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diff --git a/dom/webidl/MutationEvent.webidl b/dom/webidl/MutationEvent.webidl
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+++ b/dom/webidl/MutationEvent.webidl
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+/* -*- 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
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+interface MutationEvent : Event
+{
+  const unsigned short MODIFICATION = 1;
+  const unsigned short ADDITION     = 2;
+  const unsigned short REMOVAL      = 3;
+
+  readonly attribute Node?          relatedNode;
+  readonly attribute DOMString      prevValue;
+  readonly attribute DOMString      newValue;
+  readonly attribute DOMString      attrName;
+  readonly attribute unsigned short attrChange;
+
+  [Throws]
+  void initMutationEvent(DOMString type,
+                         boolean canBubble,
+                         boolean cancelable,
+                         Node? relatedNode,
+                         DOMString prevValue,
+                         DOMString newValue,
+                         DOMString attrName,
+                         unsigned short attrChange);
+};