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diff --git a/testing/web-platform/tests/interfaces/mediacapture-streams.idl b/testing/web-platform/tests/interfaces/mediacapture-streams.idl
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+++ b/testing/web-platform/tests/interfaces/mediacapture-streams.idl
@@ -0,0 +1,244 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Media Capture and Streams (https://w3c.github.io/mediacapture-main/)
+
+[Exposed=Window]
+interface MediaStream : EventTarget {
+  constructor();
+  constructor(MediaStream stream);
+  constructor(sequence<MediaStreamTrack> tracks);
+  readonly attribute DOMString id;
+  sequence<MediaStreamTrack> getAudioTracks();
+  sequence<MediaStreamTrack> getVideoTracks();
+  sequence<MediaStreamTrack> getTracks();
+  MediaStreamTrack? getTrackById(DOMString trackId);
+  undefined addTrack(MediaStreamTrack track);
+  undefined removeTrack(MediaStreamTrack track);
+  MediaStream clone();
+  readonly attribute boolean active;
+  attribute EventHandler onaddtrack;
+  attribute EventHandler onremovetrack;
+};
+
+[Exposed=Window]
+interface MediaStreamTrack : EventTarget {
+  readonly attribute DOMString kind;
+  readonly attribute DOMString id;
+  readonly attribute DOMString label;
+  attribute boolean enabled;
+  readonly attribute boolean muted;
+  attribute EventHandler onmute;
+  attribute EventHandler onunmute;
+  readonly attribute MediaStreamTrackState readyState;
+  attribute EventHandler onended;
+  MediaStreamTrack clone();
+  undefined stop();
+  MediaTrackCapabilities getCapabilities();
+  MediaTrackConstraints getConstraints();
+  MediaTrackSettings getSettings();
+  Promise<undefined> applyConstraints(optional MediaTrackConstraints constraints = {});
+};
+
+enum MediaStreamTrackState {
+  "live",
+  "ended"
+};
+
+dictionary MediaTrackSupportedConstraints {
+  boolean width = true;
+  boolean height = true;
+  boolean aspectRatio = true;
+  boolean frameRate = true;
+  boolean facingMode = true;
+  boolean resizeMode = true;
+  boolean sampleRate = true;
+  boolean sampleSize = true;
+  boolean echoCancellation = true;
+  boolean autoGainControl = true;
+  boolean noiseSuppression = true;
+  boolean latency = true;
+  boolean channelCount = true;
+  boolean deviceId = true;
+  boolean groupId = true;
+};
+
+dictionary MediaTrackCapabilities {
+  ULongRange width;
+  ULongRange height;
+  DoubleRange aspectRatio;
+  DoubleRange frameRate;
+  sequence<DOMString> facingMode;
+  sequence<DOMString> resizeMode;
+  ULongRange sampleRate;
+  ULongRange sampleSize;
+  sequence<boolean> echoCancellation;
+  sequence<boolean> autoGainControl;
+  sequence<boolean> noiseSuppression;
+  DoubleRange latency;
+  ULongRange channelCount;
+  DOMString deviceId;
+  DOMString groupId;
+};
+
+dictionary MediaTrackConstraints : MediaTrackConstraintSet {
+  sequence<MediaTrackConstraintSet> advanced;
+};
+
+dictionary MediaTrackConstraintSet {
+  ConstrainULong width;
+  ConstrainULong height;
+  ConstrainDouble aspectRatio;
+  ConstrainDouble frameRate;
+  ConstrainDOMString facingMode;
+  ConstrainDOMString resizeMode;
+  ConstrainULong sampleRate;
+  ConstrainULong sampleSize;
+  ConstrainBoolean echoCancellation;
+  ConstrainBoolean autoGainControl;
+  ConstrainBoolean noiseSuppression;
+  ConstrainDouble latency;
+  ConstrainULong channelCount;
+  ConstrainDOMString deviceId;
+  ConstrainDOMString groupId;
+};
+
+dictionary MediaTrackSettings {
+  unsigned long width;
+  unsigned long height;
