Individual skill
speculation-rules
Use when optimising multi-page navigation performance, reducing INP on page transitions, or implementing progressive enhancement for fast page loads.
skills/speculation-rules/SKILL.md
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- Last checked
- Nov 9, 2026
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- frontend Repository topic
- front-end-development Repository topic
- front-end-developer-tool Repository topic
- guidelines Repository topic
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- reference Repository topic
- web-development Repository topic
- html Repository topic
- css Repository topic
- javascript Repository topic
- engineering Derived category
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SKILL.mdcore · 2,037 bytesreferences/rule.mddoc · 7,367 bytes
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# Use the Speculation Rules API to prefetch and prerender navigations
Navigation latency is one of the biggest contributors to poor Interaction to Next Paint (INP) and overall perceived performance. Prerendering the most likely next page eliminates all network and rendering latency — the user sees the new page in under 100 ms regardless of server response time. Google Search has used this API to deliver its "instant" results page experience.
## Quick Reference
- Use prefetch rules to load the next page's HTML ahead of time
- Use prerender rules to fully render the next page in the background (instant navigation)
- Scope rules with href-matches or CSS selector patterns to avoid wasting bandwidth
- Prefer document rules (CSS selectors) over URL list rules for dynamic sites
## Check
Check whether the site uses the Speculation Rules API or equivalent prefetch/prerender techniques for likely navigation targets.