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html-resource-hints

Use when reviewing templates, rendered HTML, or shared components related to Add resource hints (preload, prefetch, dns-prefetch). Validate the final browser-facing markup, not just the source framework abstraction.

skills/html-resource-hints/SKILL.md

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Repository stars (not skill ratings): 74,675
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frontend Repository topic
front-end-development Repository topic
front-end-developer-tool Repository topic
guidelines Repository topic
checklist Repository topic
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 · 2,109 bytes
SKILL.mdcore · 2,109 bytes
references/rule.mddoc · 4,234 bytes

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# Add resource hints (preload, prefetch, dns-prefetch)

The browser's HTML parser discovers resources sequentially — a font referenced in a CSS file won't be fetched until the CSS is parsed. Resource hints break this dependency chain, allowing the browser to start fetching critical resources in parallel with parsing. A single preload directive for a critical font can eliminate a 100–300ms Flash of Invisible Text.

## Quick Reference

- preload forces immediate download of resources needed by the current page
- prefetch fetches resources likely needed for the next navigation (low priority)
- dns-prefetch resolves DNS for third-party origins in advance
- preconnect does DNS + TCP + TLS for origins you'll connect to soon

## Check

Look at this HTML file for late-discovered critical resources — fonts referenced in CSS, hero images, and key scripts. Identify where preload or preconnect hints would help.