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diff --git a/dom/webidl/HTMLVideoElement.webidl b/dom/webidl/HTMLVideoElement.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.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();
+};