Posts tagged #javascript — Page 2

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…

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.

Chrome 148 ships experimental support for filling HTML placeholders out of order and streaming markup into the DOM.

React 19.2's Activity component hides a subtree instead of unmounting it, so state, scroll position, and DOM survive the round trip.

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…

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…

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…

The browser can now strip XSS from an HTML string during parsing. Here's how setHTML works, why its config can only narrow the allowlist, and how to ship it…