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https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/submit_event HTMLFormElement: submit event - Web APIs | MDN submit event web apis htmlformelement mdn https://blog.logrocket.com/anti-frameworkism-native-web-apis Anti-frameworkism: Choosing native web APIs over frameworks - LogRocket Blog Mar 27, 2026 - Modern browsers can handle more than you think. Learn when native web APIs are enough—and when frameworks actually make sense. native web anti choosing apis frameworks https://developer.mozilla.org/en-US/docs/Web/API/FileList FileList - Web APIs | MDN web apis filelist mdn 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 apis file mdn https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events Using server-sent events - Web APIs | MDN Developing a web application that uses server-sent events is straightforward. You'll need a bit of code on the server to stream events to the front-end, but... web apis using server sent events https://developer.mozilla.org/en-US/docs/Web/API/ByteLengthQueuingStrategy ByteLengthQueuingStrategy - Web APIs | MDN The ByteLengthQueuingStrategy interface of the Streams API provides a built-in byte length queuing strategy that can be used when constructing streams. web apis bytelengthqueuingstrategy mdn https://developer.mozilla.org/en-US/docs/Web/API/Headers Headers - Web APIs | MDN The Headers interface of the Fetch API allows you to perform various actions on HTTP request and response headers. These actions include retrieving, setting,... web apis headers mdn Sponsored https://wannahookup.com/ WannaHookUp - WannaHookUp Join our online social adult community WannaHookUp https://developer.mozilla.org/en-US/docs/Web/API/TextEncoderStream TextEncoderStream - Web APIs | MDN The TextEncoderStream interface of the Encoding API converts a stream of strings into bytes in the UTF-8 encoding. It is the streaming equivalent of... web apis textencoderstream mdn https://developer.mozilla.org/en-US/docs/Web/API/FormData FormData - Web APIs | MDN The FormData interface provides a way to construct a set of key/value pairs representing form fields and their values, which can be sent using the fetch(),... web apis formdata mdn https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder TextEncoder - Web APIs | MDN The TextEncoder interface enables you to encode a JavaScript string using UTF-8. web apis textencoder mdn https://developer.mozilla.org/en-US/docs/Web/API/URLPattern URLPattern - Web APIs | MDN The URLPattern interface of the URL Pattern API matches URLs or parts of URLs against a pattern. The pattern can contain capturing groups that extract parts of... web apis urlpattern mdn https://developer.mozilla.org/en-US/docs/Web/API/URL/URL URL: URL() constructor - Web APIs | MDN The URL() constructor returns a newly created URL object representing the URL defined by the parameters. web apis url constructor mdn https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamBYOBRequest ReadableStreamBYOBRequest - Web APIs | MDN The ReadableStreamBYOBRequest interface of the Streams API represents a web apis readablestreambyobrequest mdn 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 apis eventtarget mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceMark PerformanceMark - Web APIs | MDN PerformanceMark is an interface for PerformanceEntry objects with an entryType of web apis performancemark mdn https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API Canvas API - Web APIs | MDN canvas api web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/Element/classList Element: classList property - Web APIs | MDN The read-only classList property of the Element interface contains a live DOMTokenList collection representing the class attribute of the element. This can... web apis element classlist property mdn https://developer.mozilla.org/en-US/docs/Web/API/ErrorEvent ErrorEvent - Web APIs | MDN The ErrorEvent interface represents events providing information related to errors in scripts or in files. web apis errorevent mdn https://developer.mozilla.org/en-US/docs/Web/API/CompressionStream CompressionStream - Web APIs | MDN The CompressionStream interface of the Compression Streams API compresses a stream of data. It implements the same shape as a TransformStream, allowing it to... web apis compressionstream mdn https://developer.mozilla.org/en-US/docs/Web/API/XRHitTestSource XRHitTestSource - Web APIs | MDN The XRHitTestSource interface of the WebXR Device API handles hit test subscriptions. You can get an XRHitTestSource object by using the... web apis mdn 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 apis mdn https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code KeyboardEvent: code property - Web APIs | MDN The KeyboardEvent.code property represents a physical key on the keyboard (as opposed to the character generated by pressing the key). In other words, this... web apis code property mdn