Constructor extended attributes

Constructors

BackgroundSync.idl:[Constructor(DOMString type, SyncEventInit init), Exposed=ServiceWorker]
CSP.idl:[Constructor(DOMString type, optional SecurityPolicyViolationEventInit eventInitDict),
CSS-Parser-API.idl:[Constructor(DOMString name, sequence<CSSToken> prelude, optional sequence<CSSParserRule>? body)]
CSS-Parser-API.idl:[Constructor(sequence<CSSToken> prelude, optional sequence<CSSParserRule>? body)]
CSS-Parser-API.idl:[Constructor(DOMString name, optional sequence<CSSParserRule> body)]
CSS-Parser-API.idl:[Constructor(DOMString name, sequence<CSSParserValue> body)]
CSS-Parser-API.idl:[Constructor(DOMString name, sequence<sequence<CSSParserValue>> args)]
DOM-Parsing.idl:[Constructor, Exposed=Window]
DOM-Parsing.idl:[Constructor, Exposed=Window]
FileAPI.idl:[Constructor(optional sequence<BlobPart> blobParts,
FileAPI.idl:[Constructor(sequence<BlobPart> fileBits,
FileAPI.idl:[Constructor, Exposed=(Window,Worker)]
FileAPI.idl:[Constructor, Exposed=(DedicatedWorker,SharedWorker)]
IndexedDB.idl: Constructor(DOMString type, optional IDBVersionChangeEventInit eventInitDict)]
InputDeviceCapabilities.idl:[Constructor(optional InputDeviceCapabilitiesInit deviceInitDict)]
SVG.idl:[Constructor(Animation source, Animatable newTarget), Exposed=Window]
WebIDL.idl: Constructor(optional DOMString message = "", optional DOMString name = "Error")
accelerometer.idl:[Constructor(optional AccelerometerSensorOptions options), SecureContext,
accelerometer.idl:[Constructor(optional AccelerometerSensorOptions options), SecureContext,
accelerometer.idl:[Constructor(optional AccelerometerSensorOptions options), SecureContext,
ambient-light.idl:[Constructor(optional SensorOptions sensorOptions), SecureContext, Exposed=Window]
animation-worklet.idl:[Constructor (DOMString animatorName,
appmanifest.idl:[Constructor(DOMString type, optional EventInit eventInitDict),
background-fetch.idl:[Constructor(DOMString type, BackgroundFetchEventInit init), Exposed=ServiceWorker]
background-fetch.idl:[Constructor(DOMString type, BackgroundFetchEventInit init), Exposed=ServiceWorker]
clipboard-apis.idl:[Constructor(DOMString type, optional ClipboardEventInit eventInitDict), Exposed=Window]
clipboard-apis.idl:[Constructor(record<DOMString, ClipboardItemData> items,
cookie-store.idl: Constructor(DOMString type, optional CookieChangeEventInit eventInitDict)]
cookie-store.idl: Constructor(DOMString type, optional ExtendableCookieChangeEventInit eventInitDict)
credential-management.idl:[Constructor(HTMLFormElement form),
credential-management.idl: Constructor(PasswordCredentialData data),
credential-management.idl:[Constructor(FederatedCredentialInit data),
css-animations.idl: Constructor(CSSOMString type, optional AnimationEventInit animationEventInitDict)]
css-font-loading.idl:[Constructor(CSSOMString family, (CSSOMString or BinaryData) source,
css-font-loading.idl:[Constructor(CSSOMString type, optional FontFaceSetLoadEventInit eventInitDict),
css-font-loading.idl: Constructor(sequence<FontFace> initialFaces)]
css-layout-api.idl:[Constructor(optional FragmentResultOptions options)]
css-transitions.idl: Constructor(CSSOMString type, optional TransitionEventInit transitionEventInitDict)]
css-typed-om.idl: Constructor(sequence<CSSUnparsedSegment> members)]
css-typed-om.idl: Constructor(USVString variable, optional CSSUnparsedValue? fallback = null)]
css-typed-om.idl: Constructor(USVString value)]
css-typed-om.idl: Constructor(double value, USVString unit)]
css-typed-om.idl: Constructor(CSSNumberish... args)]
css-typed-om.idl: Constructor(CSSNumberish... args)]
css-typed-om.idl: Constructor(CSSNumberish arg)]
css-typed-om.idl: Constructor(CSSNumberish arg)]
