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diff --git a/dom/webidl/KeyframeEffect.webidl b/dom/webidl/KeyframeEffect.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/#the-keyframeeffect-interfaces
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum IterationCompositeOperation {
+  "replace",
+  "accumulate"
+};
+
+dictionary KeyframeEffectOptions : EffectTiming {
+  [Pref="dom.animations-api.compositing.enabled"]
+  IterationCompositeOperation iterationComposite = "replace";
+  [Pref="dom.animations-api.compositing.enabled"]
+  CompositeOperation          composite = "replace";
+  DOMString?                  pseudoElement = null;
+};
+
+// KeyframeEffect should run in the caller's compartment to do custom
+// processing on the `keyframes` object.
+[Func="Document::IsWebAnimationsEnabled",
+ RunConstructorInCallerCompartment,
+ Exposed=Window]
+interface KeyframeEffect : AnimationEffect {
+  [Throws]
+  constructor(Element? target,
+              object? keyframes,
+              optional (unrestricted double or KeyframeEffectOptions) options = {});
+  [Throws]
+  constructor(KeyframeEffect source);
+
+  attribute Element?                  target;
+  [SetterThrows] attribute DOMString? pseudoElement;
+  [Pref="dom.animations-api.compositing.enabled"]
+  attribute IterationCompositeOperation     iterationComposite;
+  [Pref="dom.animations-api.compositing.enabled"]
+  attribute CompositeOperation              composite;
+  [Throws] sequence<object> getKeyframes();
+  [Throws] void             setKeyframes(object? keyframes);
+};
+
+// Non-standard extensions
+dictionary AnimationPropertyValueDetails {
+  required double             offset;
+           UTF8String         value;
+           UTF8String         easing;
+  required CompositeOperation composite;
+};
+
+dictionary AnimationPropertyDetails {
+  required DOMString                               property;
+  required boolean                                 runningOnCompositor;
+           DOMString                               warning;
+  required sequence<AnimationPropertyValueDetails> values;
+};
+
+partial interface KeyframeEffect {
+  [ChromeOnly, Throws] sequence<AnimationPropertyDetails> getProperties();
+};