React / update detail

19.3.0 (September 9, 2026)

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React·Sep 9, 2026, 06:01 PMFixSecurity-relevantAI-assisted summary

Summary

- Add <ViewTransition/> with addTransitionType API, support refs on <Fragment/>, and introduce browser() API for client‑only rendering in Suspense boundaries.
- Integrate Trusted Types, make transitions render independently, and enhance server‑side features (nonce on import maps, robust abort handling, Flight protocol improvements).
- Fix a wide range of bugs: Fast Refresh stability, Performance Track edge cases, Activity/Offscreen behavior, form event handling, module preload tracking, and SSR/Deno issues.

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Official source Last checked Sep 19, 2026, 7:02 PM

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