Individual skill
w3c-compliant
Use when reviewing templates, rendered HTML, or shared components related to Validate HTML against W3C standards. Validate the final browser-facing markup, not just the source framework abstraction.
skills/w3c-compliant/SKILL.md
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- Last checked
- Nov 9, 2026
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- Repository stars (not skill ratings)
- 74,709
- Repository last updated
- Oct 31, 2026
- License
- MIT
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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 · 1,681 bytesSKILL.mdcore · 1,681 bytesreferences/rule.mddoc · 15,811 bytes
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# Validate HTML against W3C standards
Invalid HTML causes unpredictable rendering across browsers, breaks accessibility tools, and makes debugging significantly harder.
## Quick Reference
- Use validator.w3.org or browser extensions for validation
- Fix errors first, then warnings (errors cause rendering issues)
- Integrate validation into CI/CD with html-validate
- Common issues: unclosed tags, invalid nesting, missing attributes
## Check
Validate HTML markup using the W3C HTML Validator to identify and fix markup errors that could cause cross-browser compatibility issues.