HTML streaming allows servers to send HTML progressively rather than in one chunk, enabling browsers to render content as it arrives. HTMS is an experimental project that extends basic streaming with progressive placeholders that can be updated asynchronously within a single HTTP response. This approach delivers early First

14m read timeFrom calendar.perfplanet.com
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Table of contents
IntroductionContext: modern performance problemsRediscovering HTML streamingFrom a Rust proof of concept to a JavaScript experimentProgressive placeholders and streamed updatesExample: building a product page with HTMSPerformance results and Lighthouse metricsNote on HTTP streaming and compressionSEO and accessibility considerationsTrade-offs and limitationsConclusion
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