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ReactAdvanced#ssr

What is hydration?

The process where React attaches event listeners and state to server-rendered HTML instead of recreating it. If the client render differs from the server HTML you get a hydration mismatch warning.

Example
// mismatch: server has no window
const v = typeof window !== 'undefined' ? localStorage.theme : 'light';
// fix: read it inside useEffect after mount

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