css-typed-om.idl: Constructor(CSSNumberish... args)]
css-typed-om.idl: Constructor(CSSNumberish... args)]
css-typed-om.idl: Constructor(CSSNumberish min, CSSNumberish val, CSSNumberish max)]
css-typed-om.idl: Constructor(sequence<CSSTransformComponent> transforms)]
css-typed-om.idl: Constructor(CSSNumericValue x, CSSNumericValue y, optional CSSNumericValue z)]
css-typed-om.idl: Constructor(CSSNumericValue angle),
css-typed-om.idl: Constructor(CSSNumberish x, CSSNumberish y, CSSNumberish z, CSSNumericValue angle)]
css-typed-om.idl: Constructor(CSSNumberish x, CSSNumberish y, optional CSSNumberish z)]
css-typed-om.idl: Constructor(CSSNumericValue ax, CSSNumericValue ay)]
css-typed-om.idl: Constructor(CSSNumericValue ax)]
css-typed-om.idl: Constructor(CSSNumericValue ay)]
css-typed-om.idl: Constructor(CSSNumericValue length)]
css-typed-om.idl: Constructor(DOMMatrixReadOnly matrix, optional CSSMatrixComponentOptions options)]
cssom-view.idl: Constructor(CSSOMString type, optional MediaQueryListEventInit eventInitDict)]
dedicated-workers.idl:[Constructor(), Exposed=(Window,Worker)]
dom.idl:[Constructor(DOMString type, optional EventInit eventInitDict),
dom.idl:[Constructor(DOMString type, optional CustomEventInit eventInitDict),
dom.idl:[Constructor,
dom.idl:[Constructor,
dom.idl:[Constructor(MutationCallback callback),
dom.idl:[Constructor,
dom.idl:[Constructor,
dom.idl:[Constructor(optional DOMString data = ""),
dom.idl:[Constructor(optional DOMString data = ""),
dom.idl:[Constructor,
encoding.idl:[Constructor(optional DOMString label = "utf-8", optional TextDecoderOptions options),
encoding.idl:[Constructor,
encoding.idl:[Constructor(optional DOMString label = "utf-8", optional TextDecoderOptions options),
encoding.idl:[Constructor,
encrypted-media.idl: Constructor(DOMString type, MediaKeyMessageEventInit eventInitDict)]
encrypted-media.idl: Constructor(DOMString type, optional MediaEncryptedEventInit eventInitDict)]
fetch.idl:[Constructor(optional HeadersInit init),
fetch.idl:[Constructor(RequestInfo input, optional RequestInit init),
fetch.idl:[Constructor(optional BodyInit? body = null, optional ResponseInit init), Exposed=(Window,Worker)]
gamepad.idl:[Constructor(DOMString type, GamepadEventInit eventInitDict), Exposed=Window]
generic-sensor.idl:[Constructor(DOMString type, SensorErrorEventInit errorEventInitDict),
geolocation-sensor.idl:[Constructor(optional GeolocationSensorOptions options),
geometry.idl:[Constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
geometry.idl:[Constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
geometry.idl:[Constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
geometry.idl:[Constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
geometry.idl:[Constructor(optional DOMPointInit p1, optional DOMPointInit p2,
geometry.idl:[Constructor(optional (DOMString or sequence<unrestricted double>) init),
geometry.idl:[Constructor(optional (DOMString or sequence<unrestricted double>) init),
gyroscope.idl:[Constructor(optional GyroscopeSensorOptions sensorOptions), SecureContext, Exposed=Window]
html.idl: NamedConstructor=Image(optional unsigned long width, optional unsigned long height)]
html.idl: NamedConstructor=Audio(optional DOMString src)]
html.idl: Constructor(DOMString type, optional TrackEventInit eventInitDict)]
html.idl: NamedConstructor=Option(optional DOMString text = "", optional DOMString value, optional boolean defaultSelected = false, optional boolean selected = false)]
html.idl: Constructor(DOMString type, optional FormDataEventInit eventInitDict)]
html.idl:[Constructor(unsigned long sw, unsigned long sh),
html.idl: Constructor(Uint8ClampedArray data, unsigned long sw, optional unsigned long sh),
