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diff --git a/dom/webidl/AnimationEffect.webidl b/dom/webidl/AnimationEffect.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://drafts.csswg.org/web-animations/#animationeffectreadonly
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum FillMode {
+  "none",
+  "forwards",
+  "backwards",
+  "both",
+  "auto"
+};
+
+enum PlaybackDirection {
+  "normal",
+  "reverse",
+  "alternate",
+  "alternate-reverse"
+};
+
+dictionary EffectTiming {
+  double                              delay = 0.0;
+  double                              endDelay = 0.0;
+  FillMode                            fill = "auto";
+  double                              iterationStart = 0.0;
+  unrestricted double                 iterations = 1.0;
+  (unrestricted double or DOMString)  duration = "auto";
+  PlaybackDirection                   direction = "normal";
+  UTF8String                          easing = "linear";
+};
+
+dictionary OptionalEffectTiming {
+  double                              delay;
+  double                              endDelay;
+  FillMode                            fill;
+  double                              iterationStart;
+  unrestricted double                 iterations;
+  (unrestricted double or DOMString)  duration;
+  PlaybackDirection                   direction;
+  UTF8String                          easing;
+};
+
+dictionary ComputedEffectTiming : EffectTiming {
+  unrestricted double   endTime = 0.0;
+  unrestricted double   activeDuration = 0.0;
+  double?               localTime = null;
+  double?               progress = null;
+  unrestricted double?  currentIteration = null;
+};
+
+[Func="Document::IsWebAnimationsEnabled",
+ Exposed=Window]
+interface AnimationEffect {
+  EffectTiming getTiming();
+  [BinaryName="getComputedTimingAsDict"]
+  ComputedEffectTiming getComputedTiming();
+  [Throws]
+  undefined updateTiming(optional OptionalEffectTiming timing = {});
+};