Server Rendering & Suspense, Hydration Improvement
summary
React 19 adds concrete server-rendering features: a precedence prop lets React order and dedupe stylesheets in the head, and React waits to reveal the nearest Suspense boundary until those styles load — described as suspense for CSS. It also hoists and deduplicates async scripts and exposes preloads usable during render and events. Hydration becomes more tolerant of extra head/body nodes and surfaces consolidated hydration errors that include diffs of mismatched props and elements.
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