html.idl:[Constructor(optional (Path2D or DOMString) path),
html.idl:[Constructor([EnforceRange] unsigned long long width, [EnforceRange] unsigned long long height), Exposed=(Window,Worker), Transferable]
html.idl: [CEReactions] void define(DOMString name, CustomElementConstructor constructor, optional ElementDefinitionOptions options);
html.idl:callback CustomElementConstructor = any ();
html.idl: Constructor]
html.idl: Constructor(DOMString type, optional DragEventInit eventInitDict)]
html.idl: Constructor(DOMString type, optional PopStateEventInit eventInitDict)]
html.idl: Constructor(DOMString type, optional HashChangeEventInit eventInitDict)]
html.idl: Constructor(DOMString type, optional PageTransitionEventInit eventInitDict)]
html.idl:[Constructor(DOMString type, optional ErrorEventInit eventInitDict), Exposed=(Window,Worker)]
html.idl:[Constructor(DOMString type, PromiseRejectionEventInit eventInitDict), Exposed=(Window,Worker)]
html.idl:[Constructor(DOMString type, optional MessageEventInit eventInitDict), Exposed=(Window,Worker,AudioWorklet)]
html.idl:[Constructor(USVString url, optional EventSourceInit eventSourceInitDict), Exposed=(Window,Worker)]
html.idl:[Constructor(USVString url, optional (DOMString or sequence<DOMString>) protocols = []), Exposed=(Window,Worker)]
html.idl:[Constructor(DOMString type, optional CloseEventInit eventInitDict), Exposed=(Window,Worker)]
html.idl:[Constructor, Exposed=(Window,Worker)]
html.idl:[Constructor(DOMString name), Exposed=(Window,Worker)]
html.idl:[Constructor(USVString scriptURL, optional WorkerOptions options), Exposed=(Window,Worker)]
html.idl:[Constructor(USVString scriptURL, optional (DOMString or WorkerOptions) options),
html.idl: Constructor(DOMString type, optional StorageEventInit eventInitDict)]
image-capture.idl:[Exposed=Window, Constructor(MediaStreamTrack videoTrack)]
intersection-observer.idl:[Constructor(IntersectionObserverCallback callback, optional IntersectionObserverInit options),
intersection-observer.idl:[Constructor(IntersectionObserverEntryInit intersectionObserverEntryInit)]
magnetometer.idl:[Constructor(optional MagnetometerSensorOptions sensorOptions), SecureContext,
magnetometer.idl:[Constructor(optional MagnetometerSensorOptions sensorOptions), SecureContext,
media-source.idl:[Constructor]
mediacapture-streams.idl: Constructor,
mediacapture-streams.idl: Constructor(MediaStream stream),
mediacapture-streams.idl: Constructor(sequence<MediaStreamTrack> tracks)]
mediacapture-streams.idl: Constructor(DOMString type, MediaStreamTrackEventInit eventInitDict)]
mediacapture-streams.idl: Constructor(DOMString type, OverconstrainedErrorEventInit eventInitDict)]
mediasession.idl:[Constructor(optional MediaMetadataInit init), Exposed=Window]
mediastream-recording.idl: Constructor(MediaStream stream, optional MediaRecorderOptions options)]
mediastream-recording.idl:[Exposed=Window, Constructor(DOMString type, BlobEventInit eventInitDict)]
mediastream-recording.idl:[Exposed=Window, Constructor(DOMString type, MediaRecorderErrorEventInit eventInitDict)]
notifications.idl:[Constructor(DOMString title, optional NotificationOptions options),
notifications.idl:[Constructor(DOMString type, NotificationEventInit eventInitDict),
orientation-event.idl: [Constructor(DOMString type, optional DeviceOrientationEventInit eventInitDict), Exposed=Window]
orientation-event.idl: [Constructor(DOMString type, optional DeviceMotionEventInit eventInitDict), Exposed=Window]
orientation-sensor.idl:[Constructor(optional OrientationSensorOptions sensorOptions), SecureContext, Exposed=Window]
orientation-sensor.idl:[Constructor(optional OrientationSensorOptions sensorOptions), SecureContext, Exposed=Window]
