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diff --git a/dom/webidl/ShadowRoot.webidl b/dom/webidl/ShadowRoot.webidl
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+++ b/dom/webidl/ShadowRoot.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
+ * 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,
+ InstrumentedProps=(pictureInPictureElement)]
+interface ShadowRoot : DocumentFragment
+{
+  // Shadow DOM v1
+  readonly attribute ShadowRootMode mode;
+  readonly attribute boolean delegatesFocus;
+  readonly attribute SlotAssignmentMode slotAssignment;
+  [Pref="dom.webcomponents.shadowdom.declarative.enabled"]
+  readonly attribute boolean clonable;
+  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();
+};
+
+partial interface ShadowRoot {
+  // https://html.spec.whatwg.org/#dom-shadowroot-sethtmlunsafe
+  [Pref="dom.webcomponents.shadowdom.declarative.enabled"]
+  undefined setHTMLUnsafe(DOMString html);
+};
+
+ShadowRoot includes DocumentOrShadowRoot;