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https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API Canvas API - Web APIs | MDN canvas apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API WebGL: 2D and 3D graphics for the web - Web APIs | MDN WebGL (Web Graphics Library) is a JavaScript API for rendering high-performance interactive 3D and 2D graphics within any compatible web browser without the... for the webwebglgraphicsapismdn https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API WebRTC API - Web APIs | MDN WebRTC (Web Real-Time Communication) is a technology that enables Web applications and sites to capture and optionally stream audio and/or video media, as well... api webwebrtcapismdn https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API Fetch API - Web APIs | MDN The Fetch API provides an interface for fetching resources (including across the network). It is a more powerful and flexible replacement for XMLHttpRequest. fetch apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/View_Transition_API View Transition API - Web APIs | MDN The View Transition API provides a mechanism for easily creating animated transitions between different website and element views. This includes animating... api webviewtransitionapismdn https://developer.mozilla.org/en-US/docs/Web/API/Request Request - Web APIs | MDN The Request interface of the Fetch API represents a resource request. web apisrequestmdn https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API WebSocket API (WebSockets) - Web APIs | MDN The WebSocket API makes it possible to open a two-way interactive communication session between the user's browser and a server. With this API, you can send... websocket apiwebsocketsapismdn https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage Window: postMessage() method - Web APIs | MDN The window.postMessage() method safely enables cross-origin communication between Window objects; e.g., between a page and a pop-up that it spawned, or between... web apiswindowpostmessagemethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch Using the Fetch API - Web APIs | MDN The Fetch API provides a JavaScript interface for making HTTP requests and processing the responses. fetch apiweb apisusingmdn https://developer.mozilla.org/en-US/docs/Web/API Web APIs | MDN When writing code for the Web, there are a large number of Web APIs available. Below is a list of all the APIs and interfaces (object types) that you may be... web apismdn https://developer.mozilla.org/en-US/docs/Web/API/WebCodecs_API WebCodecs API - Web APIs | MDN The WebCodecs API enables web developers to encode and decode video and audio in the browser efficiently (using hardware acceleration) and with very low-level... api webwebcodecsapismdn https://developer.mozilla.org/en-US/docs/Web/API/Window/fetch Window: fetch() method - Web APIs | MDN The fetch() method of the Window interface starts the process of fetching a resource from the network, returning a promise that is fulfilled once the response... web apiswindowfetchmethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Geolocation_API Geolocation API - Web APIs | MDN The Geolocation API allows the user to provide their location to web applications if they so desire. For privacy reasons, the user is asked for permission to... geolocation apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/stencilFunc WebGLRenderingContext: stencilFunc() method - Web APIs | MDN The WebGLRenderingContext.stencilFunc() method of the WebGL API sets the front and back function and reference value for stencil testing. web apismethodmdn https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API IndexedDB API - Web APIs | MDN IndexedDB is a low-level API for client-side storage of significant amounts of structured data, including files/blobs. This API uses indexes to enable... api webindexeddbapismdn https://developer.mozilla.org/en-US/docs/Web/API/Headers/Headers Headers: Headers() constructor - Web APIs | MDN The Headers() constructor creates a new Headers object. constructor webheadersapismdn https://developer.mozilla.org/en-US/docs/Web/API/File File - Web APIs | MDN The File interface provides information about files and allows JavaScript in a web page to access their content. web apisfilemdn https://developer.mozilla.org/en-US/docs/Web/API/EventTarget EventTarget - Web APIs | MDN The EventTarget interface is