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diff --git a/dom/webidl/AnalyserNode.webidl b/dom/webidl/AnalyserNode.webidl
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+++ b/dom/webidl/AnalyserNode.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 AnalyserOptions : AudioNodeOptions {
+             unsigned long fftSize = 2048;
+             double        maxDecibels = -30;
+             double        minDecibels = -100;
+             double        smoothingTimeConstant = 0.8;
+};
+
+[Pref="dom.webaudio.enabled",
+ Exposed=Window]
+interface AnalyserNode : AudioNode {
+    [Throws]
+    constructor(BaseAudioContext context,
+                optional AnalyserOptions options = {});
+
+    // Real-time frequency-domain data
+    undefined getFloatFrequencyData(Float32Array array);
+    undefined getByteFrequencyData(Uint8Array array);
+
+    // Real-time waveform data
+    undefined getFloatTimeDomainData(Float32Array array);
+    undefined getByteTimeDomainData(Uint8Array array);
+
+    [SetterThrows, Pure]
+    attribute unsigned long fftSize;
+    [Pure]
+    readonly attribute unsigned long frequencyBinCount;
+
+    [SetterThrows, Pure]
+    attribute double minDecibels;
+    [SetterThrows, Pure]
+    attribute double maxDecibels;
+
+    [SetterThrows, Pure]
+    attribute double smoothingTimeConstant;
+
+};
+
+// Mozilla extension
+AnalyserNode includes AudioNodePassThrough;