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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://w3c.github.io/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 : AnimationEffectTimingProperties {
+  IterationCompositeOperation iterationComposite = "replace";
+  CompositeOperation          composite = "replace";
+  DOMString                   spacing = "distribute";
+};
+
+// Bug 1241783: For the constructor we use (Element or CSSPseudoElement)? for
+// the first argument since we cannot convert a mixin into a union type
+// automatically.
+[Func="nsDocument::IsWebAnimationsEnabled",
+ Constructor ((Element or CSSPseudoElement)? target,
+              object? keyframes,
+              optional (unrestricted double or KeyframeEffectOptions) options),
+ Constructor (KeyframeEffectReadOnly source)]
+interface KeyframeEffectReadOnly : AnimationEffectReadOnly {
+  // Bug 1241783: As with the constructor, we use (Element or CSSPseudoElement)?
+  // for the type of |target| instead of Animatable?
+  readonly attribute (Element or CSSPseudoElement)?  target;
+  readonly attribute IterationCompositeOperation iterationComposite;
+  readonly attribute CompositeOperation          composite;
+  readonly attribute DOMString                   spacing;
+
+  // We use object instead of ComputedKeyframe so that we can put the
+  // property-value pairs on the object.
+  [Throws] sequence<object> getKeyframes();
+};
+
+// Non-standard extensions
+dictionary AnimationPropertyValueDetails {
+  required double             offset;
+  required DOMString          value;
+           DOMString          easing;
+  required CompositeOperation composite;
+};
+
+dictionary AnimationPropertyDetails {
+  required DOMString                               property;
+  required boolean                                 runningOnCompositor;
+           DOMString                               warning;
+  required sequence<AnimationPropertyValueDetails> values;
+};
+
+partial interface KeyframeEffectReadOnly {
+  [ChromeOnly, Throws] sequence<AnimationPropertyDetails> getProperties();
+};
+
+[Func="nsDocument::IsWebAnimationsEnabled",
+ Constructor ((Element or CSSPseudoElement)? target,
+              object? keyframes,
+              optional (unrestricted double or KeyframeEffectOptions) options),
+ Constructor (KeyframeEffectReadOnly source)]
+interface KeyframeEffect : KeyframeEffectReadOnly {
+  inherit attribute (Element or CSSPseudoElement)? target;
+  inherit attribute IterationCompositeOperation    iterationComposite;
+  // Bug 1216844 - implement additive animation
+  // inherit attribute CompositeOperation          composite;
+  [SetterThrows]
+  inherit attribute DOMString                   spacing;
+  [Throws]
+  void setKeyframes (object? keyframes);
+};