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diff --git a/testing/web-platform/tests/interfaces/webaudio.idl b/testing/web-platform/tests/interfaces/webaudio.idl
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+++ b/testing/web-platform/tests/interfaces/webaudio.idl
@@ -0,0 +1,674 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Audio API (https://webaudio.github.io/web-audio-api/)
+
+enum AudioContextState {
+    "suspended",
+    "running",
+    "closed"
+};
+
+callback DecodeErrorCallback = undefined (DOMException error);
+
+callback DecodeSuccessCallback = undefined (AudioBuffer decodedData);
+
+[Exposed=Window]
+interface BaseAudioContext : EventTarget {
+    readonly attribute AudioDestinationNode destination;
+    readonly attribute float sampleRate;
+    readonly attribute double currentTime;
+    readonly attribute AudioListener listener;
+    readonly attribute AudioContextState state;
+    [SameObject, SecureContext]
+    readonly attribute AudioWorklet audioWorklet;
+    attribute EventHandler onstatechange;
+
+    AnalyserNode createAnalyser ();
+    BiquadFilterNode createBiquadFilter ();
+    AudioBuffer createBuffer (unsigned long numberOfChannels,
+                              unsigned long length,
+                              float sampleRate);
+    AudioBufferSourceNode createBufferSource ();
+    ChannelMergerNode createChannelMerger (optional unsigned long numberOfInputs = 6);
+    ChannelSplitterNode createChannelSplitter (
+        optional unsigned long numberOfOutputs = 6);
+    ConstantSourceNode createConstantSource ();
+    ConvolverNode createConvolver ();
+    DelayNode createDelay (optional double maxDelayTime = 1.0);
+    DynamicsCompressorNode createDynamicsCompressor ();
+    GainNode createGain ();
+    IIRFilterNode createIIRFilter (sequence<double> feedforward,
+                                   sequence<double> feedback);
+    OscillatorNode createOscillator ();
+    PannerNode createPanner ();
+    PeriodicWave createPeriodicWave (sequence<float> real,
+                                     sequence<float> imag,
+                                     optional PeriodicWaveConstraints constraints = {});
+    ScriptProcessorNode createScriptProcessor(
+        optional unsigned long bufferSize = 0,
+        optional unsigned long numberOfInputChannels = 2,
+        optional unsigned long numberOfOutputChannels = 2);
+    StereoPannerNode createStereoPanner ();
+    WaveShaperNode createWaveShaper ();
+
+    Promise<AudioBuffer> decodeAudioData (
+        ArrayBuffer audioData,
+        optional DecodeSuccessCallback? successCallback,
+        optional DecodeErrorCallback? errorCallback);
+};
+
+enum AudioContextLatencyCategory {
+        "balanced",
+        "interactive",
+        "playback"
+};
+
+enum AudioSinkType {
+    "none"
+};
+
+[Exposed=Window]
+interface AudioContext : BaseAudioContext {
+    constructor (optional AudioContextOptions contextOptions = {});
+    readonly attribute double baseLatency;
+    readonly attribute double outputLatency;
+    [SecureContext] readonly attribute (DOMString or AudioSinkInfo) sinkId;
+    [SecureContext] readonly attribute AudioRenderCapacity renderCapacity;
+    attribute EventHandler onsinkchange;
+    AudioTimestamp getOutputTimestamp ();
+    Promise<undefined> resume ();
+    Promise<undefined> suspend ();
+    Promise<undefined> close ();
+    [SecureContext] Promise<undefined> setSinkId ((DOMString or AudioSinkOptions) sinkId);
+    MediaElementAudioSourceNode createMediaElementSource (HTMLMediaElement mediaElement);
+    MediaStreamAudioSourceNode createMediaStreamSource (MediaStream mediaStream);
