markup-validator
https://github.com/w3c/markup-validator
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- Issues
- Native checkbox within ARIA checkbox passes validator
- ARIA radio within ARIA radio passes validator
- ARIA checkbox within ARIA checkbox passes validator #73
- Native radio within ARIA radio passes validator
- https://validator.w3.org/check?uri=referer checks random page totally unrelated to the actual referring page
- warning: failed to load external entity "http://www.w3.org/TR/MathML2/dtd/isonum.ent"
- Wrong unicode domain name decoding
- https://validator.w3.org/check?uri=referer no longer (?) checking actual referer, but my homepage
- HTML snippet for "valid" Icon(s) on your Web page
- Error 404
- Docs
- HTML not yet supported