Posts tagged #javascript

Svelte 5.36 lets you use await at the top level of a component, inside $derived, and in your markup. Here is how synchronized updates, boundaries, and $effect.pending() fit together.

Your app already runs in five tabs at once, and they all think they are in charge. The Web Locks API gives the browser a real mutex so only one of them does the work.

Custom elements can be real form controls. Here is how formAssociated, ElementInternals, and setValidity retire the hidden-input hack for good.

Next.js 16.3 stops firing a prefetch request for every link in the viewport and caches one reusable loading shell per route instead. Here's what changes and how to turn it on.

Chrome 148 ships experimental support for filling HTML placeholders out of order and streaming markup into the DOM. Here's how the new template-for and streamHTML APIs work, and what they replace.

React 19.2's Activity component hides a subtree instead of unmounting it, so state, scroll position, and DOM survive the round trip. Here's how it behaves, what it does to your Effects, and where it costs you.

Next.js 16 gave cache invalidation two different functions instead of one, and the split maps to a real distinction: content that can lag versus content the user just typed.

Firefox 148 shipped Trusted Types in February 2026, making it Baseline. Here's how to turn every dangerous innerHTML assignment in your app into a TypeError you can actually catch.

Your field data says INP is 400ms. Your local profile says everything is fine. The Long Animation Frames API closes that gap by naming the script, the function, and the character position that stalled the frame.