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diff --git a/test/wpt/tests/interfaces/webcodecs.idl b/test/wpt/tests/interfaces/webcodecs.idl
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+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebCodecs (https://w3c.github.io/webcodecs/)
+
+[Exposed=(Window,DedicatedWorker), SecureContext]
+interface AudioDecoder : EventTarget {
+  constructor(AudioDecoderInit init);
+
+  readonly attribute CodecState state;
+  readonly attribute unsigned long decodeQueueSize;
+  attribute EventHandler ondequeue;
+
+  undefined configure(AudioDecoderConfig config);
+  undefined decode(EncodedAudioChunk chunk);
+  Promise<undefined> flush();
+  undefined reset();
+  undefined close();
+
+  static Promise<AudioDecoderSupport> isConfigSupported(AudioDecoderConfig config);
+};
+
+dictionary AudioDecoderInit {
+  required AudioDataOutputCallback output;
+  required WebCodecsErrorCallback error;
+};
+
+callback AudioDataOutputCallback = undefined(AudioData output);
+
+[Exposed=(Window,DedicatedWorker), SecureContext]
+interface VideoDecoder : EventTarget {
+  constructor(VideoDecoderInit init);
+
+  readonly attribute CodecState state;
+  readonly attribute unsigned long decodeQueueSize;
+  attribute EventHandler ondequeue;
+
+  undefined configure(VideoDecoderConfig config);
+  undefined decode(EncodedVideoChunk chunk);
+  Promise<undefined> flush();
+  undefined reset();
+  undefined close();
+
+  static Promise<VideoDecoderSupport> isConfigSupported(VideoDecoderConfig config);
+};
+
+dictionary VideoDecoderInit {
+  required VideoFrameOutputCallback output;
+  required WebCodecsErrorCallback error;
+};
+
+callback VideoFrameOutputCallback = undefined(VideoFrame output);
+
+[Exposed=(Window,DedicatedWorker), SecureContext]
+interface AudioEncoder : EventTarget {
+  constructor(AudioEncoderInit init);
+
+  readonly attribute CodecState state;
+  readonly attribute unsigned long encodeQueueSize;
+  attribute EventHandler ondequeue;
+
+  undefined configure(AudioEncoderConfig config);
+  undefined encode(AudioData data);
+  Promise<undefined> flush();
+  undefined reset();
+  undefined close();
+
+  static Promise<AudioEncoderSupport> isConfigSupported(AudioEncoderConfig config);
+};
+
+dictionary AudioEncoderInit {
+  required EncodedAudioChunkOutputCallback output;
+  required WebCodecsErrorCallback error;
+};
+
+callback EncodedAudioChunkOutputCallback =
+    undefined (EncodedAudioChunk output,
+               optional EncodedAudioChunkMetadata metadata = {});
+
+dictionary EncodedAudioChunkMetadata {
+  AudioDecoderConfig decoderConfig;
+};
+
+[Exposed=(Window,DedicatedWorker), SecureContext]
+interface VideoEncoder : EventTarget {
+  constructor(VideoEncoderInit init);
+
+  readonly attribute CodecState state;
+  readonly attribute unsigned long encodeQueueSize;
+  attribute EventHandler ondequeue;
+
+  undefined configure(VideoEncoderConfig config);
+  undefined encode(VideoFrame frame, optional VideoEncoderEncodeOptions options = {});
+  Promise<undefined> flush();
+  undefined reset();
+  undefined close();
+
+  static Promise<VideoEncoderSupport> isConfigSupported(VideoEncoderConfig config);
+};
+
+dictionary VideoEncoderInit {
+  required EncodedVideoChunkOutputCallback output;
+  required WebCodecsErrorCallback error;
+};
+
+callback EncodedVideoChunkOutputCallback =
+    undefined (EncodedVideoChunk chunk,
+               optional EncodedVideoChunkMetadata metadata = {});
+
+dictionary EncodedVideoChunkMetadata {
+  VideoDecoderConfig decoderConfig;
+  SvcOutputMetadata svc;
+  BufferSource alphaSideData;
+};
+
+dictionary SvcOutputMetadata {
+  unsigned long temporalLayerId;
