diff -r 000000000000 -r 6474c204b198 dom/webidl/FocusEvent.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/FocusEvent.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+/* -*- 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://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString typeArg, optional FocusEventInit focusEventInitDict)]
+interface FocusEvent : UIEvent {
+  // Introduced in DOM Level 3:
+  readonly attribute EventTarget?   relatedTarget;
+};
+
+dictionary FocusEventInit : UIEventInit {
+    EventTarget? relatedTarget = null;
+};