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diff --git a/dom/webidl/EventHandler.webidl b/dom/webidl/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.
+ */
+[LegacyTreatNonObjectAsNull]
+callback EventHandlerNonNull = any (Event event);
+typedef EventHandlerNonNull? EventHandler;
+
+[LegacyTreatNonObjectAsNull]
+callback OnBeforeUnloadEventHandlerNonNull = DOMString? (Event event);
+typedef OnBeforeUnloadEventHandlerNonNull? OnBeforeUnloadEventHandler;
+
+[LegacyTreatNonObjectAsNull]
+callback OnErrorEventHandlerNonNull = any ((Event or DOMString) event, optional DOMString source, optional unsigned long lineno, optional unsigned long column, optional any error);
+typedef OnErrorEventHandlerNonNull? OnErrorEventHandler;
+
+interface mixin GlobalEventHandlers {
+           attribute EventHandler onabort;
+           attribute EventHandler onblur;
+// We think the spec is wrong here. See OnErrorEventHandlerForNodes/Window
+// below.
+//         attribute OnErrorEventHandler onerror;
+           attribute EventHandler onfocus;
+           //(Not implemented)attribute EventHandler oncancel;
+           attribute EventHandler onauxclick;
+           [Pref="dom.input_events.beforeinput.enabled"]
+           attribute EventHandler onbeforeinput;
+           [Pref="dom.element.popover.enabled"]
+           attribute EventHandler onbeforetoggle;
+           attribute EventHandler oncanplay;
+           attribute EventHandler oncanplaythrough;
+           attribute EventHandler onchange;
+           attribute EventHandler onclick;
+           attribute EventHandler onclose;
+           attribute EventHandler oncontextmenu;
+           attribute EventHandler oncopy;
+           attribute EventHandler oncuechange;
+           attribute EventHandler oncut;
+           attribute EventHandler ondblclick;
+           attribute EventHandler ondrag;
+           attribute EventHandler ondragend;
+           attribute EventHandler ondragenter;
+           [Func="Event::IsDragExitEnabled"]
+           attribute EventHandler ondragexit;
+           attribute EventHandler ondragleave;
+           attribute EventHandler ondragover;
+           attribute EventHandler ondragstart;
+           attribute EventHandler ondrop;
+           attribute EventHandler ondurationchange;
+           attribute EventHandler onemptied;
+           attribute EventHandler onended;
+           attribute EventHandler onformdata;
+           attribute EventHandler oninput;
+           attribute EventHandler oninvalid;
+           attribute EventHandler onkeydown;
+           attribute EventHandler onkeypress;
+           attribute EventHandler onkeyup;
+           attribute EventHandler onload;
+           attribute EventHandler onloadeddata;
+           attribute EventHandler onloadedmetadata;
+           attribute EventHandler onloadstart;
+           attribute EventHandler onmousedown;
+  [LegacyLenientThis] attribute EventHandler onmouseenter;
+  [LegacyLenientThis] attribute EventHandler onmouseleave;
+           attribute EventHandler onmousemove;
+           attribute EventHandler onmouseout;
+           attribute EventHandler onmouseover;
+           attribute EventHandler onmouseup;
+           attribute EventHandler onwheel;
+           attribute EventHandler onpaste;
+           attribute EventHandler onpause;
+           attribute EventHandler onplay;
+           attribute EventHandler onplaying;
+           attribute EventHandler onprogress;
+           attribute EventHandler onratechange;
+           attribute EventHandler onreset;
+           attribute EventHandler onresize;
+           attribute EventHandler onscroll;
+           [Pref="apz.scrollend-event.content.enabled"]
+           attribute EventHandler onscrollend;
+           attribute EventHandler onsecuritypolicyviolation;
+           attribute EventHandler onseeked;
+           attribute EventHandler onseeking;
+           attribute EventHandler onselect;
+           attribute EventHandler onslotchange;
+           //(Not implemented)attribute EventHandler onsort;
+           attribute EventHandler onstalled;
+           attribute EventHandler onsubmit;
+           attribute EventHandler onsuspend;
+           attribute EventHandler ontimeupdate;
+           attribute EventHandler onvolumechange;
+           attribute EventHandler onwaiting;
+
+           attribute EventHandler onselectstart;
+           attribute EventHandler onselectionchange;
+
+           attribute EventHandler ontoggle;
+
+           // Pointer events handlers
+           attribute EventHandler onpointercancel;
+           attribute EventHandler onpointerdown;
+           attribute EventHandler onpointerup;
+           attribute EventHandler onpointermove;
+           attribute EventHandler onpointerout;
+           attribute EventHandler onpointerover;
+           attribute EventHandler onpointerenter;
+           attribute EventHandler onpointerleave;
+           attribute EventHandler ongotpointercapture;
+           attribute EventHandler onlostpointercapture;
+
+           // Mozilla-specific handlers. Unprefixed handlers live in
+           // Document rather than here.
+           [Deprecated="MozfullscreenchangeDeprecatedPrefix"]
+           attribute EventHandler onmozfullscreenchange;
+           [Deprecated="MozfullscreenerrorDeprecatedPrefix"]
+           attribute EventHandler onmozfullscreenerror;
+
+           // CSS-Animation and CSS-Transition handlers.
+           attribute EventHandler onanimationcancel;
+           attribute EventHandler onanimationend;
+           attribute EventHandler onanimationiteration;
+           attribute EventHandler onanimationstart;
+           attribute EventHandler ontransitioncancel;
+           attribute EventHandler ontransitionend;
+           attribute EventHandler ontransitionrun;
+           attribute EventHandler ontransitionstart;
+
+           // CSS-Animation and CSS-Transition legacy handlers.
+           // This handler isn't standard.
+           [BinaryName="onwebkitAnimationEnd"]
+           attribute EventHandler onwebkitanimationend;
+           [BinaryName="onwebkitAnimationIteration"]
+           attribute EventHandler onwebkitanimationiteration;
+           [BinaryName="onwebkitAnimationStart"]
+           attribute EventHandler onwebkitanimationstart;
+           [BinaryName="onwebkitTransitionEnd"]
+           attribute EventHandler onwebkittransitionend;
+};
+
+interface mixin WindowEventHandlers {
+           attribute EventHandler onafterprint;
+           attribute EventHandler onbeforeprint;
+           attribute OnBeforeUnloadEventHandler onbeforeunload;
+           attribute EventHandler onhashchange;
+           attribute EventHandler onlanguagechange;
+           attribute EventHandler onmessage;
+           attribute EventHandler onmessageerror;
+           attribute EventHandler onoffline;
+           attribute EventHandler ononline;
+           attribute EventHandler onpagehide;
+           attribute EventHandler onpageshow;
+           attribute EventHandler onpopstate;
+           attribute EventHandler onrejectionhandled;
+           attribute EventHandler onstorage;
+           attribute EventHandler onunhandledrejection;
+           attribute EventHandler onunload;
+};
+
+// https://w3c.github.io/gamepad/#extensions-to-the-windoweventhandlers-interface-mixin
+partial interface mixin WindowEventHandlers {
+  attribute EventHandler ongamepadconnected;
+  attribute EventHandler ongamepaddisconnected;
+};
+
+// 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.
+
+interface mixin OnErrorEventHandlerForNodes {
+           attribute EventHandler onerror;
+};
+
+interface mixin OnErrorEventHandlerForWindow {
+           attribute OnErrorEventHandler onerror;
+};