+};
+
+dictionary AudioDecoderSupport {
+  boolean supported;
+  AudioDecoderConfig config;
+};
+
+dictionary VideoDecoderSupport {
+  boolean supported;
+  VideoDecoderConfig config;
+};
+
+dictionary AudioEncoderSupport {
+  boolean supported;
+  AudioEncoderConfig config;
+};
+
+dictionary VideoEncoderSupport {
+  boolean supported;
+  VideoEncoderConfig config;
+};
+
+dictionary AudioDecoderConfig {
+  required DOMString codec;
+  [EnforceRange] required unsigned long sampleRate;
+  [EnforceRange] required unsigned long numberOfChannels;
+  BufferSource description;
+};
+
+dictionary VideoDecoderConfig {
+  required DOMString codec;
+  [AllowShared] BufferSource description;
+  [EnforceRange] unsigned long codedWidth;
+  [EnforceRange] unsigned long codedHeight;
+  [EnforceRange] unsigned long displayAspectWidth;
+  [EnforceRange] unsigned long displayAspectHeight;
+  VideoColorSpaceInit colorSpace;
+  HardwareAcceleration hardwareAcceleration = "no-preference";
+  boolean optimizeForLatency;
+};
+
+dictionary AudioEncoderConfig {
+  required DOMString codec;
+  [EnforceRange] unsigned long sampleRate;
+  [EnforceRange] unsigned long numberOfChannels;
+  [EnforceRange] unsigned long long bitrate;
+  BitrateMode bitrateMode;
+};
+
+dictionary VideoEncoderConfig {
+  required DOMString codec;
+  [EnforceRange] required unsigned long width;
+  [EnforceRange] required unsigned long height;
+  [EnforceRange] unsigned long displayWidth;
+  [EnforceRange] unsigned long displayHeight;
+  [EnforceRange] unsigned long long bitrate;
+  double framerate;
+  HardwareAcceleration hardwareAcceleration = "no-preference";
+  AlphaOption alpha = "discard";
+  DOMString scalabilityMode;
+  VideoEncoderBitrateMode bitrateMode = "variable";
+  LatencyMode latencyMode = "quality";
+};
+
+enum HardwareAcceleration {
+  "no-preference",
+  "prefer-hardware",
+  "prefer-software",
+};
+
+enum AlphaOption {
+  "keep",
+  "discard",
+};
+
+enum LatencyMode {
+  "quality",
+  "realtime"
+};
+
+dictionary VideoEncoderEncodeOptions {
+  boolean keyFrame = false;
+};
+
+enum VideoEncoderBitrateMode {
+  "constant",
+  "variable",
+  "quantizer"
+};
+
+enum CodecState {
+  "unconfigured",
+  "configured",
+  "closed"
+};
+
+callback WebCodecsErrorCallback = undefined(DOMException error);
+
+[Exposed=(Window,DedicatedWorker), Serializable]
+interface EncodedAudioChunk {
+  constructor(EncodedAudioChunkInit init);
+  readonly attribute EncodedAudioChunkType type;
+  readonly attribute long long timestamp;          // microseconds
+  readonly attribute unsigned long long? duration; // microseconds
+  readonly attribute unsigned long byteLength;
+
+  undefined copyTo([AllowShared] BufferSource destination);
+};
+
+dictionary EncodedAudioChunkInit {
+  required EncodedAudioChunkType type;
+  [EnforceRange] required long long timestamp;    // microseconds
+  [EnforceRange] unsigned long long duration;     // microseconds
+  required BufferSource data;
+};
+
+enum EncodedAudioChunkType {
+    "key",
+    "delta",
+};
+
+[Exposed=(Window,DedicatedWorker), Serializable]
+interface EncodedVideoChunk {
+  constructor(EncodedVideoChunkInit init);
+  readonly attribute EncodedVideoChunkType type;
+  readonly attribute long long timestamp;             // microseconds
+  readonly attribute unsigned long long? duration;    // microseconds
+  readonly attribute unsigned long byteLength;
+
+  undefined copyTo([AllowShared] BufferSource destination);
+};
+
+dictionary EncodedVideoChunkInit {
+  required EncodedVideoChunkType type;
+  [EnforceRange] required long long timestamp;        // microseconds
+  [EnforceRange] unsigned long long duration;         // microseconds
