markup-validator
https://github.com/w3c/markup-validator
HTML
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- Issues
- warning: failed to load external entity "http://www.w3.org/TR/MathML2/dtd/isonum.ent"
- https://validator.w3.org/check?uri=referer no longer (?) checking actual referer, but my homepage
- Error 404
- html custom-elements broken in head section.
- SVG should not require <style type>
- `check/referer` gives confusing results due to more default restrictive referer policies in browsers
- <main> and role="main"
- Sanitise input URI; specifically, discard e-mail addresses
- Docs
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