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diff --git a/dom/webidl/AudioParam.webidl b/dom/webidl/AudioParam.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.
+ */
+
+[Pref="dom.webaudio.enabled"]
+interface AudioParam {
+
+    attribute float value;
+    readonly attribute float defaultValue;
+
+    // Parameter automation. 
+    [Throws]
+    AudioParam setValueAtTime(float value, double startTime);
+    [Throws]
+    AudioParam linearRampToValueAtTime(float value, double endTime);
+    [Throws]
+    AudioParam exponentialRampToValueAtTime(float value, double endTime);
+
+    // Exponentially approach the target value with a rate having the given time constant. 
+    [Throws]
+    AudioParam setTargetAtTime(float target, double startTime, double timeConstant);
+
+    // Sets an array of arbitrary parameter values starting at time for the given duration. 
+    // The number of values will be scaled to fit into the desired duration. 
+    [Throws]
+    AudioParam setValueCurveAtTime(Float32Array values, double startTime, double duration);
+
+    // Cancels all scheduled parameter changes with times greater than or equal to startTime. 
+    [Throws]
+    AudioParam cancelScheduledValues(double startTime);
+
+};
+
+// Mozilla extension
+partial interface AudioParam {
+  // The ID of the AudioNode this AudioParam belongs to.
+  [ChromeOnly]
+  readonly attribute unsigned long parentNodeId;
+  // The name of the AudioParam
+  [ChromeOnly]
+  readonly attribute DOMString name;
+};