLenum STENCIL_INDEX8                 = 0x8D48;
+    const GLenum DEPTH_STENCIL                  = 0x84F9;
+
+    const GLenum RENDERBUFFER_WIDTH             = 0x8D42;
+    const GLenum RENDERBUFFER_HEIGHT            = 0x8D43;
+    const GLenum RENDERBUFFER_INTERNAL_FORMAT   = 0x8D44;
+    const GLenum RENDERBUFFER_RED_SIZE          = 0x8D50;
+    const GLenum RENDERBUFFER_GREEN_SIZE        = 0x8D51;
+    const GLenum RENDERBUFFER_BLUE_SIZE         = 0x8D52;
+    const GLenum RENDERBUFFER_ALPHA_SIZE        = 0x8D53;
+    const GLenum RENDERBUFFER_DEPTH_SIZE        = 0x8D54;
+    const GLenum RENDERBUFFER_STENCIL_SIZE      = 0x8D55;
+
+    const GLenum FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE           = 0x8CD0;
+    const GLenum FRAMEBUFFER_ATTACHMENT_OBJECT_NAME           = 0x8CD1;
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL         = 0x8CD2;
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE = 0x8CD3;
+
+    const GLenum COLOR_ATTACHMENT0              = 0x8CE0;
+    const GLenum DEPTH_ATTACHMENT               = 0x8D00;
+    const GLenum STENCIL_ATTACHMENT             = 0x8D20;
+    const GLenum DEPTH_STENCIL_ATTACHMENT       = 0x821A;
+
+    const GLenum NONE                           = 0;
+
+    const GLenum FRAMEBUFFER_COMPLETE                      = 0x8CD5;
+    const GLenum FRAMEBUFFER_INCOMPLETE_ATTACHMENT         = 0x8CD6;
+    const GLenum FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT = 0x8CD7;
+    const GLenum FRAMEBUFFER_INCOMPLETE_DIMENSIONS         = 0x8CD9;
+    const GLenum FRAMEBUFFER_UNSUPPORTED                   = 0x8CDD;
+
+    const GLenum FRAMEBUFFER_BINDING            = 0x8CA6;
+    const GLenum RENDERBUFFER_BINDING           = 0x8CA7;
+    const GLenum MAX_RENDERBUFFER_SIZE          = 0x84E8;
+
+    const GLenum INVALID_FRAMEBUFFER_OPERATION  = 0x0506;
+
+    /* WebGL-specific enums */
+    const GLenum UNPACK_FLIP_Y_WEBGL            = 0x9240;
+    const GLenum UNPACK_PREMULTIPLY_ALPHA_WEBGL = 0x9241;
+    const GLenum CONTEXT_LOST_WEBGL             = 0x9242;
+    const GLenum UNPACK_COLORSPACE_CONVERSION_WEBGL = 0x9243;
+    const GLenum BROWSER_DEFAULT_WEBGL          = 0x9244;
+
+    // The canvas might actually be null in some cases, apparently.
+    readonly attribute CanvasSource? canvas;
+    readonly attribute GLsizei drawingBufferWidth;
+    readonly attribute GLsizei drawingBufferHeight;
+
+    [WebGLHandlesContextLoss] WebGLContextAttributes? getContextAttributes();
+    [WebGLHandlesContextLoss] boolean isContextLost();
+
+    [NeedsCallerType]
+    sequence<DOMString>? getSupportedExtensions();
+
+    [Throws, NeedsCallerType]
+    object? getExtension(DOMString name);
+
+    undefined activeTexture(GLenum texture);
+    undefined attachShader(WebGLProgram program, WebGLShader shader);
+    undefined bindAttribLocation(WebGLProgram program, GLuint index, DOMString name);
+    undefined bindBuffer(GLenum target, WebGLBuffer? buffer);
+    undefined bindFramebuffer(GLenum target, WebGLFramebuffer? framebuffer);
+    undefined bindRenderbuffer(GLenum target, WebGLRenderbuffer? renderbuffer);
+    undefined bindTexture(GLenum target, WebGLTexture? texture);
+    undefined blendColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
+    undefined blendEquation(GLenum mode);
+    undefined blendEquationSeparate(GLenum modeRGB, GLenum modeAlpha);
+    undefined blendFunc(GLenum sfactor, GLenum dfactor);
+    undefined blendFuncSeparate(GLenum srcRGB, GLenum dstRGB,
+                                GLenum srcAlpha, GLenum dstAlpha);
+
+    [WebGLHandlesContextLoss] GLenum checkFramebufferStatus(GLenum target);
+    undefined clear(GLbitfield mask);
+    undefined clearColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
+    undefined clearDepth(GLclampf depth);
+    undefined clearStencil(GLint s);
+    undefined colorMask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);
+    undefined compileShader(WebGLShader shader);
+
+    undefined copyTexImage2D(GLenum target, GLint level, GLenum internalformat,
+                             GLint x, GLint y, GLsizei width, GLsizei height,
+                             GLint border);
+    undefined copyTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                GLint x, GLint y, GLsizei width, GLsizei height);
+
+    WebGLBuffer? createBuffer();
+    WebGLFramebuffer? createFramebuffer();
+    WebGLProgram? createProgram();
+    WebGLRenderbuffer? createRenderbuffer();
+    WebGLShader? createShader(GLenum type);
+    WebGLTexture? createTexture();
+
+    undefined cullFace(GLenum mode);
+
+    undefined deleteBuffer(WebGLBuffer? buffer);
+    undefined deleteFramebuffer(WebGLFramebuffer? framebuffer);
+    undefined deleteProgram(WebGLProgram? program);
+    undefined deleteRenderbuffer(WebGLRenderbuffer? renderbuffer);
+    undefined deleteShader(WebGLShader? shader);
+    undefined deleteTexture(WebGLTexture? texture);
+
+    undefined depthFunc(GLenum func);
+    undefined depthMask(GLboolean flag);
+    undefined depthRange(GLclampf zNear, GLclampf zFar);
+    undefined detachShader(WebGLProgram program, WebGLShader shader);
+    undefined disable(GLenum cap);
+    undefined disableVertexAttribArray(GLuint index);
+    undefined drawArrays(GLenum mode, GLint first, GLsizei count);
+    undefined drawElements(GLenum mode, GLsizei count, GLenum type, GLintptr offset);
+
+    undefined enable(GLenum cap);
+    undefined enableVertexAttribArray(GLuint index);
+    undefined finish();
+    undefined flush();
+    undefined framebufferRenderbuffer(GLenum target, GLenum attachment,
+                                      GLenum renderbuffertarget,
+                                      WebGLRenderbuffer? renderbuffer);
+    undefined framebufferTexture2D(GLenum target, GLenum attachment, GLenum textarget,
+                                   WebGLTexture? texture, GLint level);
+    undefined frontFace(GLenum mode);
+
+    undefined generateMipmap(GLenum target);
+
+    [NewObject]
+    WebGLActiveInfo? getActiveAttrib(WebGLProgram program, GLuint index);
+    [NewObject]
+    WebGLActiveInfo? getActiveUniform(WebGLProgram program, GLuint index);
+
+    sequence<WebGLShader>? getAttachedShaders(WebGLProgram program);
+
+    [WebGLHandlesContextLoss] GLint getAttribLocation(WebGLProgram program, DOMString name);
+
+    any getBufferParameter(GLenum target, GLenum pname);
+    [Throws]
+    any getParameter(GLenum pname);
+
+    [WebGLHandlesContextLoss] GLenum getError();
+
+    [Throws]
+    any getFramebufferAttachmentParameter(GLenum target, GLenum attachment,
+                                          GLenum pname);
+    any getProgramParameter(WebGLProgram program, GLenum pname);
+    DOMString? getProgramInfoLog(WebGLProgram program);
+    any getRenderbufferParameter(GLenum target, GLenum pname);
+    any getShaderParameter(WebGLShader shader, GLenum pname);
+
+    [NewObject]
+    WebGLShaderPrecisionFormat? getShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype);
+
+    DOMString? getShaderInfoLog(WebGLShader shader);
+
+    DOMString? getShaderSource(WebGLShader shader);
+
+    any getTexParameter(GLenum target, GLenum pname);
+
+    any getUniform(WebGLProgram program, WebGLUniformLocation location);
+
+    [NewObject]
+    WebGLUniformLocation? getUniformLocation(WebGLProgram program, DOMString name);
+
+    [Throws]
+    any getVertexAttrib(GLuint index, GLenum pname);
+
+    [WebGLHandlesContextLoss] GLintptr getVertexAttribOffset(GLuint index, GLenum pname);
+
+    undefined hint(GLenum target, GLenum mode);
+    [WebGLHandlesContextLoss] GLboolean isBuffer(WebGLBuffer? buffer);
+    [WebGLHandlesContextLoss] GLboolean isEnabled(GLenum cap);
+    [WebGLHandlesContextLoss] GLboolean isFramebuffer(WebGLFramebuffer? framebuffer);
+    [WebGLHandlesContextLoss] GLboolean isProgram(WebGLProgram? program);
+    [WebGLHandlesContextLoss] GLboolean isRenderbuffer(WebGLRenderbuffer? renderbuffer);
+    [WebGLHandlesContextLoss] GLboolean isShader(WebGLShader? shader);
+    [WebGLHandlesContextLoss] GLboolean isTexture(WebGLTexture? texture);
+    undefined lineWidth(GLfloat width);
+    undefined linkProgram(WebGLProgram program);
+    undefined pixelStorei(GLenum pname, GLint param);
+    undefined polygonOffset(GLfloat factor, GLfloat units);
+
+    undefined renderbufferStorage(GLenum target, GLenum internalformat,
+                             GLsizei width, GLsizei height);
+    undefined sampleCoverage(GLclampf value, GLboolean invert);
+    undefined scissor(GLint x, GLint y, GLsizei width, GLsizei height);
+
+    undefined shaderSource(WebGLShader shader, DOMString source);
+
+    undefined stencilFunc(GLenum func, GLint ref, GLuint mask);
+    undefined stencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask);
+    undefined stencilMask(GLuint mask);
+    undefined stencilMaskSeparate(GLenum face, GLuint mask);
+    undefined stencilOp(GLenum fail, GLenum zfail, GLenum zpass);
+    undefined stencilOpSeparate(GLenum face, GLenum fail, GLenum zfail, GLenum zpass);
+
+    undefined texParameterf(GLenum target, GLenum pname, GLfloat param);
+    undefined texParameteri(GLenum target, GLenum pname, GLint param);
+
+    undefined uniform1f(WebGLUniformLocation? location, GLfloat x);
+    undefined uniform2f(WebGLUniformLocation? location, GLfloat x, GLfloat y);
+    undefined uniform3f(WebGLUniformLocation? location, GLfloat x, GLfloat y, GLfloat z);
+    undefined uniform4f(WebGLUniformLocation? location, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
+
+    undefined uniform1i(WebGLUniformLocation? location, GLint x);
+    undefined uniform2i(WebGLUniformLocation? location, GLint x, GLint y);
+    undefined uniform3i(WebGLUniformLocation? location, GLint x, GLint y, GLint z);
+    undefined uniform4i(WebGLUniformLocation? location, GLint x, GLint y, GLint z, GLint w);
+
+    undefined useProgram(WebGLProgram? program);
+    undefined validateProgram(WebGLProgram program);
+
+    undefined vertexAttrib1f(GLuint indx, GLfloat x);
+    undefined vertexAttrib1fv(GLuint indx, Float32List values);
+    undefined vertexAttrib2f(GLuint indx, GLfloat x, GLfloat y);
+    undefined vertexAttrib2fv(GLuint indx, Float32List values);
+    undefined vertexAttrib3f(GLuint indx, GLfloat x, GLfloat y, GLfloat z);
+    undefined vertexAttrib3fv(GLuint indx, Float32List values);
+    undefined vertexAttrib4f(GLuint indx, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
+    undefined vertexAttrib4fv(GLuint indx, Float32List values);
+    undefined vertexAttribPointer(GLuint indx, GLint size, GLenum type,
+                                  GLboolean normalized, GLsizei stride, GLintptr offset);
+
+    undefined viewport(GLint x, GLint y, GLsizei width, GLsizei height);
+};
+
+[Exposed=(Window,Worker),
+ Func="mozilla::dom::OffscreenCanvas::PrefEnabledOnWorkerThread"]
+interface WebGLRenderingContext {
+    // bufferData has WebGL2 overloads.
+    undefined bufferData(GLenum target, GLsizeiptr size, GLenum usage);
+    undefined bufferData(GLenum target, [AllowShared] ArrayBuffer? data, GLenum usage);
+    undefined bufferData(GLenum target, [AllowShared] ArrayBufferView data, GLenum usage);
+    // bufferSubData has WebGL2 overloads.
+    undefined bufferSubData(GLenum target, GLintptr offset, [AllowShared] ArrayBuffer data);
+    undefined bufferSubData(GLenum target, GLintptr offset, [AllowShared] ArrayBufferView data);
+
+    // compressedTexImage2D has WebGL2 overloads.
+    undefined compressedTexImage2D(GLenum target, GLint level, GLenum internalformat,
+                                   GLsizei width, GLsizei height, GLint border,
+                                   [AllowShared] ArrayBufferView data);
+    // compressedTexSubImage2D has WebGL2 overloads.
+    undefined compressedTexSubImage2D(GLenum target, GLint level,
+                                      GLint xoffset, GLint yoffset,
+                                      GLsizei width, GLsizei height, GLenum format,
+                                      [AllowShared] ArrayBufferView data);
+
+    // readPixels has WebGL2 overloads.
+    [Throws, NeedsCallerType]
+    undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height,
+                    GLenum format, GLenum type, [AllowShared] ArrayBufferView? pixels);
+
+    // texImage2D has WebGL2 overloads.
+    // Overloads must share [Throws].
+    [Throws] // Can't actually throw.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLsizei width, GLsizei height, GLint border, GLenum format,
+                         GLenum type, [AllowShared] ArrayBufferView? pixels);
+    [Throws] // Can't actually throw.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, ImageBitmap pixels);
+    [Throws] // Can't actually throw.
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, ImageData pixels);
+    [Throws]
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, HTMLImageElement image); // May throw DOMException
+    [Throws]
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, HTMLCanvasElement canvas); // May throw DOMException
+    [Throws]
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, HTMLVideoElement video); // May throw DOMException
+    [Throws]
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, OffscreenCanvas canvas); // May throw DOMException
+
+    // texSubImage2D has WebGL2 overloads.
+    [Throws] // Can't actually throw.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLsizei width, GLsizei height,
+                            GLenum format, GLenum type, [AllowShared] ArrayBufferView? pixels);
+    [Throws] // Can't actually throw.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, ImageBitmap pixels);
+    [Throws] // Can't actually throw.
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, ImageData pixels);
+    [Throws]
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, HTMLImageElement image); // May throw DOMException
+    [Throws]
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, HTMLCanvasElement canvas); // May throw DOMException
+    [Throws]
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, HTMLVideoElement video); // May throw DOMException
+    [Throws]
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, OffscreenCanvas canvas); // May throw DOMException
+
+    // uniform*fv have WebGL2 overloads, or rather extensions, that are not
+    // distinguishable from the WebGL1 versions when called with two arguments.
+    undefined uniform1fv(WebGLUniformLocation? location, Float32List data);
+    undefined uniform2fv(WebGLUniformLocation? location, Float32List data);
+    undefined uniform3fv(WebGLUniformLocation? location, Float32List data);
+    undefined uniform4fv(WebGLUniformLocation? location, Float32List data);
+
+    // uniform*iv have WebGL2 overloads, or rather extensions, that are not
+    // distinguishable from the WebGL1 versions when called with two arguments.
+    undefined uniform1iv(WebGLUniformLocation? location, Int32List data);
+    undefined uniform2iv(WebGLUniformLocation? location, Int32List data);
+    undefined uniform3iv(WebGLUniformLocation? location, Int32List data);
+    undefined uniform4iv(WebGLUniformLocation? location, Int32List data);
+
+    // uniformMatrix*fv have WebGL2 overloads, or rather extensions, that are
+    // not distinguishable from the WebGL1 versions when called with two
+    // arguments.
+    undefined uniformMatrix2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data);
+    undefined uniformMatrix3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data);
+    undefined uniformMatrix4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data);
+};
+
+WebGLRenderingContext includes WebGLRenderingContextBase;
+
+////////////////////////////////////////
+// specific extension interfaces
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_texture_compression_bptc {
+    const GLenum COMPRESSED_RGBA_BPTC_UNORM_EXT = 0x8E8C;
+    const GLenum COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT = 0x8E8D;
+    const GLenum COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT = 0x8E8E;
+    const GLenum COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT = 0x8E8F;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_texture_compression_rgtc {
+    const GLenum COMPRESSED_RED_RGTC1_EXT = 0x8DBB;
+    const GLenum COMPRESSED_SIGNED_RED_RGTC1_EXT = 0x8DBC;
+    const GLenum COMPRESSED_RED_GREEN_RGTC2_EXT = 0x8DBD;
+    const GLenum COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT = 0x8DBE;
+};
+
+// https://www.khronos.org/registry/webgl/extensions/EXT_texture_norm16/
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_texture_norm16 {
+  const GLenum R16_EXT = 0x822A;
+  const GLenum RG16_EXT = 0x822C;
+  const GLenum RGB16_EXT = 0x8054;
+  const GLenum RGBA16_EXT = 0x805B;
+  const GLenum R16_SNORM_EXT = 0x8F98;
+  const GLenum RG16_SNORM_EXT = 0x8F99;
+  const GLenum RGB16_SNORM_EXT = 0x8F9A;
+  const GLenum RGBA16_SNORM_EXT = 0x8F9B;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_compressed_texture_s3tc
+{
+    const GLenum COMPRESSED_RGB_S3TC_DXT1_EXT  = 0x83F0;
+    const GLenum COMPRESSED_RGBA_S3TC_DXT1_EXT = 0x83F1;
+    const GLenum COMPRESSED_RGBA_S3TC_DXT3_EXT = 0x83F2;
+    const GLenum COMPRESSED_RGBA_S3TC_DXT5_EXT = 0x83F3;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_compressed_texture_s3tc_srgb {
+    /* Compressed Texture Formats */
+    const GLenum COMPRESSED_SRGB_S3TC_DXT1_EXT        = 0x8C4C;
+    const GLenum COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT  = 0x8C4D;
+    const GLenum COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT  = 0x8C4E;
+    const GLenum COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT  = 0x8C4F;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_compressed_texture_astc {
+    /* Compressed Texture Format */
+    const GLenum COMPRESSED_RGBA_ASTC_4x4_KHR = 0x93B0;
+    const GLenum COMPRESSED_RGBA_ASTC_5x4_KHR = 0x93B1;
+    const GLenum COMPRESSED_RGBA_ASTC_5x5_KHR = 0x93B2;
+    const GLenum COMPRESSED_RGBA_ASTC_6x5_KHR = 0x93B3;
+    const GLenum COMPRESSED_RGBA_ASTC_6x6_KHR = 0x93B4;
+    const GLenum COMPRESSED_RGBA_ASTC_8x5_KHR = 0x93B5;
+    const GLenum COMPRESSED_RGBA_ASTC_8x6_KHR = 0x93B6;
+    const GLenum COMPRESSED_RGBA_ASTC_8x8_KHR = 0x93B7;
+    const GLenum COMPRESSED_RGBA_ASTC_10x5_KHR = 0x93B8;
+    const GLenum COMPRESSED_RGBA_ASTC_10x6_KHR = 0x93B9;
+    const GLenum COMPRESSED_RGBA_ASTC_10x8_KHR = 0x93BA;
+    const GLenum COMPRESSED_RGBA_ASTC_10x10_KHR = 0x93BB;
+    const GLenum COMPRESSED_RGBA_ASTC_12x10_KHR = 0x93BC;
+    const GLenum COMPRESSED_RGBA_ASTC_12x12_KHR = 0x93BD;
+
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR = 0x93D0;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR = 0x93D1;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR = 0x93D2;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR = 0x93D3;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR = 0x93D4;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR = 0x93D5;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR = 0x93D6;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR = 0x93D7;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR = 0x93D8;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR = 0x93D9;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR = 0x93DA;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR = 0x93DB;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR = 0x93DC;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR = 0x93DD;
+
+    // Profile query support.