implemented by objects that can receive events and may have listeners for them. In other words, any target of events implements... web apiseventtargetmdn https://developer.mozilla.org/en-US/docs/Web/API/PaymentRequest PaymentRequest - Web APIs | MDN The Payment Request API's PaymentRequest interface is the primary access point into the API, and lets web content and apps accept payments from the end user on... web apismdn https://developer.mozilla.org/en-US/docs/Web/API/Node Node - Web APIs | MDN The DOM Node interface is an abstract base class upon which many other DOM API objects are based, thus letting those object types be used similarly and often... web apisnodemdn https://dotnet.microsoft.com/en-us/apps/aspnet/apis ASP.NET Web APIs - Rest APIs with .NET and C# | .NET Build secure REST APIs with C# that reach a broad range of clients, including browsers and mobile devices. Build and deploy on Linux, macOS, and Windows. asp netweb apisrestc https://developer.mozilla.org/en-US/docs/Web/API/Gamepad_API/Using_the_Gamepad_API Using the Gamepad API - Web APIs | MDN gamepad apiweb apisusingmdn https://developer.mozilla.org/en-US/docs/Web/API/CSS_Custom_Highlight_API CSS Custom Highlight API - Web APIs | MDN The CSS Custom Highlight API provides a mechanism for styling arbitrary text ranges on a document by using JavaScript to create the ranges, and CSS to style... api webcsscustomhighlightapis https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset HTMLElement: dataset property - Web APIs | MDN The dataset read-only property of the HTMLElement interface provides read/write access to custom data attributes (data-*) on elements. It exposes a map of... web apisdatasetpropertymdn https://developer.mozilla.org/en-US/docs/Web/API/Navigator/storage Navigator: storage property - Web APIs | MDN The Navigator.storage read-only property returns the singleton StorageManager object used to access the overall storage capabilities of the browser for the... storage propertyweb apisnavigatormdn https://developer.mozilla.org/en-US/docs/Web/API/NavigatorUAData NavigatorUAData - Web APIs | MDN The NavigatorUAData interface of the User-Agent Client Hints API returns information about the browser and operating system of a user. web apismdn https://developer.mozilla.org/en-US/docs/Web/API/Notification/Notification Notification: Notification() constructor - Web APIs | MDN The Notification() constructor creates a new Notification object instance, which represents a user notification. constructor webnotificationapismdn https://developer.mozilla.org/en-US/docs/Web/API/History_API History API - Web APIs | MDN The History API provides access to the browser's session history (not to be confused with WebExtensions history) through the history global object. It exposes... history apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API Intersection Observer API - Web APIs | MDN The Intersection Observer API provides a way to asynchronously observe changes in the intersection of a target element with an ancestor element or with a... intersection observer apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/Navigator/share Navigator: share() method - Web APIs | MDN The share() method of the Navigator interface invokes the native sharing mechanism of the device to share data such as text, URLs, or files. The available... web apisnavigatorsharemethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Document/cookie Document: cookie property - Web APIs | MDN The Document property cookie lets you read and write cookies associated with the document. It serves as a getter and setter for the actual values of the... web apisdocumentcookiepropertymdn https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API Service Worker API - Web APIs | MDN Service workers essentially act as proxy servers that sit between web applications, the browser, and the network (when available). They are intended, among... service workerapi webapismdn https://developer.mozilla.org/en-US/docs/Web/API/Location/href Location: href property - Web APIs | MDN The href property of the Location interface is a stringifier that returns a string containing the whole URL, and allows the href to be updated. web apislocationhrefpropertymdn https://developer.mozilla.org/en-US/docs/Web/API/Element/moveBefore Element: moveBefore() method - Web APIs | MDN The moveBefore() method of the Element interface moves a given Node