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diff --git a/dom/webidl/Event.webidl b/dom/webidl/Event.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was 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;
+};