+    sequence<DOMString>? getSupportedProfiles();
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_compressed_texture_etc
+{
+    const GLenum COMPRESSED_R11_EAC                                 = 0x9270;
+    const GLenum COMPRESSED_SIGNED_R11_EAC                          = 0x9271;
+    const GLenum COMPRESSED_RG11_EAC                                = 0x9272;
+    const GLenum COMPRESSED_SIGNED_RG11_EAC                         = 0x9273;
+    const GLenum COMPRESSED_RGB8_ETC2                               = 0x9274;
+    const GLenum COMPRESSED_SRGB8_ETC2                              = 0x9275;
+    const GLenum COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2           = 0x9276;
+    const GLenum COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2          = 0x9277;
+    const GLenum COMPRESSED_RGBA8_ETC2_EAC                          = 0x9278;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ETC2_EAC                   = 0x9279;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_compressed_texture_etc1
+{
+    const GLenum COMPRESSED_RGB_ETC1_WEBGL = 0x8D64;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_compressed_texture_pvrtc
+{
+    const GLenum COMPRESSED_RGB_PVRTC_4BPPV1_IMG  = 0x8C00;
+    const GLenum COMPRESSED_RGB_PVRTC_2BPPV1_IMG  = 0x8C01;
+    const GLenum COMPRESSED_RGBA_PVRTC_4BPPV1_IMG = 0x8C02;
+    const GLenum COMPRESSED_RGBA_PVRTC_2BPPV1_IMG = 0x8C03;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_debug_renderer_info
+{
+    const GLenum UNMASKED_VENDOR_WEBGL        = 0x9245;
+    const GLenum UNMASKED_RENDERER_WEBGL      = 0x9246;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_debug_shaders
+{
+    DOMString getTranslatedShaderSource(WebGLShader shader);
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_depth_texture
+{
+    const GLenum UNSIGNED_INT_24_8_WEBGL = 0x84FA;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface OES_element_index_uint
+{
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_frag_depth
+{
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_lose_context {
+    undefined loseContext();
+    undefined restoreContext();
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_texture_filter_anisotropic
+{
+    const GLenum TEXTURE_MAX_ANISOTROPY_EXT     = 0x84FE;
+    const GLenum MAX_TEXTURE_MAX_ANISOTROPY_EXT = 0x84FF;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_sRGB
+{
+    const GLenum SRGB_EXT                                  = 0x8C40;
+    const GLenum SRGB_ALPHA_EXT                            = 0x8C42;
+    const GLenum SRGB8_ALPHA8_EXT                          = 0x8C43;
+    const GLenum FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT = 0x8210;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface OES_standard_derivatives {
+    const GLenum FRAGMENT_SHADER_DERIVATIVE_HINT_OES = 0x8B8B;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface OES_texture_float
+{
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_draw_buffers {
+    const GLenum COLOR_ATTACHMENT0_WEBGL     = 0x8CE0;
+    const GLenum COLOR_ATTACHMENT1_WEBGL     = 0x8CE1;
+    const GLenum COLOR_ATTACHMENT2_WEBGL     = 0x8CE2;
+    const GLenum COLOR_ATTACHMENT3_WEBGL     = 0x8CE3;
+    const GLenum COLOR_ATTACHMENT4_WEBGL     = 0x8CE4;
+    const GLenum COLOR_ATTACHMENT5_WEBGL     = 0x8CE5;
+    const GLenum COLOR_ATTACHMENT6_WEBGL     = 0x8CE6;
+    const GLenum COLOR_ATTACHMENT7_WEBGL     = 0x8CE7;
+    const GLenum COLOR_ATTACHMENT8_WEBGL     = 0x8CE8;
+    const GLenum COLOR_ATTACHMENT9_WEBGL     = 0x8CE9;
+    const GLenum COLOR_ATTACHMENT10_WEBGL    = 0x8CEA;
+    const GLenum COLOR_ATTACHMENT11_WEBGL    = 0x8CEB;
+    const GLenum COLOR_ATTACHMENT12_WEBGL    = 0x8CEC;
+    const GLenum COLOR_ATTACHMENT13_WEBGL    = 0x8CED;
+    const GLenum COLOR_ATTACHMENT14_WEBGL    = 0x8CEE;
+    const GLenum COLOR_ATTACHMENT15_WEBGL    = 0x8CEF;
+
+    const GLenum DRAW_BUFFER0_WEBGL          = 0x8825;
+    const GLenum DRAW_BUFFER1_WEBGL          = 0x8826;
+    const GLenum DRAW_BUFFER2_WEBGL          = 0x8827;
+    const GLenum DRAW_BUFFER3_WEBGL          = 0x8828;
+    const GLenum DRAW_BUFFER4_WEBGL          = 0x8829;
+    const GLenum DRAW_BUFFER5_WEBGL          = 0x882A;
+    const GLenum DRAW_BUFFER6_WEBGL          = 0x882B;
+    const GLenum DRAW_BUFFER7_WEBGL          = 0x882C;
+    const GLenum DRAW_BUFFER8_WEBGL          = 0x882D;
+    const GLenum DRAW_BUFFER9_WEBGL          = 0x882E;
+    const GLenum DRAW_BUFFER10_WEBGL         = 0x882F;
+    const GLenum DRAW_BUFFER11_WEBGL         = 0x8830;
+    const GLenum DRAW_BUFFER12_WEBGL         = 0x8831;
+    const GLenum DRAW_BUFFER13_WEBGL         = 0x8832;
+    const GLenum DRAW_BUFFER14_WEBGL         = 0x8833;
+    const GLenum DRAW_BUFFER15_WEBGL         = 0x8834;
+
+    const GLenum MAX_COLOR_ATTACHMENTS_WEBGL = 0x8CDF;
+    const GLenum MAX_DRAW_BUFFERS_WEBGL      = 0x8824;
+
+    undefined drawBuffersWEBGL(sequence<GLenum> buffers);
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface OES_texture_float_linear
+{
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_shader_texture_lod
+{
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface OES_texture_half_float
+{
+    const GLenum HALF_FLOAT_OES = 0x8D61;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface OES_texture_half_float_linear
+{
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_color_buffer_float
+{
+    const GLenum RGBA32F_EXT = 0x8814;
+    const GLenum RGB32F_EXT = 0x8815;
+    const GLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT = 0x8211;
+    const GLenum UNSIGNED_NORMALIZED_EXT = 0x8C17;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_color_buffer_half_float
+{
+    const GLenum RGBA16F_EXT = 0x881A;
+    const GLenum RGB16F_EXT = 0x881B;
+    const GLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT = 0x8211;
+    const GLenum UNSIGNED_NORMALIZED_EXT = 0x8C17;
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface OES_vertex_array_object {
+    const GLenum VERTEX_ARRAY_BINDING_OES = 0x85B5;
+
+    WebGLVertexArrayObject? createVertexArrayOES();
+    undefined deleteVertexArrayOES(WebGLVertexArrayObject? arrayObject);
+    [WebGLHandlesContextLoss] GLboolean isVertexArrayOES(WebGLVertexArrayObject? arrayObject);
+    undefined bindVertexArrayOES(WebGLVertexArrayObject? arrayObject);
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface ANGLE_instanced_arrays {
+    const GLenum VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE = 0x88FE;
+
+    undefined drawArraysInstancedANGLE(GLenum mode, GLint first, GLsizei count, GLsizei primcount);
+    undefined drawElementsInstancedANGLE(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei primcount);
+    undefined vertexAttribDivisorANGLE(GLuint index, GLuint divisor);
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_blend_minmax {
+    const GLenum MIN_EXT = 0x8007;
+    const GLenum MAX_EXT = 0x8008;
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLQuery {
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_disjoint_timer_query {
+    const GLenum QUERY_COUNTER_BITS_EXT = 0x8864;
+    const GLenum CURRENT_QUERY_EXT = 0x8865;
+    const GLenum QUERY_RESULT_EXT = 0x8866;
+    const GLenum QUERY_RESULT_AVAILABLE_EXT = 0x8867;
+    const GLenum TIME_ELAPSED_EXT = 0x88BF;
+    const GLenum TIMESTAMP_EXT = 0x8E28;
+    const GLenum GPU_DISJOINT_EXT = 0x8FBB;
+
+    WebGLQuery? createQueryEXT();
+    undefined deleteQueryEXT(WebGLQuery? query);
+    [WebGLHandlesContextLoss] boolean isQueryEXT(WebGLQuery? query);
+    undefined beginQueryEXT(GLenum target, WebGLQuery query);
+    undefined endQueryEXT(GLenum target);
+    undefined queryCounterEXT(WebGLQuery query, GLenum target);
+    any getQueryEXT(GLenum target, GLenum pname);
+    any getQueryObjectEXT(WebGLQuery query, GLenum pname);
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface MOZ_debug {
+    const GLenum EXTENSIONS = 0x1F03;
+
+    const GLenum WSI_INFO   = 0x10000;
+    const GLenum UNPACK_REQUIRE_FASTPATH = 0x10001;
+    const GLenum DOES_INDEX_VALIDATION   = 0x10002;
+
+    [Throws]
+    any getParameter(GLenum pname);
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface EXT_float_blend {
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface OES_fbo_render_mipmap {
+};
+
+[LegacyNoInterfaceObject,
+ Exposed=(Window,Worker)]
+interface WEBGL_explicit_present {
+    undefined present();
+};
+
+// https://www.khronos.org/registry/webgl/extensions/OES_draw_buffers_indexed/
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OES_draw_buffers_indexed {
+  undefined enableiOES(GLenum target, GLuint index);
+
+  undefined disableiOES(GLenum target, GLuint index);
+
+  undefined blendEquationiOES(GLuint buf, GLenum mode);
+
+  undefined blendEquationSeparateiOES(GLuint buf,
+                                      GLenum modeRGB, GLenum modeAlpha);
+
+  undefined blendFunciOES(GLuint buf,
+                          GLenum src, GLenum dst);
+
+  undefined blendFuncSeparateiOES(GLuint buf,
+                                  GLenum srcRGB, GLenum dstRGB,
+                                  GLenum srcAlpha, GLenum dstAlpha);
+
+  undefined colorMaskiOES(GLuint buf,
+                          GLboolean r, GLboolean g, GLboolean b, GLboolean a);
+};
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_provoking_vertex {
+    const GLenum FIRST_VERTEX_CONVENTION_WEBGL = 0x8E4D;
+    const GLenum LAST_VERTEX_CONVENTION_WEBGL  = 0x8E4E; // default
+    const GLenum PROVOKING_VERTEX_WEBGL        = 0x8E4F;
+
+    undefined provokingVertexWEBGL(GLenum provokeMode);
+};
+
+// https://immersive-web.github.io/webxr/#dom-webglcontextattributes-xrcompatible
+partial dictionary WebGLContextAttributes {
+    [Pref="dom.vr.webxr.enabled"]
+    boolean xrCompatible = false;
+};
+
+// https://immersive-web.github.io/webxr/#dom-webglrenderingcontextbase-makexrcompatible
+partial interface mixin WebGLRenderingContextBase {
+    [NewObject, Pref="dom.vr.webxr.enabled"]
+    Promise<undefined> makeXRCompatible();
+};
diff --git a/dom/webidl/WebGPU.webidl b/dom/webidl/WebGPU.webidl
new file mode 100644
index 0000000000..39a9c5a4b3
--- /dev/null
+++ b/dom/webidl/WebGPU.webidl
@@ -0,0 +1,1231 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://gpuweb.github.io/gpuweb/
+ */
+
+interface mixin GPUObjectBase {
+    attribute USVString? label;
+};
+
+dictionary GPUObjectDescriptorBase {
+    USVString label;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUSupportedLimits {
+    readonly attribute unsigned long maxTextureDimension1D;
+    readonly attribute unsigned long maxTextureDimension2D;
+    readonly attribute unsigned long maxTextureDimension3D;
+    readonly attribute unsigned long maxTextureArrayLayers;
+    readonly attribute unsigned long maxBindGroups;
+    readonly attribute unsigned long maxDynamicUniformBuffersPerPipelineLayout;
+    readonly attribute unsigned long maxDynamicStorageBuffersPerPipelineLayout;
+    readonly attribute unsigned long maxSampledTexturesPerShaderStage;
+    readonly attribute unsigned long maxSamplersPerShaderStage;
+    readonly attribute unsigned long maxStorageBuffersPerShaderStage;
+    readonly attribute unsigned long maxStorageTexturesPerShaderStage;
+    readonly attribute unsigned long maxUniformBuffersPerShaderStage;
+    readonly attribute unsigned long maxUniformBufferBindingSize;
+    readonly attribute unsigned long maxStorageBufferBindingSize;
+    readonly attribute unsigned long minUniformBufferOffsetAlignment;
+    readonly attribute unsigned long minStorageBufferOffsetAlignment;
+    readonly attribute unsigned long maxVertexBuffers;
+    readonly attribute unsigned long maxVertexAttributes;
+    readonly attribute unsigned long maxVertexBufferArrayStride;
+    readonly attribute unsigned long maxInterStageShaderComponents;
+    readonly attribute unsigned long maxComputeWorkgroupStorageSize;
+    readonly attribute unsigned long maxComputeInvocationsPerWorkgroup;
+    readonly attribute unsigned long maxComputeWorkgroupSizeX;
+    readonly attribute unsigned long maxComputeWorkgroupSizeY;
+    readonly attribute unsigned long maxComputeWorkgroupSizeZ;
+    readonly attribute unsigned long maxComputeWorkgroupsPerDimension;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUSupportedFeatures {
+    readonly setlike<DOMString>;
+};
+
+// ****************************************************************************
+// INITIALIZATION
+// ****************************************************************************
+
+[
+    Pref="dom.webgpu.enabled",
+    Exposed=(Window /* ,DedicatedWorker */), SecureContext
+]
+interface GPU {
+    // May reject with DOMException
+    [NewObject]
+    Promise<GPUAdapter?> requestAdapter(optional GPURequestAdapterOptions options = {});
+    GPUTextureFormat getPreferredCanvasFormat();
+};
+
+// Add a "webgpu" member to Navigator/Worker that contains the global instance of a "WebGPU"
+interface mixin GPUProvider {
+    [SameObject, Replaceable, Pref="dom.webgpu.enabled", Exposed=(Window /* ,DedicatedWorker */), SecureContext] readonly attribute GPU gpu;
+};
+
+dictionary GPURequestAdapterOptions {
+    GPUPowerPreference powerPreference;
+    boolean forceFallbackAdapter = false;
+};
+
+enum GPUPowerPreference {
+    "low-power",
+    "high-performance"
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUAdapterInfo {
+    readonly attribute DOMString vendor;
+    readonly attribute DOMString architecture;
+    readonly attribute DOMString device;
+    readonly attribute DOMString description;
+
+    // Non-standard; see <https://bugzilla.mozilla.org/show_bug.cgi?id=1831994>.
+    [ChromeOnly] readonly attribute DOMString wgpuName;
+    [ChromeOnly] readonly attribute unsigned long wgpuVendor;
+    [ChromeOnly] readonly attribute unsigned long wgpuDevice;
+    [ChromeOnly] readonly attribute DOMString wgpuDeviceType;
+    [ChromeOnly] readonly attribute DOMString wgpuDriver;
+    [ChromeOnly] readonly attribute DOMString wgpuDriverInfo;
+    [ChromeOnly] readonly attribute DOMString wgpuBackend;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUAdapter {
+    [SameObject] readonly attribute GPUSupportedFeatures features;
+    [SameObject] readonly attribute GPUSupportedLimits limits;
+    readonly attribute boolean isFallbackAdapter;
+
+    [NewObject]
+    Promise<GPUDevice> requestDevice(optional GPUDeviceDescriptor descriptor = {});
+    [NewObject]
+    Promise<GPUAdapterInfo> requestAdapterInfo(optional sequence<DOMString> unmaskHints = []);
+};
+
+dictionary GPUDeviceDescriptor {
+    sequence<GPUFeatureName> requiredFeatures = [];
+    record<DOMString, GPUSize64> requiredLimits;
+};
+
+enum GPUFeatureName {
+    "depth-clip-control",
+    "depth24unorm-stencil8",
+    "depth32float-stencil8",
+    "pipeline-statistics-query",
+    "texture-compression-bc",
+    "texture-compression-etc2",
+    "texture-compression-astc",
+    "timestamp-query",
+    "indirect-first-instance",
+};
+
+// Device
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUDevice: EventTarget {
+    [SameObject] readonly attribute GPUSupportedFeatures features;
+    [SameObject] readonly attribute GPUSupportedLimits limits;
+
+    // Overriding the name to avoid collision with `class Queue` in gcc
+    [SameObject, BinaryName="getQueue"] readonly attribute GPUQueue queue;
+
+    undefined destroy();
+
+    [NewObject, Throws]
+    GPUBuffer createBuffer(GPUBufferDescriptor descriptor);
+    [NewObject]
+    GPUTexture createTexture(GPUTextureDescriptor descriptor);
+    [NewObject]
+    GPUSampler createSampler(optional GPUSamplerDescriptor descriptor = {});
+
+    GPUBindGroupLayout createBindGroupLayout(GPUBindGroupLayoutDescriptor descriptor);
+    GPUPipelineLayout createPipelineLayout(GPUPipelineLayoutDescriptor descriptor);
+    GPUBindGroup createBindGroup(GPUBindGroupDescriptor descriptor);
+
+    GPUShaderModule createShaderModule(GPUShaderModuleDescriptor descriptor);
+    GPUComputePipeline createComputePipeline(GPUComputePipelineDescriptor descriptor);
+    GPURenderPipeline createRenderPipeline(GPURenderPipelineDescriptor descriptor);
+
+    [NewObject]
+    Promise<GPUComputePipeline> createComputePipelineAsync(GPUComputePipelineDescriptor descriptor);
+    [NewObject]
+    Promise<GPURenderPipeline> createRenderPipelineAsync(GPURenderPipelineDescriptor descriptor);
+
+    [NewObject]
+    GPUCommandEncoder createCommandEncoder(optional GPUCommandEncoderDescriptor descriptor = {});
+    [NewObject]
+    GPURenderBundleEncoder createRenderBundleEncoder(GPURenderBundleEncoderDescriptor descriptor);
+    //[NewObject]
+    //GPUQuerySet createQuerySet(GPUQuerySetDescriptor descriptor);
+};
+GPUDevice includes GPUObjectBase;
+
+// Buffer
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUBuffer {
+    // TODO: s/unsigned long long/GPUSize64/: https://github.com/gpuweb/gpuweb/issues/4080
+    readonly attribute unsigned long long size;
+    // TODO: s/unsigned long/GPUBufferUsageFlags/: https://github.com/gpuweb/gpuweb/issues/4080
+    readonly attribute unsigned long usage;
+
+    readonly attribute GPUBufferMapState mapState;
+
+    [NewObject]
+    Promise<undefined> mapAsync(GPUMapModeFlags mode, optional GPUSize64 offset = 0, optional GPUSize64 size);
+    [NewObject, Throws]
+    ArrayBuffer getMappedRange(optional GPUSize64 offset = 0, optional GPUSize64 size);
+    [Throws]
+    undefined unmap();
+
+    [Throws]
+    undefined destroy();
+};
+GPUBuffer includes GPUObjectBase;
+
+enum GPUBufferMapState {
+    "unmapped",
+    "pending",
+    "mapped"
+};
+
+dictionary GPUBufferDescriptor : GPUObjectDescriptorBase {
+    required GPUSize64 size;
+    required GPUBufferUsageFlags usage;
+    boolean mappedAtCreation = false;
+};
+
+typedef [EnforceRange] unsigned long GPUBufferUsageFlags;
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUBufferUsage {
+    const GPUBufferUsageFlags MAP_READ      = 0x0001;
+    const GPUBufferUsageFlags MAP_WRITE     = 0x0002;
+    const GPUBufferUsageFlags COPY_SRC      = 0x0004;
+    const GPUBufferUsageFlags COPY_DST      = 0x0008;
+    const GPUBufferUsageFlags INDEX         = 0x0010;
+    const GPUBufferUsageFlags VERTEX        = 0x0020;
+    const GPUBufferUsageFlags UNIFORM       = 0x0040;
+    const GPUBufferUsageFlags STORAGE       = 0x0080;
+    const GPUBufferUsageFlags INDIRECT      = 0x0100;
+    const GPUBufferUsageFlags QUERY_RESOLVE = 0x0200;
+};
+
+typedef [EnforceRange] unsigned long GPUMapModeFlags;
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUMapMode
+ {
+    const GPUMapModeFlags READ  = 0x0001;
+    const GPUMapModeFlags WRITE = 0x0002;
+};
+
+typedef sequence<any> GPUMappedBuffer;
+
+// Texture
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUTexture {
+    [NewObject]
+    GPUTextureView createView(optional GPUTextureViewDescriptor descriptor = {});
+
+    undefined destroy();
+
+    // TODO: s/unsigned long/GPUIntegerCoordinate: https://github.com/gpuweb/gpuweb/issues/4080
+    readonly attribute unsigned long width;
+    readonly attribute unsigned long height;
+    readonly attribute unsigned long depthOrArrayLayers;
+    readonly attribute unsigned long mipLevelCount;
+    // TODO: s/unsigned long/GPUSize32: https://github.com/gpuweb/gpuweb/issues/4080
+    readonly attribute unsigned long sampleCount;
+    readonly attribute GPUTextureDimension dimension;
+    readonly attribute GPUTextureFormat format;
+    // TODO: s/unsigned long/GPUSize32: https://github.com/gpuweb/gpuweb/issues/4080
+    readonly attribute unsigned long usage;
+};
+GPUTexture includes GPUObjectBase;
+
+dictionary GPUTextureDescriptor : GPUObjectDescriptorBase {
+    required GPUExtent3D size;
+    GPUIntegerCoordinate mipLevelCount = 1;
+    GPUSize32 sampleCount = 1;
+    GPUTextureDimension dimension = "2d";
+    required GPUTextureFormat format;
+    required GPUTextureUsageFlags usage;
+};
+
+enum GPUTextureDimension {
+    "1d",
+    "2d",
+    "3d",
+};
+
+typedef [EnforceRange] unsigned long GPUTextureUsageFlags;
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUTextureUsage {
+    const GPUTextureUsageFlags COPY_SRC          = 0x01;
+    const GPUTextureUsageFlags COPY_DST          = 0x02;
+    const GPUTextureUsageFlags TEXTURE_BINDING   = 0x04;
+    const GPUTextureUsageFlags STORAGE_BINDING   = 0x08;
+    const GPUTextureUsageFlags RENDER_ATTACHMENT = 0x10;
+};
+
+enum GPUTextureComponentType {
+    "float",
+    "sint",
+    "uint",
+    "depth-comparison"
+};
+
+// Texture view
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUTextureView {
+};
+GPUTextureView includes GPUObjectBase;
+
+dictionary GPUTextureViewDescriptor : GPUObjectDescriptorBase {
+    GPUTextureFormat format;
+    GPUTextureViewDimension dimension;
+    GPUTextureAspect aspect = "all";
+    GPUIntegerCoordinate baseMipLevel = 0;
+    GPUIntegerCoordinate mipLevelCount;
+    GPUIntegerCoordinate baseArrayLayer = 0;
+    GPUIntegerCoordinate arrayLayerCount;
+};
+
+enum GPUTextureViewDimension {
+    "1d",
+    "2d",
+    "2d-array",
+    "cube",
+    "cube-array",
+    "3d"
+};
+
+enum GPUTextureAspect {
+    "all",
+    "stencil-only",
+    "depth-only"
+};
+
+enum GPUTextureFormat {
+    // 8-bit formats
+    "r8unorm",
+    "r8snorm",
+    "r8uint",
+    "r8sint",
+
+    // 16-bit formats
+    "r16uint",
+    "r16sint",
+    "r16float",
+    "rg8unorm",
+    "rg8snorm",
+    "rg8uint",
+    "rg8sint",
+
+    // 32-bit formats
+    "r32uint",
+    "r32sint",
+    "r32float",
+    "rg16uint",
+    "rg16sint",
+    "rg16float",
+    "rgba8unorm",
+    "rgba8unorm-srgb",
+    "rgba8snorm",
+    "rgba8uint",
+    "rgba8sint",
+    "bgra8unorm",
+    "bgra8unorm-srgb",
+
+    // Packed 32-bit formats
+    "rgb9e5ufloat",
+    "rgb10a2unorm",
+    "rg11b10float",
+
+    // 64-bit formats
+    "rg32uint",
+    "rg32sint",
+    "rg32float",
+    "rgba16uint",
+    "rgba16sint",
+    "rgba16float",
+
+    // 128-bit formats
+    "rgba32uint",
+    "rgba32sint",
+    "rgba32float",
+
+    // Depth and stencil formats
+    //"stencil8", //TODO
+    //"depth16unorm",
+    "depth24plus",
+    "depth24plus-stencil8",
+    "depth32float",
+
+    // "depth32float-stencil8" feature
+    "depth32float-stencil8",
+
+    // BC compressed formats usable if "texture-compression-bc" is both
+    // supported by the device/user agent and enabled in requestDevice.
+    "bc1-rgba-unorm",
+    "bc1-rgba-unorm-srgb",
+    "bc2-rgba-unorm",
+    "bc2-rgba-unorm-srgb",
+    "bc3-rgba-unorm",
+    "bc3-rgba-unorm-srgb",
+    "bc4-r-unorm",
+    "bc4-r-snorm",
+    "bc5-rg-unorm",
+    "bc5-rg-snorm",
+    "bc6h-rgb-ufloat",
+    "bc6h-rgb-float",
+    "bc7-rgba-unorm",
+    "bc7-rgba-unorm-srgb",
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUSampler {
+};
+GPUSampler includes GPUObjectBase;
+
+dictionary GPUSamplerDescriptor : GPUObjectDescriptorBase {
+    GPUAddressMode addressModeU = "clamp-to-edge";
+    GPUAddressMode addressModeV = "clamp-to-edge";
+    GPUAddressMode addressModeW = "clamp-to-edge";
+    GPUFilterMode magFilter = "nearest";
+    GPUFilterMode minFilter = "nearest";
+    GPUFilterMode mipmapFilter = "nearest";
+    float lodMinClamp = 0;
+    float lodMaxClamp = 1000.0; // TODO: What should this be?