payment-handler.idl:[Constructor(DOMString type, CanMakePaymentEventInit eventInitDict), Exposed=ServiceWorker]
payment-handler.idl:[Constructor(DOMString type, PaymentRequestEventInit eventInitDict), Exposed=ServiceWorker]
payment-request.idl:[Constructor(sequence<PaymentMethodData> methodData, PaymentDetailsInit details, optional PaymentOptions options),
payment-request.idl:[Constructor(DOMString type, optional MerchantValidationEventInit eventInitDict),
payment-request.idl:[Constructor(DOMString type, optional PaymentMethodChangeEventInit eventInitDict), SecureContext, Exposed=Window]
payment-request.idl:[Constructor(DOMString type, optional PaymentRequestUpdateEventInit eventInitDict), SecureContext, Exposed=Window]
performance-timeline.idl:[Constructor(PerformanceObserverCallback callback), Exposed=(Window,Worker)]
picture-in-picture.idl: Constructor(DOMString type, EnterPictureInPictureEventInit eventInitDict),
pointerevents.idl:[Constructor(DOMString type, optional PointerEventInit eventInitDict), Exposed=Window]
presentation-api.idl:[Constructor(USVString url),
presentation-api.idl: Constructor(sequence<USVString> urls),
presentation-api.idl:[Constructor(DOMString type, PresentationConnectionAvailableEventInit eventInitDict),
presentation-api.idl:[Constructor(DOMString type, PresentationConnectionCloseEventInit eventInitDict),
proximity.idl:[Constructor(optional SensorOptions sensorOptions), SecureContext, Exposed=Window]
push-api.idl:[Constructor(DOMString type, optional PushEventInit eventInitDict), Exposed=ServiceWorker, SecureContext]
push-api.idl:[Constructor(DOMString type, optional PushSubscriptionChangeInit eventInitDict), Exposed=ServiceWorker, SecureContext]
reporting.idl:[Constructor(ReportingObserverCallback callback, optional ReportingObserverOptions options)]
resize-observer.idl: Constructor(ResizeObserverCallback callback)]
resize-observer.idl:[Exposed=Window, Constructor(Element target)]
resize-observer.idl:[Constructor(Element target)
scroll-animations.idl: Constructor(optional ScrollTimelineOptions options)]
service-workers.idl:[Constructor(DOMString type, optional ExtendableEventInit eventInitDict), Exposed=ServiceWorker]
service-workers.idl:[Constructor(DOMString type, FetchEventInit eventInitDict), Exposed=ServiceWorker]
service-workers.idl:[Constructor(DOMString type, optional ExtendableMessageEventInit eventInitDict), Exposed=ServiceWorker]
shape-detection-api.idl: Constructor(optional FaceDetectorOptions faceDetectorOptions)]
shape-detection-api.idl: Constructor(optional BarcodeDetectorOptions barcodeDetectorOptions)]
speech-api.idl:[Exposed=Window, Constructor]
speech-api.idl: Constructor(DOMString type, SpeechRecognitionErrorEventInit eventInitDict)]
speech-api.idl: Constructor(DOMString type, SpeechRecognitionEventInit eventInitDict)]
speech-api.idl:[Exposed=Window, Constructor]
speech-api.idl:[Exposed=Window, Constructor]
speech-api.idl: Constructor(optional DOMString text)]
speech-api.idl: Constructor(DOMString type, SpeechSynthesisEventInit eventInitDict)]
speech-api.idl: Constructor(DOMString type, SpeechSynthesisErrorEventInit eventInitDict)]
touch-events.idl:[Constructor(TouchInit touchInitDict), Exposed=Window]
touch-events.idl:[Constructor(DOMString type, optional TouchEventInit eventInitDict), Exposed=Window]
uievents.idl:[Constructor(DOMString type, optional UIEventInit eventInitDict), Exposed=Window]
uievents.idl:[Constructor(DOMString type, optional FocusEventInit eventInitDict), Exposed=Window]
uievents.idl:[Constructor(DOMString type, optional MouseEventInit eventInitDict), Exposed=Window]
uievents.idl:[Constructor(DOMString type, optional WheelEventInit eventInitDict), Exposed=Window]
uievents.idl:[Constructor(DOMString type, optional InputEventInit eventInitDict), Exposed=Window]
