diff -r 000000000000 -r 6474c204b198 dom/interfaces/events/nsIDOMMouseScrollEvent.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/events/nsIDOMMouseScrollEvent.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* -*- 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/. */
+
+#include "nsIDOMMouseEvent.idl"
+
+[scriptable, builtinclass, uuid(2bce5c03-5bed-4c22-8a6a-a3ac8f5563d7)]
+interface nsIDOMMouseScrollEvent : nsIDOMMouseEvent
+{
+  const long HORIZONTAL_AXIS = 1;
+  const long VERTICAL_AXIS = 2;
+
+  readonly attribute long axis;
+
+  void                initMouseScrollEvent(in DOMString typeArg,
+                                           in boolean canBubbleArg,
+                                           in boolean cancelableArg,
+                                           in nsIDOMWindow viewArg,
+                                           in long detailArg,
+                                           in long screenXArg,
+                                           in long screenYArg,
+                                           in long clientXArg,
+                                           in long clientYArg,
+                                           in boolean ctrlKeyArg,
+                                           in boolean altKeyArg,
+                                           in boolean shiftKeyArg,
+                                           in boolean metaKeyArg,
+                                           in unsigned short buttonArg,
+                                           in nsIDOMEventTarget relatedTargetArg,
+                                           in long axis);
+};