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streaming-html

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Use when reviewing server-side rendering setup, Next.js App Router pages, or Node.js HTTP handlers to verify that HTML is streamed incrementally rather than buffered until completion.

skills/streaming-html/SKILL.md

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# Stream HTML to the browser before the full response is ready

Traditional SSR waits for all data fetches to complete before sending a single byte of HTML, which means the browser cannot parse, discover subresources, or render anything until the slowest data query finishes. Streaming decouples the delivery of above-fold content from slow database queries and third-party API calls, dramatically improving perceived performance and LCP.

## Quick Reference

- Streaming sends HTML in chunks as it is generated instead of waiting for the full response
- React renderToPipeableStream and Next.js App Router stream by default when you use Suspense
- Place Suspense boundaries around slow data dependencies to flush above-fold HTML immediately
- Monitor TTFB in Lighthouse — values above 600ms are a sign that streaming is not being used

## Check

Examine this server-side rendering implementation to determine whether HTML is streamed in chunks or buffered until fully generated before sending to the client.
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