diff -r 000000000000 -r 6474c204b198 dom/webidl/IDBVersionChangeEvent.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/IDBVersionChangeEvent.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+/* -*- 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://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBVersionChangeEvent
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary IDBVersionChangeEventInit : EventInit {
+    unsigned long long  oldVersion = 0;
+    unsigned long long? newVersion = null;
+};
+
+[Constructor(DOMString type, optional IDBVersionChangeEventInit eventInitDict)]
+interface IDBVersionChangeEvent : Event {
+    readonly    attribute unsigned long long  oldVersion;
+    readonly    attribute unsigned long long? newVersion;
+};
+