uievents.idl:[Constructor(DOMString type, optional KeyboardEventInit eventInitDict), Exposed=Window]
uievents.idl:[Constructor(DOMString type, optional CompositionEventInit eventInitDict), Exposed=Window]
url.idl:[Constructor(USVString url, optional USVString base),
url.idl:[Constructor(optional (sequence<sequence<USVString>> or record<USVString, USVString> or USVString) init = ""),
user-timing.idl: Constructor(DOMString markName, optional PerformanceMarkOptions markOptions)]
wake-lock.idl:[Constructor(WakeLockType type), SecureContext, Exposed=(DedicatedWorker,Window)]
wasm-js-api.idl:[LegacyNamespace=WebAssembly, Constructor(BufferSource bytes), Exposed=(Window,Worker,Worklet)]
wasm-js-api.idl:[LegacyNamespace=WebAssembly, Constructor(Module module, optional object importObject), Exposed=(Window,Worker,Worklet)]
wasm-js-api.idl:[LegacyNamespace=WebAssembly, Constructor(MemoryDescriptor descriptor), Exposed=(Window,Worker,Worklet)]
wasm-js-api.idl:[LegacyNamespace=WebAssembly, Constructor(TableDescriptor descriptor), Exposed=(Window,Worker,Worklet)]
wasm-js-api.idl:[LegacyNamespace=WebAssembly, Constructor(GlobalDescriptor descriptor, optional any v), Exposed=(Window,Worker,Worklet)]
web-animations.idl: Constructor (optional DocumentTimelineOptions options)]
web-animations.idl: Constructor (optional AnimationEffect? effect = null,
web-animations.idl: Constructor ((Element or CSSPseudoElement)? target,
web-animations.idl: Constructor (KeyframeEffect source)]
web-animations.idl: Constructor (DOMString type, optional AnimationPlaybackEventInit eventInitDict)]
web-bluetooth.idl: Constructor(DOMString type, optional ValueEventInit initDict),
web-bluetooth.idl: Constructor(DOMString type, BluetoothAdvertisingEventInit init),
web-nfc.idl:[Constructor(), SecureContext, Exposed=Window]
web-nfc.idl:[Constructor(optional NFCReaderOptions options), SecureContext, Exposed=Window]
web-nfc.idl:[Constructor(DOMString type, NFCReadingEventInit readingEventInitDict), SecureContext, Exposed=Window]
web-nfc.idl:[Constructor(DOMString type, NFCErrorEventInit errorEventInitDict), SecureContext, Exposed=Window]
webaudio.idl: Constructor (optional AudioContextOptions contextOptions)]
webaudio.idl: Constructor (OfflineAudioContextOptions contextOptions),
webaudio.idl: Constructor (unsigned long numberOfChannels, unsigned long length, float sampleRate)]
webaudio.idl: Constructor (DOMString type, OfflineAudioCompletionEventInit eventInitDict)]
webaudio.idl: Constructor (AudioBufferOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional AnalyserOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional AudioBufferSourceOptions options)]
webaudio.idl: Constructor (DOMString type, AudioProcessingEventInit eventInitDict)]
webaudio.idl: Constructor (BaseAudioContext context, optional BiquadFilterOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional ChannelMergerOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional ChannelSplitterOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional ConstantSourceOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional ConvolverOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional DelayOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional DynamicsCompressorOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional GainOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, IIRFilterOptions options)]
webaudio.idl: Constructor (AudioContext context, MediaElementAudioSourceOptions options)]
webaudio.idl: Constructor (AudioContext context, optional AudioNodeOptions options)]
webaudio.idl: Constructor (AudioContext context, MediaStreamAudioSourceOptions options)]
