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diff --git a/dom/webidl/HTMLDialogElement.webidl b/dom/webidl/HTMLDialogElement.webidl
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+++ b/dom/webidl/HTMLDialogElement.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://html.spec.whatwg.org/multipage/forms.html#the-dialog-element
+ *
+ * © 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.
+ */
+
+[Pref="dom.dialog_element.enabled"]
+interface HTMLDialogElement : HTMLElement {
+  [SetterThrows] attribute boolean open;
+  attribute DOMString returnValue;
+
+  void show();
+  [Throws] void showModal();
+
+  void close(optional DOMString returnValue);
+};