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diff --git a/components/script/dom/webidls/EventHandler.webidl b/components/script/dom/webidls/EventHandler.webidl
new file mode 100644
index 00000000000..1278d7467fd
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+++ b/components/script/dom/webidls/EventHandler.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://www.whatwg.org/specs/web-apps/current-work/#eventhandler
+ *
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+[TreatNonObjectAsNull]
+callback EventHandlerNonNull = any (Event event);
+typedef EventHandlerNonNull? EventHandler;
+
+[TreatNonObjectAsNull]
+callback OnErrorEventHandlerNonNull = boolean ((Event or DOMString) event, optional DOMString source, optional unsigned long lineno, optional unsigned long column, optional any error);
+typedef OnErrorEventHandlerNonNull? OnErrorEventHandler;
+
+[NoInterfaceObject]
+interface GlobalEventHandlers {
+           attribute EventHandler onclick;
+           attribute EventHandler onload;
+};
+
+[NoInterfaceObject]
+interface WindowEventHandlers {
+           attribute EventHandler onunload;
+};
+
+// The spec has |attribute OnErrorEventHandler onerror;| on
+// GlobalEventHandlers, and calls the handler differently depending on
+// whether an ErrorEvent was fired. We don't do that, and until we do we'll
+// need to distinguish between onerror on Window or on nodes.
+
+/*[NoInterfaceObject]
+interface OnErrorEventHandlerForNodes {
+           attribute EventHandler onerror;
+};*/
+
+[NoInterfaceObject]
+interface OnErrorEventHandlerForWindow {
+           attribute OnErrorEventHandler onerror;
+};