+    MediaStreamTrackAudioSourceNode createMediaStreamTrackSource (
+        MediaStreamTrack mediaStreamTrack);
+    MediaStreamAudioDestinationNode createMediaStreamDestination ();
+};
+
+dictionary AudioContextOptions {
+    (AudioContextLatencyCategory or double) latencyHint = "interactive";
+    float sampleRate;
+    (DOMString or AudioSinkOptions) sinkId;
+};
+
+dictionary AudioSinkOptions {
+    required AudioSinkType type;
+};
+
+[Exposed=Window]
+interface AudioSinkInfo {
+    readonly attribute AudioSinkType type;
+};
+
+dictionary AudioTimestamp {
+    double contextTime;
+    DOMHighResTimeStamp performanceTime;
+};
+
+[Exposed=Window]
+interface AudioRenderCapacity : EventTarget {
+    undefined start(optional AudioRenderCapacityOptions options = {});
+        undefined stop();
+        attribute EventHandler onupdate;
+};
+
+dictionary AudioRenderCapacityOptions {
+        double updateInterval = 1;
+};
+
+[Exposed=Window]
+interface AudioRenderCapacityEvent : Event {
+    constructor (DOMString type, optional AudioRenderCapacityEventInit eventInitDict = {});
+        readonly attribute double timestamp;
+        readonly attribute double averageLoad;
+        readonly attribute double peakLoad;
+        readonly attribute double underrunRatio;
+};
+
+dictionary AudioRenderCapacityEventInit : EventInit {
+    double timestamp = 0;
+    double averageLoad = 0;
+    double peakLoad = 0;
+    double underrunRatio = 0;
+};
+
+[Exposed=Window]
+interface OfflineAudioContext : BaseAudioContext {
+    constructor(OfflineAudioContextOptions contextOptions);
+    constructor(unsigned long numberOfChannels, unsigned long length, float sampleRate);
+    Promise<AudioBuffer> startRendering();
+    Promise<undefined> resume();
+    Promise<undefined> suspend(double suspendTime);
+    readonly attribute unsigned long length;
+    attribute EventHandler oncomplete;
+};
+
+dictionary OfflineAudioContextOptions {
+    unsigned long numberOfChannels = 1;
+    required unsigned long length;
+    required float sampleRate;
+};
+
+[Exposed=Window]
+interface OfflineAudioCompletionEvent : Event {
+    constructor (DOMString type, OfflineAudioCompletionEventInit eventInitDict);
+    readonly attribute AudioBuffer renderedBuffer;
+};
+
+dictionary OfflineAudioCompletionEventInit : EventInit {
+    required AudioBuffer renderedBuffer;
+};
+
+[Exposed=Window]
+interface AudioBuffer {
+    constructor (AudioBufferOptions options);
+    readonly attribute float sampleRate;
+    readonly attribute unsigned long length;
+    readonly attribute double duration;
+    readonly attribute unsigned long numberOfChannels;
+    Float32Array getChannelData (unsigned long channel);
+    undefined copyFromChannel (Float32Array destination,
+                               unsigned long channelNumber,
+                               optional unsigned long bufferOffset = 0);
+    undefined copyToChannel (Float32Array source,
+                             unsigned long channelNumber,
+                             optional unsigned long bufferOffset = 0);
+};
+
+dictionary AudioBufferOptions {
+    unsigned long numberOfChannels = 1;
+    required unsigned long length;
+    required float sampleRate;
+};
+
+[Exposed=Window]
+interface AudioNode : EventTarget {
+    AudioNode connect (AudioNode destinationNode,
+                       optional unsigned long output = 0,
+                       optional unsigned long input = 0);
+    undefined connect (AudioParam destinationParam, optional unsigned long output = 0);
+    undefined disconnect ();
+    undefined disconnect (unsigned long output);
+    undefined disconnect (AudioNode destinationNode);
+    undefined disconnect (AudioNode destinationNode, unsigned long output);