https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultReader ReadableStreamDefaultReader - Web APIs | MDN The ReadableStreamDefaultReader interface of the Streams API represents a default reader that can be used to read stream data supplied from a network (such as... web apis readablestreamdefaultreader mdn https://developer.mozilla.org/en-US/docs/Web/API/XRHand XRHand - Web APIs | MDN The XRHand interface is pair iterator (an ordered map) with the key being the hand joints and the value being an XRJointSpace. web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceMeasure PerformanceMeasure - Web APIs | MDN PerformanceMeasure is an abstract interface for PerformanceEntry objects with an entryType of web apis performancemeasure mdn https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial Canvas tutorial - Web APIs | MDN web apis canvas tutorial mdn https://developer.mozilla.org/en-US/docs/Web/API/Navigator Navigator - Web APIs | MDN The Navigator interface represents the state and the identity of the user agent. It allows scripts to query it and to register themselves to carry on some... web apis navigator mdn https://heise-academy.de/classroom-sessions/ethical-hacking-deep-dive626_owasp Schwachstellen in Webanwendungen und Web-APIs nutzen – fortgeschrittene Techniken | heise academy Unser Experte geht in dieser Session über die OWASP Top 10 hinaus und zeigt dir fortgeschrittene Techniken, die ein besonderes Risiko darstellen. web apis heise academy webanwendungen und nutzen https://remix.run/ Remix - A Full Stack Framework Built on Web APIs Remix 3 is under active development. Remix is a batteries-included, ultra-productive, zero dependency framework ready to use in a model-first world. full stack built on web apis remix framework 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 apis navigator share method mdn 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. web apis asp rest https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection/createOffer RTCPeerConnection: createOffer() method - Web APIs | MDN The createOffer() method of the RTCPeerConnection interface initiates the creation of an SDP offer for the purpose of starting a new WebRTC connection to a... web apis method mdn https://developer.mozilla.org/en-US/docs/Web/API/WritableStream WritableStream - Web APIs | MDN The WritableStream interface of the Streams API provides a standard abstraction for writing streaming data to a destination, known as a sink. This object comes... web apis writablestream mdn https://developer.mozilla.org/en-US/docs/Web/API/TextDecoderStream TextDecoderStream - Web APIs | MDN The TextDecoderStream interface of the Encoding API converts a stream of text in a binary encoding, such as UTF-8 etc., to a stream of strings. It is the... web apis textdecoderstream mdn https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand Document: execCommand() method - Web APIs | MDN The execCommand method implements multiple different commands. Some of them provide access to the clipboard, while others are for editing form inputs,... web apis document method mdn https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent CloseEvent - Web APIs | MDN A CloseEvent is sent to clients using WebSockets when the connection is closed. This is delivered to the listener indicated by the WebSocket object's onclose... web apis closeevent mdn https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams URLSearchParams - Web APIs | MDN The URLSearchParams interface defines utility methods to work with the query string of a URL. web apis urlsearchparams mdn https://developer.mozilla.org/en-US/docs/Web/API/AbortController AbortController - Web APIs | MDN The AbortController interface represents a controller object that allows you to abort one or more Web requests as and when desired. web apis abortcontroller mdn Sponsored https://www.adulttime.com/ Unlimited Adult Movies Online | Adult Porn Time | Adult Time Adult Time is an award-winning adult porn streaming platform! Watch adult movies online and discover new series from the most popular studios in the industry! https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest XMLHttpRequest - Web APIs | MDN XMLHttpRequest (XHR) objects are used to interact with servers. You can retrieve data from a URL without having to do a full page refresh. This enables a Web... web apis xmlhttprequest mdn Sponsored https://ourdream.ai/ ourdream.ai | Ultimate Adult AI Playground | Unlimited Chat, Pics, Videos, and more. The ultimate adult AI playground. Create unlimited dream companions and explore your every desire. Stunning pics, HD videos, unlimited roleplay, and much more... 