inside the invoking node as a direct child, before a given reference node. web apiselementmethodmdn https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/arc CanvasRenderingContext2D: arc() method - Web APIs | MDN The CanvasRenderingContext2D.arc() method of the Canvas 2D API adds a circular arc to the current sub-path. web apisarcmethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Response Response - Web APIs | MDN The Response interface of the Fetch API represents the response to a request. web apisresponsemdn https://developer.mozilla.org/en-US/docs/Web/API/URL URL - Web APIs | MDN The URL interface is used to parse, construct, normalize, and encode URLs. It works by providing properties which allow you to easily read and modify the... web apisurlmdn https://developer.mozilla.org/en-US/docs/Web/API/Beacon_API Beacon API - Web APIs | MDN The Beacon API is used to send an asynchronous and non-blocking request to a web server. The request does not expect a response. Unlike requests made using... beacon apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readAsDataURL FileReader: readAsDataURL() method - Web APIs | MDN The readAsDataURL() method of the FileReader interface is used to read the contents of the specified Blob or File. When the read operation is finished, the... web apisfilereadermethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Request/cache Request: cache property - Web APIs | MDN The cache read-only property of the Request interface contains the cache mode of the request. It controls how the request will interact with the browser's HTTP... web apisrequestcachepropertymdn https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList DOMTokenList - Web APIs | MDN The DOMTokenList interface represents a set of space-separated tokens. Such a set is returned by Element.classList or HTMLLinkElement.relList, and many others. web apismdn https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events Server-sent events - Web APIs | MDN Traditionally, a web page has to send a request to the server to receive new data; that is, the page requests data from the server. With server-sent events,... server sent eventsweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement/alt HTMLImageElement: alt property - Web APIs | MDN web apisaltpropertymdn https://developer.mozilla.org/en-US/docs/Web/API/Window/requestAnimationFrame Window: requestAnimationFrame() method - Web APIs | MDN The window.requestAnimationFrame() method tells the browser you wish to perform an animation. It requests the browser to call a user-supplied callback function... web apiswindowrequestanimationframemethodmdn https://developer.mozilla.org/en-US/docs/Web/API/AbortController/AbortController AbortController: AbortController() constructor - Web APIs | MDN The AbortController() constructor creates a new AbortController object instance. constructor webabortcontrollerapismdn https://developer.mozilla.org/en-US/docs/Web/API/ReportingObserver ReportingObserver - Web APIs | MDN The ReportingObserver interface of the Reporting API allows you to collect and access reports. web apismdn https://developer.mozilla.org/en-US/docs/Web/API/BroadcastChannel/close BroadcastChannel: close() method - Web APIs | MDN The close() method of the BroadcastChannel interface terminates the connection to the underlying channel, allowing the object to be garbage collected. This is... web apisbroadcastchannelclosemethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Window/navigation Window: navigation property - Web APIs | MDN The navigation read-only property of the Window interface returns the current window's associated Navigation object. web apiswindownavigationpropertymdn https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/attachShader WebGLRenderingContext: attachShader() method - Web APIs | MDN The WebGLRenderingContext.attachShader() method of the WebGL API attaches either a fragment or vertex WebGLShader to a WebGLProgram. web apismethodmdn https://developer.mozilla.org/en-US/docs/Web/API/RTCError/sentAlert RTCError: sentAlert property - Web APIs | MDN The sentAlert read-only property of the RTCError interface specifies the DTLS alert number sent to the remote peer, if the error represents an outbound DTLS... web apispropertymdn https://developer.mozilla.org/en-US/docs/Web/API/RTCVideoSourceStats/id RTCVideoSourceStats: id property - Web APIs | MDN The id property