GeezerVison

…8597)

* Document browser-only rendering

Add the Canary browser API reference, including optional lazy reasons, server bailout reporting, fatal and abort behavior, navigation entries, and onBrowserBailout options for every streaming, resume, and prerender API that supports it.

* Polish browser API docs and add live example

* Document browser with use and Suspense

---------

Co-authored-by: Aurora Scharff <[email protected]>

* Clarify browser-only rendering guidance

* Polish browser-only guidance wording

* Use Canary markers in browser guidance

* Present browser as a use resource

* Polish browser usage labels

* Address browser guidance review

* Clarify browser return value is opaque

* Restore alternative wording

* Restore hydration alternative wording

* Focus use introduction on resources

* Note stable browser cleanup

* Pin matching React Canary versions in Sandpack demos

* Use cached Canary build in Sandpack demos

* Improve browser-only rendering example

* Clarify browser-only example action

* Show browser-only fallback on reload

* Add conditional browser query example

* Move browser query hook into its own example file

* Use IndexedDB in conditional browser example

* Clarify conditional browser rendering example

* Polish browser rendering examples

* Bridge conditional browser examples

* Tighten conditional browser example intro

* Use time zone for conditional browser example

* Clarify conditional example transition

* Lead conditional browser docs with time zone example

* Address conditional browser rendering feedback

* update

* Clarify conditional browser control flow

* Clarify conditional data fetching pattern

* Clarify conditional rendering outcomes

* Polish conditional browser examples

* Clarify conditional query rendering

* Align conditional browser guidance

…632)

* Document missing Fizz server rendering options and fix resume references

This adds the `formState`, `importMap`, `onHeaders`, and `maxHeadersLength` options to the `renderToPipeableStream` and `renderToReadableStream` reference pages, documents the object form of `nonce` for separate script and style nonces, and adds `importMap`, `onHeaders`, and `maxHeadersLength` to the `prerender` and `prerenderToNodeStream` pages. All of these options are supported in stable releases but were never documented. The `resumeAndPrerender` entries on the `react-dom/static` index were marked as experimental-only even though they ship in stable releases, so the badge is removed, and the `resumeAndPrerender` intro destructured a `postpone` property that is actually called `postponed`.

The `resumeToPipeableStream` page no longer documents a `signal` option because the Node.js implementation neither types nor reads it, and it now documents the `onAllReady` callback that the implementation does support. The same page referred to `resume` in its intro and Returns section where it meant `resumeToPipeableStream`, and the `react-dom/server` index linked both resume entries to the `renderToPipeableStream` page; they now point at their own pages.

Co-Authored-By: Claude Code (kimi-k3[1m]) <[email protected]>

* Document the formState option for hydrateRoot

This adds the `formState` option to the `hydrateRoot` reference. The option carries the form state produced by a Server Function form submission so that `useActionState` with a `permalink` returns the submitted state during hydration instead of the initial state, and it must match the `formState` passed to the server renderer. The option shipped in React 19.0 but was never documented.

---------

Co-authored-by: Claude Code (kimi-k3[1m]) <[email protected]>

* Validate inline code highlights in docs

* Match MDX code highlight metadata parsing

* Clarify standalone startTransition error handling

* Polish startTransition error handling docs

* Describe startTransition differences neutrally

* Clarify startTransition callback wording

* Remove repeated startTransition caveat

* Preserve existing startTransition guidance

* Preserve useTransition error guidance

* Update src/content/reference/react/useTransition.md

Co-authored-by: Sebastian "Sebbie" Silbermann <[email protected]>

* Clarify standalone startTransition error reporting

---------

Co-authored-by: Sebastian "Sebbie" Silbermann <[email protected]>

* Update browser.md

* Update browser.md

* Add React Advanced London 2026 and React Summit US 2026

Co-Authored-By: Claude Fable 5 <[email protected]>

* Retrigger CI

* Add React Day Berlin 2026, React Summit Asia 2027 and React Summit 2027

* Fix React Summit Asia 2027 dates

* Add LinkedIn links for React Summit and React Day Berlin

* Remove extra blank line between conference entries

---------

Co-authored-by: Claude Fable 5 <[email protected]>

* Document React-specific img behavior

* Explain empty image source caveat

…673)

Both became stable in React 19.3 and both have reference pages and
sidebar entries, but neither is listed on its overview page:

- `<ViewTransition>` is missing from Built-in React Components, which
  already lists its 19.3 sibling `<Activity>`.
- `addTransitionType` is missing from Built-in React APIs, which
  already lists `cache`, `cacheSignal` and `captureOwnerStack`.

CONTRIBUTING.md says the API Reference "is intended to be exhaustive",
so a reader browsing either overview page currently can't discover
either API.

Co-authored-by: Claude Opus 5 (1M context) <[email protected]>

* Clarify img View Transition example

* Avoid redundant image alt text

* Tighten img example introduction

* Move img example outcome below demo

* Clarify Suspense image example

* Simplify View Transition comparison examples

* Use a Suspense load in the image example

* Align Suspense resource loading examples

* Reduce View Transition example changes

* Remove artificial image loading delay

* Keep Suspense explanation self-contained

* Scope shared examples to each API

* Use Suspense for View Transition image example

* Make image loading comparison visible

* Tighten View Transition image examples

* Document View Transition resource timeout

* Cache image promises in Suspense examples

* Fix Suspense resource demos

* Clarify View Transition image reveal

* Fix Suspense font loading example

* Align image loading explanations

* Address image documentation review

* Simplify View Transition image guidance