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diff --git a/components/script/dom/webidls/CustomEvent.webidl b/components/script/dom/webidls/CustomEvent.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/.
+ *
+ * For more information on this interface please see
+ * http://dom.spec.whatwg.org/#interface-customevent
+ *
+ * To the extent possible under law, the editors have waived
+ * all copyright and related or neighboring rights to this work.
+ * In addition, as of 1 May 2014, the editors have made this specification
+ * available under the Open Web Foundation Agreement Version 1.0,
+ * which is available at
+ * http://www.openwebfoundation.org/legal/the-owf-1-0-agreements/owfa-1-0.
+ */
+
+[Constructor(DOMString type, optional CustomEventInit eventInitDict)/*,
+ Exposed=Window,Worker*/]
+interface CustomEvent : Event {
+  readonly attribute any detail;
+
+  void initCustomEvent(DOMString type, boolean bubbles, boolean cancelable, any detail);
+};
+
+dictionary CustomEventInit : EventInit {
+  any detail = null;
+};