Schedule work at the right time with queueMicrotask() âs Run a callback after the current task but before rendering. More predictable than setTimeout...

   Format lists like a native speaker Intl.ListFormat turns arrays into grammatically correct strings in any locale. Handles "and",...

   Fit images perfectly with object-fit Control how replaced content (images, videos) fills its container. cover, contain, fill, scale-down, or none.No...

   Parse and build query strings the easy way URLSearchParams gives you a clean API for working with URL parameters. Get, set, append, delete, and...

   Happening tomorrow at Mozilla Berlin s Firefox, open source & the future of the web. Firefox Mobile open source contributions Firefox Roadmap...

   Support dark mode with one CSS property color-scheme tells the browser your page supports light, dark, or both. Form controls, scrollbars, and system...

   Send messages between browser tabs instantly BroadcastChannel lets same-origin tabs, iframes, and workers communicate in real time. Great for syncing...

   Server-render Shadow DOM with declarative syntax ✠Use <template shadowrootmode "open"> to create shadow roots in HTML. No...

   Control how web fonts load with font-display Avoid invisible text (FOIT) or flashes of unstyled text (FOUT) by telling the browser exactly how to...

   Mozilla Meetup is back in Berlin Apr 28 18:00Firefox, open source & the future of the web. Firefox Mobile open source contributions Firefox...

   Coordinate async tasks with the Web Locks API Prevent race conditions across tabs and workers. Request a named lock, and the browser ensures...

   Transform iterators without converting to arrays Iterator helpers like .map(), .filter(), .take(), and .drop() work lazily on any iterable. Process...

   Help us build the WebAssembly language reference on MDN We're documenting Wasm 1.0 instructions, reference-types, and SIMD, and looking for...

   Firefox 150 is here What's new? color-mix() accepts multiple colors New :playing, :paused, :muted media pseudo-classes œ animation-range-start...

   Set operations are native in JavaScript union(), intersection(), difference(), symmetricDifference() no more manual loops for set math.> const a...

   RE: https: social.eqrion.net ryan 116448930933122446Want to help make Wasm more accessible?Come join us âœ

   Responsive values without media queries clamp() sets a minimum, preferred, and maximum value in one function. Perfect for fluid typography and...

   Transform key-value pairs back into objects Object.fromEntries() is the inverse of Object.entries(). Convert Maps, arrays, or URLSearchParams...

   Use gap in flexbox, no more margin hacks The gap property works in flexbox, grid, and multi-column layouts. Set consistent spacing between items...

   Read and build form data with the FormData API Construct form submissions programmatically, including file uploads. Works with fetch() for modern...