of the RTCVideoSourceStats dictionary is a string which uniquely identifies the object for which this object provides statistics. web apisidpropertymdn https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent MouseEvent - Web APIs | MDN The MouseEvent interface represents events that occur due to the user interacting with a pointing device (such as a mouse). Common events using this interface... web apismouseeventmdn https://developer.mozilla.org/de/docs/Web/API/XPathExpression XPathExpression - Web-APIs | MDN Dieses Interface ist ein kompilierter XPath-Ausdruck, der auf einem Dokument oder einem spezifischen Knoten ausgewertet werden kann, um Informationen aus... web apismdn https://developer.mozilla.org/en-US/docs/Web/API/Sanitizer/setComments Sanitizer: setComments() method - Web APIs | MDN The setComments() method of the Sanitizer interface sets whether comments will be allowed or removed by the sanitizer. web apissanitizermethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Gamepad_API Gamepad API - Web APIs | MDN The Gamepad API is a way for developers to access and respond to signals from gamepads and other game controllers in a simple, consistent way. It contains... gamepad apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/ViewTransition ViewTransition - Web APIs | MDN The ViewTransition interface of the View Transition API represents an active view transition, and provides functionality to react to the transition reaching... web apismdn https://developer.mozilla.org/de/docs/Web/API/WebSockets_API/Writing_WebSocket_servers Schreiben von WebSocket-Servern - Web-APIs | MDN Ein WebSocket-Server ist nichts anderes als eine Anwendung, die auf einem beliebigen Port eines TCP-Servers horcht und einem bestimmten Protokoll folgt. Einen... web apisschreibenvonwebsocketservern https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/stencilFuncSeparate WebGLRenderingContext: stencilFuncSeparate() method - Web APIs | MDN The WebGLRenderingContext.stencilFuncSeparate() method of the WebGL API sets the front and/or back function and reference value for stencil testing. web apismethodmdn https://developer.mozilla.org/en-US/docs/Web/API/ValidityState/rangeOverflow ValidityState: rangeOverflow property - Web APIs | MDN web apispropertymdn https://developer.mozilla.org/en-US/docs/Web/API/IIRFilterNode IIRFilterNode - Web APIs | MDN The IIRFilterNode interface of the Web Audio API is an AudioNode processor which implements a general infinite impulse response (IIR) filter; this type of... web apismdn https://developer.mozilla.org/en-US/docs/Web/API/Audio_Output_Devices_API Audio Output Devices API - Web APIs | MDN The Audio Output Devices API allows web applications to prompt users about what output device should be used for audio playback. audio outputdevices apiweb apismdn https://developer.mozilla.org/de/docs/Web/API/SVGFEFuncRElement SVGFEFuncRElement - Web-APIs | MDN web apismdn https://developer.mozilla.org/en-US/docs/Web/API/SVGSwitchElement SVGSwitchElement - Web APIs | MDN web apismdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableRowElement/rowIndex HTMLTableRowElement: rowIndex property - Web APIs | MDN web apispropertymdn https://developer.mozilla.org/en-US/docs/Web/API/GPUComputePassEncoder/end GPUComputePassEncoder: end() method - Web APIs | MDN The end() method of the GPUComputePassEncoder interface completes recording of the current compute pass command sequence. web apisendmethodmdn https://developer.mozilla.org/en-US/docs/Web/API/VTTCue/lineAlign VTTCue: lineAlign property - Web APIs | MDN The lineAlign property of the VTTCue interface represents the alignment of this VTT cue. web apispropertymdn https://developer.mozilla.org/en-US/docs/Web/API/TextTrack/mode TextTrack: mode property - Web APIs | MDN The TextTrack interface's mode property is a string specifying and controlling the text track's mode: disabled, hidden, or showing. You can read this value to... web apistexttrackmodepropertymdn https://developer.mozilla.org/de/docs/Web/API/ElementInternals/ariaRoleDescription ElementInternals: ariaRoleDescription-Eigenschaft - Web-APIs | MDN Die ariaRoleDescription-Eigenschaft des ElementInternals-Interfaces spiegelt den Wert des aria-roledescription-Attributs wider, welches eine menschenlesbare,... web apiseigenschaftmdn https://developer.mozilla.org/en-US/docs/Web/API/TextDecoderStream/writable TextDecoderStream: