diff -r 000000000000 -r 6474c204b198 dom/webidl/StyleRuleChangeEvent.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/StyleRuleChangeEvent.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+/* -*- 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 CSSRule;
+
+[ChromeOnly, Constructor(DOMString type, optional StyleRuleChangeEventInit eventInitDict), HeaderFile="GeneratedEventClasses.h"]
+interface StyleRuleChangeEvent : Event
+{
+  readonly attribute CSSStyleSheet? stylesheet;
+  readonly attribute CSSRule? rule;
+};
+
+dictionary StyleRuleChangeEventInit : EventInit
+{
+  CSSStyleSheet? stylesheet = null;
+  CSSRule? rule = null;
+};