diff -r 000000000000 -r 6474c204b198 dom/interfaces/events/nsIDOMCompositionEvent.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/events/nsIDOMCompositionEvent.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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 "nsIDOMUIEvent.idl"
+
+[scriptable, builtinclass, uuid(ef545b90-a5f4-471c-b4f8-03b5e0f6fda2)]
+interface nsIDOMCompositionEvent : nsIDOMUIEvent
+{
+  readonly attribute DOMString data;
+  readonly attribute DOMString locale;
+
+  void initCompositionEvent(in DOMString typeArg,
+                            in boolean canBubbleArg,
+                            in boolean cancelableArg,
+                            in nsIDOMWindow viewArg,
+                            in DOMString dataArg,
+                            in DOMString localeArg);
+};