markup-validator
https://github.com/w3c/markup-validator
HTML
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- Issues
- color-mix() examples not W3C compliant
- Entering Google domain opens the website
- Wrong link for error document validation
- Check refused in Validator but possible in nuHTML
- Validator connection rejected because of libwwww
- Allow new attributes: popover, popovertarget and popovertargetaction
- Docs: Source IP-Range not up-to-date
- False-negative for role="graphics-symbol img"
- inconsistent validation of svg
- RSS feed validator has gone missing
- Docs
- HTML not yet supported