markup-validator
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w3c
Native radio within ARIA radio passes validator: ``` ```
ARIA checkbox within ARIA checkbox passes validator: ``` ```
ARIA radio within ARIA radio passes validator. ``` ```
This passes in the validator (example found in the wild) ``` ```
Using the [direct input](https://validator.w3.org/#validate_by_input) validation form, this snippet ``` ``` is validated as xml and passes. But the same extract, when saved as a file and submitted to the [validation...
I'm not sure whether this is the right place for the report, but the RSS feed validator at https://validator.w3.org/feed/ is now returning HTTP 503 Service Unavailable. It was working a...
Each time I do use ths namespace for podcasting, I get this feedback from the validator. 
Not sure if this is the correct place to report the issue, just found out some mistakes in this [page ](https://www.w3.org/TR/WCAG22/#new-features-in-wcag-2-2) The number below was incorrect. - 3.3.7 [Accessible Authentication](https://www.w3.org/TR/WCAG22/#accessible-authentication)...
When using https://validator.w3.org/ to validate MathML - by setting the document type to Mathml 2.0 - the example from https://www.w3.org/TR/mathml-core/#attributes-common-to-html-and-mathml-elements does not validate; the attribute "dir" is not recognized: `there...
Validating an HTML4 document https://gsarchive.net/backups/_html_perf_grps_websites_gb.html produces error messages reporting "there is no attribute X" for many attributes which are better handled by CSS. (Interestingly, validating the exact same content via...