+    undefined disconnect (AudioNode destinationNode,
+                          unsigned long output,
+                          unsigned long input);
+    undefined disconnect (AudioParam destinationParam);
+    undefined disconnect (AudioParam destinationParam, unsigned long output);
+    readonly attribute BaseAudioContext context;
+    readonly attribute unsigned long numberOfInputs;
+    readonly attribute unsigned long numberOfOutputs;
+    attribute unsigned long channelCount;
+    attribute ChannelCountMode channelCountMode;
+    attribute ChannelInterpretation channelInterpretation;
+};
+
+enum ChannelCountMode {
+    "max",
+    "clamped-max",
+    "explicit"
+};
+
+enum ChannelInterpretation {
+    "speakers",
+    "discrete"
+};
+
+dictionary AudioNodeOptions {
+    unsigned long channelCount;
+    ChannelCountMode channelCountMode;
+    ChannelInterpretation channelInterpretation;
+};
+
+enum AutomationRate {
+    "a-rate",
+    "k-rate"
+};
+
+[Exposed=Window]
+interface AudioParam {
+    attribute float value;
+    attribute AutomationRate automationRate;
+    readonly attribute float defaultValue;
+    readonly attribute float minValue;
+    readonly attribute float maxValue;
+    AudioParam setValueAtTime (float value, double startTime);
+    AudioParam linearRampToValueAtTime (float value, double endTime);
+    AudioParam exponentialRampToValueAtTime (float value, double endTime);
+    AudioParam setTargetAtTime (float target, double startTime, float timeConstant);
+    AudioParam setValueCurveAtTime (sequence<float> values,
+                                    double startTime,
+                                    double duration);
+    AudioParam cancelScheduledValues (double cancelTime);
+    AudioParam cancelAndHoldAtTime (double cancelTime);
+};
+
+[Exposed=Window]
+interface AudioScheduledSourceNode : AudioNode {
+    attribute EventHandler onended;
+    undefined start(optional double when = 0);
+    undefined stop(optional double when = 0);
+};
+
+[Exposed=Window]
+interface AnalyserNode : AudioNode {
+    constructor (BaseAudioContext context, optional AnalyserOptions options = {});
+    undefined getFloatFrequencyData (Float32Array array);
+    undefined getByteFrequencyData (Uint8Array array);
+    undefined getFloatTimeDomainData (Float32Array array);
+    undefined getByteTimeDomainData (Uint8Array array);
+    attribute unsigned long fftSize;
+    readonly attribute unsigned long frequencyBinCount;
+    attribute double minDecibels;
+    attribute double maxDecibels;
+    attribute double smoothingTimeConstant;
+};
+
+dictionary AnalyserOptions : AudioNodeOptions {
+    unsigned long fftSize = 2048;
+    double maxDecibels = -30;
+    double minDecibels = -100;
+    double smoothingTimeConstant = 0.8;
+};
+
+[Exposed=Window]
+interface AudioBufferSourceNode : AudioScheduledSourceNode {
+    constructor (BaseAudioContext context,
+                 optional AudioBufferSourceOptions options = {});
+    attribute AudioBuffer? buffer;
+    readonly attribute AudioParam playbackRate;
+    readonly attribute AudioParam detune;
+    attribute boolean loop;
+    attribute double loopStart;
+    attribute double loopEnd;
+    undefined start (optional double when = 0,
+                     optional double offset,
+                     optional double duration);
+};
+
+dictionary AudioBufferSourceOptions {
+    AudioBuffer? buffer;
+    float detune = 0;
+    boolean loop = false;
+    double loopEnd = 0;
+    double loopStart = 0;
+    float playbackRate = 1;
+};
+
+[Exposed=Window]
+interface AudioDestinationNode : AudioNode {
+    readonly attribute unsigned long maxChannelCount;
