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diff --git a/dom/webidl/AudioContext.webidl b/dom/webidl/AudioContext.webidl
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+++ b/dom/webidl/AudioContext.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.
+ */
+
+callback DecodeSuccessCallback = void (AudioBuffer decodedData);
+callback DecodeErrorCallback = void ();
+
+enum AudioContextState {
+    "suspended",
+    "running",
+    "closed"
+};
+
+dictionary PeriodicWaveConstraints {
+  boolean disableNormalization = false;
+};
+
+[Constructor,
+ Constructor(AudioChannel audioChannelType),
+ Pref="dom.webaudio.enabled"]
+interface AudioContext : EventTarget {
+
+    readonly attribute AudioDestinationNode destination;
+    readonly attribute float sampleRate;
+    readonly attribute double currentTime;
+    readonly attribute AudioListener listener;
+    readonly attribute AudioContextState state;
+    [Throws]
+    Promise<void> suspend();
+    [Throws]
+    Promise<void> resume();
+    [Throws]
+    Promise<void> close();
+    attribute EventHandler onstatechange;
+
+    [NewObject, Throws]
+    AudioBuffer createBuffer(unsigned long numberOfChannels, unsigned long length, float sampleRate);
+
+    [Throws]
+    Promise<AudioBuffer> decodeAudioData(ArrayBuffer audioData,
+                                         optional DecodeSuccessCallback successCallback,
+                                         optional DecodeErrorCallback errorCallback);
+
+    // AudioNode creation
+    [NewObject, Throws]
+    AudioBufferSourceNode createBufferSource();
+
+    [NewObject, Throws]
+    ConstantSourceNode createConstantSource();
+
+    [NewObject, Throws]
+    MediaStreamAudioDestinationNode createMediaStreamDestination();
+
+    [NewObject, Throws]
+    ScriptProcessorNode createScriptProcessor(optional unsigned long bufferSize = 0,
+                                              optional unsigned long numberOfInputChannels = 2,
+                                              optional unsigned long numberOfOutputChannels = 2);
+
+    [NewObject, Throws]
+    StereoPannerNode createStereoPanner();
+    [NewObject, Throws]
+    AnalyserNode createAnalyser();
+    [NewObject, Throws, UnsafeInPrerendering]
+    MediaElementAudioSourceNode createMediaElementSource(HTMLMediaElement mediaElement);
+    [NewObject, Throws, UnsafeInPrerendering]
+    MediaStreamAudioSourceNode createMediaStreamSource(MediaStream mediaStream);
+    [NewObject, Throws]
+    GainNode createGain();
+    [NewObject, Throws]
+    DelayNode createDelay(optional double maxDelayTime = 1);
+    [NewObject, Throws]
+    BiquadFilterNode createBiquadFilter();
+    [NewObject, Throws]
+    IIRFilterNode createIIRFilter(sequence<double> feedforward, sequence<double> feedback);
+    [NewObject, Throws]
+    WaveShaperNode createWaveShaper();
+    [NewObject, Throws]
+    PannerNode createPanner();
+    [NewObject, Throws]
+    ConvolverNode createConvolver();
+
+    [NewObject, Throws]
+    ChannelSplitterNode createChannelSplitter(optional unsigned long numberOfOutputs = 6);
+    [NewObject, Throws]
+    ChannelMergerNode createChannelMerger(optional unsigned long numberOfInputs = 6);
+
+    [NewObject, Throws]
+    DynamicsCompressorNode createDynamicsCompressor();
+
+    [NewObject, Throws]
+    OscillatorNode createOscillator();
+    [NewObject, Throws]
+    PeriodicWave createPeriodicWave(Float32Array real, Float32Array imag, optional PeriodicWaveConstraints constraints);
+
+};
+
+// Mozilla extensions
+partial interface AudioContext {
+  // Read AudioChannel.webidl for more information about this attribute.
+  [Pref="media.useAudioChannelAPI"]
+  readonly attribute AudioChannel mozAudioChannelType;
+
+  // These 2 events are dispatched when the AudioContext object is muted by
+  // the AudioChannelService. It's call 'interrupt' because when this event is
+  // dispatched on a HTMLMediaElement, the audio stream is paused.
+  [Pref="media.useAudioChannelAPI"]
+  attribute EventHandler onmozinterruptbegin;
+
+  [Pref="media.useAudioChannelAPI"]
+  attribute EventHandler onmozinterruptend;
+
+  // This method is for test only.
+  [ChromeOnly] AudioChannel testAudioChannelInAudioNodeStream();
+};