webaudio.idl: Constructor (AudioContext context, MediaStreamTrackAudioSourceOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional OscillatorOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional PannerOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional PeriodicWaveOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional StereoPannerOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, optional WaveShaperOptions options)]
webaudio.idl: Constructor (BaseAudioContext context, DOMString name, optional AudioWorkletNodeOptions options)]
webaudio.idl:Constructor (optional AudioWorkletNodeOptions options)]
webgl1.idl: Constructor(DOMString type,
webmidi.idl:[SecureContext, Constructor(DOMString type, optional MIDIMessageEventInit eventInitDict)]
webmidi.idl:[SecureContext, Constructor(DOMString type, optional MIDIConnectionEventInit eventInitDict)]
webrtc.idl:[ Constructor(optional RTCConfiguration configuration), Exposed=Window]
webrtc.idl:[ Constructor(RTCSessionDescriptionInit descriptionInitDict), Exposed=Window]
webrtc.idl:[ Constructor(optional RTCIceCandidateInit candidateInitDict), Exposed=Window]
webrtc.idl:[ Constructor(DOMString type, optional RTCPeerConnectionIceEventInit eventInitDict), Exposed=Window]
webrtc.idl:[ Constructor(DOMString type, RTCPeerConnectionIceErrorEventInit eventInitDict), Exposed=Window]
webrtc.idl:[ Constructor(DOMString type, RTCTrackEventInit eventInitDict), Exposed=Window]
webrtc.idl:[ Constructor(DOMString type, RTCDataChannelEventInit eventInitDict), Exposed=Window]
webrtc.idl:[ Constructor(DOMString type, RTCDTMFToneChangeEventInit eventInitDict), Exposed=Window]
webrtc.idl:[ Constructor(DOMString type, RTCStatsEventInit eventInitDict), Exposed=Window]
webrtc.idl: Constructor(RTCErrorInit init, optional DOMString message = "")] interface RTCError {
webrtc.idl: Constructor(DOMString type, RTCErrorEventInit eventInitDict)] interface RTCErrorEvent : Event {
webusb.idl: Constructor(DOMString type, USBConnectionEventInit eventInitDict),
webusb.idl: Constructor(USBTransferStatus status, optional DataView? data),
webusb.idl: Constructor(USBTransferStatus status, optional unsigned long bytesWritten = 0),
webusb.idl: Constructor(USBTransferStatus status, optional DataView? data),
webusb.idl: Constructor(sequence<USBIsochronousInTransferPacket> packets, optional DataView? data),
webusb.idl: Constructor(USBTransferStatus status, optional unsigned long bytesWritten = 0),
webusb.idl: Constructor(sequence<USBIsochronousOutTransferPacket> packets),
webusb.idl: Constructor(USBDevice device, octet configurationValue),
webusb.idl: Constructor(USBConfiguration configuration, octet interfaceNumber),
webusb.idl: Constructor(USBInterface deviceInterface, octet alternateSetting),
webusb.idl: Constructor(USBAlternateInterface alternate, octet endpointNumber, USBDirection direction),
webvtt.idl: Constructor(double startTime, double endTime, DOMString text)]
webvtt.idl: Constructor]
webxr.idl: Constructor(optional DOMPointInit position, optional DOMPointInit orientation)]
webxr.idl: Constructor(optional DOMPointInit origin, optional DOMPointInit direction),
webxr.idl: Constructor(XRRigidTransform transform)]
webxr.idl:[SecureContext, Exposed=Window, Constructor(XRSession session,
webxr.idl:[SecureContext, Exposed=Window, Constructor(DOMString type, XRSessionEventInit eventInitDict)]
webxr.idl:[SecureContext, Exposed=Window, Constructor(DOMString type, XRInputSourceEventInit eventInitDict)]
webxr.idl:[SecureContext, Exposed=Window, Constructor(DOMString type, XRReferenceSpaceEventInit eventInitDict)]
xhr.idl:[Constructor,
xhr.idl:[Constructor(optional HTMLFormElement form),
xhr.idl:[Constructor(DOMString type, optional ProgressEventInit eventInitDict),