+    GPUCompareFunction compare;
+    [Clamp] unsigned short maxAnisotropy = 1;
+};
+
+// Sampler
+enum GPUAddressMode {
+    "clamp-to-edge",
+    "repeat",
+    "mirror-repeat"
+};
+
+enum GPUFilterMode {
+    "nearest",
+    "linear",
+};
+
+enum GPUCompareFunction {
+    "never",
+    "less",
+    "equal",
+    "less-equal",
+    "greater",
+    "not-equal",
+    "greater-equal",
+    "always"
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUBindGroupLayout {
+};
+GPUBindGroupLayout includes GPUObjectBase;
+
+dictionary GPUBindGroupLayoutDescriptor : GPUObjectDescriptorBase {
+    required sequence<GPUBindGroupLayoutEntry> entries;
+};
+
+dictionary GPUBindGroupLayoutEntry {
+    required GPUIndex32 binding;
+    required GPUShaderStageFlags visibility;
+    GPUBufferBindingLayout buffer;
+    GPUSamplerBindingLayout sampler;
+    GPUTextureBindingLayout texture;
+    GPUStorageTextureBindingLayout storageTexture;
+};
+
+typedef [EnforceRange] unsigned long GPUShaderStageFlags;
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUShaderStage {
+    const GPUShaderStageFlags VERTEX = 1;
+    const GPUShaderStageFlags FRAGMENT = 2;
+    const GPUShaderStageFlags COMPUTE = 4;
+};
+
+enum GPUBufferBindingType {
+    "uniform",
+    "storage",
+    "read-only-storage",
+};
+
+dictionary GPUBufferBindingLayout {
+    GPUBufferBindingType type = "uniform";
+    boolean hasDynamicOffset = false;
+    GPUSize64 minBindingSize = 0;
+};
+
+enum GPUSamplerBindingType {
+    "filtering",
+    "non-filtering",
+    "comparison",
+};
+
+dictionary GPUSamplerBindingLayout {
+    GPUSamplerBindingType type = "filtering";
+};
+
+enum GPUTextureSampleType {
+  "float",
+  "unfilterable-float",
+  "depth",
+  "sint",
+  "uint",
+};
+
+dictionary GPUTextureBindingLayout {
+    GPUTextureSampleType sampleType = "float";
+    GPUTextureViewDimension viewDimension = "2d";
+    boolean multisampled = false;
+};
+
+enum GPUStorageTextureAccess {
+    "write-only",
+};
+
+dictionary GPUStorageTextureBindingLayout {
+    GPUStorageTextureAccess access = "write-only";
+    required GPUTextureFormat format;
+    GPUTextureViewDimension viewDimension = "2d";
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUBindGroup {
+};
+GPUBindGroup includes GPUObjectBase;
+
+dictionary GPUBindGroupDescriptor : GPUObjectDescriptorBase {
+    required GPUBindGroupLayout layout;
+    required sequence<GPUBindGroupEntry> entries;
+};
+
+typedef (GPUSampler or GPUTextureView or GPUBufferBinding) GPUBindingResource;
+
+dictionary GPUBindGroupEntry {
+    required GPUIndex32 binding;
+    required GPUBindingResource resource;
+};
+
+dictionary GPUBufferBinding {
+    required GPUBuffer buffer;
+    GPUSize64 offset = 0;
+    GPUSize64 size;
+};
+
+// PipelineLayout
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUPipelineLayout {
+};
+GPUPipelineLayout includes GPUObjectBase;
+
+dictionary GPUPipelineLayoutDescriptor : GPUObjectDescriptorBase {
+    required sequence<GPUBindGroupLayout> bindGroupLayouts;
+};
+
+// ShaderModule
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUShaderModule {
+    [Throws]
+    Promise<GPUCompilationInfo> compilationInfo();
+};
+GPUShaderModule includes GPUObjectBase;
+
+dictionary GPUShaderModuleDescriptor : GPUObjectDescriptorBase {
+    // UTF8String is not observably different from USVString
+    required UTF8String code;
+    object sourceMap;
+};
+
+enum GPUCompilationMessageType {
+    "error",
+    "warning",
+    "info"
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUCompilationMessage {
+    readonly attribute DOMString message;
+    readonly attribute GPUCompilationMessageType type;
+    readonly attribute unsigned long long lineNum;
+    readonly attribute unsigned long long linePos;
+    readonly attribute unsigned long long offset;
+    readonly attribute unsigned long long length;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUCompilationInfo {
+    [Cached, Frozen, Pure]
+    readonly attribute sequence<GPUCompilationMessage> messages;
+};
+
+enum GPUAutoLayoutMode {
+    "auto"
+};
+
+dictionary GPUPipelineDescriptorBase : GPUObjectDescriptorBase {
+    required (GPUPipelineLayout or GPUAutoLayoutMode) layout;
+};
+
+interface mixin GPUPipelineBase {
+    GPUBindGroupLayout getBindGroupLayout(unsigned long index);
+};
+
+dictionary GPUProgrammableStage {
+    required GPUShaderModule module;
+    required USVString entryPoint;
+};
+
+//TODO: Serializable
+// https://bugzilla.mozilla.org/show_bug.cgi?id=1696219
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUComputePipeline {
+};
+GPUComputePipeline includes GPUObjectBase;
+GPUComputePipeline includes GPUPipelineBase;
+
+// ComputePipeline
+dictionary GPUComputePipelineDescriptor : GPUPipelineDescriptorBase {
+    required GPUProgrammableStage compute;
+};
+
+//TODO: Serializable
+// https://bugzilla.mozilla.org/show_bug.cgi?id=1696219
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPURenderPipeline {
+};
+GPURenderPipeline includes GPUObjectBase;
+GPURenderPipeline includes GPUPipelineBase;
+
+dictionary GPURenderPipelineDescriptor : GPUPipelineDescriptorBase {
+    required GPUVertexState vertex;
+    GPUPrimitiveState primitive = {};
+    GPUDepthStencilState depthStencil;
+    GPUMultisampleState multisample = {};
+    GPUFragmentState fragment;
+};
+
+dictionary GPUPrimitiveState {
+    GPUPrimitiveTopology topology = "triangle-list";
+    GPUIndexFormat stripIndexFormat;
+    GPUFrontFace frontFace = "ccw";
+    GPUCullMode cullMode = "none";
+    // Enable depth clamping (requires "depth-clamping" feature)
+    boolean clampDepth = false;
+};
+
+enum GPUPrimitiveTopology {
+    "point-list",
+    "line-list",
+    "line-strip",
+    "triangle-list",
+    "triangle-strip"
+};
+
+enum GPUFrontFace {
+    "ccw",
+    "cw"
+};
+
+enum GPUCullMode {
+    "none",
+    "front",
+    "back"
+};
+
+dictionary GPUMultisampleState {
+    GPUSize32 count = 1;
+    GPUSampleMask mask = 0xFFFFFFFF;
+    boolean alphaToCoverageEnabled = false;
+};
+
+dictionary GPUFragmentState: GPUProgrammableStage {
+    required sequence<GPUColorTargetState> targets;
+};
+
+dictionary GPUColorTargetState {
+    required GPUTextureFormat format;
+    GPUBlendState blend;
+    GPUColorWriteFlags writeMask = 0xF;  // GPUColorWrite.ALL
+};
+
+dictionary GPUBlendState {
+    required GPUBlendComponent color;
+    required GPUBlendComponent alpha;
+};
+
+typedef [EnforceRange] unsigned long GPUColorWriteFlags;
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUColorWrite {
+    const GPUColorWriteFlags RED    = 0x1;
+    const GPUColorWriteFlags GREEN  = 0x2;
+    const GPUColorWriteFlags BLUE   = 0x4;
+    const GPUColorWriteFlags ALPHA  = 0x8;
+    const GPUColorWriteFlags ALL    = 0xF;
+};
+
+dictionary GPUBlendComponent {
+    GPUBlendFactor srcFactor = "one";
+    GPUBlendFactor dstFactor = "zero";
+    GPUBlendOperation operation = "add";
+};
+
+enum GPUBlendFactor {
+    "zero",
+    "one",
+    "src",
+    "one-minus-src",
+    "src-alpha",
+    "one-minus-src-alpha",
+    "dst",
+    "one-minus-dst",
+    "dst-alpha",
+    "one-minus-dst-alpha",
+    "src-alpha-saturated",
+    "constant",
+    "one-minus-constant",
+};
+
+enum GPUBlendOperation {
+    "add",
+    "subtract",
+    "reverse-subtract",
+    "min",
+    "max"
+};
+
+dictionary GPUDepthStencilState {
+    required GPUTextureFormat format;
+
+    boolean depthWriteEnabled = false;
+    GPUCompareFunction depthCompare = "always";
+
+    GPUStencilFaceState stencilFront = {};
+    GPUStencilFaceState stencilBack = {};
+
+    GPUStencilValue stencilReadMask = 0xFFFFFFFF;
+    GPUStencilValue stencilWriteMask = 0xFFFFFFFF;
+
+    GPUDepthBias depthBias = 0;
+    float depthBiasSlopeScale = 0;
+    float depthBiasClamp = 0;
+};
+
+dictionary GPUStencilFaceState {
+    GPUCompareFunction compare = "always";
+    GPUStencilOperation failOp = "keep";
+    GPUStencilOperation depthFailOp = "keep";
+    GPUStencilOperation passOp = "keep";
+};
+
+enum GPUStencilOperation {
+    "keep",
+    "zero",
+    "replace",
+    "invert",
+    "increment-clamp",
+    "decrement-clamp",
+    "increment-wrap",
+    "decrement-wrap"
+};
+
+enum GPUIndexFormat {
+    "uint16",
+    "uint32",
+};
+
+enum GPUVertexFormat {
+    "uint8x2",
+    "uint8x4",
+    "sint8x2",
+    "sint8x4",
+    "unorm8x2",
+    "unorm8x4",
+    "snorm8x2",
+    "snorm8x4",
+    "uint16x2",
+    "uint16x4",
+    "sint16x2",
+    "sint16x4",
+    "unorm16x2",
+    "unorm16x4",
+    "snorm16x2",
+    "snorm16x4",
+    "float16x2",
+    "float16x4",
+    "float32",
+    "float32x2",
+    "float32x3",
+    "float32x4",
+    "uint32",
+    "uint32x2",
+    "uint32x3",
+    "uint32x4",
+    "sint32",
+    "sint32x2",
+    "sint32x3",
+    "sint32x4",
+};
+
+enum GPUVertexStepMode {
+    "vertex",
+    "instance",
+};
+
+dictionary GPUVertexState: GPUProgrammableStage {
+    sequence<GPUVertexBufferLayout?> buffers = [];
+};
+
+dictionary GPUVertexBufferLayout {
+    required GPUSize64 arrayStride;
+    GPUVertexStepMode stepMode = "vertex";
+    required sequence<GPUVertexAttribute> attributes;
+};
+
+dictionary GPUVertexAttribute {
+    required GPUVertexFormat format;
+    required GPUSize64 offset;
+    required GPUIndex32 shaderLocation;
+};
+
+dictionary GPUImageDataLayout {
+    GPUSize64 offset = 0;
+    GPUSize32 bytesPerRow;
+    GPUSize32 rowsPerImage;
+};
+
+dictionary GPUImageCopyBuffer : GPUImageDataLayout {
+    required GPUBuffer buffer;
+};
+
+dictionary GPUImageCopyExternalImage {
+    required (ImageBitmap or HTMLCanvasElement or OffscreenCanvas) source;
+    GPUOrigin2D origin = {};
+    boolean flipY = false;
+};
+
+dictionary GPUImageCopyTexture {
+    required GPUTexture texture;
+    GPUIntegerCoordinate mipLevel = 0;
+    GPUOrigin3D origin;
+    GPUTextureAspect aspect = "all";
+};
+
+dictionary GPUImageCopyTextureTagged : GPUImageCopyTexture {
+    //GPUPredefinedColorSpace colorSpace = "srgb"; //TODO
+    boolean premultipliedAlpha = false;
+};
+
+dictionary GPUImageBitmapCopyView {
+    //required ImageBitmap imageBitmap; //TODO
+    GPUOrigin2D origin;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUCommandBuffer {
+};
+GPUCommandBuffer includes GPUObjectBase;
+
+// Command Buffer
+dictionary GPUCommandBufferDescriptor : GPUObjectDescriptorBase {
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUCommandEncoder {
+    [NewObject]
+    GPUComputePassEncoder beginComputePass(optional GPUComputePassDescriptor descriptor = {});
+    [NewObject]
+    GPURenderPassEncoder beginRenderPass(GPURenderPassDescriptor descriptor);
+
+    undefined copyBufferToBuffer(
+        GPUBuffer source,
+        GPUSize64 sourceOffset,
+        GPUBuffer destination,
+        GPUSize64 destinationOffset,
+        GPUSize64 size);
+
+    undefined copyBufferToTexture(
+        GPUImageCopyBuffer source,
+        GPUImageCopyTexture destination,
+        GPUExtent3D copySize);
+
+    undefined copyTextureToBuffer(
+        GPUImageCopyTexture source,
+        GPUImageCopyBuffer destination,
+        GPUExtent3D copySize);
+
+    undefined copyTextureToTexture(
+        GPUImageCopyTexture source,
+        GPUImageCopyTexture destination,
+        GPUExtent3D copySize);
+
+    /*
+    undefined copyImageBitmapToTexture(
+        GPUImageBitmapCopyView source,
+        GPUImageCopyTexture destination,
+        GPUExtent3D copySize);
+    */
+
+    undefined pushDebugGroup(USVString groupLabel);
+    undefined popDebugGroup();
+    undefined insertDebugMarker(USVString markerLabel);
+
+    [NewObject]
+    GPUCommandBuffer finish(optional GPUCommandBufferDescriptor descriptor = {});
+};
+GPUCommandEncoder includes GPUObjectBase;
+
+dictionary GPUCommandEncoderDescriptor : GPUObjectDescriptorBase {
+};
+
+interface mixin GPUProgrammablePassEncoder {
+    undefined setBindGroup(GPUIndex32 index, GPUBindGroup bindGroup,
+                           optional sequence<GPUBufferDynamicOffset> dynamicOffsets = []);
+
+    undefined pushDebugGroup(USVString groupLabel);
+    undefined popDebugGroup();
+    undefined insertDebugMarker(USVString markerLabel);
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUComputePassEncoder {
+    undefined setPipeline(GPUComputePipeline pipeline);
+    undefined dispatchWorkgroups(GPUSize32 x, optional GPUSize32 y = 1, optional GPUSize32 z = 1);
+    [Pref="dom.webgpu.indirect-dispatch.enabled"]
+    undefined dispatchWorkgroupsIndirect(GPUBuffer indirectBuffer, GPUSize64 indirectOffset);
+
+    [Throws]
+    undefined end();
+};
+GPUComputePassEncoder includes GPUObjectBase;
+GPUComputePassEncoder includes GPUProgrammablePassEncoder;
+
+dictionary GPUComputePassDescriptor : GPUObjectDescriptorBase {
+};
+
+interface mixin GPURenderEncoderBase {
+    undefined setPipeline(GPURenderPipeline pipeline);
+
+    undefined setIndexBuffer(GPUBuffer buffer, GPUIndexFormat indexFormat, optional GPUSize64 offset = 0, optional GPUSize64 size = 0);
+    undefined setVertexBuffer(GPUIndex32 slot, GPUBuffer buffer, optional GPUSize64 offset = 0, optional GPUSize64 size = 0);
+
+    undefined draw(GPUSize32 vertexCount,
+                   optional GPUSize32 instanceCount = 1,
+                   optional GPUSize32 firstVertex = 0,
+                   optional GPUSize32 firstInstance = 0);
+    undefined drawIndexed(GPUSize32 indexCount,
+                          optional GPUSize32 instanceCount = 1,
+                          optional GPUSize32 firstIndex = 0,
+                          optional GPUSignedOffset32 baseVertex = 0,
+                          optional GPUSize32 firstInstance = 0);
+
+    [Pref="dom.webgpu.indirect-dispatch.enabled"]
+    undefined drawIndirect(GPUBuffer indirectBuffer, GPUSize64 indirectOffset);
+    [Pref="dom.webgpu.indirect-dispatch.enabled"]
+    undefined drawIndexedIndirect(GPUBuffer indirectBuffer, GPUSize64 indirectOffset);
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPURenderPassEncoder {
+    undefined setViewport(float x, float y,
+                          float width, float height,
+                          float minDepth, float maxDepth);
+
+    undefined setScissorRect(GPUIntegerCoordinate x, GPUIntegerCoordinate y,
+                             GPUIntegerCoordinate width, GPUIntegerCoordinate height);
+
+    undefined setBlendConstant(GPUColor color);
+    undefined setStencilReference(GPUStencilValue reference);
+
+    //undefined beginOcclusionQuery(GPUSize32 queryIndex);
+    //undefined endOcclusionQuery();
+
+    //undefined beginPipelineStatisticsQuery(GPUQuerySet querySet, GPUSize32 queryIndex);
+    //undefined endPipelineStatisticsQuery();
+
+    //undefined writeTimestamp(GPUQuerySet querySet, GPUSize32 queryIndex);
+
+    undefined executeBundles(sequence<GPURenderBundle> bundles);
+
+    [Throws]
+    undefined end();
+};
+GPURenderPassEncoder includes GPUObjectBase;
+GPURenderPassEncoder includes GPUProgrammablePassEncoder;
+GPURenderPassEncoder includes GPURenderEncoderBase;
+
+dictionary GPURenderPassDescriptor : GPUObjectDescriptorBase {
+    required sequence<GPURenderPassColorAttachment> colorAttachments;
+    GPURenderPassDepthStencilAttachment depthStencilAttachment;
+    GPUQuerySet occlusionQuerySet;
+};
+
+dictionary GPURenderPassColorAttachment {
+    required GPUTextureView view;
+    GPUTextureView resolveTarget;
+
+    GPUColor clearValue;
+    required GPULoadOp loadOp;
+    required GPUStoreOp storeOp;
+};
+
+dictionary GPURenderPassDepthStencilAttachment {
+    required GPUTextureView view;
+
+    float depthClearValue;
+    GPULoadOp depthLoadOp;
+    GPUStoreOp depthStoreOp;
+    boolean depthReadOnly = false;
+
+    GPUStencilValue stencilClearValue = 0;
+    GPULoadOp stencilLoadOp;
+    GPUStoreOp stencilStoreOp;
+    boolean stencilReadOnly = false;
+};
+
+enum GPULoadOp {
+    "load",
+    "clear"
+};
+
+enum GPUStoreOp {
+    "store",
+    "discard"
+};
+
+dictionary GPURenderPassLayout: GPUObjectDescriptorBase {
+    required sequence<GPUTextureFormat> colorFormats;
+    GPUTextureFormat depthStencilFormat;
+    GPUSize32 sampleCount = 1;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPURenderBundle {
+};
+GPURenderBundle includes GPUObjectBase;
+
+dictionary GPURenderBundleDescriptor : GPUObjectDescriptorBase {
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPURenderBundleEncoder {
+    GPURenderBundle finish(optional GPURenderBundleDescriptor descriptor = {});
+};
+GPURenderBundleEncoder includes GPUObjectBase;
+GPURenderBundleEncoder includes GPUProgrammablePassEncoder;
+GPURenderBundleEncoder includes GPURenderEncoderBase;
+
+dictionary GPURenderBundleEncoderDescriptor : GPURenderPassLayout {
+    boolean depthReadOnly = false;
+    boolean stencilReadOnly = false;
+};
+
+//TODO: use [AllowShared] on BufferSource
+// https://bugzilla.mozilla.org/show_bug.cgi?id=1696216
+// https://github.com/heycam/webidl/issues/961
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUQueue {
+    undefined submit(sequence<GPUCommandBuffer> buffers);
+
+    //TODO:
+    //Promise<undefined> onSubmittedWorkDone();
+
+    [Throws]
+    undefined writeBuffer(
+        GPUBuffer buffer,
+        GPUSize64 bufferOffset,
+        BufferSource data,
+        optional GPUSize64 dataOffset = 0,
+        optional GPUSize64 size);
+
+    [Throws]
+    undefined writeTexture(
+      GPUImageCopyTexture destination,
+      BufferSource data,
+      GPUImageDataLayout dataLayout,
+      GPUExtent3D size);
+
+    [Throws]
+    undefined copyExternalImageToTexture(
+      GPUImageCopyExternalImage source,
+      GPUImageCopyTextureTagged destination,
+      GPUExtent3D copySize);
+};
+GPUQueue includes GPUObjectBase;
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUQuerySet {
+    undefined destroy();
+};
+GPUQuerySet includes GPUObjectBase;
+
+dictionary GPUQuerySetDescriptor : GPUObjectDescriptorBase {
+    required GPUQueryType type;
+    required GPUSize32 count;
+    sequence<GPUPipelineStatisticName> pipelineStatistics = [];
+};
+
+enum GPUPipelineStatisticName {
+    "vertex-shader-invocations",
+    "clipper-invocations",
+    "clipper-primitives-out",
+    "fragment-shader-invocations",
+    "compute-shader-invocations"
+};
+
+enum GPUQueryType {
+    "occlusion",
+    "pipeline-statistics",
+    "timestamp"
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUCanvasContext {
+    readonly attribute (HTMLCanvasElement or OffscreenCanvas) canvas;
+
+    // Calling configure() a second time invalidates the previous one,
+    // and all of the textures it's produced.
+    undefined configure(GPUCanvasConfiguration descriptor);
+    undefined unconfigure();
+
+    [Throws]
+    GPUTexture getCurrentTexture();
+};
+
+enum GPUCanvasCompositingAlphaMode {
+    "opaque",
+    "premultiplied",
+};
+
+dictionary GPUCanvasConfiguration {
+    required GPUDevice device;
+    required GPUTextureFormat format;
+    GPUTextureUsageFlags usage = 0x10; //GPUTextureUsage.OUTPUT_ATTACHMENT
+    //GPUPredefinedColorSpace colorSpace = "srgb"; //TODO
+    GPUCanvasCompositingAlphaMode compositingAlphaMode = "opaque";
+};
+
+enum GPUDeviceLostReason {
+    "destroyed",
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUDeviceLostInfo {
+    readonly attribute any reason; // GPUDeviceLostReason or undefined
+    readonly attribute DOMString message;
+};
+
+partial interface GPUDevice {
+    [Throws]
+    readonly attribute Promise<GPUDeviceLostInfo> lost;
+    undefined pushErrorScope(GPUErrorFilter filter);
+    [NewObject]
+    Promise<GPUError?> popErrorScope();
+    [Exposed=(Window /* ,DedicatedWorker */)]
+    attribute EventHandler onuncapturederror;
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUOutOfMemoryError {
+    //constructor();
+};
+
+[Pref="dom.webgpu.enabled",
+ Exposed=(Window /* ,DedicatedWorker */), SecureContext]
+interface GPUValidationError {
+    [Throws]
+    constructor(DOMString message);
+    readonly attribute DOMString message;
+};
+
+typedef (GPUOutOfMemoryError or GPUValidationError) GPUError;
+
+enum GPUErrorFilter {
+    "out-of-memory",
+    "validation"
+};
+
+typedef [EnforceRange] unsigned long GPUBufferDynamicOffset;
+typedef [EnforceRange] unsigned long GPUStencilValue;
+typedef [EnforceRange] unsigned long GPUSampleMask;
+typedef [EnforceRange] long GPUDepthBias;
+
+typedef [EnforceRange] unsigned long long GPUSize64;
+typedef [EnforceRange] unsigned long GPUIntegerCoordinate;
+typedef [EnforceRange] unsigned long GPUIndex32;
+typedef [EnforceRange] unsigned long GPUSize32;
+typedef [EnforceRange] long GPUSignedOffset32;
+
+dictionary GPUColorDict {
+    required double r;
+    required double g;
+    required double b;
+    required double a;
+};
+typedef (sequence<double> or GPUColorDict) GPUColor;
+
+dictionary GPUOrigin2DDict {
+    GPUIntegerCoordinate x = 0;
+    GPUIntegerCoordinate y = 0;
+};
+typedef (sequence<GPUIntegerCoordinate> or GPUOrigin2DDict) GPUOrigin2D;
+
+dictionary GPUOrigin3DDict {
+    GPUIntegerCoordinate x = 0;
+    GPUIntegerCoordinate y = 0;
+    GPUIntegerCoordinate z = 0;
+};
+typedef (sequence<GPUIntegerCoordinate> or GPUOrigin3DDict) GPUOrigin3D;
+
+dictionary GPUExtent3DDict {
+    required GPUIntegerCoordinate width;
+    GPUIntegerCoordinate height = 1;
+    GPUIntegerCoordinate depthOrArrayLayers = 1;
+};
+typedef (sequence<GPUIntegerCoordinate> or GPUExtent3DDict) GPUExtent3D;
diff --git a/dom/webidl/WebSocket.webidl b/dom/webidl/WebSocket.webidl
new file mode 100644
index 0000000000..90d0da38e7
--- /dev/null
+++ b/dom/webidl/WebSocket.webidl
@@ -0,0 +1,76 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/html/#network
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of this document.
+ */
+
+enum BinaryType { "blob", "arraybuffer" };
+
+[Exposed=(Window,Worker)]
+interface WebSocket : EventTarget {
+  [Throws]
+  constructor(DOMString url, optional (DOMString or sequence<DOMString>) protocols = []);
+
+  readonly attribute DOMString url;
+
+  // ready state
+  const unsigned short CONNECTING = 0;
+  const unsigned short OPEN = 1;
+  const unsigned short CLOSING = 2;
+  const unsigned short CLOSED = 3;
+
+  readonly attribute unsigned short readyState;
+
+  readonly attribute unsigned long long bufferedAmount;
+
+  // networking
+
+  attribute EventHandler onopen;
+
+  attribute EventHandler onerror;
+
+  attribute EventHandler onclose;
+
+  readonly attribute DOMString extensions;
+
+  readonly attribute DOMString protocol;
+
+  [Throws]
+  undefined close(optional [Clamp] unsigned short code, optional DOMString reason);
+
+  // messaging
+
+  attribute EventHandler onmessage;
+
+  attribute BinaryType binaryType;
+
+  [Throws]
+  undefined send(DOMString data);
+
+  [Throws]
+  undefined send(Blob data);
+
+  [Throws]
+  undefined send(ArrayBuffer data);
+
+  [Throws]
+  undefined send(ArrayBufferView data);
+};
+
+// Support for creating server-side chrome-only WebSocket. Used in
+// devtools remote debugging server.
