diff -r 000000000000 -r 6474c204b198 dom/interfaces/events/nsIDOMEventListener.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/events/nsIDOMEventListener.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* -*- 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 "domstubs.idl"
+
+/**
+ * The nsIDOMEventListener interface is a callback interface for
+ * listening to events in the Document Object Model.
+ *
+ * For more information on this interface please see 
+ * http://www.w3.org/TR/DOM-Level-2-Events/
+ */
+
+[scriptable, function, uuid(df31c120-ded6-11d1-bd85-00805f8ae3f4)]
+interface nsIDOMEventListener : nsISupports
+{
+  /**
+   * This method is called whenever an event occurs of the type for which 
+   * the EventListener interface was registered.
+   *
+   * @param   evt The Event contains contextual information about the 
+   *              event. It also contains the stopPropagation and 
+   *              preventDefault methods which are used in determining the 
+   *              event's flow and default action.
+   */
+  void                      handleEvent(in nsIDOMEvent event);
+};