+};
+
+[Exposed=Window]
+interface AudioListener {
+    readonly attribute AudioParam positionX;
+    readonly attribute AudioParam positionY;
+    readonly attribute AudioParam positionZ;
+    readonly attribute AudioParam forwardX;
+    readonly attribute AudioParam forwardY;
+    readonly attribute AudioParam forwardZ;
+    readonly attribute AudioParam upX;
+    readonly attribute AudioParam upY;
+    readonly attribute AudioParam upZ;
+    undefined setPosition (float x, float y, float z);
+    undefined setOrientation (float x, float y, float z, float xUp, float yUp, float zUp);
+};
+
+[Exposed=Window]
+interface AudioProcessingEvent : Event {
+    constructor (DOMString type, AudioProcessingEventInit eventInitDict);
+    readonly attribute double playbackTime;
+    readonly attribute AudioBuffer inputBuffer;
+    readonly attribute AudioBuffer outputBuffer;
+};
+
+dictionary AudioProcessingEventInit : EventInit {
+    required double playbackTime;
+    required AudioBuffer inputBuffer;
+    required AudioBuffer outputBuffer;
+};
+
+enum BiquadFilterType {
+    "lowpass",
+    "highpass",
+    "bandpass",
+    "lowshelf",
+    "highshelf",
+    "peaking",
+    "notch",
+    "allpass"
+};
+
+[Exposed=Window]
+interface BiquadFilterNode : AudioNode {
+    constructor (BaseAudioContext context, optional BiquadFilterOptions options = {});
+    attribute BiquadFilterType type;
+    readonly attribute AudioParam frequency;
+    readonly attribute AudioParam detune;
+    readonly attribute AudioParam Q;
+    readonly attribute AudioParam gain;
+    undefined getFrequencyResponse (Float32Array frequencyHz,
+                                    Float32Array magResponse,
+                                    Float32Array phaseResponse);
+};
+
+dictionary BiquadFilterOptions : AudioNodeOptions {
+    BiquadFilterType type = "lowpass";
+    float Q = 1;
+    float detune = 0;
+    float frequency = 350;
+    float gain = 0;
+};
+
+[Exposed=Window]
+interface ChannelMergerNode : AudioNode {
+    constructor (BaseAudioContext context, optional ChannelMergerOptions options = {});
+};
+
+dictionary ChannelMergerOptions : AudioNodeOptions {
+    unsigned long numberOfInputs = 6;
+};
+
+[Exposed=Window]
+interface ChannelSplitterNode : AudioNode {
+    constructor (BaseAudioContext context, optional ChannelSplitterOptions options = {});
+};
+
+dictionary ChannelSplitterOptions : AudioNodeOptions {
+    unsigned long numberOfOutputs = 6;
+};
+
+[Exposed=Window]
+interface ConstantSourceNode : AudioScheduledSourceNode {
+    constructor (BaseAudioContext context, optional ConstantSourceOptions options = {});
+    readonly attribute AudioParam offset;
+};
+
+dictionary ConstantSourceOptions {
+    float offset = 1;
+};
+
+[Exposed=Window]
+interface ConvolverNode : AudioNode {
+    constructor (BaseAudioContext context, optional ConvolverOptions options = {});
+    attribute AudioBuffer? buffer;
+    attribute boolean normalize;
+};
+
+dictionary ConvolverOptions : AudioNodeOptions {
+    AudioBuffer? buffer;
+    boolean disableNormalization = false;
+};
+
+[Exposed=Window]
+interface DelayNode : AudioNode {
+    constructor (BaseAudioContext context, optional DelayOptions options = {});
+    readonly attribute AudioParam delayTime;
+};
+
+dictionary DelayOptions : AudioNodeOptions {
+    double maxDelayTime = 1;
+    double delayTime = 0;
+};
+
+[Exposed=Window]
+interface DynamicsCompressorNode : AudioNode {
+    constructor (BaseAudioContext context,
+                 optional DynamicsCompressorOptions options = {});
+    readonly attribute AudioParam threshold;
+    readonly attribute AudioParam knee;
+    readonly attribute AudioParam ratio;