writable property - Web APIs | MDN The writable read-only property of the TextDecoderStream interface returns a WritableStream that accepts binary data, in the form of ArrayBuffer, TypedArray,... web apistextdecoderstreamwritablepropertymdn https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events?ref=rylan.io Server-sent events - Web APIs | MDN Traditionally, a web page has to send a request to the server to receive new data; that is, the page requests data from the server. With server-sent events,... server sent eventsweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/MediaQueryListEvent/matches MediaQueryListEvent: matches property - Web APIs | MDN The matches read-only property of the MediaQueryListEvent interface is a boolean value that is true if the document currently matches the media query list, or... web apismatchespropertymdn https://developer.mozilla.org/en-US/docs/Web/API/Metadata Metadata - Web APIs | MDN The Metadata interface contains information about a file system entry. This metadata includes the file's size and modification date and time. web apismetadatamdn https://developer.mozilla.org/en-US/docs/Web/API/NotRestoredReasonDetails/reason NotRestoredReasonDetails: reason property - Web APIs | MDN The reason read-only property of the NotRestoredReasonDetails interface returns a string describing a reason that the page was blocked from using the... web apisreasonpropertymdn https://developer.mozilla.org/en-US/docs/Web/API/CSS/registerProperty_static CSS: registerProperty() static method - Web APIs | MDN The CSS.registerProperty() static method registers custom properties, allowing for property type checking, default values, and properties that do or do not... static methodweb apiscssmdn https://developer.mozilla.org/en-US/docs/Web/API/SourceBuffer/textTracks SourceBuffer: textTracks property - Web APIs | MDN The textTracks read-only property of the SourceBuffer interface returns a list of the text tracks currently contained inside the SourceBuffer. web apispropertymdn https://developer.mozilla.org/en-US/docs/Web/API/VideoFrame/VideoFrame VideoFrame: VideoFrame() constructor - Web APIs | MDN The VideoFrame() constructor creates a new VideoFrame object representing a frame of a video. constructor webvideoframeapismdn https://developer.mozilla.org/en-US/docs/Web/API/GPURenderPassEncoder/setVertexBuffer GPURenderPassEncoder: setVertexBuffer() method - Web APIs | MDN The setVertexBuffer() method of the GPURenderPassEncoder interface sets or unsets the current GPUBuffer for the given slot that will provide vertex data for... web apismethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Navigator/virtualKeyboard Navigator: virtualKeyboard property - Web APIs | MDN The virtualKeyboard read-only property of the navigator interface returns a reference to the VirtualKeyboard instance object. web apisnavigatorpropertymdn https://developer.mozilla.org/de/docs/Web/API/EXT_disjoint_timer_query/queryCounterEXT EXT_disjoint_timer_query: queryCounterEXT() Methode - Web-APIs | MDN Die EXT_disjoint_timer_query.queryCounterEXT() Methode der WebGL API zeichnet die aktuelle Zeit im entsprechenden Abfrageobjekt auf. web apisextdisjointtimerquery https://developer.mozilla.org/de/docs/Web/API/SVGFEFuncGElement SVGFEFuncGElement - Web-APIs | MDN web apismdn https://developer.mozilla.org/en-US/docs/Web/API/ExtendableCookieChangeEvent/changed ExtendableCookieChangeEvent: changed property - Web APIs | MDN The changed read-only property of the ExtendableCookieChangeEvent interface returns any cookies that have been changed by the given ExtendableCookieChangeEvent... web apischangedpropertymdn https://developer.mozilla.org/en-US/docs/Web/API/Element/animate Element: animate() method - Web APIs | MDN The Element interface's animate() method is a shortcut method which creates a new Animation, applies it to the element, then plays the animation. It returns... web apiselementanimatemethodmdn https://developer.mozilla.org/de/docs/Web/API/SVGTitleElement SVGTitleElement - Web-APIs | MDN web apismdn https://developer.mozilla.org/en-US/docs/Web/API/MediaSession/playbackState MediaSession: playbackState property - Web APIs | MDN The playbackState property of the MediaSession interface indicates whether the current media session is playing or paused. web apispropertymdn https://developer.mozilla.org/en-US/docs/Web/API/CSSRule/type CSSRule: type property - Web