Rendering
Hydration
The process of attaching JavaScript event listeners to server-rendered HTML in the browser.
Definition
After server-rendered HTML arrives in the browser, the JavaScript framework "hydrates" it — running again on the client to attach event handlers and reactive state. Hydration mismatches (server HTML differs from client render) cause warnings and can change canonical tags or page metadata after first paint, which crawlers may or may not see.
See also
More in Rendering
Prerendering
Generating static HTML snapshots of JavaScript-rendered routes for crawlers and (sometimes) users.
Server-Side Rendering (SSR)
Generating HTML on the server for every request, then sending it to the browser.
Static Site Generation (SSG)
Building every page as static HTML at build time and serving from a CDN.
Incremental Static Regeneration (ISR)
A hybrid where pages are static-served from cache but regenerated on demand or on a TTL.
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