+interface nsITransportProvider;
+
+partial interface WebSocket {
+  [ChromeOnly, NewObject, Throws]
+  static WebSocket createServerWebSocket(DOMString url,
+                                         sequence<DOMString> protocols,
+                                         nsITransportProvider transportProvider,
+                                         DOMString negotiatedExtensions);
+};
diff --git a/dom/webidl/WebTaskScheduling.webidl b/dom/webidl/WebTaskScheduling.webidl
new file mode 100644
index 0000000000..727484aa3f
--- /dev/null
+++ b/dom/webidl/WebTaskScheduling.webidl
@@ -0,0 +1,43 @@
+enum TaskPriority {
+  "user-blocking",
+  "user-visible",
+  "background"
+};
+
+[Exposed=(Window, Worker), Pref="dom.enable_web_task_scheduling"]
+interface TaskSignal : AbortSignal {
+  readonly attribute TaskPriority priority;
+
+  attribute EventHandler onprioritychange;
+};
+
+
+dictionary SchedulerPostTaskOptions {
+  AbortSignal signal;
+  TaskPriority priority;
+  [EnforceRange] unsigned long long delay = 0;
+};
+
+callback SchedulerPostTaskCallback = any ();
+
+[Exposed=(Window, Worker), Pref="dom.enable_web_task_scheduling"]
+interface Scheduler {
+  [UseCounter]
+  Promise<any> postTask(
+    SchedulerPostTaskCallback callback,
+    optional SchedulerPostTaskOptions options = {}
+  );
+};
+
+dictionary TaskControllerInit {
+  TaskPriority priority = "user-visible";
+};
+
+[Exposed=(Window,Worker), Pref="dom.enable_web_task_scheduling"]
+interface TaskController : AbortController {
+  [Throws]
+  constructor(optional TaskControllerInit init = {});
+
+  [Throws]
+  undefined setPriority(TaskPriority priority);
+};
diff --git a/dom/webidl/WebTransport.webidl b/dom/webidl/WebTransport.webidl
new file mode 100644
index 0000000000..338249b817
--- /dev/null
+++ b/dom/webidl/WebTransport.webidl
@@ -0,0 +1,102 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* https://w3c.github.io/webtransport */
+
+/* https://w3c.github.io/webtransport/#web-transport-configuration */
+
+dictionary WebTransportHash {
+  DOMString algorithm;
+  BufferSource value;
+};
+
+dictionary WebTransportOptions {
+  boolean allowPooling = false;
+  boolean requireUnreliable = false;
+  sequence<WebTransportHash> serverCertificateHashes;
+  WebTransportCongestionControl congestionControl = "default";
+};
+
+enum WebTransportCongestionControl {
+  "default",
+  "throughput",
+  "low-latency",
+};
+
+/* https://w3c.github.io/webtransport/#web-transport-close-info */
+
+dictionary WebTransportCloseInfo {
+  unsigned long closeCode = 0;
+  UTF8String reason = "";
+};
+
+/* https://w3c.github.io/webtransport/#uni-stream-options */
+dictionary WebTransportSendStreamOptions {
+  long long? sendOrder = null;
+};
+
+/* https://w3c.github.io/webtransport/#web-transport-stats */
+
+dictionary WebTransportStats {
+  DOMHighResTimeStamp timestamp;
+  unsigned long long bytesSent;
+  unsigned long long packetsSent;
+  unsigned long long packetsLost;
+  unsigned long numOutgoingStreamsCreated;
+  unsigned long numIncomingStreamsCreated;
+  unsigned long long bytesReceived;
+  unsigned long long packetsReceived;
+  DOMHighResTimeStamp smoothedRtt;
+  DOMHighResTimeStamp rttVariation;
+  DOMHighResTimeStamp minRtt;
+  WebTransportDatagramStats datagrams;
+};
+
+/* https://w3c.github.io/webtransport/#web-transport-stats%E2%91%A0 */
+
+dictionary WebTransportDatagramStats {
+  DOMHighResTimeStamp timestamp;
+  unsigned long long expiredOutgoing;
+  unsigned long long droppedIncoming;
+  unsigned long long lostOutgoing;
+};
+
+/* https://w3c.github.io/webtransport/#web-transport */
+
+[Exposed=(Window,Worker), SecureContext, Pref="network.webtransport.enabled"]
+interface WebTransport {
+  [Throws]
+  constructor(USVString url, optional WebTransportOptions options = {});
+
+  [NewObject]
+  Promise<WebTransportStats> getStats();
+  readonly attribute Promise<undefined> ready;
+  readonly attribute WebTransportReliabilityMode reliability;
+  readonly attribute WebTransportCongestionControl congestionControl;
+  readonly attribute Promise<WebTransportCloseInfo> closed;
+  [Throws] undefined close(optional WebTransportCloseInfo closeInfo = {});
+
+  [Throws] readonly attribute WebTransportDatagramDuplexStream datagrams;
+
+  [NewObject]
+  Promise<WebTransportBidirectionalStream> createBidirectionalStream(
+     optional WebTransportSendStreamOptions options = {});
+  /* a ReadableStream of WebTransportBidirectionalStream objects */
+  readonly attribute ReadableStream incomingBidirectionalStreams;
+
+
+  /* XXX spec says this should be WebTransportSendStream */
+  [NewObject]
+  Promise<WritableStream> createUnidirectionalStream(
+    optional WebTransportSendStreamOptions options = {});
+  /* a ReadableStream of WebTransportReceiveStream objects */
+  readonly attribute ReadableStream incomingUnidirectionalStreams;
+};
+
+enum WebTransportReliabilityMode {
+  "pending",
+  "reliable-only",
+  "supports-unreliable",
+};
diff --git a/dom/webidl/WebTransportDatagramDuplexStream.webidl b/dom/webidl/WebTransportDatagramDuplexStream.webidl
new file mode 100644
index 0000000000..b7998b7cb5
--- /dev/null
+++ b/dom/webidl/WebTransportDatagramDuplexStream.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* https://w3c.github.io/webtransport/#duplex-stream */
+
+[Exposed=(Window,Worker), SecureContext, Pref="network.webtransport.datagrams.enabled"]
+interface WebTransportDatagramDuplexStream {
+  readonly attribute ReadableStream readable;
+  readonly attribute WritableStream writable;
+
+  readonly attribute unsigned long maxDatagramSize;
+  [Throws] attribute unrestricted double incomingMaxAge;
+  [Throws] attribute unrestricted double outgoingMaxAge;
+  [Throws] attribute unrestricted double incomingHighWaterMark;
+  [Throws] attribute unrestricted double outgoingHighWaterMark;
+};
diff --git a/dom/webidl/WebTransportError.webidl b/dom/webidl/WebTransportError.webidl
new file mode 100644
index 0000000000..1484d65bf4
--- /dev/null
+++ b/dom/webidl/WebTransportError.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* https://w3c.github.io/webtransport/#web-transport-error-interface */
+
+[Exposed=(Window,Worker), SecureContext, Pref="network.webtransport.enabled"]
+interface WebTransportError : DOMException {
+  constructor(optional WebTransportErrorInit init = {});
+
+  readonly attribute WebTransportErrorSource source;
+  readonly attribute octet? streamErrorCode;
+};
+
+dictionary WebTransportErrorInit {
+  [Clamp] octet streamErrorCode;
+  DOMString message;
+};
+
+enum WebTransportErrorSource {
+  "stream",
+  "session",
+};
diff --git a/dom/webidl/WebTransportSendReceiveStream.webidl b/dom/webidl/WebTransportSendReceiveStream.webidl
new file mode 100644
index 0000000000..9acafc02f2
--- /dev/null
+++ b/dom/webidl/WebTransportSendReceiveStream.webidl
@@ -0,0 +1,44 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* https://w3c.github.io/webtransport/#send-stream */
+
+
+[Exposed=(Window,Worker), SecureContext, Pref="network.webtransport.enabled"]
+interface WebTransportSendStream : WritableStream {
+  Promise<WebTransportSendStreamStats> getStats();
+};
+
+/* https://w3c.github.io/webtransport/#send-stream-stats */
+
+dictionary WebTransportSendStreamStats {
+  DOMHighResTimeStamp timestamp;
+  unsigned long long bytesWritten;
+  unsigned long long bytesSent;
+  unsigned long long bytesAcknowledged;
+};
+
+/* https://w3c.github.io/webtransport/#receive-stream */
+
+[Exposed=(Window,Worker), SecureContext, Pref="network.webtransport.enabled"]
+interface WebTransportReceiveStream : ReadableStream {
+  Promise<WebTransportReceiveStreamStats> getStats();
+};
+
+/* https://w3c.github.io/webtransport/#receive-stream-stats */
+
+dictionary WebTransportReceiveStreamStats {
+  DOMHighResTimeStamp timestamp;
+  unsigned long long bytesReceived;
+  unsigned long long bytesRead;
+};
+
+/* https://w3c.github.io/webtransport/#bidirectional-stream */
+
+[Exposed=(Window,Worker), SecureContext, Pref="network.webtransport.enabled"]
+interface WebTransportBidirectionalStream {
+  readonly attribute WebTransportReceiveStream readable;
+  readonly attribute WebTransportSendStream writable;
+};
diff --git a/dom/webidl/WebXR.webidl b/dom/webidl/WebXR.webidl
new file mode 100644
index 0000000000..302c82156a
--- /dev/null
+++ b/dom/webidl/WebXR.webidl
@@ -0,0 +1,241 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://immersive-web.github.io/webxr/
+ */
+
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRSystem : EventTarget {
+  // Methods
+  [NewObject]
+  Promise<boolean> isSessionSupported(XRSessionMode mode);
+  [NewObject, NeedsCallerType]
+  Promise<XRSession> requestSession(XRSessionMode mode, optional XRSessionInit options = {});
+
+  // Events
+  attribute EventHandler ondevicechange;
+};
+
+enum XRSessionMode {
+  "inline",
+  "immersive-vr",
+  "immersive-ar",
+};
+
+dictionary XRSessionInit {
+  sequence<any> requiredFeatures;
+  sequence<any> optionalFeatures;
+};
+
+enum XRVisibilityState {
+  "visible",
+  "visible-blurred",
+  "hidden",
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRSession : EventTarget {
+  // Attributes
+  readonly attribute XRVisibilityState visibilityState;
+  [SameObject] readonly attribute XRRenderState renderState;
+  [SameObject] readonly attribute XRInputSourceArray inputSources;
+  readonly attribute float? frameRate;
+  readonly attribute Float32Array? supportedFrameRates;
+
+  // Methods
+  [Throws]
+  undefined updateRenderState(optional XRRenderStateInit state = {});
+  [NewObject]
+  Promise<XRReferenceSpace> requestReferenceSpace(XRReferenceSpaceType type);
+  [NewObject]
+  Promise<undefined> updateTargetFrameRate(float rate);
+
+  [Throws]
+  long requestAnimationFrame(XRFrameRequestCallback callback);
+  [Throws]
+  undefined cancelAnimationFrame(long handle);
+
+  [NewObject]
+  Promise<undefined> end();
+
+  // Events
+  attribute EventHandler onend;
+  attribute EventHandler oninputsourceschange;
+  attribute EventHandler onselect;
+  attribute EventHandler onselectstart;
+  attribute EventHandler onselectend;
+  attribute EventHandler onsqueeze;
+  attribute EventHandler onsqueezestart;
+  attribute EventHandler onsqueezeend;
+  attribute EventHandler onvisibilitychange;
+};
+
+dictionary XRRenderStateInit {
+  double depthNear;
+  double depthFar;
+  double inlineVerticalFieldOfView;
+  XRWebGLLayer? baseLayer;
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRRenderState {
+  readonly attribute double depthNear;
+  readonly attribute double depthFar;
+  readonly attribute double? inlineVerticalFieldOfView;
+  readonly attribute XRWebGLLayer? baseLayer;
+};
+
+callback XRFrameRequestCallback = undefined (DOMHighResTimeStamp time, XRFrame frame);
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRFrame {
+  [SameObject] readonly attribute XRSession session;
+
+  [Throws] XRViewerPose? getViewerPose(XRReferenceSpace referenceSpace);
+  [Throws] XRPose? getPose(XRSpace space, XRSpace baseSpace);
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRSpace : EventTarget {
+
+};
+
+enum XRReferenceSpaceType {
+  "viewer",
+  "local",
+  "local-floor",
+  "bounded-floor",
+  "unbounded"
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRReferenceSpace : XRSpace {
+  [NewObject]
+  XRReferenceSpace getOffsetReferenceSpace(XRRigidTransform originOffset);
+
+  attribute EventHandler onreset;
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRBoundedReferenceSpace : XRReferenceSpace {
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  [Frozen, Cached, Pure]
+  readonly attribute sequence<DOMPointReadOnly> boundsGeometry;
+};
+
+enum XREye {
+  "none",
+  "left",
+  "right"
+};
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRView {
+  readonly attribute XREye eye;
+  [Throws]
+  readonly attribute Float32Array projectionMatrix;
+  [Throws, SameObject]
+  readonly attribute XRRigidTransform transform;
+};
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRViewport {
+  readonly attribute long x;
+  readonly attribute long y;
+  readonly attribute long width;
+  readonly attribute long height;
+};
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRRigidTransform {
+  [Throws]
+  constructor(optional DOMPointInit position = {}, optional DOMPointInit orientation = {});
+  [SameObject] readonly attribute DOMPointReadOnly position;
+  [SameObject] readonly attribute DOMPointReadOnly orientation;
+  [Throws]
+  readonly attribute Float32Array matrix;
+  [SameObject] readonly attribute XRRigidTransform inverse;
+};
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRPose {
+  [SameObject] readonly attribute XRRigidTransform transform;
+  readonly attribute boolean emulatedPosition;
+};
+
+[ProbablyShortLivingWrapper, Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRViewerPose : XRPose {
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  [Constant, Cached, Frozen]
+  readonly attribute sequence<XRView> views;
+};
+
+enum XRHandedness {
+  "none",
+  "left",
+  "right"
+};
+
+enum XRTargetRayMode {
+  "gaze",
+  "tracked-pointer",
+  "screen"
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRInputSource {
+  readonly attribute XRHandedness handedness;
+  readonly attribute XRTargetRayMode targetRayMode;
+  [SameObject] readonly attribute XRSpace targetRaySpace;
+  [SameObject] readonly attribute XRSpace? gripSpace;
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  [Constant, Cached, Frozen]
+  readonly attribute sequence<DOMString> profiles;
+  // https://immersive-web.github.io/webxr-gamepads-module/
+  [SameObject] readonly attribute Gamepad? gamepad;
+};
+
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRInputSourceArray {
+  iterable<XRInputSource>;
+  readonly attribute unsigned long length;
+  getter XRInputSource(unsigned long index);
+};
+
+typedef (WebGLRenderingContext or
+         WebGL2RenderingContext) XRWebGLRenderingContext;
+
+dictionary XRWebGLLayerInit {
+  boolean antialias = true;
+  boolean depth = true;
+  boolean stencil = false;
+  boolean alpha = true;
+  boolean ignoreDepthValues = false;
+  double framebufferScaleFactor = 1.0;
+};
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRWebGLLayer {
+  [Throws]
+  constructor(XRSession session,
+              XRWebGLRenderingContext context,
+              optional XRWebGLLayerInit layerInit = {});
+  // Attributes
+  readonly attribute boolean antialias;
+  readonly attribute boolean ignoreDepthValues;
+
+  [SameObject] readonly attribute WebGLFramebuffer? framebuffer;
+  readonly attribute unsigned long framebufferWidth;
+  readonly attribute unsigned long framebufferHeight;
+
+  // Methods
+  XRViewport? getViewport(XRView view);
+
+  // Static Methods
+  static double getNativeFramebufferScaleFactor(XRSession session);
+};
diff --git a/dom/webidl/WebrtcGlobalInformation.webidl b/dom/webidl/WebrtcGlobalInformation.webidl
new file mode 100644
index 0000000000..50769aef00
--- /dev/null
+++ b/dom/webidl/WebrtcGlobalInformation.webidl
@@ -0,0 +1,52 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary WebrtcGlobalStatisticsReport {
+  sequence<RTCStatsReportInternal> reports = [];
+  sequence<RTCSdpHistoryInternal> sdpHistories = [];
+};
+
+callback WebrtcGlobalStatisticsCallback = undefined (WebrtcGlobalStatisticsReport reports);
+callback WebrtcGlobalStatisticsHistoryPcIdsCallback = undefined (sequence<DOMString> pcIds);
+callback WebrtcGlobalStatisticsHistoryCallback = undefined (WebrtcGlobalStatisticsReport reports);
+callback WebrtcGlobalLoggingCallback = undefined (sequence<DOMString> logMessages);
+
+[ChromeOnly, Exposed=Window]
+namespace WebrtcGlobalInformation {
+
+  [Throws]
+  undefined getAllStats(WebrtcGlobalStatisticsCallback callback,
+                        optional DOMString pcIdFilter);
+
+  [Throws]
+  undefined getStatsHistoryPcIds(WebrtcGlobalStatisticsHistoryPcIdsCallback callback);
+
+  [Throws]
+  undefined getStatsHistorySince(WebrtcGlobalStatisticsHistoryCallback callback,
+                                 DOMString pcIdFilter,
+                                 optional DOMHighResTimeStamp after,
+                                 optional DOMHighResTimeStamp sdpAfter);
+
+  undefined clearAllStats();
+
+  [Throws]
+  undefined getLogging(DOMString pattern, WebrtcGlobalLoggingCallback callback);
+
+  undefined clearLogging();
+
+  // NSPR WebRTC Trace debug level (0 - 65535)
+  //
+  // Notes:
+  // - Setting a non-zero debug level turns on gathering of log for file output.
+  // - Subsequently setting a zero debug level writes that log to disk.
+
+  attribute long debugLevel;
+
+  // WebRTC AEC debugging enable
+  attribute boolean aecDebug;
+
+  readonly attribute DOMString aecDebugLogDir;
+};
diff --git a/dom/webidl/WheelEvent.webidl b/dom/webidl/WheelEvent.webidl
new file mode 100644
index 0000000000..67357581da
--- /dev/null
+++ b/dom/webidl/WheelEvent.webidl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+interface WheelEvent : MouseEvent
+{
+  constructor(DOMString type, optional WheelEventInit eventInitDict = {});
+
+  const unsigned long DOM_DELTA_PIXEL = 0x00;
+  const unsigned long DOM_DELTA_LINE  = 0x01;
+  const unsigned long DOM_DELTA_PAGE  = 0x02;
+
+  // Legacy MouseWheelEvent API replaced by standard WheelEvent API.
+  [NeedsCallerType]
+  readonly attribute long wheelDeltaX;
+  [NeedsCallerType]
+  readonly attribute long wheelDeltaY;
+  [NeedsCallerType]
+  readonly attribute long wheelDelta;
+
+  [NeedsCallerType] readonly attribute double        deltaX;
+  [NeedsCallerType] readonly attribute double        deltaY;
+  [NeedsCallerType] readonly attribute double        deltaZ;
+  [NeedsCallerType] readonly attribute unsigned long deltaMode;
+};
+
+dictionary WheelEventInit : MouseEventInit
+{
+  double deltaX = 0;
+  double deltaY = 0;
+  double deltaZ = 0;
+  unsigned long deltaMode = 0;
+};
diff --git a/dom/webidl/WidevineCDMManifest.webidl b/dom/webidl/WidevineCDMManifest.webidl
new file mode 100644
index 0000000000..c741db8408
--- /dev/null
+++ b/dom/webidl/WidevineCDMManifest.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[GenerateInitFromJSON]
+dictionary WidevineCDMManifest {
+  required DOMString name;
+  required DOMString description;
+  required DOMString version;
+  required DOMString x-cdm-module-versions;
+  required DOMString x-cdm-interface-versions;
+  required DOMString x-cdm-host-versions;
+  required DOMString x-cdm-codecs;
+};
diff --git a/dom/webidl/Window.webidl b/dom/webidl/Window.webidl
new file mode 100644
index 0000000000..1bee8ab8de
--- /dev/null
+++ b/dom/webidl/Window.webidl
@@ -0,0 +1,845 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * http://www.whatwg.org/specs/web-apps/current-work/
+ * https://dvcs.w3.org/hg/editing/raw-file/tip/editing.html
+ * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html
+ * http://dev.w3.org/csswg/cssom/
+ * http://dev.w3.org/csswg/cssom-view/
+ * https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/RequestAnimationFrame/Overview.html
+ * https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/NavigationTiming/Overview.html
+ * https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ * https://w3c.github.io/webappsec-secure-contexts/#monkey-patching-global-object
+ * https://w3c.github.io/requestidlecallback/
+ * https://drafts.css-houdini.org/css-paint-api-1/#dom-window-paintworklet
+ * https://wicg.github.io/visual-viewport/#the-visualviewport-interface
+ */
+
+interface Principal;
+interface nsIBrowserDOMWindow;
+interface XULControllers;
+interface nsIDOMWindowUtils;
+interface nsIPrintSettings;
+
+// http://www.whatwg.org/specs/web-apps/current-work/
+[Global, LegacyUnenumerableNamedProperties, NeedResolve,
+ Exposed=Window,
+ InstrumentedProps=(AbsoluteOrientationSensor,
+                    Accelerometer,
+                    Atomics,
+                    AudioParamMap,
+                    AudioWorklet,
+                    AudioWorkletNode,
+                    BackgroundFetchManager,
+                    BackgroundFetchRecord,
+                    BackgroundFetchRegistration,
+                    BeforeInstallPromptEvent,
+                    Bluetooth,
+                    BluetoothCharacteristicProperties,
+                    BluetoothDevice,
+                    BluetoothRemoteGATTCharacteristic,
+                    BluetoothRemoteGATTDescriptor,
+                    BluetoothRemoteGATTServer,
+                    BluetoothRemoteGATTService,
+                    BluetoothUUID,
+                    CanvasCaptureMediaStreamTrack,
+                    chrome,
+                    clientInformation,
+                    ClipboardItem,
+                    CSSImageValue,
+                    CSSKeywordValue,
+                    CSSMathInvert,
+                    CSSMathMax,
+                    CSSMathMin,
+                    CSSMathNegate,
+                    CSSMathProduct,
+                    CSSMathSum,
+                    CSSMathValue,
+                    CSSMatrixComponent,
+                    CSSNumericArray,
+                    CSSNumericValue,
+                    CSSPerspective,
+                    CSSPositionValue,
+                    CSSRotate,
+                    CSSScale,
+                    CSSSkew,
+                    CSSSkewX,
+                    CSSSkewY,
+                    CSSStyleValue,
+                    CSSTransformComponent,
+                    CSSTransformValue,
+                    CSSTranslate,
+                    CSSUnitValue,
+                    CSSUnparsedValue,
+                    CSSVariableReferenceValue,
+                    defaultStatus,
+                    // Unfortunately, our telemetry histogram name generator
+                    // (the one that generates TelemetryHistogramEnums.h) can't
+                    // handle two DOM methods with names that only differ in
+                    // case, because it forces everything to uppercase.
+                    //defaultstatus,
+                    DeviceMotionEventAcceleration,
+                    DeviceMotionEventRotationRate,
+                    DOMError,
+                    EnterPictureInPictureEvent,
+                    External,
+                    FederatedCredential,
+                    Gyroscope,
+                    HTMLContentElement,
+                    HTMLDialogElement,
+                    HTMLShadowElement,
+                    ImageCapture,
+                    InputDeviceCapabilities,
+                    InputDeviceInfo,
+                    Keyboard,
+                    KeyboardLayoutMap,
+                    LinearAccelerationSensor,
+                    Lock,
+                    LockManager,
+                    MediaMetadata,
+                    MediaSession,
+                    MediaSettingsRange,
+                    MIDIAccess,
+                    MIDIConnectionEvent,
+                    MIDIInput,
+                    MIDIInputMap,
+                    MIDIMessageEvent,
+                    MIDIOutput,
+                    MIDIOutputMap,
+                    MIDIPort,
+                    NavigationPreloadManager,
+                    NetworkInformation,
+                    offscreenBuffering,
+                    OffscreenCanvas,
+                    OffscreenCanvasRenderingContext2D,
+                    onbeforeinstallprompt,
+                    oncancel,
+                    onmousewheel,
+                    onsearch,
+                    onselectionchange,
+                    openDatabase,
+                    OrientationSensor,
+                    OverconstrainedError,
+                    PasswordCredential,
+                    PaymentAddress,
+                    PaymentInstruments,
+                    PaymentManager,
+                    PaymentMethodChangeEvent,
+                    PaymentRequest,
+                    PaymentRequestUpdateEvent,
+                    PaymentResponse,
+                    PerformanceEventTiming,
+                    PerformanceLongTaskTiming,
+                    PerformancePaintTiming,
+                    PhotoCapabilities,
+                    PictureInPictureWindow,
+                    Presentation,
+                    PresentationAvailability,
+                    PresentationConnection,
+                    PresentationConnectionAvailableEvent,
+                    PresentationConnectionCloseEvent,
+                    PresentationConnectionList,
+                    PresentationReceiver,
+                    PresentationRequest,
+                    RelativeOrientationSensor,
+                    RemotePlayback,
+                    ReportingObserver,
+                    RTCDtlsTransport,
+                    RTCError,
+                    RTCErrorEvent,
+                    RTCIceTransport,
+                    RTCSctpTransport,
+                    Sensor,
+                    SensorErrorEvent,
+                    SharedArrayBuffer,
+                    styleMedia,
+                    StylePropertyMap,
+                    StylePropertyMapReadOnly,
+                    SVGDiscardElement,
+                    SyncManager,
+                    TaskAttributionTiming,
+                    TextDecoderStream,
+                    TextEncoderStream,
+                    TextEvent,
+                    Touch,
+                    TouchEvent,
+                    TouchList,
+                    TransformStream,
+                    USB,
+                    USBAlternateInterface,
+                    USBConfiguration,
+                    USBConnectionEvent,
+                    USBDevice,
+                    USBEndpoint,
+                    USBInterface,
+                    USBInTransferResult,
+                    USBIsochronousInTransferPacket,
+                    USBIsochronousInTransferResult,
+                    USBIsochronousOutTransferPacket,
+                    USBIsochronousOutTransferResult,
+                    USBOutTransferResult,
+                    UserActivation,
+                    visualViewport,
+                    webkitCancelAnimationFrame,
+                    webkitMediaStream,
+                    WebKitMutationObserver,
+                    webkitRequestAnimationFrame,
+                    webkitRequestFileSystem,
+                    webkitResolveLocalFileSystemURL,
+                    webkitRTCPeerConnection,
+                    webkitSpeechGrammar,
+                    webkitSpeechGrammarList,
+                    webkitSpeechRecognition,
+                    webkitSpeechRecognitionError,
+                    webkitSpeechRecognitionEvent,
+                    webkitStorageInfo,
+                    Worklet,
+                    WritableStream)]
+/*sealed*/ interface Window : EventTarget {
+  // the current browsing context
+  [LegacyUnforgeable, Constant, StoreInSlot,
+   CrossOriginReadable] readonly attribute WindowProxy window;
+  [Replaceable, Constant, StoreInSlot,
+   CrossOriginReadable] readonly attribute WindowProxy self;
+  [LegacyUnforgeable, StoreInSlot, Pure] readonly attribute Document? document;
+  [Throws] attribute DOMString name;
+  [PutForwards=href, LegacyUnforgeable, CrossOriginReadable,
+   CrossOriginWritable] readonly attribute Location location;
+  [Throws] readonly attribute History history;
+  readonly attribute CustomElementRegistry customElements;
+  [Replaceable, Throws] readonly attribute BarProp locationbar;
+  [Replaceable, Throws] readonly attribute BarProp menubar;
+  [Replaceable, Throws] readonly attribute BarProp personalbar;
+  [Replaceable, Throws] readonly attribute BarProp scrollbars;
+  [Replaceable, Throws] readonly attribute BarProp statusbar;
+  [Replaceable, Throws] readonly attribute BarProp toolbar;
+  [Throws] attribute DOMString status;
+  [Throws, CrossOriginCallable, NeedsCallerType] undefined close();
+  [Throws, CrossOriginReadable] readonly attribute boolean closed;
+  [Throws] undefined stop();
+  [Throws, CrossOriginCallable, NeedsCallerType] undefined focus();
+  [Throws, CrossOriginCallable, NeedsCallerType] undefined blur();
+  [Replaceable, Pref="dom.window.event.enabled"] readonly attribute (Event or undefined) event;
+
+  // other browsing contexts
+  [Replaceable, Throws, CrossOriginReadable] readonly attribute WindowProxy frames;
+  [Replaceable, CrossOriginReadable] readonly attribute unsigned long length;
+  //[Unforgeable, Throws, CrossOriginReadable] readonly attribute WindowProxy top;
+  [LegacyUnforgeable, Throws, CrossOriginReadable] readonly attribute WindowProxy? top;
+  [Throws, CrossOriginReadable] attribute any opener;
+  //[Throws] readonly attribute WindowProxy parent;
+  [Replaceable, Throws, CrossOriginReadable] readonly attribute WindowProxy? parent;
+  [Throws, NeedsSubjectPrincipal] readonly attribute Element? frameElement;
+  //[Throws] WindowProxy? open(optional USVString url = "about:blank", optional DOMString target = "_blank", [TreatNullAs=EmptyString] optional DOMString features = "");
+  [Throws] WindowProxy? open(optional USVString url = "", optional DOMString target = "", optional [LegacyNullToEmptyString] DOMString features = "");
+  getter object (DOMString name);
+
+  // the user agent
+  readonly attribute Navigator navigator;
+  [Pref="dom.window.clientinformation.enabled", BinaryName="Navigator"]
+  readonly attribute Navigator clientInformation;
+
+  [Replaceable] readonly attribute External external;
+
+  // user prompts
+  [Throws, NeedsSubjectPrincipal] undefined alert();
+  [Throws, NeedsSubjectPrincipal] undefined alert(DOMString message);
+  [Throws, NeedsSubjectPrincipal] boolean confirm(optional DOMString message = "");
+  [Throws, NeedsSubjectPrincipal] DOMString? prompt(optional DOMString message = "", optional DOMString default = "");
+  [Throws, Pref="dom.enable_window_print"]
+  undefined print();
+
+  // Returns a window that you can use for a print preview.
+  //
+  // This may reuse an existing window if this window is already a print
+  // preview document, or if you pass a docshell explicitly.
+  [Throws, Func="nsContentUtils::IsCallerChromeOrFuzzingEnabled"]
+  WindowProxy? printPreview(optional nsIPrintSettings? settings = null,
+                            optional nsIWebProgressListener? listener = null,
+                            optional nsIDocShell? docShellToPreviewInto = null);
+
+  [Throws, CrossOriginCallable, NeedsSubjectPrincipal,
+   BinaryName="postMessageMoz"]
+  undefined postMessage(any message, DOMString targetOrigin, optional sequence<object> transfer = []);
+  [Throws, CrossOriginCallable, NeedsSubjectPrincipal,
+   BinaryName="postMessageMoz"]
+  undefined postMessage(any message, optional WindowPostMessageOptions options = {});
+
+  // also has obsolete members
+};
+Window includes GlobalEventHandlers;
+Window includes WindowEventHandlers;
+
+// http://www.whatwg.org/specs/web-apps/current-work/
+interface mixin WindowSessionStorage {
+  //[Throws] readonly attribute Storage sessionStorage;
+  [Throws] readonly attribute Storage? sessionStorage;
+};
+Window includes WindowSessionStorage;
+
+// http://www.whatwg.org/specs/web-apps/current-work/
+interface mixin WindowLocalStorage {
+  [Throws] readonly attribute Storage? localStorage;
+};
+Window includes WindowLocalStorage;
+
+// http://www.whatwg.org/specs/web-apps/current-work/
+partial interface Window {
+  undefined captureEvents();
+  undefined releaseEvents();
+};
+
+// https://dvcs.w3.org/hg/editing/raw-file/tip/editing.html
+partial interface Window {
+  //[Throws] Selection getSelection();
+  [Throws] Selection? getSelection();
+};
+
+// https://drafts.csswg.org/cssom/#extensions-to-the-window-interface
+partial interface Window {
+  //[NewObject, Throws] CSSStyleDeclaration getComputedStyle(Element elt, optional DOMString? pseudoElt = "");
+  [NewObject, Throws] CSSStyleDeclaration? getComputedStyle(Element elt, optional DOMString? pseudoElt = "");
+};
+
+// http://dev.w3.org/csswg/cssom-view/
+enum ScrollBehavior { "auto", "instant", "smooth" };
+
+dictionary ScrollOptions {
+  ScrollBehavior behavior = "auto";
+};
+
+dictionary ScrollToOptions : ScrollOptions {
+  unrestricted double left;
+  unrestricted double top;
+};
+
+partial interface Window {
+  //[Throws, NewObject, NeedsCallerType] MediaQueryList matchMedia(DOMString query);
+  [Throws, NewObject, NeedsCallerType] MediaQueryList? matchMedia(UTF8String query);
+  // Per spec, screen is SameObject, but we don't actually guarantee that given
+  // nsGlobalWindow::Cleanup.  :(
+  //[SameObject, Replaceable, Throws] readonly attribute Screen screen;
+  [Replaceable, Throws] readonly attribute Screen screen;
+
+  // browsing context
+  //[Throws] undefined moveTo(double x, double y);
+  //[Throws] undefined moveBy(double x, double y);
+  //[Throws] undefined resizeTo(double x, double y);
+  //[Throws] undefined resizeBy(double x, double y);
+  [Throws, NeedsCallerType] undefined moveTo(long x, long y);
+  [Throws, NeedsCallerType] undefined moveBy(long x, long y);
+  [Throws, NeedsCallerType] undefined resizeTo(long x, long y);
+  [Throws, NeedsCallerType] undefined resizeBy(long x, long y);
+
+  // viewport
+  // These are writable because we allow chrome to write them.  And they need
+  // to use 'any' as the type, because non-chrome writing them needs to act
+  // like a [Replaceable] attribute would, which needs the original JS value.
+  // TODO: These can be updated to follow the spec exactly a while after we
+  // enable dom.window_position_size_properties_replaceable.enabled=true
+  //[Replaceable, Throws] readonly attribute double innerWidth;
+  //[Replaceable, Throws] readonly attribute double innerHeight;
+  [Throws, NeedsCallerType] attribute any innerWidth;
+  [Throws, NeedsCallerType] attribute any innerHeight;
+
+  // viewport scrolling
+  undefined scroll(unrestricted double x, unrestricted double y);
+  undefined scroll(optional ScrollToOptions options = {});
+  undefined scrollTo(unrestricted double x, unrestricted double y);
+  undefined scrollTo(optional ScrollToOptions options = {});
+  undefined scrollBy(unrestricted double x, unrestricted double y);
+  undefined scrollBy(optional ScrollToOptions options = {});
+  // mozScrollSnap is used by chrome to perform scroll snapping after the
+  // user performs actions that may affect scroll position
+  // mozScrollSnap is deprecated, to be replaced by a web accessible API, such
+  // as an extension to the ScrollOptions dictionary.  See bug 1137937.