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... web apis indexeddb mdn 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 apis window requestanimationframe method mdn https://apiconference.net/ API Conference Series | Web APIs, Design & Management api conference web apis design management series https://apidocjs.com/ apiDoc - Inline Documentation for RESTful web APIs documentation for web apis inline restful Sponsored https://www.fanvue.com/isla-king Isla King - Fanvue Hi I'm Isla! After way too much overthinking (and a million should I really do this moments), I finally took the leap. I'm just a girl who's never... https://developer.mozilla.org/en-US/docs/Web/API/Window/btoa Window: btoa() method - Web APIs | MDN The btoa() method of the Window interface creates a Base64-encoded ASCII string from a binary string (i.e., a string in which each character in the string is... web apis window method mdn https://developer.mozilla.org/en-US/docs/Web/API/Cache Cache - Web APIs | MDN The Cache interface provides a persistent storage mechanism for Request / Response object pairs that are cached in long lived memory. How long a Cache object... web apis cache mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/caches Window: caches property - Web APIs | MDN The caches read-only property of the Window interface returns the CacheStorage object associated with the current context. This object enables functionality... web apis window caches property mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/close Window: close() method - Web APIs | MDN The Window.close() method closes the current window, or the window on which it was called. web apis window close method mdn 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 apis window fetch method mdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement/contentWindow HTMLIFrameElement: contentWindow property - Web APIs | MDN The contentWindow property returns the Window object of an HTMLIFrameElement. web apis htmliframeelement property mdn https://developer.mozilla.org/en-US/docs/Web/API/console console - Web APIs | MDN The console object provides access to the debugging console (e.g., the Web console in Firefox). web apis console mdn https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver ResizeObserver - Web APIs | MDN The ResizeObserver interface reports changes to the dimensions of an Element's content or border box, or the bounding box of an SVGElement. web apis resizeobserver mdn https://developer.mozilla.org/en-US/docs/Web/API/BroadcastChannel BroadcastChannel - Web APIs | MDN The BroadcastChannel interface represents a named channel that any browsing context of a given origin can subscribe to. It allows communication between... web apis broadcastchannel mdn https://developer.mozilla.org/en-US/docs/Web/API/Event Event - Web APIs | MDN The Event interface represents an event which takes place on an EventTarget. web apis event mdn https://developer.mozilla.org/en-US/docs/Web/API/XRWebGLLayer XRWebGLLayer - Web APIs | MDN The XRWebGLLayer interface of the WebXR Device API provides a linkage between the WebXR device (or simulated XR device, in the case of an inline session) and a... web apis xrwebgllayer mdn https://developer.mozilla.org/en-US/docs/Web/API/Event/isTrusted Event: isTrusted property - Web APIs | MDN The isTrusted read-only property of the Event interface is a boolean value that is true when the event was generated by the user agent (including via user... web apis event property mdn https://developer.mozilla.org/en-US/docs/Web/API/Worker Worker - Web APIs | MDN The Worker interface of the Web Workers API represents a background task that can be created via script, which can send messages back to its creator. web apis worker mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/crypto Window: crypto property - Web APIs | MDN The crypto read-only property of the Window interface returns the Crypto object for this window's scope. This object gives web pages access to certain... web apis window crypto property mdn 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 apis window postmessage method mdn 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 apis response mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/clearInterval Window: clearInterval() method - Web APIs | MDN The clearInterval() method of the Window interface cancels a timed, repeating action which was previously established by a call to setInterval(). If the... web apis window method mdn Sponsored https://www.fanvue.com/maisxlife Mai - Fanvue I have a lot to show you. A little snapshot of what to expect on my page: everything. Come dm me so I can show you... https://developer.mozilla.org/en-US/docs/Web/API/Window/setInterval Window: setInterval() method - Web APIs | MDN The setInterval() method of the Window interface repeatedly calls a function or executes a code snippet, with a fixed time delay between each call. web apis window method mdn https://developer.mozilla.org/en-US/docs/Web/API/ReadableByteStreamController ReadableByteStreamController - Web APIs | MDN The ReadableByteStreamController interface of the Streams API represents a controller for a readable byte stream. It allows control of the state and internal... web apis readablebytestreamcontroller mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/setTimeout Window: setTimeout() method - Web APIs | MDN The setTimeout() method of the Window interface sets a timer which executes a function or specified piece of code once the timer expires. web apis window settimeout method mdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLCollection HTMLCollection - Web APIs | MDN The HTMLCollection interface represents a generic collection (array-like object similar to arguments) of elements (in document order) and offers methods and... web apis htmlcollection mdn https://developer.mozilla.org/en-US/docs/Web/API/Performance Performance - Web APIs | MDN The Performance interface provides access to performance-related information for the current page. web apis performance mdn https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener EventTarget: addEventListener() method - Web APIs | MDN The addEventListener() method of the EventTarget interface sets up a function that will be called whenever the specified event is delivered to the target. web apis eventtarget addeventlistener method mdn Sponsored https://faphouse.com/ FapHouse: Full-Length Porn Videos & XXX Movies - Download Sex Videos in Full HD and 4K Watch full-length porn videos and XXX movies from premium producers on FapHouse. Download sex videos featuring the hottest pornstars and kinkiest models! https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/enumerateDevices MediaDevices: enumerateDevices() method - Web APIs | MDN The enumerateDevices() method of the MediaDevices interface requests a list of the currently available media input and output devices, such as microphones,... web apis method mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/clearTimeout Window: clearTimeout() method - Web APIs | MDN The clearTimeout() method of the Window interface cancels a timeout previously established by calling Window.setTimeout(). web apis window method mdn https://developer.mozilla.org/en-US/docs/Web/API/CryptoKey CryptoKey - Web APIs | MDN The CryptoKey interface of the Web Crypto API represents a cryptographic key obtained from one of the SubtleCrypto methods generateKey(), deriveKey(),... web apis cryptokey mdn https://developer.mozilla.org/en-US/docs/Web/API/PromiseRejectionEvent PromiseRejectionEvent - Web APIs | MDN The PromiseRejectionEvent interface represents events which are sent to the global script context when JavaScript Promises are rejected. These events are... web apis promiserejectionevent mdn 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 apis element method mdn https://developer.mozilla.org/en-US/docs/Web/API/Document/scrollend_event Document: scrollend event - Web APIs | MDN The scrollend event fires when the document view has completed scrolling. Scrolling is considered completed when the scroll position has no more pending... web apis document scrollend event mdn https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultWriter WritableStreamDefaultWriter - Web APIs | MDN The WritableStreamDefaultWriter interface of the Streams API is the object returned by WritableStream.getWriter() and once created locks the writer to the... web apis writablestreamdefaultwriter mdn https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope WorkerGlobalScope - Web APIs | MDN The WorkerGlobalScope interface of the Web Workers API is an interface representing the scope of any worker. Workers have no browsing context; this scope... web apis workerglobalscope mdn https://developer.mozilla.org/en-US/docs/Web/API/ProgressEvent ProgressEvent - Web APIs | MDN web apis progressevent mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/performance Window: performance property - Web APIs | MDN The performance property of the Window interface returns a Performance object, which can be used to gather performance information about code running in the... web apis window performance property mdn https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream ReadableStream - Web APIs | MDN The ReadableStream interface of the Streams API represents a readable stream of byte data. The Fetch API offers a concrete instance of a ReadableStream through... web apis readablestream mdn https://developer.mozilla.org/en-US/docs/Web/API/DOMException DOMException - Web APIs | MDN The DOMException interface represents an abnormal event (called an exception) that occurs as a result of calling a method or accessing a property of a web API.... web apis domexception mdn https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent MessageEvent - Web APIs | MDN The MessageEvent interface represents a message received by a target object. web apis messageevent mdn https://developer.mozilla.org/en-US/docs/Web/API/File_System_API File System API - Web APIs | MDN The File System API — with extensions provided via the File System Access API to access files on the device file system — allows read, write and file... file system api web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/BeforeUnloadEvent