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diff --git a/dom/webidl/EventTarget.webidl b/dom/webidl/EventTarget.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.w3.org/TR/2012/WD-dom-20120105/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+
+dictionary EventListenerOptions {
+  boolean capture = false;
+  /* Setting to true make the listener be added to the system group. */
+  [Func="ThreadSafeIsChromeOrUAWidget"]
+  boolean mozSystemGroup = false;
+};
+
+dictionary AddEventListenerOptions : EventListenerOptions {
+  boolean passive;
+  boolean once = false;
+  AbortSignal signal;
+  [ChromeOnly]
+  boolean wantUntrusted;
+};
+
+[Exposed=*]
+interface EventTarget {
+  [Throws]
+  constructor();
+
+  /* Passing null for wantsUntrusted means "default behavior", which
+     differs in content and chrome.  In content that default boolean
+     value is true, while in chrome the default boolean value is
+     false. */
+  [Throws]
+  undefined addEventListener(DOMString type,
+                             EventListener? listener,
+                             optional (AddEventListenerOptions or boolean) options = {},
+                             optional boolean? wantsUntrusted = null);
+  [Throws]
+  undefined removeEventListener(DOMString type,
+                                EventListener? listener,
+                                optional (EventListenerOptions or boolean) options = {});
+  [Throws, NeedsCallerType]
+  boolean dispatchEvent(Event event);
+};
+
+// Mozilla extensions for use by JS-implemented event targets to
+// implement on* properties.
+partial interface EventTarget {
+  // The use of [TreatNonCallableAsNull] here is a bit of a hack: it just makes
+  // the codegen check whether the type involved is either
+  // [TreatNonCallableAsNull] or [TreatNonObjectAsNull] and if it is handle it
+  // accordingly.  In particular, it will NOT actually treat a non-null
+  // non-callable object as null here.
+  [ChromeOnly, Throws]
+  undefined setEventHandler(DOMString type,
+                            [TreatNonCallableAsNull] EventHandler handler);
+
+  [ChromeOnly]
+  EventHandler getEventHandler(DOMString type);
+};
+
+// Mozilla extension to make firing events on event targets from
+// chrome easier.  This returns the window which can be used to create
+// events to fire at this EventTarget, or null if there isn't one.
+partial interface EventTarget {
+  [ChromeOnly, Exposed=Window, BinaryName="ownerGlobalForBindings"]
+  readonly attribute WindowProxy? ownerGlobal;
+};