+  [ChromeOnly] undefined mozScrollSnap();
+  // The four properties below are double per spec at the moment, but whether
+  // that will continue is unclear.
+  [Replaceable, Throws] readonly attribute double scrollX;
+  [Replaceable, Throws] readonly attribute double pageXOffset;
+  [Replaceable, Throws] readonly attribute double scrollY;
+  [Replaceable, Throws] readonly attribute double pageYOffset;
+
+  // Aliases for screenX / screenY.
+  [Replaceable, Throws, NeedsCallerType] readonly attribute double screenLeft;
+  [Replaceable, Throws, NeedsCallerType] readonly attribute double screenTop;
+
+  // client
+  // These are writable because we allow chrome to write them.  And they need
+  // to use 'any' as the type, because non-chrome writing them needs to act
+  // like a [Replaceable] attribute would, which needs the original JS value.
+  // TODO: These can be updated to follow the spec exactly a while after we
+  // enable dom.window_position_size_properties_replaceable.enabled=true
+  //[Replaceable, Throws] readonly attribute double screenX;
+  //[Replaceable, Throws] readonly attribute double screenY;
+  //[Replaceable, Throws] readonly attribute double outerWidth;
+  //[Replaceable, Throws] readonly attribute double outerHeight;
+  [Throws, NeedsCallerType] attribute any screenX;
+  [Throws, NeedsCallerType] attribute any screenY;
+  [Throws, NeedsCallerType] attribute any outerWidth;
+  [Throws, NeedsCallerType] attribute any outerHeight;
+};
+
+// https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#animation-frames
+Window includes AnimationFrameProvider;
+
+// https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/NavigationTiming/Overview.html
+partial interface Window {
+  [Replaceable, Pure, StoreInSlot] readonly attribute Performance? performance;
+};
+
+// https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html
+Window includes GlobalCrypto;
+
+dictionary SizeToContentConstraints {
+  long maxWidth = 0;
+  long maxHeight = 0;
+  long prefWidth = 0;
+};
+
+#ifdef MOZ_WEBSPEECH
+// http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+interface mixin SpeechSynthesisGetter {
+  [Throws, Pref="media.webspeech.synth.enabled"] readonly attribute SpeechSynthesis speechSynthesis;
+};
+
+Window includes SpeechSynthesisGetter;
+#endif
+
+// Mozilla-specific stuff
+partial interface Window {
+  //[NewObject, Throws] CSSStyleDeclaration getDefaultComputedStyle(Element elt, optional DOMString pseudoElt = "");
+  [NewObject, Throws] CSSStyleDeclaration? getDefaultComputedStyle(Element elt, optional DOMString pseudoElt = "");
+
+  // Mozilla extensions
+  /**
+   * Method for scrolling this window by a number of lines.
+   */
+  undefined                 scrollByLines(long numLines, optional ScrollOptions options = {});
+
+  /**
+   * Method for scrolling this window by a number of pages.
+   */
+  undefined                 scrollByPages(long numPages, optional ScrollOptions options = {});
+
+  /**
+   * Method for sizing this window to the content in the window.
+   */
+  [Throws, NeedsCallerType] undefined sizeToContent();
+  /**
+   * Chrome-only method for sizing to content with a maximum-size constraint on
+   * either (or both) directions.
+   */
+  [Throws, ChromeOnly] undefined sizeToContentConstrained(optional SizeToContentConstraints constraints = {});
+
+  // XXX Shouldn't this be in nsIDOMChromeWindow?
+  [ChromeOnly, Replaceable, Throws] readonly attribute XULControllers controllers;
+
+  [ChromeOnly, Throws] readonly attribute Element? realFrameElement;
+
+  [ChromeOnly] readonly attribute nsIDocShell? docShell;
+
+  [ChromeOnly, Constant, CrossOriginReadable, BinaryName="getBrowsingContext"]
+  readonly attribute BrowsingContext browsingContext;
+
+  [Throws, NeedsCallerType]
+  readonly attribute float mozInnerScreenX;
+  [Throws, NeedsCallerType]
+  readonly attribute float mozInnerScreenY;
+  [Replaceable, Throws, NeedsCallerType]
+  readonly attribute double devicePixelRatio;
+
+  // Allows chrome code to convert desktop pixels to device pixels and vice
+  // versa. Useful for interacting with the screen manager.
+  [ChromeOnly, Throws]
+  readonly attribute double desktopToDeviceScale;
+
+  // Returns the amount of CSS pixels relative to this window we're allowed to
+  // go out of the screen. This is needed so that SessionRestore is able to
+  // position windows that use client-side decorations correctly, but still
+  // pull mispositioned windows into the screen.
+  [ChromeOnly]
+  readonly attribute double screenEdgeSlopX;
+  [ChromeOnly]
+  readonly attribute double screenEdgeSlopY;
+
+
+  /* The maximum offset that the window can be scrolled to
+     (i.e., the document width/height minus the scrollport width/height) */
+  [ChromeOnly, Throws]  readonly attribute long   scrollMinX;
+  [ChromeOnly, Throws]  readonly attribute long   scrollMinY;
+  [Replaceable, Throws] readonly attribute long   scrollMaxX;
+  [Replaceable, Throws] readonly attribute long   scrollMaxY;
+
+  [Throws] attribute boolean fullScreen;
+
+  // XXX Should this be in nsIDOMChromeWindow?
+  undefined                 updateCommands(DOMString action,
+                                           optional Selection? sel = null,
+                                           optional short reason = 0);
+
+  /* Find in page.
+   * @param str: the search pattern
+   * @param caseSensitive: is the search caseSensitive
+   * @param backwards: should we search backwards
+   * @param wrapAround: should we wrap the search
+   * @param wholeWord: should we search only for whole words
+   * @param searchInFrames: should we search through all frames
+   * @param showDialog: should we show the Find dialog
+   */
+  [Throws] boolean    find(optional DOMString str = "",
+                           optional boolean caseSensitive = false,
+                           optional boolean backwards = false,
+                           optional boolean wrapAround = false,
+                           optional boolean wholeWord = false,
+                           optional boolean searchInFrames = false,
+                           optional boolean showDialog = false);
+
+           attribute EventHandler ondevicemotion;
+           attribute EventHandler ondeviceorientation;
+           attribute EventHandler ondeviceorientationabsolute;
+           [Pref="device.sensors.proximity.enabled"]
+           attribute EventHandler onuserproximity;
+           [Pref="device.sensors.ambientLight.enabled"]
+           attribute EventHandler ondevicelight;
+
+  undefined                 dump(DOMString str);
+
+  /**
+   * This method is here for backwards compatibility with 4.x only,
+   * its implementation is a no-op
+   */
+  undefined                 setResizable(boolean resizable);
+
+  /**
+   * This is the scriptable version of
+   * nsPIDOMWindow::OpenDialog() that takes 3 optional
+   * arguments, plus any additional arguments are passed on as
+   * arguments on the dialog's window object (window.arguments).
+   */
+  [Throws, ChromeOnly] WindowProxy? openDialog(optional DOMString url = "",
+                                               optional DOMString name = "",
+                                               optional DOMString options = "",
+                                               any... extraArguments);
+
+  [Func="nsGlobalWindowInner::ContentPropertyEnabled",
+   NonEnumerable, Replaceable, Throws, NeedsCallerType]
+  readonly attribute object? content;
+
+  [Throws, ChromeOnly] any getInterface(any iid);
+
+  /**
+   * Same as nsIDOMWindow.windowRoot, useful for event listener targeting.
+   */
+  [ChromeOnly, Throws]
+  readonly attribute WindowRoot? windowRoot;
+
+  /**
+   * ChromeOnly method to determine if a particular window should see console
+   * reports from service workers of the given scope.
+   */
+  [ChromeOnly]
+  boolean shouldReportForServiceWorkerScope(USVString aScope);
+
+  /**
+   * InstallTrigger is used for extension installs.  Ideally it would
+   * be something like a WebIDL namespace, but we don't support
+   * JS-implemented static things yet.  See bug 863952.
+   */
+  [Replaceable, Deprecated="InstallTriggerDeprecated", Pref="extensions.InstallTrigger.enabled"]
+  readonly attribute InstallTriggerImpl? InstallTrigger;
+
+  /**
+   * Get the nsIDOMWindowUtils for this window.
+   */
+  [Constant, Throws, ChromeOnly]
+  readonly attribute nsIDOMWindowUtils windowUtils;
+
+  [Pure, ChromeOnly]
+  readonly attribute WindowGlobalChild? windowGlobalChild;
+
+  /**
+   * The principal of the client source of the window. This is supposed to be
+   * used for the service worker.
+   *
+   * This is used for APIs like https://w3c.github.io/push-api/ that extend
+   * ServiceWorkerRegistration and therefore need to operate consistently with
+   * ServiceWorkers and its Clients API. The client principal is the appropriate
+   * principal to pass to all nsIServiceWorkerManager APIs.
+   *
+   * Note that the client principal will be different from the node principal of
+   * the window's document if the window is in a third-party context when dFPI
+   * is enabled. In this case, the client principal will be the partitioned
+   * principal to support the service worker partitioning.
+   */
+  [ChromeOnly]
+  readonly attribute Principal? clientPrincipal;
+
+  /**
+   *  Whether the chrome window is currently in a full screen transition. This
+   *  flag is updated from FullscreenTransitionTask.
+   *  Always set to false for non-chrome windows.
+   */
+  [ChromeOnly]
+  readonly attribute boolean isInFullScreenTransition;
+};
+
+Window includes TouchEventHandlers;
+
+Window includes OnErrorEventHandlerForWindow;
+
+#if defined(MOZ_WIDGET_ANDROID)
+// https://compat.spec.whatwg.org/#windoworientation-interface
+partial interface Window {
+  [NeedsCallerType]
+  readonly attribute short orientation;
+           attribute EventHandler onorientationchange;
+};
+#endif
+
+// Mozilla extension
+// Sidebar is deprecated and it will be removed in the next cycles. See bug 1640138.
+partial interface Window {
+  [Replaceable, UseCounter, Pref="dom.window.sidebar.enabled"]
+  readonly attribute (External or WindowProxy) sidebar;
+};
+
+[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
+callback PromiseDocumentFlushedCallback = any ();
+
+// Mozilla extensions for Chrome windows.
+partial interface Window {
+  // The STATE_* constants need to match the corresponding enum in nsGlobalWindow.cpp.
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  const unsigned short STATE_MAXIMIZED = 1;
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  const unsigned short STATE_MINIMIZED = 2;
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  const unsigned short STATE_NORMAL = 3;
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  const unsigned short STATE_FULLSCREEN = 4;
+
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  readonly attribute unsigned short windowState;
+
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  readonly attribute boolean isFullyOccluded;
+
+  /**
+   * browserDOMWindow provides access to yet another layer of
+   * utility functions implemented by chrome script. It will be null
+   * for DOMWindows not corresponding to browsers.
+   */
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+           attribute nsIBrowserDOMWindow? browserDOMWindow;
+
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  undefined                 getAttention();
+
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  undefined                 getAttentionWithCycleCount(long aCycleCount);
+
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  undefined                 setCursor(UTF8String cursor);
+
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  undefined                 maximize();
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  undefined                 minimize();
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  undefined                 restore();
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  DOMString                 getWorkspaceID();
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  undefined                 moveToWorkspace(DOMString workspaceID);
+
+  /**
+   * Notify a default button is loaded on a dialog or a wizard.
+   * defaultButton is the default button.
+   */
+  [Throws, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  undefined notifyDefaultButtonLoaded(Element defaultButton);
+
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  readonly attribute ChromeMessageBroadcaster messageManager;
+
+  /**
+   * Returns the message manager identified by the given group name that
+   * manages all frame loaders belonging to that group.
+   */
+  [Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  ChromeMessageBroadcaster getGroupMessageManager(DOMString aGroup);
+
+  /**
+   * Calls the given function as soon as a style or layout flush for the
+   * top-level document is not necessary, and returns a Promise which
+   * resolves to the callback's return value after it executes.
+   *
+   * In the event that the window goes away before a flush can occur, the
+   * callback will still be called and the Promise resolved as the window
+   * tears itself down.
+   *
+   * The callback _must not modify the DOM for any window in any way_. If it
+   * does, after finishing executing, the Promise returned by
+   * promiseDocumentFlushed will reject with
+   * NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR.
+   *
+   * Note that the callback can be called either synchronously or asynchronously
+   * depending on whether or not flushes are pending:
+   *
+   *   The callback will be called synchronously when calling
+   *   promiseDocumentFlushed when NO flushes are already pending. This is
+   *   to ensure that no script has a chance to dirty the DOM before the callback
+   *   is called.
+   *
+   *   The callback will be called asynchronously if a flush is pending.
+   *
+   * The expected execution order is that all pending callbacks will
+   * be fired first (and in the order that they were queued) and then the
+   * Promise resolution handlers will all be invoked later on during the
+   * next microtask checkpoint.
+   *
+   * Using window.top.promiseDocumentFlushed in combination with a callback
+   * that is querying items in a window that might be swapped out via
+   * nsFrameLoader::SwapWithOtherLoader is highly discouraged. For example:
+   *
+   *   let result = await window.top.promiseDocumentFlushed(() => {
+   *     return window.document.body.getBoundingClientRect();
+   *   });
+   *
+   *   If "window" might get swapped out via nsFrameLoader::SwapWithOtherLoader
+   *   at any time, then the callback might get called when the new host window
+   *   will still incur layout flushes, since it's only the original host window
+   *   that's being monitored via window.top.promiseDocumentFlushed.
+   *
+   *   See bug 1519407 for further details.
+   *
+   * promiseDocumentFlushed does not support re-entrancy - so calling it from
+   * within a promiseDocumentFlushed callback will result in the inner call
+   * throwing an NS_ERROR_FAILURE exception, and the outer Promise rejecting
+   * with that exception.
+   *
+   * The callback function *must not make any changes which would require
+   * a style or layout flush*.
+   *
+   * Also throws NS_ERROR_FAILURE if the window is not in a state where flushes
+   * can be waited for (for example, the PresShell has not yet been created).
+   *
+   * @param {function} callback
+   * @returns {Promise}
+   */
+  [NewObject, Func="nsGlobalWindowInner::IsPrivilegedChromeWindow"]
+  Promise<any> promiseDocumentFlushed(PromiseDocumentFlushedCallback callback);
+
+  [Func="IsChromeOrUAWidget"]
+  readonly attribute boolean isChromeWindow;
+
+  [ChromeOnly]
+  readonly attribute GleanImpl Glean;
+  [ChromeOnly]
+  readonly attribute GleanPingsImpl GleanPings;
+};
+
+partial interface Window {
+  [Pref="dom.vr.enabled"]
+  attribute EventHandler onvrdisplayconnect;
+  [Pref="dom.vr.enabled"]
+  attribute EventHandler onvrdisplaydisconnect;
+  [Pref="dom.vr.enabled"]
+  attribute EventHandler onvrdisplayactivate;
+  [Pref="dom.vr.enabled"]
+  attribute EventHandler onvrdisplaydeactivate;
+  [Pref="dom.vr.enabled"]
+  attribute EventHandler onvrdisplaypresentchange;
+};
+
+#ifndef RELEASE_OR_BETA
+// https://drafts.css-houdini.org/css-paint-api-1/#dom-window-paintworklet
+partial interface Window {
+    [Pref="dom.paintWorklet.enabled", Throws]
+    readonly attribute Worklet paintWorklet;
+};
+#endif
+
+Window includes WindowOrWorkerGlobalScope;
+
+partial interface Window {
+  [Throws, Func="nsGlobalWindowInner::IsRequestIdleCallbackEnabled"]
+  unsigned long requestIdleCallback(IdleRequestCallback callback,
+                                    optional IdleRequestOptions options = {});
+  [Func="nsGlobalWindowInner::IsRequestIdleCallbackEnabled"]
+  undefined     cancelIdleCallback(unsigned long handle);
+};
+
+dictionary IdleRequestOptions {
+  unsigned long timeout;
+};
+
+callback IdleRequestCallback = undefined (IdleDeadline deadline);
+
+partial interface Window {
+  /**
+   * Returns a list of locales that the internationalization components
+   * should be localized to.
+   *
+   * The function name refers to Regional Preferences which can be either
+   * fetched from the internal internationalization database (CLDR), or
+   * from the host environment.
+   *
+   * The result is a sorted list of valid locale IDs and it should be
+   * used for all APIs that accept list of locales, like ECMA402 and L10n APIs.
+   *
+   * This API always returns at least one locale.
+   *
+   * Example: ["en-US", "de", "pl", "sr-Cyrl", "zh-Hans-HK"]
+   */
+  [Func="IsChromeOrUAWidget"]
+  sequence<DOMString> getRegionalPrefsLocales();
+
+  /**
+   * Returns a list of locales that the web content would know from the user.
+   *
+   * One of the fingerprinting technique is to recognize users from their locales
+   * exposed to web content. For those components that would be fingerprintable
+   * from the locale should call this API instead of |getRegionalPrefsLocales()|.
+   *
+   * If the pref is set to spoof locale setting, this function will return the
+   * spoofed locale, otherwise it returns what |getRegionalPrefsLocales()| returns.
+   *
+   * This API always returns at least one locale.
+   *
+   * Example: ["en-US"]
+   */
+  [Func="IsChromeOrUAWidget"]
+  sequence<DOMString> getWebExposedLocales();
+
+  /**
+   * Getter funcion for IntlUtils, which provides helper functions for
+   * localization.
+   */
+  [Throws, Func="IsChromeOrUAWidget"]
+  readonly attribute IntlUtils intlUtils;
+};
+
+partial interface Window {
+  [SameObject, Pref="dom.visualviewport.enabled", Replaceable]
+  readonly attribute VisualViewport visualViewport;
+};
+
+// Used to assign marks to appear on the scrollbar when
+// finding on a page.
+partial interface Window {
+  // The marks are values between 0 and scrollMax{X,Y} - scrollMin{X,Y}.
+  [ChromeOnly]
+  undefined setScrollMarks(sequence<unsigned long> marks,
+                           optional boolean onHorizontalScrollbar = false);
+};
+
+dictionary WindowPostMessageOptions : StructuredSerializeOptions {
+  USVString targetOrigin = "/";
+};
diff --git a/dom/webidl/WindowOrWorkerGlobalScope.webidl b/dom/webidl/WindowOrWorkerGlobalScope.webidl
new file mode 100644
index 0000000000..5b5f5c61f6
--- /dev/null
+++ b/dom/webidl/WindowOrWorkerGlobalScope.webidl
@@ -0,0 +1,87 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * https://html.spec.whatwg.org/multipage/webappapis.html#windoworworkerglobalscope-mixin
+ * https://fetch.spec.whatwg.org/#fetch-method
+ * https://w3c.github.io/webappsec-secure-contexts/#monkey-patching-global-object
+ * https://w3c.github.io/ServiceWorker/#self-caches
+ */
+
+// https://html.spec.whatwg.org/multipage/webappapis.html#windoworworkerglobalscope-mixin
+[Exposed=(Window,Worker)]
+interface mixin WindowOrWorkerGlobalScope {
+  [Replaceable] readonly attribute USVString origin;
+  readonly attribute boolean crossOriginIsolated;
+
+  [Throws, NeedsCallerType]
+  undefined reportError(any e);
+
+  // base64 utility methods
+  [Throws]
+  DOMString btoa(DOMString btoa);
+  [Throws]
+  DOMString atob(DOMString atob);
+
+  // timers
+  // NOTE: We're using overloads where the spec uses a union.  Should
+  // be black-box the same.
+  [Throws]
+  long setTimeout(Function handler, optional long timeout = 0, any... arguments);
+  [Throws]
+  long setTimeout(DOMString handler, optional long timeout = 0, any... unused);
+  undefined clearTimeout(optional long handle = 0);
+  [Throws]
+  long setInterval(Function handler, optional long timeout = 0, any... arguments);
+  [Throws]
+  long setInterval(DOMString handler, optional long timeout = 0, any... unused);
+  undefined clearInterval(optional long handle = 0);
+
+  // microtask queuing
+  undefined queueMicrotask(VoidFunction callback);
+
+  // ImageBitmap
+  [Throws]
+  Promise<ImageBitmap> createImageBitmap(ImageBitmapSource aImage,
+                                         optional ImageBitmapOptions aOptions = {});
+  [Throws]
+  Promise<ImageBitmap> createImageBitmap(ImageBitmapSource aImage,
+                                         long aSx, long aSy, long aSw, long aSh,
+                                         optional ImageBitmapOptions aOptions = {});
+
+  // structured cloning
+  [Throws]
+  any structuredClone(any value, optional StructuredSerializeOptions options = {});
+};
+
+// https://fetch.spec.whatwg.org/#fetch-method
+partial interface mixin WindowOrWorkerGlobalScope {
+  [NewObject, NeedsCallerType]
+  Promise<Response> fetch(RequestInfo input, optional RequestInit init = {});
+};
+
+// https://w3c.github.io/webappsec-secure-contexts/#monkey-patching-global-object
+partial interface mixin WindowOrWorkerGlobalScope {
+  readonly attribute boolean isSecureContext;
+};
+
+// http://w3c.github.io/IndexedDB/#factory-interface
+partial interface mixin WindowOrWorkerGlobalScope {
+  // readonly attribute IDBFactory indexedDB; // bug 1776789
+  [Throws]
+  readonly attribute IDBFactory? indexedDB;
+};
+
+// https://w3c.github.io/ServiceWorker/#self-caches
+partial interface mixin WindowOrWorkerGlobalScope {
+  [Throws, Func="nsGlobalWindowInner::CachesEnabled", SameObject]
+  readonly attribute CacheStorage caches;
+};
+
+// https://wicg.github.io/scheduling-apis/#ref-for-windoworworkerglobalscope-scheduler
+partial interface mixin WindowOrWorkerGlobalScope {
+  [Replaceable, Pref="dom.enable_web_task_scheduling", SameObject]
+  readonly attribute Scheduler scheduler;
+};
diff --git a/dom/webidl/WindowRoot.webidl b/dom/webidl/WindowRoot.webidl
new file mode 100644
index 0000000000..71f0bff1dc
--- /dev/null
+++ b/dom/webidl/WindowRoot.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[ChromeOnly,
+ Exposed=Window]
+interface WindowRoot : EventTarget {
+};
diff --git a/dom/webidl/Worker.webidl b/dom/webidl/Worker.webidl
new file mode 100644
index 0000000000..155a21cb3a
--- /dev/null
+++ b/dom/webidl/Worker.webidl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/workers.html
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface Worker : EventTarget {
+  [Throws]
+  constructor(USVString scriptURL, optional WorkerOptions options = {});
+
+  undefined terminate();
+
+  [Throws]
+  undefined postMessage(any message, sequence<object> transfer);
+  [Throws]
+  undefined postMessage(any message, optional StructuredSerializeOptions aOptions = {});
+
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+};
+
+Worker includes AbstractWorker;
+
+dictionary WorkerOptions {
+  [Pref="dom.workers.modules.enabled"]
+  WorkerType type = "classic";
+  [Pref="dom.workers.modules.enabled"]
+  RequestCredentials credentials = "same-origin"; // credentials is only used if type is "module"
+  DOMString name = "";
+};
+
+enum WorkerType { "classic", "module" };
+
+[Func="mozilla::dom::ChromeWorker::WorkerAvailable",
+ Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface ChromeWorker : Worker {
+  [Throws]
+  constructor(USVString scriptURL, optional WorkerOptions options = {});
+};
diff --git a/dom/webidl/WorkerDebuggerGlobalScope.webidl b/dom/webidl/WorkerDebuggerGlobalScope.webidl
new file mode 100644
index 0000000000..bb6140be9f
--- /dev/null
+++ b/dom/webidl/WorkerDebuggerGlobalScope.webidl
@@ -0,0 +1,51 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Global=(WorkerDebugger), Exposed=WorkerDebugger]
+interface WorkerDebuggerGlobalScope : EventTarget {
+  [Throws]
+  readonly attribute object global;
+
+  [Throws]
+  object createSandbox(DOMString name, object prototype);
+
+  [Throws]
+  undefined loadSubScript(DOMString url, optional object sandbox);
+
+  undefined enterEventLoop();
+
+  undefined leaveEventLoop();
+
+  undefined postMessage(DOMString message);
+
+  attribute EventHandler onmessage;
+
+  attribute EventHandler onmessageerror;
+
+  [Throws]
+  undefined setImmediate(Function handler);
+
+  undefined reportError(DOMString message);
+
+  [Throws]
+  sequence<any> retrieveConsoleEvents();
+
+  [Throws]
+  undefined setConsoleEventHandler(AnyCallback? handler);
+
+  [Throws]
+  undefined clearConsoleEvents();
+
+  // base64 utility methods
+  [Throws]
+  DOMString btoa(DOMString btoa);
+  [Throws]
+  DOMString atob(DOMString atob);
+};
+
+// So you can debug while you debug
+partial interface WorkerDebuggerGlobalScope {
+  undefined dump(optional DOMString string);
+};
diff --git a/dom/webidl/WorkerGlobalScope.webidl b/dom/webidl/WorkerGlobalScope.webidl
new file mode 100644
index 0000000000..bb21cdb824
--- /dev/null
+++ b/dom/webidl/WorkerGlobalScope.webidl
@@ -0,0 +1,50 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/workers.html#the-workerglobalscope-common-interface
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Exposed=(Worker)]
+interface WorkerGlobalScope : EventTarget {
+  [Constant, Cached]
+  readonly attribute WorkerGlobalScope self;
+  readonly attribute WorkerLocation location;
+  readonly attribute WorkerNavigator navigator;
+
+  [Throws]
+  undefined importScripts(DOMString... urls);
+
+  attribute OnErrorEventHandler onerror;
+
+  attribute EventHandler onlanguagechange;
+  attribute EventHandler onoffline;
+  attribute EventHandler ononline;
+  attribute EventHandler onrejectionhandled;
+  attribute EventHandler onunhandledrejection;
+  // also has additional members in a partial interface
+};
+
+WorkerGlobalScope includes GlobalCrypto;
+WorkerGlobalScope includes FontFaceSource;
+WorkerGlobalScope includes WindowOrWorkerGlobalScope;
+
+// Mozilla extensions
+partial interface WorkerGlobalScope {
+
+  undefined dump(optional DOMString str);
+
+  // https://w3c.github.io/hr-time/#the-performance-attribute
+  [Constant, Cached, Replaceable, BinaryName="getPerformance"]
+  readonly attribute Performance performance;
+
+  [Func="WorkerGlobalScope::IsInAutomation", Throws]
+  object getJSTestingFunctions();
+};
diff --git a/dom/webidl/WorkerLocation.webidl b/dom/webidl/WorkerLocation.webidl
new file mode 100644
index 0000000000..ce429244c5
--- /dev/null
+++ b/dom/webidl/WorkerLocation.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/workers.html#worker-locations
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and Opera
+ * Software ASA.
