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diff --git a/dom/webidl/Animation.webidl b/dom/webidl/Animation.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://w3c.github.io/web-animations/#the-animation-interface
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum AnimationPlayState { "idle", "pending", "running", "paused", "finished" };
+
+[Func="nsDocument::IsElementAnimateEnabled",
+ Constructor (optional AnimationEffectReadOnly? effect = null,
+              optional AnimationTimeline? timeline)]
+interface Animation : EventTarget {
+  attribute DOMString id;
+  [Func="nsDocument::IsWebAnimationsEnabled", Pure]
+  attribute AnimationEffectReadOnly? effect;
+  [Func="nsDocument::IsWebAnimationsEnabled"]
+  attribute AnimationTimeline? timeline;
+  [BinaryName="startTimeAsDouble"]
+  attribute double? startTime;
+  [SetterThrows, BinaryName="currentTimeAsDouble"]
+  attribute double? currentTime;
+
+           attribute double             playbackRate;
+  [BinaryName="playStateFromJS"]
+  readonly attribute AnimationPlayState playState;
+  [Func="nsDocument::IsWebAnimationsEnabled", Throws]
+  readonly attribute Promise<Animation> ready;
+  [Func="nsDocument::IsWebAnimationsEnabled", Throws]
+  readonly attribute Promise<Animation> finished;
+           attribute EventHandler       onfinish;
+           attribute EventHandler       oncancel;
+  void cancel ();
+  [Throws]
+  void finish ();
+  [Throws, BinaryName="playFromJS"]
+  void play ();
+  [Throws, BinaryName="pauseFromJS"]
+  void pause ();
+  [Throws]
+  void reverse ();
+};
+
+// Non-standard extensions
+partial interface Animation {
+  [ChromeOnly] readonly attribute boolean isRunningOnCompositor;
+};