+  double aspectRatio;
+  double frameRate;
+  DOMString facingMode;
+  DOMString resizeMode;
+  unsigned long sampleRate;
+  unsigned long sampleSize;
+  boolean echoCancellation;
+  boolean autoGainControl;
+  boolean noiseSuppression;
+  double latency;
+  unsigned long channelCount;
+  DOMString deviceId;
+  DOMString groupId;
+};
+
+enum VideoFacingModeEnum {
+  "user",
+  "environment",
+  "left",
+  "right"
+};
+
+enum VideoResizeModeEnum {
+  "none",
+  "crop-and-scale"
+};
+
+[Exposed=Window]
+interface MediaStreamTrackEvent : Event {
+  constructor(DOMString type, MediaStreamTrackEventInit eventInitDict);
+  [SameObject] readonly attribute MediaStreamTrack track;
+};
+
+dictionary MediaStreamTrackEventInit : EventInit {
+  required MediaStreamTrack track;
+};
+
+[Exposed=Window]
+interface OverconstrainedError : DOMException {
+  constructor(DOMString constraint, optional DOMString message = "");
+  readonly attribute DOMString constraint;
+};
+
+partial interface Navigator {
+  [SameObject, SecureContext] readonly attribute MediaDevices mediaDevices;
+};
+
+[Exposed=Window, SecureContext]
+interface MediaDevices : EventTarget {
+  attribute EventHandler ondevicechange;
+  Promise<sequence<MediaDeviceInfo>> enumerateDevices();
+};
+
+[Exposed=Window, SecureContext]
+interface MediaDeviceInfo {
+  readonly attribute DOMString deviceId;
+  readonly attribute MediaDeviceKind kind;
+  readonly attribute DOMString label;
+  readonly attribute DOMString groupId;
+  [Default] object toJSON();
+};
+
+enum MediaDeviceKind {
+  "audioinput",
+  "audiooutput",
+  "videoinput"
+};
+
+[Exposed=Window, SecureContext]
+interface InputDeviceInfo : MediaDeviceInfo {
+  MediaTrackCapabilities getCapabilities();
+};
+
+partial interface MediaDevices {
+  MediaTrackSupportedConstraints getSupportedConstraints();
+  Promise<MediaStream> getUserMedia(optional MediaStreamConstraints constraints = {});
+};
+
+dictionary MediaStreamConstraints {
+  (boolean or MediaTrackConstraints) video = false;
+  (boolean or MediaTrackConstraints) audio = false;
+};
+
+partial interface Navigator {
+  [SecureContext] undefined getUserMedia(MediaStreamConstraints constraints,
+                                    NavigatorUserMediaSuccessCallback successCallback,
+                                    NavigatorUserMediaErrorCallback errorCallback);
+};
+
+callback NavigatorUserMediaSuccessCallback = undefined (MediaStream stream);
+
+callback NavigatorUserMediaErrorCallback = undefined (DOMException error);
+
+dictionary DoubleRange {
+  double max;
+  double min;
+};
+
+dictionary ConstrainDoubleRange : DoubleRange {
+  double exact;
+  double ideal;
+};
+
+dictionary ULongRange {
+  [Clamp] unsigned long max;
+  [Clamp] unsigned long min;
+};
+
+dictionary ConstrainULongRange : ULongRange {
+  [Clamp] unsigned long exact;
+  [Clamp] unsigned long ideal;
+};
+
+dictionary ConstrainBooleanParameters {
+  boolean exact;
+  boolean ideal;
+};
+
+dictionary ConstrainDOMStringParameters {
+  (DOMString or sequence<DOMString>) exact;
+  (DOMString or sequence<DOMString>) ideal;
+};
+
+typedef ([Clamp] unsigned long or ConstrainULongRange) ConstrainULong;
+
+typedef (double or ConstrainDoubleRange) ConstrainDouble;
+
+typedef (boolean or ConstrainBooleanParameters) ConstrainBoolean;
+
+typedef (DOMString or
+sequence<DOMString> or
+ConstrainDOMStringParameters) ConstrainDOMString;
+
+dictionary CameraDevicePermissionDescriptor : PermissionDescriptor {
+  boolean panTiltZoom = false;
+};