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ */
+
+[Exposed=Worker]
+interface WorkerLocation {
+  stringifier readonly attribute USVString href;
+  readonly attribute USVString origin;
+  readonly attribute USVString protocol;
+  readonly attribute USVString host;
+  readonly attribute USVString hostname;
+  readonly attribute USVString port;
+  readonly attribute USVString pathname;
+  readonly attribute USVString search;
+  readonly attribute USVString hash;
+};
diff --git a/dom/webidl/WorkerNavigator.webidl b/dom/webidl/WorkerNavigator.webidl
new file mode 100644
index 0000000000..1f544e3382
--- /dev/null
+++ b/dom/webidl/WorkerNavigator.webidl
@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+[Exposed=Worker]
+interface WorkerNavigator {
+};
+
+WorkerNavigator includes NavigatorID;
+WorkerNavigator includes NavigatorLanguage;
+WorkerNavigator includes NavigatorOnLine;
+WorkerNavigator includes NavigatorConcurrentHardware;
+WorkerNavigator includes NavigatorStorage;
+WorkerNavigator includes GlobalPrivacyControl;
+
+// http://wicg.github.io/netinfo/#extensions-to-the-navigator-interface
+[Exposed=Worker]
+partial interface WorkerNavigator {
+    [Pref="dom.netinfo.enabled", Throws]
+    readonly attribute NetworkInformation connection;
+};
+
+// https://wicg.github.io/media-capabilities/#idl-index
+[Exposed=Worker]
+partial interface WorkerNavigator {
+  [SameObject, Func="mozilla::dom::MediaCapabilities::Enabled"]
+  readonly attribute MediaCapabilities mediaCapabilities;
+};
+
+// https://wicg.github.io/web-locks/#navigator-mixins
+WorkerNavigator includes NavigatorLocks;
+
+// https://gpuweb.github.io/gpuweb/#navigator-gpu
+WorkerNavigator includes GPUProvider;
diff --git a/dom/webidl/WorkerTestUtils.webidl b/dom/webidl/WorkerTestUtils.webidl
new file mode 100644
index 0000000000..9c1ae31926
--- /dev/null
+++ b/dom/webidl/WorkerTestUtils.webidl
@@ -0,0 +1,9 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[Exposed=Worker, Pref="dom.workers.testing.enabled"]
+namespace WorkerTestUtils {
+  [Throws]
+  unsigned long currentTimerNestingLevel();
+};
diff --git a/dom/webidl/Worklet.webidl b/dom/webidl/Worklet.webidl
new file mode 100644
index 0000000000..d87742dfa3
--- /dev/null
+++ b/dom/webidl/Worklet.webidl
@@ -0,0 +1,19 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.css-houdini.org/worklets/#idl-index
+ */
+
+[SecureContext, Pref="dom.worklet.enabled",
+ Exposed=Window]
+interface Worklet {
+  [NewObject, Throws, NeedsCallerType]
+  Promise<undefined> addModule(USVString moduleURL, optional WorkletOptions options = {});
+};
+
+dictionary WorkletOptions {
+  RequestCredentials credentials = "same-origin";
+};
diff --git a/dom/webidl/WorkletGlobalScope.webidl b/dom/webidl/WorkletGlobalScope.webidl
new file mode 100644
index 0000000000..ba24066c38
--- /dev/null
+++ b/dom/webidl/WorkletGlobalScope.webidl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://drafts.css-houdini.org/worklets/#idl-index
+ */
+
+[Exposed=Worklet]
+interface WorkletGlobalScope {
+};
+
+// Mozilla extensions
+partial interface WorkletGlobalScope {
+  undefined dump(optional DOMString str);
+};
diff --git a/dom/webidl/WritableStream.webidl b/dom/webidl/WritableStream.webidl
new file mode 100644
index 0000000000..b368de8057
--- /dev/null
+++ b/dom/webidl/WritableStream.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#ws-class-definition
+ */
+
+[Exposed=*] // [Transferable] - See Bug 1562065
+interface WritableStream {
+  [Throws]
+  constructor(optional object underlyingSink, optional QueuingStrategy strategy = {});
+
+  readonly attribute boolean locked;
+
+  [Throws]
+  Promise<undefined> abort(optional any reason);
+
+  [NewObject]
+  Promise<undefined> close();
+
+  [Throws]
+  WritableStreamDefaultWriter getWriter();
+};
diff --git a/dom/webidl/WritableStreamDefaultController.webidl b/dom/webidl/WritableStreamDefaultController.webidl
new file mode 100644
index 0000000000..70a8812285
--- /dev/null
+++ b/dom/webidl/WritableStreamDefaultController.webidl
@@ -0,0 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#ws-default-controller-class-definition
+ */
+
+[Exposed=*]
+interface WritableStreamDefaultController {
+  readonly attribute AbortSignal signal;
+  [Throws]
+  undefined error(optional any e);
+};
diff --git a/dom/webidl/WritableStreamDefaultWriter.webidl b/dom/webidl/WritableStreamDefaultWriter.webidl
new file mode 100644
index 0000000000..e033079f04
--- /dev/null
+++ b/dom/webidl/WritableStreamDefaultWriter.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://streams.spec.whatwg.org/#default-writer-class-definition
+ */
+
+[Exposed=*]
+interface WritableStreamDefaultWriter {
+  [Throws]
+  constructor(WritableStream stream);
+
+  readonly attribute Promise<undefined> closed;
+  [Throws] readonly attribute unrestricted double? desiredSize;
+  readonly attribute Promise<undefined> ready;
+
+  [Throws]
+  Promise<undefined> abort(optional any reason);
+
+  [NewObject]
+  Promise<undefined> close();
+
+  undefined releaseLock();
+
+  [NewObject]
+  Promise<undefined> write(optional any chunk);
+};
diff --git a/dom/webidl/XMLDocument.webidl b/dom/webidl/XMLDocument.webidl
new file mode 100644
index 0000000000..73a3b4476f
--- /dev/null
+++ b/dom/webidl/XMLDocument.webidl
@@ -0,0 +1,12 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is:
+ * http://dom.spec.whatwg.org/#xmldocument
+ */
+
+// http://dom.spec.whatwg.org/#xmldocument
+[Exposed=Window]
+interface XMLDocument : Document {};
diff --git a/dom/webidl/XMLHttpRequest.webidl b/dom/webidl/XMLHttpRequest.webidl
new file mode 100644
index 0000000000..66cd6cc79d
--- /dev/null
+++ b/dom/webidl/XMLHttpRequest.webidl
@@ -0,0 +1,144 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://xhr.spec.whatwg.org/#interface-xmlhttprequest
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface InputStream;
+interface MozChannel;
+
+enum XMLHttpRequestResponseType {
+  "",
+  "arraybuffer",
+  "blob",
+  "document",
+  "json",
+  "text",
+};
+
+/**
+ * Parameters for instantiating an XMLHttpRequest. They are passed as an
+ * optional argument to the constructor:
+ *
+ *  new XMLHttpRequest({anon: true, system: true});
+ */
+dictionary MozXMLHttpRequestParameters
+{
+  /**
+   * If true, the request will be sent without cookie and authentication
+   * headers.
+   */
+  boolean mozAnon = false;
+
+  /**
+   * If true, the same origin policy will not be enforced on the request.
+   */
+  boolean mozSystem = false;
+};
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface XMLHttpRequest : XMLHttpRequestEventTarget {
+  [Throws]
+  constructor(optional MozXMLHttpRequestParameters params = {});
+  // There are apparently callers, specifically CoffeeScript, who do
+  // things like this:
+  //   c = new(window.ActiveXObject || XMLHttpRequest)("Microsoft.XMLHTTP")
+  // To handle that, we need a constructor that takes a string.
+  [Throws]
+  constructor(DOMString ignored);
+
+  // event handler
+  attribute EventHandler onreadystatechange;
+
+  // states
+  const unsigned short UNSENT = 0;
+  const unsigned short OPENED = 1;
+  const unsigned short HEADERS_RECEIVED = 2;
+  const unsigned short LOADING = 3;
+  const unsigned short DONE = 4;
+
+  readonly attribute unsigned short readyState;
+
+  // request
+  [Throws]
+  undefined open(ByteString method, USVString url);
+  [Throws]
+  undefined open(ByteString method, USVString url, boolean async,
+            optional USVString? user=null, optional USVString? password=null);
+  [Throws]
+  undefined setRequestHeader(ByteString header, ByteString value);
+
+  [SetterThrows]
+  attribute unsigned long timeout;
+
+  [SetterThrows]
+  attribute boolean withCredentials;
+
+  [Throws]
+  readonly attribute XMLHttpRequestUpload upload;
+
+  [Throws]
+  undefined send(optional (Document or XMLHttpRequestBodyInit)? body = null);
+
+  [Throws]
+  undefined abort();
+
+  // response
+  readonly attribute USVString responseURL;
+
+  [Throws]
+  readonly attribute unsigned short status;
+
+  [Throws]
+  readonly attribute ByteString statusText;
+
+  [Throws]
+  ByteString? getResponseHeader(ByteString header);
+
+  [Throws]
+  ByteString getAllResponseHeaders();
+
+  [Throws]
+  undefined overrideMimeType(DOMString mime);
+
+  [SetterThrows]
+  attribute XMLHttpRequestResponseType responseType;
+  [Throws]
+  readonly attribute any response;
+  [Cached, Pure, Throws]
+  readonly attribute USVString? responseText;
+
+  [Throws, Exposed=Window]
+  readonly attribute Document? responseXML;
+
+  // Mozilla-specific stuff
+
+  [ChromeOnly, SetterThrows]
+  attribute boolean mozBackgroundRequest;
+
+  [ChromeOnly, Exposed=Window]
+  readonly attribute MozChannel? channel;
+
+  [Throws, ChromeOnly, Exposed=Window]
+  any getInterface(any iid);
+
+  [ChromeOnly, Exposed=Window]
+  undefined setOriginAttributes(optional OriginAttributesDictionary originAttributes = {});
+
+  [ChromeOnly, Throws]
+  undefined sendInputStream(InputStream body);
+
+  // Only works on MainThread.
+  // Its permanence is to be evaluated in bug 1368540 for Firefox 60.
+  [ChromeOnly]
+  readonly attribute unsigned short errorCode;
+
+  readonly attribute boolean mozAnon;
+  readonly attribute boolean mozSystem;
+};
diff --git a/dom/webidl/XMLHttpRequestEventTarget.webidl b/dom/webidl/XMLHttpRequestEventTarget.webidl
new file mode 100644
index 0000000000..035da04ccd
--- /dev/null
+++ b/dom/webidl/XMLHttpRequestEventTarget.webidl
@@ -0,0 +1,29 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * www.w3.org/TR/2012/WD-XMLHttpRequest-20120117/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface XMLHttpRequestEventTarget : EventTarget {
+  // event handlers
+  attribute EventHandler onloadstart;
+
+  attribute EventHandler onprogress;
+
+  attribute EventHandler onabort;
+
+  attribute EventHandler onerror;
+
+  attribute EventHandler onload;
+
+  attribute EventHandler ontimeout;
+
+  attribute EventHandler onloadend;
+};
diff --git a/dom/webidl/XMLHttpRequestUpload.webidl b/dom/webidl/XMLHttpRequestUpload.webidl
new file mode 100644
index 0000000000..cbb8728b7a
--- /dev/null
+++ b/dom/webidl/XMLHttpRequestUpload.webidl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * www.w3.org/TR/2012/WD-XMLHttpRequest-20120117/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface XMLHttpRequestUpload : XMLHttpRequestEventTarget {
+
+};
diff --git a/dom/webidl/XMLSerializer.webidl b/dom/webidl/XMLSerializer.webidl
new file mode 100644
index 0000000000..80da236c9c
--- /dev/null
+++ b/dom/webidl/XMLSerializer.webidl
@@ -0,0 +1,39 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * http://domparsing.spec.whatwg.org/#the-xmlserializer-interface
+ */
+
+interface OutputStream;
+
+[Exposed=Window]
+interface XMLSerializer {
+  constructor();
+
+  /**
+   * The subtree rooted by the specified element is serialized to
+   * a string.
+   *
+   * @param root The root of the subtree to be serialized. This could
+   *             be any node, including a Document.
+   * @returns The serialized subtree in the form of a Unicode string
+   */
+  [Throws]
+  DOMString serializeToString(Node root);
+
+  // Mozilla-specific stuff
+  /**
+   * The subtree rooted by the specified element is serialized to
+   * a byte stream using the character set specified.
+   * @param root The root of the subtree to be serialized. This could
+   *             be any node, including a Document.
+   * @param stream The byte stream to which the subtree is serialized.
+   * @param charset The name of the character set to use for the encoding
+   *                to a byte stream.  If this string is empty and root is
+   *                a document, the document's character set will be used.
+   */
+  [Throws, ChromeOnly]
+  undefined serializeToStream(Node root, OutputStream stream, DOMString? charset);
+};
diff --git a/dom/webidl/XPathEvaluator.webidl b/dom/webidl/XPathEvaluator.webidl
new file mode 100644
index 0000000000..0d658c1a65
--- /dev/null
+++ b/dom/webidl/XPathEvaluator.webidl
@@ -0,0 +1,25 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface XPathEvaluator {
+  constructor();
+};
+XPathEvaluator includes XPathEvaluatorMixin;
+
+interface mixin XPathEvaluatorMixin {
+  [NewObject, Throws]
+  XPathExpression createExpression(DOMString expression,
+                                   optional XPathNSResolver? resolver = null);
+  [Pure]
+  Node createNSResolver(Node nodeResolver);
+  [Throws]
+  XPathResult evaluate(DOMString expression,
+                       Node contextNode,
+                       optional XPathNSResolver? resolver = null,
+                       optional unsigned short type = 0 /* XPathResult.ANY_TYPE */,
+                       optional object? result = null);
+};
diff --git a/dom/webidl/XPathExpression.webidl b/dom/webidl/XPathExpression.webidl
new file mode 100644
index 0000000000..4ccc76d6ad
--- /dev/null
+++ b/dom/webidl/XPathExpression.webidl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+interface XPathExpression {
+  // The result specifies a specific result object which may be reused and
+  // returned by this method. If this is specified as null or it's not an
+  // XPathResult object, a new result object will be constructed and returned.
+  [Throws]
+  XPathResult evaluate(Node contextNode,
+                       optional unsigned short type = 0  /* XPathResult.ANY_TYPE */,
+                       optional object? result = null);
+
+  // The result specifies a specific result object which may be reused and
+  // returned by this method. If this is specified as null or it's not an
+  // XPathResult object, a new result object will be constructed and returned.
+  [Throws, ChromeOnly]
+  XPathResult evaluateWithContext(Node contextNode,
+                                  unsigned long contextPosition,
+                                  unsigned long contextSize,
+                                  optional unsigned short type = 0  /* XPathResult.ANY_TYPE */,
+                                  optional object? result = null);
+};
diff --git a/dom/webidl/XPathNSResolver.webidl b/dom/webidl/XPathNSResolver.webidl
new file mode 100644
index 0000000000..1011f92e1f
--- /dev/null
+++ b/dom/webidl/XPathNSResolver.webidl
@@ -0,0 +1,11 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+[Exposed=Window]
+callback interface XPathNSResolver
+{
+  DOMString? lookupNamespaceURI(DOMString? prefix);
+};
diff --git a/dom/webidl/XPathResult.webidl b/dom/webidl/XPathResult.webidl
new file mode 100644
index 0000000000..dbd8402f2a
--- /dev/null
+++ b/dom/webidl/XPathResult.webidl
@@ -0,0 +1,39 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Corresponds to http://www.w3.org/TR/2002/WD-DOM-Level-3-XPath-20020208
+ */
+
+[Exposed=Window]
+interface XPathResult {
+  // XPathResultType
+  const unsigned short ANY_TYPE = 0;
+  const unsigned short NUMBER_TYPE = 1;
+  const unsigned short STRING_TYPE = 2;
+  const unsigned short BOOLEAN_TYPE = 3;
+  const unsigned short UNORDERED_NODE_ITERATOR_TYPE = 4;
+  const unsigned short ORDERED_NODE_ITERATOR_TYPE = 5;
+  const unsigned short UNORDERED_NODE_SNAPSHOT_TYPE = 6;
+  const unsigned short ORDERED_NODE_SNAPSHOT_TYPE = 7;
+  const unsigned short ANY_UNORDERED_NODE_TYPE = 8;
+  const unsigned short FIRST_ORDERED_NODE_TYPE = 9;
+
+  readonly attribute unsigned short resultType;
+  [Throws]
+  readonly attribute double numberValue;
+  [Throws]
+  readonly attribute DOMString stringValue;
+  [Throws]
+  readonly attribute boolean booleanValue;
+  [Throws]
+  readonly attribute Node? singleNodeValue;
+  readonly attribute boolean invalidIteratorState;
+  [Throws]
+  readonly attribute unsigned long snapshotLength;
+  [Throws]
+  Node? iterateNext();
+  [Throws]
+  Node? snapshotItem(unsigned long index);
+};
diff --git a/dom/webidl/XRInputSourceEvent.webidl b/dom/webidl/XRInputSourceEvent.webidl
new file mode 100644
index 0000000000..488b1b958d
--- /dev/null
+++ b/dom/webidl/XRInputSourceEvent.webidl
@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://immersive-web.github.io/webxr/#xrinputsourceevent-interface
+ */
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRInputSourceEvent : Event {
+  constructor(DOMString type, XRInputSourceEventInit eventInitDict);
+  [SameObject] readonly attribute XRFrame frame;
+  [SameObject] readonly attribute XRInputSource inputSource;
+};
+
+dictionary XRInputSourceEventInit : EventInit {
+  required XRFrame frame;
+  required XRInputSource inputSource;
+};
diff --git a/dom/webidl/XRInputSourcesChangeEvent.webidl b/dom/webidl/XRInputSourcesChangeEvent.webidl
new file mode 100644
index 0000000000..83c2fa6f00
--- /dev/null
+++ b/dom/webidl/XRInputSourcesChangeEvent.webidl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://immersive-web.github.io/webxr/#xrinputsourceschangeevent-interface
+ */
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRInputSourcesChangeEvent : Event {
+  constructor(DOMString type, XRInputSourcesChangeEventInit eventInitDict);
+  [SameObject] readonly attribute XRSession session;
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  [Constant, Cached, Frozen]
+  readonly attribute sequence<XRInputSource> added;
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  [Constant, Cached, Frozen]
+  readonly attribute sequence<XRInputSource> removed;
+};
+
+dictionary XRInputSourcesChangeEventInit : EventInit {
+  required XRSession session;
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  required sequence<XRInputSource> added;
+  // TODO: Use FrozenArray once available. (Bug 1236777)
+  required sequence<XRInputSource> removed;
+};
diff --git a/dom/webidl/XRReferenceSpaceEvent.webidl b/dom/webidl/XRReferenceSpaceEvent.webidl
new file mode 100644
index 0000000000..453872b1de
--- /dev/null
+++ b/dom/webidl/XRReferenceSpaceEvent.webidl
@@ -0,0 +1,24 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://immersive-web.github.io/webxr/#xrreferencespaceevent-interface
+ */
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRReferenceSpaceEvent : Event {
+  constructor(DOMString type, XRReferenceSpaceEventInit eventInitDict);
+  [SameObject] readonly attribute XRReferenceSpace referenceSpace;
+  [SameObject] readonly attribute XRRigidTransform? transform;
+};
+
+dictionary XRReferenceSpaceEventInit : EventInit {
+  required XRReferenceSpace referenceSpace;
+  /*
+   * Changed from "XRRigidTransform transform;" in order to work with the
+   * event code generation.
+   */
+  XRRigidTransform? transform = null;
+};
diff --git a/dom/webidl/XRSessionEvent.webidl b/dom/webidl/XRSessionEvent.webidl
new file mode 100644
index 0000000000..ac9f60baed
--- /dev/null
+++ b/dom/webidl/XRSessionEvent.webidl
@@ -0,0 +1,18 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://immersive-web.github.io/webxr/#xrsessionevent-interface
+ */
+
+[Pref="dom.vr.webxr.enabled", SecureContext, Exposed=Window]
+interface XRSessionEvent : Event {
+  constructor(DOMString type, XRSessionEventInit eventInitDict);
+  readonly attribute XRSession session;
+};
+
+dictionary XRSessionEventInit : EventInit {
+  required XRSession session;
+};
diff --git a/dom/webidl/XSLTProcessor.webidl b/dom/webidl/XSLTProcessor.webidl
new file mode 100644
index 0000000000..69b195ded7
--- /dev/null
+++ b/dom/webidl/XSLTProcessor.webidl
@@ -0,0 +1,112 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+typedef (unrestricted double or boolean or DOMString or Node or sequence<Node> or XPathResult) XSLTParameterValue;
+
+[Exposed=Window]
+interface XSLTProcessor {
+    [UseCounter]
+    constructor();
+
+    /**
+     * Import the stylesheet into this XSLTProcessor for transformations.
+     *
+     * @param style The root-node of a XSLT stylesheet. This can be either
+     *              a document node or an element node. If a document node
+     *              then the document can contain either a XSLT stylesheet
+     *              or a LRE stylesheet.
+     *              If the argument is an element node it must be the
+     *              xsl:stylesheet (or xsl:transform) element of an XSLT
+     *              stylesheet.
+     */
+    [Throws]
+    undefined importStylesheet(Node style);
+
+    /**
+     * Transforms the node source applying the stylesheet given by
+     * the importStylesheet() function. The owner document of the output node
+     * owns the returned document fragment.
+     *
+     * @param source The node to be transformed
+     * @param output This document is used to generate the output
+     * @return DocumentFragment The result of the transformation
+     */
+    [CEReactions, Throws]
+    DocumentFragment transformToFragment(Node source,
+                                         Document output);
+
+    /**
+     * Transforms the node source applying the stylesheet given by the
+     * importStylesheet() function.
+     *
+     * @param source The node to be transformed
+     * @return Document The result of the transformation
+     */
+    [CEReactions, Throws]
+    Document transformToDocument(Node source);
+
+    /**
+     * Sets a parameter to be used in subsequent transformations with this
+     * XSLTProcessor. If the parameter doesn't exist in the stylesheet the
+     * parameter will be ignored.
+     *
+     * @param namespaceURI The namespaceURI of the XSLT parameter
+     * @param localName    The local name of the XSLT parameter
+     * @param value        The new value of the XSLT parameter
+     */
+    [Throws]
+    undefined setParameter([LegacyNullToEmptyString] DOMString namespaceURI,
+                           DOMString localName,
+                           XSLTParameterValue value);
+
+    /**
+     * Gets a parameter if previously set by setParameter. Returns null
+     * otherwise.
+     *
+     * @param namespaceURI    The namespaceURI of the XSLT parameter
+     * @param localName       The local name of the XSLT parameter
+     * @return ParameterValue The value of the XSLT parameter
+     */
+    [Throws]
+    XSLTParameterValue? getParameter([LegacyNullToEmptyString] DOMString namespaceURI,
+                                     DOMString localName);
+    /**
+     * Removes a parameter, if set. This will make the processor use the
+     * default-value for the parameter as specified in the stylesheet.
+     *
+     * @param namespaceURI The namespaceURI of the XSLT parameter
+     * @param localName    The local name of the XSLT parameter
+     */
+    [Throws]
+    undefined removeParameter([LegacyNullToEmptyString] DOMString namespaceURI,
+                              DOMString localName);
+
+    /**
+     * Removes all set parameters from this XSLTProcessor. This will make
+     * the processor use the default-value for all parameters as specified in
+     * the stylesheet.
+     */
+    undefined clearParameters();
+
+    /**
+     * Remove all parameters and stylesheets from this XSLTProcessor.
+     */
+    undefined reset();
+
+    /**
+    * Disables all loading of external documents, such as from
+    * <xsl:import> and document()
+    * Defaults to off and is *not* reset by calls to reset()
+    */
+    [ChromeOnly]
+    const unsigned long DISABLE_ALL_LOADS = 1;
+
+    /**
+    * Flags for this processor. Defaults to 0. See individual flags above
+    * for documentation for effect of reset()
+    */
+    [ChromeOnly, NeedsCallerType]
+    attribute unsigned long flags;
+};
diff --git a/dom/webidl/XULCommandEvent.webidl b/dom/webidl/XULCommandEvent.webidl
new file mode 100644
index 0000000000..b3114fdfac
--- /dev/null
+++ b/dom/webidl/XULCommandEvent.webidl
@@ -0,0 +1,58 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * This interface is supported by command events, which are dispatched to
+ * XUL elements as a result of mouse or keyboard activation.
+ */
+[ChromeOnly,
+ Exposed=Window]
+interface XULCommandEvent : UIEvent
+{
+  /**
+   * Command events support the same set of modifier keys as mouse and key
+   * events.
+   */
+  readonly attribute boolean ctrlKey;
+  readonly attribute boolean shiftKey;
+  readonly attribute boolean altKey;
+  readonly attribute boolean metaKey;
+
+  /**
+   * Command events use the same button values as mouse events.
+   * The button will be 0 if the command was not caused by a mouse event.
+   */
+  readonly attribute short button;
+
+  /**
+   * The input source, if this event was triggered by a mouse event.
+   */
+  readonly attribute unsigned short inputSource;
+
+  /**
+   * If the command event was redispatched because of a command= attribute
+   * on the original target, sourceEvent will be set to the original DOM Event.
+   * Otherwise, sourceEvent is null.
+   */
+  readonly attribute Event? sourceEvent;
+
+  /**
+   * Creates a new command event with the given attributes.
+   */
+  [Throws]
+  undefined initCommandEvent(DOMString type,
+                             optional boolean canBubble = false,
+                             optional boolean cancelable = false,
+                             optional Window? view = null,
+                             optional long detail = 0,
+                             optional boolean ctrlKey = false,
+                             optional boolean altKey = false,
+                             optional boolean shiftKey = false,
+                             optional boolean metaKey = false,
+                             optional short buttonArg = 0,
+                             optional Event? sourceEvent = null,
+                             optional unsigned short inputSource = 0);
+};
diff --git a/dom/webidl/XULElement.webidl b/dom/webidl/XULElement.webidl
new file mode 100644
index 0000000000..96896e8d90
--- /dev/null
+++ b/dom/webidl/XULElement.webidl
@@ -0,0 +1,58 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface XULControllers;
+
+[ChromeOnly,
+ Exposed=Window]
+interface XULElement : Element {
+  [HTMLConstructor] constructor();
+
+  // Properties for hiding elements.
