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diff --git a/dom/webidl/BaseKeyframeTypes.webidl b/dom/webidl/BaseKeyframeTypes.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-compositeoperation-enumeration
+ * https://drafts.csswg.org/web-animations/#dictdef-basepropertyindexedkeyframe
+ * https://drafts.csswg.org/web-animations/#dictdef-basekeyframe
+ * https://drafts.csswg.org/web-animations/#dictdef-basecomputedkeyframe
+ *
+ * Copyright © 2016 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+enum CompositeOperation { "replace", "add", "accumulate" };
+
+// NOTE: The order of the values in this enum are important.
+//
+// We assume that CompositeOperation is a subset of CompositeOperationOrAuto so
+// that we can cast between the two types (provided the value is not "auto").
+//
+// If that assumption ceases to hold we will need to update the conversion
+// in KeyframeUtils::GetAnimationPropertiesFromKeyframes.
+enum CompositeOperationOrAuto { "replace", "add", "accumulate", "auto" };
+
+// The following dictionary types are not referred to by other .webidl files,
+// but we use it for manual JS->IDL and IDL->JS conversions in KeyframeEffect's
+// implementation.
+
+[GenerateInit]
+dictionary BasePropertyIndexedKeyframe {
+  (double? or sequence<double?>) offset = [];
+  (UTF8String or sequence<UTF8String>) easing = [];
+  (CompositeOperationOrAuto or sequence<CompositeOperationOrAuto>) composite = [];
+};
+
+[GenerateInit]
+dictionary BaseKeyframe {
+  double? offset = null;
+  UTF8String easing = "linear";
+  [Pref="dom.animations-api.compositing.enabled"]
+  CompositeOperationOrAuto composite = "auto";
+
+  // Non-standard extensions
+
+  // Member to allow testing when StyleAnimationValue::ComputeValues fails.
+  //
+  // Note that we currently only apply this to shorthand properties since
+  // it's easier to annotate shorthand property values and because we have
+  // only ever observed ComputeValues failing on shorthand values.
+  //
+  // Bug 1216844 should remove this member since after that bug is fixed we will
+  // have a well-defined behavior to use when animation endpoints are not
+  // available.
+  [ChromeOnly] boolean simulateComputeValuesFailure = false;
+};
+
+[GenerateConversionToJS]
+dictionary BaseComputedKeyframe : BaseKeyframe {
+  double computedOffset;
+};