BeforeUnloadEvent - Web APIs | MDN The BeforeUnloadEvent interface represents the event object for the beforeunload event, which is fired when the current window, contained document, and... web apis beforeunloadevent mdn https://developer.mozilla.org/en-US/docs/Web/API/Topics_API Topics API - Web APIs | MDN The Topics API provides a mechanism for developers to implement use cases such as interest-based advertising (IBA) based on topics collected by the browser as... web apis topics mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/atob Window: atob() method - Web APIs | MDN The atob() method of the Window interface decodes a string of data which has been encoded using Base64 encoding. You can use the Window.btoa() method to encode... web apis window atob method mdn https://developer.mozilla.org/en-US/docs/Web/API/WorkerLocation WorkerLocation - Web APIs | MDN The WorkerLocation interface defines the absolute location of the script executed by the Worker. Such an object is initialized for each worker and is available... web apis workerlocation mdn https://developer.mozilla.org/en-US/docs/Web/API/MessagePort MessagePort - Web APIs | MDN The MessagePort interface of the Channel Messaging API represents one of the two ports of a MessageChannel, allowing messages to be sent from one port and... web apis messageport mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEntry PerformanceEntry - Web APIs | MDN The PerformanceEntry object encapsulates a single performance metric that is part of the browser's performance timeline. web apis performanceentry mdn https://developer.mozilla.org/en-US/docs/Web/API/DecompressionStream DecompressionStream - Web APIs | MDN The DecompressionStream interface of the Compression Streams API decompresses a stream of data. It implements the same shape as a TransformStream, allowing it... web apis decompressionstream mdn https://developer.mozilla.org/en-US/docs/Web/API/Crypto Crypto - Web APIs | MDN The Crypto interface represents basic cryptography features available in the current context. It allows access to a cryptographically strong random number... web apis crypto mdn https://developer.mozilla.org/en-US/docs/Web/API/WebXR_Device_API/Lighting Lighting a WebXR setting - Web APIs | MDN Because the WebXR Device API relies on other technologies—namely, WebGL and frameworks based upon it—to perform all rendering, texturing, and lighting of a... web apis lighting webxr setting mdn 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 apis url mdn https://developer.mozilla.org/en-US/docs/Web/API/MessageChannel MessageChannel - Web APIs | MDN The MessageChannel interface of the Channel Messaging API allows us to create a new message channel and send data through it via its two MessagePort properties. web apis messagechannel mdn https://learn.microsoft.com/en-us/aspnet/core/web-api/?view=aspnetcore-10.0 Create web APIs with ASP.NET Core | Microsoft Learn Learn the basics of creating a web API in ASP.NET Core. web apis microsoft learn create asp core https://developer.mozilla.org/en-US/docs/Web/API/Location Location - Web APIs | MDN The Location interface represents the location (URL) of the object it is linked to. Changes done on it are reflected on the object it relates to. Both the... web apis location mdn https://developer.mozilla.org/en-US/docs/Web/API/Storage Storage - Web APIs | MDN The Storage interface of the Web Storage API provides access to a particular domain's session or local storage. It allows, for example, the addition,... web apis storage mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/alert Window: alert() method - Web APIs | MDN window.alert() instructs the browser to display a dialog with an optional message, and to wait until the user dismisses the dialog. web apis window alert method mdn https://developer.mozilla.org/en-US/docs/Web/API/CacheStorage CacheStorage - Web APIs | MDN The CacheStorage interface represents the storage for Cache objects. web apis cachestorage mdn https://naftiko.io/whitepapers/from-web-apis-to-a-web-of-capabilities/ From Web APIs to a Web of Capabilities: The Journey to AI Integration | Naftiko Embrace your API legacy, integrate your AI future. Naftiko turns API sprawl into a governed capability fleet that teams can depend on. web apis the journey ai integration capabilities https://developer.mozilla.org/en-US/docs/Web/API/TextDecoder TextDecoder - Web APIs | MDN The TextDecoder interface represents a decoder for a specific text encoding, such as UTF-8, ISO-8859-2, or GBK. A decoder takes an array of bytes as input and... web apis textdecoder mdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/change_event HTMLElement: change event - Web APIs | MDN web apis htmlelement change event mdn https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent CustomEvent - Web APIs | MDN The CustomEvent interface can be used to attach custom data to an event generated by an application. web apis customevent mdn