+    readonly attribute float reduction;
+    readonly attribute AudioParam attack;
+    readonly attribute AudioParam release;
+};
+
+dictionary DynamicsCompressorOptions : AudioNodeOptions {
+    float attack = 0.003;
+    float knee = 30;
+    float ratio = 12;
+    float release = 0.25;
+    float threshold = -24;
+};
+
+[Exposed=Window]
+interface GainNode : AudioNode {
+    constructor (BaseAudioContext context, optional GainOptions options = {});
+    readonly attribute AudioParam gain;
+};
+
+dictionary GainOptions : AudioNodeOptions {
+    float gain = 1.0;
+};
+
+[Exposed=Window]
+interface IIRFilterNode : AudioNode {
+    constructor (BaseAudioContext context, IIRFilterOptions options);
+    undefined getFrequencyResponse (Float32Array frequencyHz,
+                                    Float32Array magResponse,
+                                    Float32Array phaseResponse);
+};
+
+dictionary IIRFilterOptions : AudioNodeOptions {
+    required sequence<double> feedforward;
+    required sequence<double> feedback;
+};
+
+[Exposed=Window]
+interface MediaElementAudioSourceNode : AudioNode {
+    constructor (AudioContext context, MediaElementAudioSourceOptions options);
+    [SameObject] readonly attribute HTMLMediaElement mediaElement;
+};
+
+dictionary MediaElementAudioSourceOptions {
+    required HTMLMediaElement mediaElement;
+};
+
+[Exposed=Window]
+interface MediaStreamAudioDestinationNode : AudioNode {
+    constructor (AudioContext context, optional AudioNodeOptions options = {});
+    readonly attribute MediaStream stream;
+};
+
+[Exposed=Window]
+interface MediaStreamAudioSourceNode : AudioNode {
+    constructor (AudioContext context, MediaStreamAudioSourceOptions options);
+    [SameObject] readonly attribute MediaStream mediaStream;
+};
+
+dictionary MediaStreamAudioSourceOptions {
+    required MediaStream mediaStream;
+};
+
+[Exposed=Window]
+interface MediaStreamTrackAudioSourceNode : AudioNode {
+    constructor (AudioContext context, MediaStreamTrackAudioSourceOptions options);
+};
+
+dictionary MediaStreamTrackAudioSourceOptions {
+    required MediaStreamTrack mediaStreamTrack;
+};
+
+enum OscillatorType {
+    "sine",
+    "square",
+    "sawtooth",
+    "triangle",
+    "custom"
+};
+
+[Exposed=Window]
+interface OscillatorNode : AudioScheduledSourceNode {
+    constructor (BaseAudioContext context, optional OscillatorOptions options = {});
+    attribute OscillatorType type;
+    readonly attribute AudioParam frequency;
+    readonly attribute AudioParam detune;
+    undefined setPeriodicWave (PeriodicWave periodicWave);
+};
+
+dictionary OscillatorOptions : AudioNodeOptions {
+    OscillatorType type = "sine";
+    float frequency = 440;
+    float detune = 0;
+    PeriodicWave periodicWave;
+};
+
+enum PanningModelType {
+        "equalpower",
+        "HRTF"
+};
+
+enum DistanceModelType {
+    "linear",
+    "inverse",
+    "exponential"
+};
+
+[Exposed=Window]
+interface PannerNode : AudioNode {
+    constructor (BaseAudioContext context, optional PannerOptions options = {});
+    attribute PanningModelType panningModel;
+    readonly attribute AudioParam positionX;
+    readonly attribute AudioParam positionY;
+    readonly attribute AudioParam positionZ;
+    readonly attribute AudioParam orientationX;
+    readonly attribute AudioParam orientationY;
+    readonly attribute AudioParam orientationZ;
+    attribute DistanceModelType distanceModel;
+    attribute double refDistance;
+    attribute double maxDistance;
+    attribute double rolloffFactor;
+    attribute double coneInnerAngle;
+    attribute double coneOuterAngle;
+    attribute double coneOuterGain;