+  attribute boolean hidden;
+  attribute boolean collapsed;
+
+  // Property for hooking up to broadcasters
+  [SetterThrows]
+  attribute DOMString observes;
+
+  // Properties for hooking up to popups
+  [SetterThrows]
+  attribute DOMString menu;
+  [SetterThrows]
+  attribute DOMString contextMenu;
+  [SetterThrows]
+  attribute DOMString tooltip;
+
+  // Tooltip
+  [SetterThrows]
+  attribute DOMString tooltipText;
+
+  // Properties for images
+  [SetterThrows]
+  attribute DOMString src;
+
+  [Throws, ChromeOnly]
+  readonly attribute XULControllers             controllers;
+
+  [NeedsCallerType]
+  undefined                      click();
+  undefined                      doCommand();
+
+  // Returns true if this is a menu-type element that has a menu
+  // frame associated with it.
+  boolean hasMenu();
+
+  // If this is a menu-type element, opens or closes the menu
+  // depending on the argument passed.
+  undefined openMenu(boolean open);
+};
+
+XULElement includes GlobalEventHandlers;
+XULElement includes HTMLOrForeignElement;
+XULElement includes ElementCSSInlineStyle;
+XULElement includes TouchEventHandlers;
+XULElement includes OnErrorEventHandlerForNodes;
diff --git a/dom/webidl/XULPopupElement.webidl b/dom/webidl/XULPopupElement.webidl
new file mode 100644
index 0000000000..793b53c10f
--- /dev/null
+++ b/dom/webidl/XULPopupElement.webidl
@@ -0,0 +1,205 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+dictionary OpenPopupOptions {
+  // manner in which to anchor the popup to node
+  DOMString position = "";
+  // horizontal offset
+  long x = 0;
+  // vertical offset
+  long y = 0;
+  // isContextMenu true for context menus, false for other popups
+  boolean isContextMenu = false;
+  // true if popup node attributes override position
+  boolean attributesOverride = false;
+  // triggerEvent the event that triggered this popup (mouse click for example)
+  Event? triggerEvent = null;
+};
+
+dictionary ActivateMenuItemOptions {
+  boolean altKey = false;
+  boolean metaKey = false;
+  boolean ctrlKey = false;
+  boolean shiftKey = false;
+  short button = 0;
+};
+
+typedef (DOMString or OpenPopupOptions) StringOrOpenPopupOptions;
+
+[ChromeOnly,
+ Exposed=Window]
+interface XULPopupElement : XULElement
+{
+  [HTMLConstructor] constructor();
+
+  /**
+   * Open the popup relative to a specified node at a specific location.
+   *
+   * If the popup is already open, calling this method has no effect.
+   *
+   * The popup may be either anchored to another node or opened freely.
+   * To anchor a popup to a node, supply an anchor node and set the position
+   * to a string indicating the manner in which the popup should be anchored.
+   * Possible values for position are:
+   *    before_start, before_end, after_start, after_end,
+   *    start_before, start_after, end_before, end_after,
+   *    overlap, after_pointer
+   *
+   * The anchor node does not need to be in the same document as the popup.
+   *
+   * If the attributesOverride argument is true, the popupanchor, popupalign
+   * and position attributes on the popup node override the position value
+   * argument. If attributesOverride is false, the attributes are only used
+   * if position is empty.
+   *
+   * For an anchored popup, the x and y arguments may be used to offset the
+   * popup from its anchored position by some distance, measured in CSS pixels.
+   * x increases to the right and y increases down. Negative values may also
+   * be used to move to the left and upwards respectively.
+   *
+   * Unanchored popups may be created by supplying null as the anchor node.
+   * An unanchored popup appears at the position specified by x and y,
+   * relative to the viewport of the document containing the popup node. In
+   * this case, position and attributesOverride are ignored.
+   *
+   * @param anchorElement the node to anchor the popup to, may be null
+   * @param options either options to use, or a string position
+   * @param x horizontal offset
+   * @param y vertical offset
+   * @param isContextMenu true for context menus, false for other popups
+   * @param attributesOverride true if popup node attributes override position
+   * @param triggerEvent the event that triggered this popup (mouse click for example)
+   */
+  undefined openPopup(optional Element? anchorElement = null,
+                      optional StringOrOpenPopupOptions options = {},
+                      optional long x = 0,
+                      optional long y = 0,
+                      optional boolean isContextMenu = false,
+                      optional boolean attributesOverride = false,
+                      optional Event? triggerEvent = null);
+
+  /**
+   * Open the popup at a specific screen position specified by x and y. This
+   * position may be adjusted if it would cause the popup to be off of the
+   * screen. The x and y coordinates are measured in CSS pixels, and like all
+   * screen coordinates, are given relative to the top left of the primary
+   * screen.
+   *
+   * @param isContextMenu true for context menus, false for other popups
+   * @param x horizontal screen position
+   * @param y vertical screen position
+   * @param triggerEvent the event that triggered this popup (mouse click for example)
+   */
+  undefined openPopupAtScreen(optional long x = 0, optional long y = 0,
+                              optional boolean isContextMenu = false,
+                              optional Event? triggerEvent = null);
+
+  /**
+   * Open the popup anchored at a specific screen rectangle. This function is
+   * similar to openPopup except that that rectangle of the anchor is supplied
+   * rather than an element. The anchor rectangle arguments are screen
+   * coordinates.
+   *
+   * If the popup is already open, calling this method has no effect.
+   */
+  undefined openPopupAtScreenRect(optional DOMString position = "",
+                                  optional long x = 0,
+                                  optional long y = 0,
+                                  optional long width = 0,
+                                  optional long height = 0,
+                                  optional boolean isContextMenu = false,
+                                  optional boolean attributesOverride = false,
+                                  optional Event? triggerEvent = null);
+
+  /**
+   *  Hide the popup if it is open. The cancel argument is used as a hint that
+   *  the popup is being closed because it has been cancelled, rather than
+   *  something being selected within the panel.
+   *
+   * @param cancel if true, then the popup is being cancelled.
+   */
+  undefined hidePopup(optional boolean cancel = false);
+
+  /**
+   * Activate the item itemElement. This is the recommended way to "click" a
+   * menuitem in automated tests that involve menus.
+   * Fires the command event for the item and then closes the menu.
+   *
+   * Throws an InvalidStateError if the menu is not currently open, or if the
+   * menuitem is not inside this menu, or if the menuitem is hidden. The menuitem
+   * may be an item in a submenu, but that submenu must be open.
+   *
+   * @param itemElement The menuitem to activate.
+   * @param options Which modifier keys and button should be set on the command
+   *                event.
+   */
+  [Throws]
+  undefined activateItem(Element itemElement,
+                         optional ActivateMenuItemOptions options = {});
+
+  /**
+   * Attribute getter and setter for label.
+   */
+  [SetterThrows]
+  attribute DOMString label;
+
+  /**
+   * Attribute getter and setter for position.
+   */
+  [SetterThrows]
+  attribute DOMString position;
+
+  /**
+   * Returns the state of the popup:
+   *   closed - the popup is closed
+   *   open - the popup is open
+   *   showing - the popup is in the process of being shown
+   *   hiding - the popup is in the process of being hidden
+   */
+  readonly attribute DOMString state;
+
+  /**
+   * The node that triggered the popup. If the popup is not open, will return
+   * null.
+   */
+  readonly attribute Node? triggerNode;
+
+  /**
+   * Retrieve the anchor that was specified to openPopup or for menupopups in a
+   * menu, the parent menu.
+   */
+  readonly attribute Element? anchorNode;
+
+  /**
+   * Retrieve the screen rectangle of the popup, including the area occupied by
+   * any titlebar or borders present.
+   */
+  DOMRect getOuterScreenRect();
+
+  /**
+   * Move the popup to a point on screen in CSS pixels.
+   */
+  undefined moveTo(long left, long top);
+
+  /**
+   * Move an open popup to the given anchor position. The arguments have the same
+   * meaning as the corresponding argument to openPopup. This method has no effect
+   * on popups that are not open.
+   */
+  undefined moveToAnchor(optional Element? anchorElement = null,
+                         optional DOMString position = "",
+                         optional long x = 0, optional long y = 0,
+                         optional boolean attributesOverride = false);
+
+  /**
+   * Size the popup to the given dimensions
+   */
+  undefined sizeTo(long width, long height);
+
+  undefined setConstraintRect(DOMRectReadOnly rect);
+
+  readonly attribute boolean isWaylandDragSource;
+  readonly attribute boolean isWaylandPopup;
+};
diff --git a/dom/webidl/XULResizerElement.webidl b/dom/webidl/XULResizerElement.webidl
new file mode 100644
index 0000000000..718a1fd7b8
--- /dev/null
+++ b/dom/webidl/XULResizerElement.webidl
@@ -0,0 +1,10 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+[ChromeOnly, Exposed=Window]
+interface XULResizerElement : XULElement
+{
+  [HTMLConstructor] constructor();
+};
diff --git a/dom/webidl/components.conf b/dom/webidl/components.conf
new file mode 100644
index 0000000000..c387a51f1a
--- /dev/null
+++ b/dom/webidl/components.conf
@@ -0,0 +1,15 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+Classes = [
+    {
+        'cid': '{2ac4e026-cf25-47d5-b067-78d553c3cad8}',
+        'contract_ids': ['@mozilla.org/dom/test-interface-js;1'],
+        'esModule': 'resource://testing-common/TestInterfaceJS.sys.mjs',
+        'constructor': 'TestInterfaceJS',
+    },
+]
+
diff --git a/dom/webidl/moz.build b/dom/webidl/moz.build
new file mode 100644
index 0000000000..0ca37b988e
--- /dev/null
+++ b/dom/webidl/moz.build
@@ -0,0 +1,1219 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+with Files("**"):
+    BUG_COMPONENT = ("Core", "DOM: Core & HTML")
+
+with Files("APZTestData.webidl"):
+    BUG_COMPONENT = ("Core", "Panning and Zooming")
+
+with Files("AccessibleNode.webidl"):
+    BUG_COMPONENT = ("Core", "Disability Access APIs")
+
+with Files("AccessibilityRole.webidl"):
+    BUG_COMPONENT = ("Core", "Disability Access APIs")
+
+with Files("AriaAttributes.webidl"):
+    BUG_COMPONENT = ("Core", "Disability Access APIs")
+
+with Files("Addon*"):
+    BUG_COMPONENT = ("Toolkit", "Add-ons Manager")
+
+with Files("AnalyserNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("Animat*"):
+    BUG_COMPONENT = ("Core", "DOM: Animation")
+
+with Files("*Audio*"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("Autocomplete*"):
+    BUG_COMPONENT = ("Toolkit", "Autocomplete")
+
+with Files("BaseKeyframeTypes.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Animation")
+
+with Files("BatteryManager.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Device Interfaces")
+
+with Files("BiquadFilterNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("Blob*"):
+    BUG_COMPONENT = ("Core", "DOM: File")
+
+with Files("BroadcastChannel.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: postMessage")
+
+with Files("CSP*"):
+    BUG_COMPONENT = ("Core", "DOM: Security")
+
+with Files("CSS*"):
+    BUG_COMPONENT = ("Core", "CSS Parsing and Computation")
+
+with Files("Canvas*"):
+    BUG_COMPONENT = ("Core", "Graphics: Canvas2D")
+
+with Files("Caret*"):
+    BUG_COMPONENT = ("Core", "DOM: Editor")
+
+with Files("Channel*"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("Client*"):
+    BUG_COMPONENT = ("Core", "DOM: Service Workers")
+
+with Files("Clipboard.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Copy & Paste and Drag & Drop")
+
+with Files("ClipboardEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Copy & Paste and Drag & Drop")
+
+with Files("ConstantSourceNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("ConvolverNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("GeolocationCoordinates.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Geolocation")
+
+with Files("CredentialManagement.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Credential Management")
+
+with Files("Crypto.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Security")
+
+with Files("Device*"):
+    BUG_COMPONENT = ("Core", "DOM: Device Interfaces")
+
+with Files("Directory.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Device Interfaces")
+
+with Files("DataTransfer*"):
+    BUG_COMPONENT = ("Core", "DOM: Copy & Paste and Drag & Drop")
+
+with Files("DragEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Copy & Paste and Drag & Drop")
+
+with Files("DecoderDoctorNotification.webidl"):
+    BUG_COMPONENT = ("Core", "Audio/Video: Playback")
+
+with Files("DelayNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("DynamicsCompressorNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("FeaturePolicy.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Security")
+
+with Files("File*"):
+    BUG_COMPONENT = ("Core", "DOM: File")
+
+with Files("FocusEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
+with Files("Font*"):
+    BUG_COMPONENT = ("Core", "CSS Parsing and Computation")
+
+with Files("FormData.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Forms")
+
+with Files("Geolocation.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Geolocation")
+
+with Files("GainNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("Gamepad*"):
+    BUG_COMPONENT = ("Core", "DOM: Device Interfaces")
+
+with Files("GeometryUtils.webidl"):
+    BUG_COMPONENT = ("Core", "Layout")
+
+with Files("GetUserMediaRequest.webidl"):
+    BUG_COMPONENT = ("Core", "WebRTC")
+
+with Files("Grid.webidl"):
+    BUG_COMPONENT = ("Core", "CSS Parsing and Computation")
+
+with Files("HTML*"):
+    BUG_COMPONENT = ("Core", "DOM: Core & HTML")
+
+with Files("HashChangeEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Navigation")
+
+with Files("IDB*"):
+    BUG_COMPONENT = ("Core", "Storage: IndexedDB")
+
+with Files("IdentityCredential.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Credential Management")
+
+with Files("IIRFilterNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("Image*"):
+    BUG_COMPONENT = ("Core", "DOM: Core & HTML")
+
+with Files("ImageBitmap*"):
+    BUG_COMPONENT = ("Core", "Graphics: Canvas2D")
+
+with Files("ImageCapture*"):
+    BUG_COMPONENT = ("Core", "Audio/Video")
+
+with Files("InputEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
+with Files("InstallTrigger.webidl"):
+    BUG_COMPONENT = ("Toolkit", "Add-ons Manager")
+
+with Files("KeyAlgorithm.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Security")
+
+with Files("Key*Event*"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
+with Files("KeyIdsInitData.webidl"):
+    BUG_COMPONENT = ("Core", "Audio/Video: Playback")
+
+with Files("Keyframe*"):
+    BUG_COMPONENT = ("Core", "DOM: Animation")
+
+with Files("MathML*"):
+    BUG_COMPONENT = ("Core", "MathML")
+
+with Files("MediaDevice*"):
+    BUG_COMPONENT = ("Core", "WebRTC")
+
+with Files("Media*Source*"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("MediaStream*"):
+    BUG_COMPONENT = ("Core", "WebRTC")
+
+with Files("MediaStreamTrackAudio*"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("MediaStreamAudio*"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("MediaEncryptedEvent.webidl"):
+    BUG_COMPONENT = ("Core", "Audio/Video")
+
+with Files("MediaKey*"):
+    BUG_COMPONENT = ("Core", "Audio/Video: Playback")
+
+with Files("Media*List*"):
+    BUG_COMPONENT = ("Core", "CSS Parsing and Computation")
+
+with Files("Message*"):
+    BUG_COMPONENT = ("Core", "DOM: postMessage")
+
+with Files("*Record*"):
+    BUG_COMPONENT = ("Core", "Audio/Video: Recording")
+
+with Files("Media*Track*"):
+    BUG_COMPONENT = ("Core", "WebRTC: Audio/Video")
+
+with Files("MIDI*"):
+    BUG_COMPONENT = ("Core", "DOM: Device Interfaces")
+
+with Files("Mouse*"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
+with Files("MutationEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Events")
+
+with Files("NavigationPreloadManager.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Service Workers")
+
+with Files("Net*"):
+    BUG_COMPONENT = ("Core", "Networking")
+
+with Files("OfflineAudio*"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("OffscreenCanvas.webidl"):
+    BUG_COMPONENT = ("Core", "Graphics: Canvas2D")
+
+with Files("OffscreenCanvasRenderingContext2D.webidl"):
+    BUG_COMPONENT = ("Core", "Graphics: Canvas2D")
+
+with Files("OscillatorNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("PannerNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("Peer*"):
+    BUG_COMPONENT = ("Core", "WebRTC")
+
+with Files("PeriodicWave.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("PointerEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
+with Files("PopStateEvent.webidl*"):
+    BUG_COMPONENT = ("Core", "DOM: Navigation")
+
+with Files("GeolocationPosition*"):
+    BUG_COMPONENT = ("Core", "DOM: Geolocation")
+
+with Files("ProfileTimelineMarker.webidl"):
+    BUG_COMPONENT = ("DevTools", "Performance Tools (Profiler/Timeline)")
+
+with Files("PopoverInvokerElement.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Core & HTML")
+
+with Files("ProgressEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Events")
+
+with Files("Push*"):
+    BUG_COMPONENT = ("Core", "DOM: Push Notifications")
+
+with Files("RTC*"):
+    BUG_COMPONENT = ("Core", "WebRTC")
+
+with Files("SVG*"):
+    BUG_COMPONENT = ("Core", "SVG")
+
+with Files("Sanitizer.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Security")
+
+with Files("ScriptProcessorNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("Selection.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Selection")
+
+with Files("ServiceWorker*"):
+    BUG_COMPONENT = ("Core", "DOM: Service Workers")
+
+with Files("SimpleGestureEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
+with Files("SocketCommon.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Networking")
+
+with Files("SourceBuffer*"):
+    BUG_COMPONENT = ("Core", "Audio/Video")
+
+with Files("Speech*"):
+    BUG_COMPONENT = ("Core", "Web Speech")
+
+with Files("StereoPannerNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("StreamFilter*"):
+    BUG_COMPONENT = ("WebExtensions", "Request Handling")
+
+with Files("Style*"):
+    BUG_COMPONENT = ("Core", "DOM: CSS Object Model")
+
+with Files("SubtleCrypto.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Security")
+
+with Files("TCP*"):
+    BUG_COMPONENT = ("Core", "DOM: Networking")
+
+with Files("TextTrack*"):
+    BUG_COMPONENT = ("Core", "Audio/Video")
+
+with Files("TrackEvent.webidl"):
+    BUG_COMPONENT = ("Core", "Audio/Video")
+
+with Files("UDP*"):
+    BUG_COMPONENT = ("Core", "DOM: Networking")
+
+with Files("UIEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
+with Files("URL.webidl"):
+    BUG_COMPONENT = ("Core", "Audio/Video")
+
+with Files("UserProximityEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
+with Files("VTT*"):
+    BUG_COMPONENT = ("Core", "Audio/Video")
+
+with Files("VRDisplay.webidl"):
+    BUG_COMPONENT = ("Core", "Graphics")
+
+with Files("Video*"):
+    BUG_COMPONENT = ("Core", "Audio/Video")
+
+with Files("WaveShaperNode.webidl"):
+    BUG_COMPONENT = ("Core", "Web Audio")
+
+with Files("WebAuthentication.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Web Authentication")
+
+with Files("WebGL*"):
+    BUG_COMPONENT = ("Core", "Graphics: CanvasWebGL")
+
+with Files("WebGPU*"):
+    BUG_COMPONENT = ("Core", "Graphics: WebGPU")
+
+with Files("Webrtc*"):
+    BUG_COMPONENT = ("Core", "WebRTC")
+
+with Files("WebXR.webidl"):
+    BUG_COMPONENT = ("Core", "WebVR")
+
+with Files("XR*"):
+    BUG_COMPONENT = ("Core", "WebVR")
+
+with Files("WheelEvent.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: UI Events & Focus Handling")
+
+with Files("WidevineCDMManifest.webidl"):
+    BUG_COMPONENT = ("Core", "Audio/Video: Playback")
+
+with Files("WindowOrWorkerGlobalScope.webidl"):
+    BUG_COMPONENT = ("Core", "DOM: Workers")
+
+with Files("Worker*"):
+    BUG_COMPONENT = ("Core", "DOM: Workers")
+
+with Files("Extension*"):
+    BUG_COMPONENT = ("WebExtensions", "General")
+
+with Files("WebTransport*"):
+    BUG_COMPONENT = ("Core", "Networking")
+
+GENERATED_WEBIDL_FILES = [
+    "CSS2Properties.webidl",
+]
+
+PREPROCESSED_WEBIDL_FILES = [
+    "Node.webidl",
+    "Window.webidl",
+]
+
+WEBIDL_FILES = [
+    "AbortController.webidl",
+    "AbortSignal.webidl",
+    "AbstractRange.webidl",
+    "AbstractWorker.webidl",
+    "AccessibilityRole.webidl",
+    "AddonManager.webidl",
+    "AnalyserNode.webidl",
+    "Animatable.webidl",
+    "Animation.webidl",
+    "AnimationEffect.webidl",
+    "AnimationEvent.webidl",
+    "AnimationFrameProvider.webidl",
+    "AnimationTimeline.webidl",
+    "AnonymousContent.webidl",
+    "AppInfo.webidl",
+    "AppNotificationServiceOptions.webidl",
+    "APZTestData.webidl",
+    "AriaAttributes.webidl",
+    "Attr.webidl",
+    "AudioBuffer.webidl",
+    "AudioBufferSourceNode.webidl",
+    "AudioContext.webidl",
+    "AudioDestinationNode.webidl",
+    "AudioListener.webidl",
+    "AudioNode.webidl",
+    "AudioParam.webidl",
+    "AudioParamDescriptor.webidl",
+    "AudioParamMap.webidl",
+    "AudioProcessingEvent.webidl",
+    "AudioScheduledSourceNode.webidl",
+    "AudioTrack.webidl",
+    "AudioTrackList.webidl",
+    "AudioWorklet.webidl",
+    "AudioWorkletGlobalScope.webidl",
+    "AudioWorkletNode.webidl",
+    "AudioWorkletProcessor.webidl",
+    "AutocompleteInfo.webidl",
+    "BarProp.webidl",
+    "BaseAudioContext.webidl",
+    "BaseKeyframeTypes.webidl",
+    "BasicCardPayment.webidl",
+    "BatteryManager.webidl",
+    "BeforeUnloadEvent.webidl",
+    "BiquadFilterNode.webidl",
+    "Blob.webidl",
+    "BroadcastChannel.webidl",
+    "BrowserElementDictionaries.webidl",
+    "Cache.webidl",
+    "CacheStorage.webidl",
+    "CancelContentJSOptions.webidl",
+    "CanvasCaptureMediaStream.webidl",
+    "CanvasRenderingContext2D.webidl",
+    "CaretPosition.webidl",
+    "CDATASection.webidl",
+    "ChannelMergerNode.webidl",
+    "ChannelSplitterNode.webidl",
+    "CharacterData.webidl",
+    "CheckerboardReportService.webidl",
+    "ChildNode.webidl",
+    "ChildSHistory.webidl",
+    "ChromeNodeList.webidl",
+    "Client.webidl",
+    "Clients.webidl",
+    "Clipboard.webidl",
+    "ClipboardEvent.webidl",
+    "CommandEvent.webidl",
+    "Comment.webidl",
+    "CompositionEvent.webidl",
+    "Console.webidl",
+    "ConstantSourceNode.webidl",
+    "ConvolverNode.webidl",
+    "CreateOfferRequest.webidl",
+    "CredentialManagement.webidl",
+    "Crypto.webidl",
+    "CSPDictionaries.webidl",
