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diff --git a/dom/webidl/FontFaceSource.webidl b/dom/webidl/FontFaceSource.webidl
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+++ b/dom/webidl/FontFaceSource.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://dev.w3.org/csswg/css-font-loading/#font-face-source
+ *
+ * Copyright © 2014 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+interface mixin FontFaceSource {
+  [Func="FontFaceSet::IsEnabled", Throws]
+  readonly attribute FontFaceSet fonts;
+};