markup-validator
https://github.com/w3c/markup-validator
HTML
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- Issues
- `rel` attribute should not allow `shortcut`
- Feedback: Unclear/inexact "Bug reports" section
- Validator rejects "oninput" in first "input"
- Incorrect URL in "valid HTML box"
- No "faq-flash" label in help page
- False positive for table semantics with ul/li
- Is the license in the README still accurate?
- color-mix() examples not W3C compliant
- Entering Google domain opens the website
- Wrong link for error document validation
- Docs
- HTML not yet supported