diff -r 000000000000 -r 6474c204b198 dom/webidl/MouseScrollEvent.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/MouseScrollEvent.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* -*- 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/.
+ */
+
+interface WindowProxy;
+
+interface MouseScrollEvent : MouseEvent
+{
+  const long HORIZONTAL_AXIS = 1;
+  const long VERTICAL_AXIS = 2;
+
+  readonly attribute long axis;
+
+  [Throws]
+  void initMouseScrollEvent(DOMString type,
+                            boolean canBubble,
+                            boolean cancelable,
+                            WindowProxy? view,
+                            long detail,
+                            long screenX,
+                            long screenY,
+                            long clientX,
+                            long clientY,
+                            boolean ctrlKey,
+                            boolean altKey,
+                            boolean shiftKey,
+                            boolean metaKey,
+                            unsigned short button,
+                            EventTarget? relatedTarget,
+                            long axis);
+};