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diff --git a/dom/webidl/MediaStreamAudioSourceNode.webidl b/dom/webidl/MediaStreamAudioSourceNode.webidl
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+++ b/dom/webidl/MediaStreamAudioSourceNode.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://webaudio.github.io/web-audio-api/
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+dictionary MediaStreamAudioSourceOptions {
+    required MediaStream mediaStream;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface MediaStreamAudioSourceNode : AudioNode {
+  [Throws]
+  constructor(AudioContext context, MediaStreamAudioSourceOptions options);
+
+  [BinaryName="GetMediaStream"]
+  readonly attribute MediaStream mediaStream;
+};
+
+// Mozilla extensions
+MediaStreamAudioSourceNode includes AudioNodePassThrough;
+