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diff --git a/dom/webidl/ARIAMixin.webidl b/dom/webidl/ARIAMixin.webidl
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+++ b/dom/webidl/ARIAMixin.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
+ * https://w3c.github.io/aria/#ARIAMixin
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin ARIAMixin {
+  [Pref="accessibility.ARIAElementReflection.enabled", CEReactions]
+  attribute Element? ariaActiveDescendantElement;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? role;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaAtomic;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaAutoComplete;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaBrailleLabel;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaBrailleRoleDescription;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaBusy;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaChecked;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaColCount;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaColIndex;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaColIndexText;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaColSpan;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaCurrent;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaDescription;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaDisabled;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaExpanded;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaHasPopup;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaHidden;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaInvalid;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaKeyShortcuts;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaLabel;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaLevel;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaLive;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaModal;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaMultiLine;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaMultiSelectable;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaOrientation;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaPlaceholder;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaPosInSet;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaPressed;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaReadOnly;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaRelevant;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaRequired;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaRoleDescription;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaRowCount;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaRowIndex;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaRowIndexText;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaRowSpan;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaSelected;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaSetSize;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaSort;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaValueMax;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaValueMin;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaValueNow;
+
+  [CEReactions, SetterThrows]
+  attribute DOMString? ariaValueText;
+};