+    undefined setPosition (float x, float y, float z);
+    undefined setOrientation (float x, float y, float z);
+};
+
+dictionary PannerOptions : AudioNodeOptions {
+    PanningModelType panningModel = "equalpower";
+    DistanceModelType distanceModel = "inverse";
+    float positionX = 0;
+    float positionY = 0;
+    float positionZ = 0;
+    float orientationX = 1;
+    float orientationY = 0;
+    float orientationZ = 0;
+    double refDistance = 1;
+    double maxDistance = 10000;
+    double rolloffFactor = 1;
+    double coneInnerAngle = 360;
+    double coneOuterAngle = 360;
+    double coneOuterGain = 0;
+};
+
+[Exposed=Window]
+interface PeriodicWave {
+    constructor (BaseAudioContext context, optional PeriodicWaveOptions options = {});
+};
+
+dictionary PeriodicWaveConstraints {
+    boolean disableNormalization = false;
+};
+
+dictionary PeriodicWaveOptions : PeriodicWaveConstraints {
+    sequence<float> real;
+    sequence<float> imag;
+};
+
+[Exposed=Window]
+interface ScriptProcessorNode : AudioNode {
+    attribute EventHandler onaudioprocess;
+    readonly attribute long bufferSize;
+};
+
+[Exposed=Window]
+interface StereoPannerNode : AudioNode {
+    constructor (BaseAudioContext context, optional StereoPannerOptions options = {});
+    readonly attribute AudioParam pan;
+};
+
+dictionary StereoPannerOptions : AudioNodeOptions {
+    float pan = 0;
+};
+
+enum OverSampleType {
+    "none",
+    "2x",
+    "4x"
+};
+
+[Exposed=Window]
+interface WaveShaperNode : AudioNode {
+    constructor (BaseAudioContext context, optional WaveShaperOptions options = {});
+    attribute Float32Array? curve;
+    attribute OverSampleType oversample;
+};
+
+dictionary WaveShaperOptions : AudioNodeOptions {
+    sequence<float> curve;
+    OverSampleType oversample = "none";
+};
+
+[Exposed=Window, SecureContext]
+interface AudioWorklet : Worklet {
+  readonly attribute MessagePort port;
+};
+
+callback AudioWorkletProcessorConstructor = AudioWorkletProcessor (object options);
+
+[Global=(Worklet, AudioWorklet), Exposed=AudioWorklet]
+interface AudioWorkletGlobalScope : WorkletGlobalScope {
+    undefined registerProcessor (DOMString name,
+                                               AudioWorkletProcessorConstructor processorCtor);
+    readonly attribute unsigned long long currentFrame;
+    readonly attribute double currentTime;
+    readonly attribute float sampleRate;
+    readonly attribute MessagePort port;
+};
+
+[Exposed=Window]
+interface AudioParamMap {
+    readonly maplike<DOMString, AudioParam>;
+};
+
+[Exposed=Window, SecureContext]
+interface AudioWorkletNode : AudioNode {
+    constructor (BaseAudioContext context, DOMString name,
+               optional AudioWorkletNodeOptions options = {});
+    readonly attribute AudioParamMap parameters;
+    readonly attribute MessagePort port;
+    attribute EventHandler onprocessorerror;
+};
+
+dictionary AudioWorkletNodeOptions : AudioNodeOptions {
+    unsigned long numberOfInputs = 1;
+    unsigned long numberOfOutputs = 1;
+    sequence<unsigned long> outputChannelCount;
+    record<DOMString, double> parameterData;
+    object processorOptions;
+};
+
+[Exposed=AudioWorklet]
+interface AudioWorkletProcessor {
+    constructor ();
+    readonly attribute MessagePort port;
+};
+
+callback AudioWorkletProcessCallback =
+  boolean (FrozenArray<FrozenArray<Float32Array>> inputs,
+           FrozenArray<FrozenArray<Float32Array>> outputs,
+           object parameters);
+
+dictionary AudioParamDescriptor {
+    required DOMString name;
+    float defaultValue = 0;
+    float minValue = -3.4028235e38;
+    float maxValue = 3.4028235e38;
+    AutomationRate automationRate = "a-rate";
+};