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  1. JavaScript basics - Learn web development | MDN

    JavaScript is a programming language that adds interactivity to your website. This happens in games, in the behavior of responses when buttons are pressed or with data entry on forms; with dynamic styling; with animation, etc. This article helps you get started with JavaScript and furthers your understanding of what is possible....js , and save it. In your index...html <script src="scripts/main.js"></script> This is doing the...

    developer.mozilla.org/en-US/docs/Learn/Getting_...
  2. SyntaxError: continue must be inside loop - Jav...

    The JavaScript exception "continue must be inside loop" occurs when a continue statement is not inside a loop statement.... js array.forEach((value) => { if...// do something with value }); js array.forEach((value) => { if...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  3. CustomElementRegistry: define() method - Web AP...

    Learn about the CustomElementRegistry.define() method, including its syntax, code examples, specifications, and browser compatibility.... Syntax js define(name, constructor) define(name...minimal autonomous custom element: js class MyAutonomousElement extends...

    developer.mozilla.org/en-US/docs/Web/API/Custom...
  4. HTMLMediaElement: canplay event - Web APIs | MDN

    Learn about the canplay event, including its type and syntax, code examples, specifications, and browser compatibility.... js addEventListener("canplay", (event)...firing. Using addEventListener() : js const video = document.querySelector("video");...

    developer.mozilla.org/en-US/docs/Web/API/HTMLMe...
  5. Unary plus (+) - JavaScript | MDN

    The unary plus (+) operator precedes its operand and evaluates to its operand but attempts to convert it into a number, if it isn't already.... Try it Syntax js +x Description Although unary... Examples Usage with numbers js const x = 1; const y = -1; console...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  6. WebTransport API - Web APIs | MDN

    The WebTransport API provides a modern update to WebSockets, transmitting data between client and server using HTTP/3 Transport. WebTransport provides support for multiple streams, unidirectional streams, and out-of-order delivery. It enables reliable transport via streams and unreliable transport via UDP-like datagrams.... js const url = "https://example...for transmission to the server: js const writer = transport.datagrams...

    developer.mozilla.org/en-US/docs/Web/API/WebTra...
  7. RangeError: invalid date - JavaScript | MDN

    The JavaScript exception "invalid date" occurs when an invalid date is attempted to be converted to an ISO date string.... Examples Invalid cases js const invalid = new Date("nothing");...methods return special values: js invalid.toString(); // "Invalid...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  8. Strict mode - JavaScript | MDN

    JavaScript's strict mode is a way to opt in to a restricted variant of JavaScript, thereby implicitly opting-out of "sloppy mode". Strict mode isn't just a subset: it intentionally has different semantics from normal code. Browsers not supporting strict mode will run strict mode code with different behavior from browsers that do, so don't rely on strict mode without feature-testing for support for the relevant aspects of strict mode. Strict mode code and non-strict mode code can coexist, so scripts can opt into strict mode incrementally.... js // Whole-script strict mode syntax...before any other statements. js function myStrictFunction() {...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  9. globalThis - JavaScript | MDN

    The globalThis global property contains the global this value, which is usually akin to the global object....js none of these work, and you must...accessible as global variables. js console.log(window.Math === Math);...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  10. Content Index API - Web APIs | MDN

    The Content Index API allows developers to register their offline enabled content with the browser.... js // reference registration const...register it with the content index. js // our content const item = {...

    developer.mozilla.org/en-US/docs/Web/API/Conten...