+    "CSPReport.webidl",
+    "CSS.webidl",
+    "CSSAnimation.webidl",
+    "CSSConditionRule.webidl",
+    "CSSContainerRule.webidl",
+    "CSSCounterStyleRule.webidl",
+    "CSSFontFaceRule.webidl",
+    "CSSFontFeatureValuesRule.webidl",
+    "CSSFontPaletteValuesRule.webidl",
+    "CSSGroupingRule.webidl",
+    "CSSImportRule.webidl",
+    "CSSKeyframeRule.webidl",
+    "CSSKeyframesRule.webidl",
+    "CSSLayerBlockRule.webidl",
+    "CSSLayerStatementRule.webidl",
+    "CSSMediaRule.webidl",
+    "CSSMozDocumentRule.webidl",
+    "CSSNamespaceRule.webidl",
+    "CSSPageRule.webidl",
+    "CSSPropertyRule.webidl",
+    "CSSPseudoElement.webidl",
+    "CSSRule.webidl",
+    "CSSRuleList.webidl",
+    "CSSStyleDeclaration.webidl",
+    "CSSStyleRule.webidl",
+    "CSSStyleSheet.webidl",
+    "CSSSupportsRule.webidl",
+    "CSSTransition.webidl",
+    "CustomElementRegistry.webidl",
+    "DataTransfer.webidl",
+    "DataTransferItem.webidl",
+    "DataTransferItemList.webidl",
+    "DecoderDoctorNotification.webidl",
+    "DedicatedWorkerGlobalScope.webidl",
+    "DelayNode.webidl",
+    "DeviceMotionEvent.webidl",
+    "Directory.webidl",
+    "Document.webidl",
+    "DocumentFragment.webidl",
+    "DocumentOrShadowRoot.webidl",
+    "DocumentTimeline.webidl",
+    "DocumentType.webidl",
+    "DOMException.webidl",
+    "DOMImplementation.webidl",
+    "DOMLocalization.webidl",
+    "DOMMatrix.webidl",
+    "DOMParser.webidl",
+    "DOMPoint.webidl",
+    "DOMQuad.webidl",
+    "DOMRect.webidl",
+    "DOMRectList.webidl",
+    "DOMRequest.webidl",
+    "DOMStringList.webidl",
+    "DOMStringMap.webidl",
+    "DOMTokenList.webidl",
+    "DragEvent.webidl",
+    "DynamicsCompressorNode.webidl",
+    "Element.webidl",
+    "ElementInternals.webidl",
+    "Event.webidl",
+    "EventHandler.webidl",
+    "EventListener.webidl",
+    "EventSource.webidl",
+    "EventTarget.webidl",
+    "ExtendableEvent.webidl",
+    "ExtendableMessageEvent.webidl",
+    "External.webidl",
+    "FailedCertSecurityInfo.webidl",
+    "FakePluginTagInit.webidl",
+    "FeaturePolicy.webidl",
+    "Fetch.webidl",
+    "FetchEvent.webidl",
+    "FetchObserver.webidl",
+    "File.webidl",
+    "FileList.webidl",
+    "FileMode.webidl",
+    "FileReader.webidl",
+    "FileReaderSync.webidl",
+    "FileSystem.webidl",
+    "FileSystemDirectoryEntry.webidl",
+    "FileSystemDirectoryHandle.webidl",
+    "FileSystemDirectoryIterator.webidl",
+    "FileSystemDirectoryReader.webidl",
+    "FileSystemEntry.webidl",
+    "FileSystemFileEntry.webidl",
+    "FileSystemFileHandle.webidl",
+    "FileSystemHandle.webidl",
+    "FileSystemSyncAccessHandle.webidl",
+    "FinalizationRegistry.webidl",
+    "FocusEvent.webidl",
+    "FontFace.webidl",
+    "FontFaceSet.webidl",
+    "FontFaceSource.webidl",
+    "FormData.webidl",
+    "Function.webidl",
+    "GainNode.webidl",
+    "Gamepad.webidl",
+    "GamepadHapticActuator.webidl",
+    "GamepadLightIndicator.webidl",
+    "GamepadPose.webidl",
+    "GamepadServiceTest.webidl",
+    "GamepadTouch.webidl",
+    "GenericTransformStream.webidl",
+    "Geolocation.webidl",
+    "GeolocationCoordinates.webidl",
+    "GeolocationPosition.webidl",
+    "GeolocationPositionError.webidl",
+    "GeometryUtils.webidl",
+    "GetUserMediaRequest.webidl",
+    "Grid.webidl",
+    "Headers.webidl",
+    "Highlight.webidl",
+    "History.webidl",
+    "HTMLAllCollection.webidl",
+    "HTMLAnchorElement.webidl",
+    "HTMLAreaElement.webidl",
+    "HTMLAudioElement.webidl",
+    "HTMLBaseElement.webidl",
+    "HTMLBodyElement.webidl",
+    "HTMLBRElement.webidl",
+    "HTMLButtonElement.webidl",
+    "HTMLCanvasElement.webidl",
+    "HTMLCollection.webidl",
+    "HTMLDataElement.webidl",
+    "HTMLDataListElement.webidl",
+    "HTMLDetailsElement.webidl",
+    "HTMLDialogElement.webidl",
+    "HTMLDirectoryElement.webidl",
+    "HTMLDivElement.webidl",
+    "HTMLDListElement.webidl",
+    "HTMLDocument.webidl",
+    "HTMLElement.webidl",
+    "HTMLEmbedElement.webidl",
+    "HTMLFieldSetElement.webidl",
+    "HTMLFontElement.webidl",
+    "HTMLFormControlsCollection.webidl",
+    "HTMLFormElement.webidl",
+    "HTMLFrameElement.webidl",
+    "HTMLFrameSetElement.webidl",
+    "HTMLHeadElement.webidl",
+    "HTMLHeadingElement.webidl",
+    "HTMLHRElement.webidl",
+    "HTMLHtmlElement.webidl",
+    "HTMLHyperlinkElementUtils.webidl",
+    "HTMLIFrameElement.webidl",
+    "HTMLImageElement.webidl",
+    "HTMLInputElement.webidl",
+    "HTMLLabelElement.webidl",
+    "HTMLLegendElement.webidl",
+    "HTMLLIElement.webidl",
+    "HTMLLinkElement.webidl",
+    "HTMLMapElement.webidl",
+    "HTMLMarqueeElement.webidl",
+    "HTMLMediaElement.webidl",
+    "HTMLMenuElement.webidl",
+    "HTMLMetaElement.webidl",
+    "HTMLMeterElement.webidl",
+    "HTMLModElement.webidl",
+    "HTMLObjectElement.webidl",
+    "HTMLOListElement.webidl",
+    "HTMLOptGroupElement.webidl",
+    "HTMLOptionElement.webidl",
+    "HTMLOptionsCollection.webidl",
+    "HTMLOutputElement.webidl",
+    "HTMLParagraphElement.webidl",
+    "HTMLParamElement.webidl",
+    "HTMLPictureElement.webidl",
+    "HTMLPreElement.webidl",
+    "HTMLProgressElement.webidl",
+    "HTMLQuoteElement.webidl",
+    "HTMLScriptElement.webidl",
+    "HTMLSelectElement.webidl",
+    "HTMLSlotElement.webidl",
+    "HTMLSourceElement.webidl",
+    "HTMLSpanElement.webidl",
+    "HTMLStyleElement.webidl",
+    "HTMLTableCaptionElement.webidl",
+    "HTMLTableCellElement.webidl",
+    "HTMLTableColElement.webidl",
+    "HTMLTableElement.webidl",
+    "HTMLTableRowElement.webidl",
+    "HTMLTableSectionElement.webidl",
+    "HTMLTemplateElement.webidl",
+    "HTMLTextAreaElement.webidl",
+    "HTMLTimeElement.webidl",
+    "HTMLTitleElement.webidl",
+    "HTMLTrackElement.webidl",
+    "HTMLUListElement.webidl",
+    "HTMLVideoElement.webidl",
+    "IDBCursor.webidl",
+    "IDBDatabase.webidl",
+    "IDBFactory.webidl",
+    "IDBIndex.webidl",
+    "IDBKeyRange.webidl",
+    "IDBObjectStore.webidl",
+    "IDBOpenDBRequest.webidl",
+    "IDBRequest.webidl",
+    "IDBTransaction.webidl",
+    "IDBVersionChangeEvent.webidl",
+    "IdentityCredential.webidl",
+    "IdleDeadline.webidl",
+    "IIRFilterNode.webidl",
+    "ImageBitmap.webidl",
+    "ImageBitmapRenderingContext.webidl",
+    "ImageCapture.webidl",
+    "ImageData.webidl",
+    "ImageDocument.webidl",
+    "InputEvent.webidl",
+    "IntersectionObserver.webidl",
+    "IntlUtils.webidl",
+    "IterableIterator.webidl",
+    "KeyAlgorithm.webidl",
+    "KeyboardEvent.webidl",
+    "KeyEvent.webidl",
+    "KeyframeAnimationOptions.webidl",
+    "KeyframeEffect.webidl",
+    "KeyIdsInitData.webidl",
+    "LinkStyle.webidl",
+    "LoadURIOptions.webidl",
+    "Localization.webidl",
+    "Location.webidl",
+    "Lock.webidl",
+    "LockManager.webidl",
+    "MathMLElement.webidl",
+    "MediaCapabilities.webidl",
+    "MediaDebugInfo.webidl",
+    "MediaDeviceInfo.webidl",
+    "MediaDevices.webidl",
+    "MediaElementAudioSourceNode.webidl",
+    "MediaEncryptedEvent.webidl",
+    "MediaError.webidl",
+    "MediaKeyError.webidl",
+    "MediaKeyMessageEvent.webidl",
+    "MediaKeys.webidl",
+    "MediaKeySession.webidl",
+    "MediaKeysRequestStatus.webidl",
+    "MediaKeyStatusMap.webidl",
+    "MediaKeySystemAccess.webidl",
+    "MediaList.webidl",
+    "MediaQueryList.webidl",
+    "MediaRecorder.webidl",
+    "MediaSession.webidl",
+    "MediaSource.webidl",
+    "MediaStream.webidl",
+    "MediaStreamAudioDestinationNode.webidl",
+    "MediaStreamAudioSourceNode.webidl",
+    "MediaStreamError.webidl",
+    "MediaStreamTrack.webidl",
+    "MediaStreamTrackAudioSourceNode.webidl",
+    "MediaTrackSettings.webidl",
+    "MediaTrackSupportedConstraints.webidl",
+    "MerchantValidationEvent.webidl",
+    "MessageChannel.webidl",
+    "MessageEvent.webidl",
+    "MessagePort.webidl",
+    "MIDIAccess.webidl",
+    "MIDIInput.webidl",
+    "MIDIInputMap.webidl",
+    "MIDIMessageEvent.webidl",
+    "MIDIOptions.webidl",
+    "MIDIOutput.webidl",
+    "MIDIOutputMap.webidl",
+    "MIDIPort.webidl",
+    "MimeType.webidl",
+    "MimeTypeArray.webidl",
+    "MouseEvent.webidl",
+    "MouseScrollEvent.webidl",
+    "MozFrameLoaderOwner.webidl",
+    "MutationEvent.webidl",
+    "MutationObserver.webidl",
+    "NamedNodeMap.webidl",
+    "NavigationPreloadManager.webidl",
+    "Navigator.webidl",
+    "NetErrorInfo.webidl",
+    "NetworkInformation.webidl",
+    "NetworkOptions.webidl",
+    "NodeFilter.webidl",
+    "NodeIterator.webidl",
+    "NodeList.webidl",
+    "Notification.webidl",
+    "NotificationEvent.webidl",
+    "NotifyPaintEvent.webidl",
+    "OfflineAudioContext.webidl",
+    "OffscreenCanvas.webidl",
+    "OffscreenCanvasRenderingContext2D.webidl",
+    "OscillatorNode.webidl",
+    "PaintRequest.webidl",
+    "PaintRequestList.webidl",
+    "PaintWorkletGlobalScope.webidl",
+    "PannerNode.webidl",
+    "ParentNode.webidl",
+    "PaymentAddress.webidl",
+    "PaymentMethodChangeEvent.webidl",
+    "PaymentRequest.webidl",
+    "PaymentRequestUpdateEvent.webidl",
+    "PaymentResponse.webidl",
+    "Performance.webidl",
+    "PerformanceEntry.webidl",
+    "PerformanceEventTiming.webidl",
+    "PerformanceLargestContentfulPaint.webidl",
+    "PerformanceMark.webidl",
+    "PerformanceMeasure.webidl",
+    "PerformanceNavigation.webidl",
+    "PerformanceNavigationTiming.webidl",
+    "PerformanceObserver.webidl",
+    "PerformanceObserverEntryList.webidl",
+    "PerformancePaintTiming.webidl",
+    "PerformanceResourceTiming.webidl",
+    "PerformanceServerTiming.webidl",
+    "PerformanceTiming.webidl",
+    "PeriodicWave.webidl",
+    "Permissions.webidl",
+    "PermissionStatus.webidl",
+    "Plugin.webidl",
+    "PluginArray.webidl",
+    "PointerEvent.webidl",
+    "PopoverInvokerElement.webidl",
+    "ProcessingInstruction.webidl",
+    "ProfileTimelineMarker.webidl",
+    "Promise.webidl",
+    "PushEvent.webidl",
+    "PushManager.webidl",
+    "PushManager.webidl",
+    "PushMessageData.webidl",
+    "PushSubscription.webidl",
+    "PushSubscriptionOptions.webidl",
+    "RadioNodeList.webidl",
+    "Range.webidl",
+    "ReferrerPolicy.webidl",
+    "Reporting.webidl",
+    "Request.webidl",
+    "ResizeObserver.webidl",
+    "Response.webidl",
+    "Sanitizer.webidl",
+    "Screen.webidl",
+    "ScreenOrientation.webidl",
+    "ScriptProcessorNode.webidl",
+    "ScrollAreaEvent.webidl",
+    "Selection.webidl",
+    "ServiceWorker.webidl",
+    "ServiceWorkerContainer.webidl",
+    "ServiceWorkerGlobalScope.webidl",
+    "ServiceWorkerRegistration.webidl",
+    "ShadowRealmGlobalScope.webidl",
+    "ShadowRoot.webidl",
+    "SharedWorker.webidl",
+    "SharedWorkerGlobalScope.webidl",
+    "SimpleGestureEvent.webidl",
+    "SocketCommon.webidl",
+    "SourceBuffer.webidl",
+    "SourceBufferList.webidl",
+    "StaticRange.webidl",
+    "StereoPannerNode.webidl",
+    "Storage.webidl",
+    "StorageEvent.webidl",
+    "StorageManager.webidl",
+    "StreamFilter.webidl",
+    "StreamFilterDataEvent.webidl",
+    "StructuredCloneTester.webidl",
+    "StyleSheet.webidl",
+    "StyleSheetList.webidl",
+    "SubtleCrypto.webidl",
+    "SVGAElement.webidl",
+    "SVGAngle.webidl",
+    "SVGAnimatedAngle.webidl",
+    "SVGAnimatedBoolean.webidl",
+    "SVGAnimatedEnumeration.webidl",
+    "SVGAnimatedInteger.webidl",
+    "SVGAnimatedLength.webidl",
+    "SVGAnimatedLengthList.webidl",
+    "SVGAnimatedNumber.webidl",
+    "SVGAnimatedNumberList.webidl",
+    "SVGAnimatedPathData.webidl",
+    "SVGAnimatedPoints.webidl",
+    "SVGAnimatedPreserveAspectRatio.webidl",
+    "SVGAnimatedRect.webidl",
+    "SVGAnimatedString.webidl",
+    "SVGAnimatedTransformList.webidl",
+    "SVGAnimateElement.webidl",
+    "SVGAnimateMotionElement.webidl",
+    "SVGAnimateTransformElement.webidl",
+    "SVGAnimationElement.webidl",
+    "SVGCircleElement.webidl",
+    "SVGClipPathElement.webidl",
+    "SVGComponentTransferFunctionElement.webidl",
+    "SVGDefsElement.webidl",
+    "SVGDescElement.webidl",
+    "SVGElement.webidl",
+    "SVGEllipseElement.webidl",
+    "SVGFEBlendElement.webidl",
+    "SVGFEColorMatrixElement.webidl",
+    "SVGFEComponentTransferElement.webidl",
+    "SVGFECompositeElement.webidl",
+    "SVGFEConvolveMatrixElement.webidl",
+    "SVGFEDiffuseLightingElement.webidl",
+    "SVGFEDisplacementMapElement.webidl",
+    "SVGFEDistantLightElement.webidl",
+    "SVGFEDropShadowElement.webidl",
+    "SVGFEFloodElement.webidl",
+    "SVGFEFuncAElement.webidl",
+    "SVGFEFuncBElement.webidl",
+    "SVGFEFuncGElement.webidl",
+    "SVGFEFuncRElement.webidl",
+    "SVGFEGaussianBlurElement.webidl",
+    "SVGFEImageElement.webidl",
+    "SVGFEMergeElement.webidl",
+    "SVGFEMergeNodeElement.webidl",
+    "SVGFEMorphologyElement.webidl",
+    "SVGFEOffsetElement.webidl",
+    "SVGFEPointLightElement.webidl",
+    "SVGFESpecularLightingElement.webidl",
+    "SVGFESpotLightElement.webidl",
+    "SVGFETileElement.webidl",
+    "SVGFETurbulenceElement.webidl",
+    "SVGFilterElement.webidl",
+    "SVGFilterPrimitiveStandardAttributes.webidl",
+    "SVGFitToViewBox.webidl",
+    "SVGForeignObjectElement.webidl",
+    "SVGGElement.webidl",
+    "SVGGeometryElement.webidl",
+    "SVGGradientElement.webidl",
+    "SVGGraphicsElement.webidl",
+    "SVGImageElement.webidl",
+    "SVGLength.webidl",
+    "SVGLengthList.webidl",
+    "SVGLinearGradientElement.webidl",
+    "SVGLineElement.webidl",
+    "SVGMarkerElement.webidl",
+    "SVGMaskElement.webidl",
+    "SVGMatrix.webidl",
+    "SVGMetadataElement.webidl",
+    "SVGMPathElement.webidl",
+    "SVGNumber.webidl",
+    "SVGNumberList.webidl",
+    "SVGPathElement.webidl",
+    "SVGPathSeg.webidl",
+    "SVGPathSegList.webidl",
+    "SVGPatternElement.webidl",
+    "SVGPoint.webidl",
+    "SVGPointList.webidl",
+    "SVGPolygonElement.webidl",
+    "SVGPolylineElement.webidl",
+    "SVGPreserveAspectRatio.webidl",
+    "SVGRadialGradientElement.webidl",
+    "SVGRect.webidl",
+    "SVGRectElement.webidl",
+    "SVGScriptElement.webidl",
+    "SVGSetElement.webidl",
+    "SVGStopElement.webidl",
+    "SVGStringList.webidl",
+    "SVGStyleElement.webidl",
+    "SVGSVGElement.webidl",
+    "SVGSwitchElement.webidl",
+    "SVGSymbolElement.webidl",
+    "SVGTests.webidl",
+    "SVGTextContentElement.webidl",
+    "SVGTextElement.webidl",
+    "SVGTextPathElement.webidl",
+    "SVGTextPositioningElement.webidl",
+    "SVGTitleElement.webidl",
+    "SVGTransform.webidl",
+    "SVGTransformList.webidl",
+    "SVGTSpanElement.webidl",
+    "SVGUnitTypes.webidl",
+    "SVGURIReference.webidl",
+    "SVGUseElement.webidl",
+    "SVGViewElement.webidl",
+    "SVGZoomAndPan.webidl",
+    "TCPServerSocket.webidl",
+    "TCPServerSocketEvent.webidl",
+    "TCPSocket.webidl",
+    "TCPSocketErrorEvent.webidl",
+    "TCPSocketEvent.webidl",
+    "TestUtils.webidl",
+    "Text.webidl",
+    "TextClause.webidl",
+    "TextDecoder.webidl",
+    "TextDecoderStream.webidl",
+    "TextEncoder.webidl",
+    "TextEncoderStream.webidl",
+    "TextTrack.webidl",
+    "TextTrackCue.webidl",
+    "TextTrackCueList.webidl",
+    "TextTrackList.webidl",
+    "TimeEvent.webidl",
+    "TimeRanges.webidl",
+    "ToggleEvent.webidl",
+    "Touch.webidl",
+    "TouchEvent.webidl",
+    "TouchList.webidl",
+    "TransitionEvent.webidl",
+    "TreeColumn.webidl",
+    "TreeColumns.webidl",
+    "TreeContentView.webidl",
+    "TreeView.webidl",
+    "TreeWalker.webidl",
+    "UDPMessageEvent.webidl",
+    "UDPSocket.webidl",
+    "UIEvent.webidl",
+    "URL.webidl",
+    "URLSearchParams.webidl",
+    "ValidityState.webidl",
+    "VideoColorSpace.webidl",
+    "VideoFrame.webidl",
+    "VideoPlaybackQuality.webidl",
+    "VideoTrack.webidl",
+    "VideoTrackList.webidl",
+    "VisualViewport.webidl",
+    "VRDisplay.webidl",
+    "VRDisplayEvent.webidl",
+    "VRServiceTest.webidl",
+    "VTTCue.webidl",
+    "VTTRegion.webidl",
+    "WaveShaperNode.webidl",
+    "WebAuthentication.webidl",
+    "WebGL2RenderingContext.webidl",
+    "WebGLRenderingContext.webidl",
+    "WebGPU.webidl",
+    "WebSocket.webidl",
+    "WebTaskScheduling.webidl",
+    "WebTransport.webidl",
+    "WebTransportDatagramDuplexStream.webidl",
+    "WebTransportError.webidl",
+    "WebTransportSendReceiveStream.webidl",
+    "WebXR.webidl",
+    "WheelEvent.webidl",
+    "WidevineCDMManifest.webidl",
+    "WindowOrWorkerGlobalScope.webidl",
+    "WindowRoot.webidl",
+    "Worker.webidl",
+    "WorkerDebuggerGlobalScope.webidl",
+    "WorkerGlobalScope.webidl",
+    "WorkerLocation.webidl",
+    "WorkerNavigator.webidl",
+    "WorkerTestUtils.webidl",
+    "Worklet.webidl",
+    "WorkletGlobalScope.webidl",
+    "XMLDocument.webidl",
+    "XMLHttpRequest.webidl",
+    "XMLHttpRequestEventTarget.webidl",
+    "XMLHttpRequestUpload.webidl",
+    "XMLSerializer.webidl",
+    "XPathEvaluator.webidl",
+    "XPathExpression.webidl",
+    "XPathNSResolver.webidl",
+    "XPathResult.webidl",
+    "XSLTProcessor.webidl",
+    "XULCommandEvent.webidl",
+    "XULElement.webidl",
+    "XULPopupElement.webidl",
+    "XULResizerElement.webidl",
+]
+
+if CONFIG["MOZ_DOM_STREAMS"]:
+    WEBIDL_FILES += [
+        "CompressionStream.webidl",
+        "DecompressionStream.webidl",
+        "FileSystemWritableFileStream.webidl",
+        "QueuingStrategy.webidl",
+        "ReadableByteStreamController.webidl",
+        "ReadableStream.webidl",
+        "ReadableStreamBYOBReader.webidl",
+        "ReadableStreamBYOBRequest.webidl",
+        "ReadableStreamDefaultController.webidl",
+        "ReadableStreamDefaultReader.webidl",
+        "Transformer.webidl",
+        "TransformStream.webidl",
+        "TransformStreamDefaultController.webidl",
+        "UnderlyingSink.webidl",
+        "UnderlyingSource.webidl",
+        "WritableStream.webidl",
+        "WritableStreamDefaultController.webidl",
+        "WritableStreamDefaultWriter.webidl",
+    ]
+
+if CONFIG["MOZ_WEBRTC"]:
+    WEBIDL_FILES += [
+        "PeerConnectionImpl.webidl",
+        "PeerConnectionObserver.webidl",
+        "PeerConnectionObserverEnums.webidl",
+        "RTCCertificate.webidl",
+        "RTCConfiguration.webidl",
+        "RTCDataChannel.webidl",
+        "RTCDtlsTransport.webidl",
+        "RTCDTMFSender.webidl",
+        "RTCIceCandidate.webidl",
+        "RTCIdentityAssertion.webidl",
+        "RTCIdentityProvider.webidl",
+        "RTCPeerConnection.webidl",
+        "RTCPeerConnectionStatic.webidl",
+        "RTCRtpCapabilities.webidl",
+        "RTCRtpParameters.webidl",
+        "RTCRtpReceiver.webidl",
+        "RTCRtpSender.webidl",
+        "RTCRtpSources.webidl",
+        "RTCRtpTransceiver.webidl",
+        "RTCSctpTransport.webidl",
+        "RTCSessionDescription.webidl",
+        "RTCStatsReport.webidl",
+        "WebrtcGlobalInformation.webidl",
+    ]
+
+if CONFIG["MOZ_WEBSPEECH"]:
+    WEBIDL_FILES += [
+        "SpeechGrammar.webidl",
+        "SpeechGrammarList.webidl",
+        "SpeechRecognition.webidl",
+        "SpeechRecognitionAlternative.webidl",
+        "SpeechRecognitionError.webidl",
+        "SpeechRecognitionEvent.webidl",
+        "SpeechRecognitionResult.webidl",
+        "SpeechRecognitionResultList.webidl",
+        "SpeechSynthesis.webidl",
+        "SpeechSynthesisErrorEvent.webidl",
+        "SpeechSynthesisEvent.webidl",
+        "SpeechSynthesisUtterance.webidl",
+        "SpeechSynthesisVoice.webidl",
+    ]
+
+WEBIDL_FILES += [
+    "CloseEvent.webidl",
+    "CustomEvent.webidl",
+    "DeviceOrientationEvent.webidl",
+    "HashChangeEvent.webidl",
+    "PageTransitionEvent.webidl",
+    "PopStateEvent.webidl",
+    "PopupBlockedEvent.webidl",
+    "ProgressEvent.webidl",
+    "StyleSheetApplicableStateChangeEvent.webidl",
+]
+
+# WebExtensions API.
+WEBIDL_FILES += [
+    "ExtensionAlarms.webidl",
+    "ExtensionBrowser.webidl",
+    "ExtensionBrowserSettings.webidl",
+    "ExtensionBrowserSettingsColorManagement.webidl",
+    "ExtensionDns.webidl",
+    "ExtensionEventManager.webidl",
+    # ExtensionMockAPI is not a real WebExtensions API, and it is only enabled in tests.
+    "ExtensionMockAPI.webidl",
+    "ExtensionPort.webidl",
+    "ExtensionProxy.webidl",
+    "ExtensionRuntime.webidl",
+    "ExtensionScripting.webidl",
+    "ExtensionSetting.webidl",
+    "ExtensionTest.webidl",
+]
+
+# We only expose our prefable test interfaces in debug builds, just to be on
+# the safe side.
+if CONFIG["MOZ_DEBUG"] and CONFIG["ENABLE_TESTS"]:
+    WEBIDL_FILES += [
+        "TestFunctions.webidl",
+        "TestInterfaceJS.webidl",
+        "TestInterfaceJSDictionaries.webidl",
+        "TestInterfaceJSMaplikeSetlikeIterable.webidl",
+        "TestInterfaceObservableArray.webidl",
+    ]
+    XPCOM_MANIFESTS += [
+        "components.conf",
+    ]
+
+WEBIDL_FILES += [
+    "InstallTrigger.webidl",
+]
+
+if CONFIG["FUZZING"]:
+    WEBIDL_FILES += [
+        "FuzzingFunctions.webidl",
+    ]
+
+GENERATED_EVENTS_WEBIDL_FILES = [
+    "AddonEvent.webidl",
+    "AnimationPlaybackEvent.webidl",
+    "BlobEvent.webidl",
+    "CaretStateChangedEvent.webidl",
+    "CloseEvent.webidl",
+    "ContentVisibilityAutoStateChangeEvent.webidl",
+    "DeviceLightEvent.webidl",
+    "DeviceOrientationEvent.webidl",
+    "ErrorEvent.webidl",
+    "FontFaceSetLoadEvent.webidl",
+    "FormDataEvent.webidl",
+    "FrameCrashedEvent.webidl",
+    "GamepadAxisMoveEvent.webidl",
+    "GamepadButtonEvent.webidl",
+    "GamepadEvent.webidl",
+    "GPUUncapturedErrorEvent.webidl",
+    "HashChangeEvent.webidl",
+    "ImageCaptureErrorEvent.webidl",
+    "MediaQueryListEvent.webidl",
+    "MediaRecorderErrorEvent.webidl",
+    "MediaStreamEvent.webidl",
+    "MediaStreamTrackEvent.webidl",
+    "MIDIConnectionEvent.webidl",
+    "OfflineAudioCompletionEvent.webidl",
+    "PageTransitionEvent.webidl",
+    "PerformanceEntryEvent.webidl",
+    "PluginCrashedEvent.webidl",
+    "PopStateEvent.webidl",
+    "PopupBlockedEvent.webidl",
+    "PopupPositionedEvent.webidl",
+    "PositionStateEvent.webidl",
+    "ProgressEvent.webidl",
+    "PromiseRejectionEvent.webidl",
+    "ScrollViewChangeEvent.webidl",
+    "SecurityPolicyViolationEvent.webidl",
+    "StyleSheetApplicableStateChangeEvent.webidl",
+    "SubmitEvent.webidl",
+    "TaskPriorityChangeEvent.webidl",
+    "TCPServerSocketEvent.webidl",
+    "TCPSocketErrorEvent.webidl",
+    "TCPSocketEvent.webidl",
+    "ToggleEvent.webidl",
+    "TrackEvent.webidl",
+    "UDPMessageEvent.webidl",
+    "UserProximityEvent.webidl",
+    "WebGLContextEvent.webidl",
+    "XRInputSourceEvent.webidl",
+    "XRInputSourcesChangeEvent.webidl",
+    "XRReferenceSpaceEvent.webidl",
+    "XRSessionEvent.webidl",
+]
+
+if CONFIG["MOZ_WEBRTC"]:
+    GENERATED_EVENTS_WEBIDL_FILES += [
+        "RTCDataChannelEvent.webidl",
+        "RTCDTMFToneChangeEvent.webidl",
+        "RTCPeerConnectionIceEvent.webidl",
+        "RTCTrackEvent.webidl",
+    ]
+
+if CONFIG["MOZ_WEBSPEECH"]:
+    GENERATED_EVENTS_WEBIDL_FILES += [
+        "SpeechRecognitionEvent.webidl",
+        "SpeechSynthesisErrorEvent.webidl",
+        "SpeechSynthesisEvent.webidl",
+    ]
+
+if CONFIG["ACCESSIBILITY"]:
+    WEBIDL_FILES += [
+        "AccessibleNode.webidl",
+    ]