+  required [AllowShared] BufferSource data;
+};
+
+enum EncodedVideoChunkType {
+    "key",
+    "delta",
+};
+
+[Exposed=(Window,DedicatedWorker), Serializable, Transferable]
+interface AudioData {
+  constructor(AudioDataInit init);
+
+  readonly attribute AudioSampleFormat? format;
+  readonly attribute float sampleRate;
+  readonly attribute unsigned long numberOfFrames;
+  readonly attribute unsigned long numberOfChannels;
+  readonly attribute unsigned long long duration;  // microseconds
+  readonly attribute long long timestamp;          // microseconds
+
+  unsigned long allocationSize(AudioDataCopyToOptions options);
+  undefined copyTo([AllowShared] BufferSource destination, AudioDataCopyToOptions options);
+  AudioData clone();
+  undefined close();
+};
+
+dictionary AudioDataInit {
+  required AudioSampleFormat format;
+  required float sampleRate;
+  [EnforceRange] required unsigned long numberOfFrames;
+  [EnforceRange] required unsigned long numberOfChannels;
+  [EnforceRange] required long long timestamp;  // microseconds
+  required BufferSource data;
+};
+
+dictionary AudioDataCopyToOptions {
+  [EnforceRange] required unsigned long planeIndex;
+  [EnforceRange] unsigned long frameOffset = 0;
+  [EnforceRange] unsigned long frameCount;
+  AudioSampleFormat format;
+};
+
+enum AudioSampleFormat {
+  "u8",
+  "s16",
+  "s32",
+  "f32",
+  "u8-planar",
+  "s16-planar",
+  "s32-planar",
+  "f32-planar",
+};
+
+[Exposed=(Window,DedicatedWorker), Serializable, Transferable]
+interface VideoFrame {
+  constructor(CanvasImageSource image, optional VideoFrameInit init = {});
+  constructor([AllowShared] BufferSource data, VideoFrameBufferInit init);
+
+  readonly attribute VideoPixelFormat? format;
+  readonly attribute unsigned long codedWidth;
+  readonly attribute unsigned long codedHeight;
+  readonly attribute DOMRectReadOnly? codedRect;
+  readonly attribute DOMRectReadOnly? visibleRect;
+  readonly attribute unsigned long displayWidth;
+  readonly attribute unsigned long displayHeight;
+  readonly attribute unsigned long long? duration;  // microseconds
+  readonly attribute long long timestamp;           // microseconds
+  readonly attribute VideoColorSpace colorSpace;
+
+  VideoFrameMetadata metadata();
+
+  unsigned long allocationSize(
+      optional VideoFrameCopyToOptions options = {});
+  Promise<sequence<PlaneLayout>> copyTo(
+      [AllowShared] BufferSource destination,
+      optional VideoFrameCopyToOptions options = {});
+  VideoFrame clone();
+  undefined close();
+};
+
+dictionary VideoFrameInit {
+  unsigned long long duration;  // microseconds
+  long long timestamp;          // microseconds
+  AlphaOption alpha = "keep";
+
+  // Default matches image. May be used to efficiently crop. Will trigger
+  // new computation of displayWidth and displayHeight using image’s pixel
+  // aspect ratio unless an explicit displayWidth and displayHeight are given.
+  DOMRectInit visibleRect;
+
+  // Default matches image unless visibleRect is provided.
+  [EnforceRange] unsigned long displayWidth;
+  [EnforceRange] unsigned long displayHeight;
+
+  VideoFrameMetadata metadata;
+};
+
+dictionary VideoFrameBufferInit {
+  required VideoPixelFormat format;
+  required [EnforceRange] unsigned long codedWidth;
+  required [EnforceRange] unsigned long codedHeight;
+  required [EnforceRange] long long timestamp;  // microseconds
+  [EnforceRange] unsigned long long duration;  // microseconds
+
+  // Default layout is tightly-packed.
+  sequence<PlaneLayout> layout;
+
+  // Default visible rect is coded size positioned at (0,0)
+  DOMRectInit visibleRect;
+
+  // Default display dimensions match visibleRect.