APIs | MDN The read-only type property of the CSSRule interface is a deprecated property that returns an integer indicating which type of rule the CSSRule represents. web apiscssruletypepropertymdn https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection/icecandidate_event RTCPeerConnection: icecandidate event - Web APIs | MDN An icecandidate event is sent to an RTCPeerConnection when: event webrtcpeerconnectionapismdn https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API/Using_WebSocketStream Using WebSocketStream to write a client - Web APIs | MDN The WebSocketStream API is a Promise-based alternative to WebSocket for creating and using client-side WebSocket connections. WebSocketStream uses the Streams... to writea clientweb apisusingmdn https://developer.mozilla.org/en-US/docs/Web/API/HTML_Drag_and_Drop_API?ref=time2hack.com HTML Drag and Drop API - Web APIs | MDN HTML Drag and Drop interfaces enable applications to use drag-and-drop features in browsers. drag and dropapi webhtmlapismdn https://developer.mozilla.org/de/docs/Web/API/Navigator/webdriver Navigator: webdriver-Eigenschaft - Web-APIs | MDN Die webdriver Eigenschaft, die nur gelesen werden kann, des navigator-Interfaces gibt an, ob der User-Agent durch Automation gesteuert wird. web apisnavigatorwebdrivereigenschaftmdn https://developer.mozilla.org/en-US/docs/Web/API/RTCTransportStats/id RTCTransportStats: id property - Web APIs | MDN The id property of the RTCTransportStats dictionary is a string which uniquely identifies the object for which this object provides statistics. web apisidpropertymdn https://developer.mozilla.org/en-US/docs/Web/API/XRCylinderLayer/space XRCylinderLayer: space property - Web APIs | MDN The space property of the XRCylinderLayer interface represents the layer's spatial relationship with the user's physical environment. web apisspacepropertymdn https://developer.mozilla.org/de/docs/Web/API/VRDisplay/requestAnimationFrame VRDisplay: requestAnimationFrame() Methode - Web-APIs | MDN Die requestAnimationFrame()-Methode der VRDisplay-Schnittstelle ist eine spezielle Implementierung von Window.requestAnimationFrame, die eine Callback-Funktion... web apisrequestanimationframemethodemdn https://developer.mozilla.org/en-US/docs/Web/API/XRAnchorSet XRAnchorSet - Web APIs | MDN The XRAnchorSet interface exposes a collection of anchors. Its instances are returned by XRFrame.trackedAnchors and are Set-like objects. web apismdn https://developer.mozilla.org/en-US/docs/Web/API/GamepadHapticActuator/effects GamepadHapticActuator: effects property - Web APIs | MDN The effects read-only property of the GamepadHapticActuator interface returns an array of enumerated values representing the different haptic effects that the... web apiseffectspropertymdn https://developer.mozilla.org/en-US/docs/Web/API/BluetoothDevice BluetoothDevice - Web APIs | MDN The BluetoothDevice interface of the Web Bluetooth API represents a Bluetooth device inside a particular script execution environment. web apismdn https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/colorMask WebGLRenderingContext: colorMask() method - Web APIs | MDN The WebGLRenderingContext.colorMask() method of the WebGL API sets which color components to enable or to disable when drawing or rendering to a... web apismethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Node/insertBefore Node: insertBefore() method - Web APIs | MDN The insertBefore() method of the Node interface inserts a node before a reference node as a child of a specified parent node. web apisnodemethodmdn https://developer.mozilla.org/en-US/docs/Web/API/Push_API?ref=library.linkbot.com Push API - Web APIs | MDN The Push API gives web applications the ability to receive messages pushed to them from a server, whether or not the web app is in the foreground, or even... push apiweb apismdn https://developer.mozilla.org/en-US/docs/Web/API/CompositionEvent/initCompositionEvent CompositionEvent: initCompositionEvent() method - Web APIs | MDN The initCompositionEvent() method of the CompositionEvent interface initializes the attributes of a CompositionEvent object instance. web apismethodmdn https://developer.mozilla.org/en-US/docs/Web/API/XRCompositionLayer/layout XRCompositionLayer: layout property - Web APIs | MDN The read-only layout property of the XRCompositionLayer interface is the layout type of the layer. web apislayoutpropertymdn