React 19.3 Officially Releases with Stable View Transitions and Fragment Refs

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React 19.3 was published to npm on September 9, 2026, promoting two long-experimental features — View Transitions and Fragment Refs — to stable status. View Transitions allow React to automatically animate elements as they appear, disappear, or move during state updates wrapped in startTransition. Fragment Refs introduce a FragmentInstance handle that lets developers attach ref-like behaviour to a group of sibling elements without needing a wrapper DOM node. The release also adds a new browser() utility to skip server-side rendering for components that rely on browser-only APIs, along with Trusted Types support for improved DOM injection security and native Context access inside Server Components. Several smaller bug fixes covering fullscreen events, form handling, focus behaviour, and independent transitions are also bundled in the update.

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