+  [EnforceRange] unsigned long displayWidth;
+  [EnforceRange] unsigned long displayHeight;
+
+  VideoColorSpaceInit colorSpace;
+};
+
+dictionary VideoFrameMetadata {
+  // Possible members are recorded in the VideoFrame Metadata Registry.
+};
+
+dictionary VideoFrameCopyToOptions {
+  DOMRectInit rect;
+  sequence<PlaneLayout> layout;
+};
+
+dictionary PlaneLayout {
+  [EnforceRange] required unsigned long offset;
+  [EnforceRange] required unsigned long stride;
+};
+
+enum VideoPixelFormat {
+  // 4:2:0 Y, U, V
+  "I420",
+  // 4:2:0 Y, U, V, A
+  "I420A",
+  // 4:2:2 Y, U, V
+  "I422",
+  // 4:4:4 Y, U, V
+  "I444",
+  // 4:2:0 Y, UV
+  "NV12",
+  // 32bpp RGBA
+  "RGBA",
+  // 32bpp RGBX (opaque)
+  "RGBX",
+  // 32bpp BGRA
+  "BGRA",
+  // 32bpp BGRX (opaque)
+  "BGRX",
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface VideoColorSpace {
+  constructor(optional VideoColorSpaceInit init = {});
+
+  readonly attribute VideoColorPrimaries? primaries;
+  readonly attribute VideoTransferCharacteristics? transfer;
+  readonly attribute VideoMatrixCoefficients? matrix;
+  readonly attribute boolean? fullRange;
+
+  [Default] VideoColorSpaceInit toJSON();
+};
+
+dictionary VideoColorSpaceInit {
+  VideoColorPrimaries? primaries = null;
+  VideoTransferCharacteristics? transfer = null;
+  VideoMatrixCoefficients? matrix = null;
+  boolean? fullRange = null;
+};
+
+enum VideoColorPrimaries {
+  "bt709",
+  "bt470bg",
+  "smpte170m",
+  "bt2020",
+  "smpte432",
+};
+
+enum VideoTransferCharacteristics {
+  "bt709",
+  "smpte170m",
+  "iec61966-2-1",
+  "linear",
+  "pq",
+  "hlg",
+};
+
+enum VideoMatrixCoefficients {
+  "rgb",
+  "bt709",
+  "bt470bg",
+  "smpte170m",
+  "bt2020-ncl",
+};
+
+[Exposed=(Window,DedicatedWorker), SecureContext]
+interface ImageDecoder {
+  constructor(ImageDecoderInit init);
+
+  readonly attribute DOMString type;
+  readonly attribute boolean complete;
+  readonly attribute Promise<undefined> completed;
+  readonly attribute ImageTrackList tracks;
+
+  Promise<ImageDecodeResult> decode(optional ImageDecodeOptions options = {});
+  undefined reset();
+  undefined close();
+
+  static Promise<boolean> isTypeSupported(DOMString type);
+};
+
+typedef (BufferSource or ReadableStream) ImageBufferSource;
+dictionary ImageDecoderInit {
+  required DOMString type;
+  required ImageBufferSource data;
+  ColorSpaceConversion colorSpaceConversion = "default";
+  [EnforceRange] unsigned long desiredWidth;
+  [EnforceRange] unsigned long desiredHeight;
+  boolean preferAnimation;
+};
+
+dictionary ImageDecodeOptions {
+  [EnforceRange] unsigned long frameIndex = 0;
+  boolean completeFramesOnly = true;
+};
+
+dictionary ImageDecodeResult {
+  required VideoFrame image;
+  required boolean complete;
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface ImageTrackList {
+  getter ImageTrack (unsigned long index);
+
+  readonly attribute Promise<undefined> ready;
+  readonly attribute unsigned long length;
+  readonly attribute long selectedIndex;
+  readonly attribute ImageTrack? selectedTrack;
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface ImageTrack {
+  readonly attribute boolean animated;
+  readonly attribute unsigned long frameCount;
+  readonly attribute unrestricted float repetitionCount;
+  attribute boolean selected;
+};