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js

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  1. Working with Svelte stores - Learn web developm...

    In this article we added two new features: an Alert component and persisting todos to web storage....js , inside your src directory....Give it the following content: js import { writable } from "svelte/store";...

    developer.mozilla.org/en-US/docs/Learn/Tools_an...
  2. What are browser developer tools? - Learn web d...

    Every modern web browser includes a powerful suite of developer tools. These tools do a range of things, from inspecting currently-loaded HTML, CSS and JavaScript to showing which assets the page has requested and how long they took to load. This article explains how to use the basic functions of your browser's devtools....js, a breakpoint has been set on...then pressing Enter): js alert("hello!"); js document.querySelector("html")...

    developer.mozilla.org/en-US/docs/Learn/Common_q...
  3. Implementing feature detection - Learn web deve...

    This article covered feature detection in a reasonable amount of detail, going through the main concepts and showing you how to implement your own feature detection tests....something like the following: js if ("geolocation" in navigator)...with the following JavaScript js const conditional = document...

    developer.mozilla.org/en-US/docs/Learn/Tools_an...
  4. NavigationPreloadManager - Web APIs | MDN

    Learn about the NavigationPreloadManager interface, including its methods, code examples, specifications, and browser compatibility.... js addEventListener("activate",...promise for that fetch operation. js addEventListener("fetch", (event)...

    developer.mozilla.org/en-US/docs/Web/API/Naviga...
  5. Keyed collections - JavaScript | MDN

    This chapter introduces collections of data which are indexed by a key; Map and Set objects contain elements which are iterable in the order of insertion.... js const sayings = new Map(); sayings...not exported from the module. js const privates = new WeakMap();...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  6. HTMLTrackElement: track property - Web APIs | MDN

    Learn about the HTMLTrackElement.track property, including its type, specifications and browser compatibility.... Example js const trackElement = document...

    developer.mozilla.org/en-US/docs/Web/API/HTMLTr...
  7. print.css

    .md h1,.md h2,.md h3,.md h4,.md h5,.md h6{margin-top:17px}.md h1{font-size:30px}.md h2{font-size:22px}.md h3{font-size:18px;font-weight:600}header,nav,nav.navbar-collapse,nav.navbar-collapse.collap......flash-container,#js-peek{display:none !important...

    consulting.groupdocs.com/css/print.css
  8. Promise - JavaScript | MDN

    The Promise object represents the eventual completion (or failure) of an asynchronous operation and its resulting value.... For example: js new Promise((resolveOuter) =>...can be chained. For example: js const myPromise = new Promise((resolve...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
  9. Local Font Access API - Web APIs | MDN

    The Local Font Access API provides a mechanism to access the user's locally installed font data — this includes higher-level details such as names, styles, and families, as well as the raw bytes of the underlying font files.... Feature detection js if ("queryLocalFonts" in window)...populate a font-picker control. js async function logFontData()...

    developer.mozilla.org/en-US/docs/Web/API/Local_...
  10. <script>: スクリプト要素 - HTML: ハイパーテキストマークアップ言語 | MDN