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diff --git a/dom/webidl/DocumentOrShadowRoot.webidl b/dom/webidl/DocumentOrShadowRoot.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://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;
+};