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For XML documents, the NU valdiator allows the user to apply an HTML5 preset. This is fine. However, doing so means that some features that aren't conforming XHTML5, are accepted as conforming. For instance, the <noscript> elememt- Example: http://tinyurl.com/bfwfjwf To solve this issue, the validator should issue a warning to user that the XHTML document was validated with a HTML preset. To issue such a warning would be in style with the "Be lax about content-type", which causes a warning to be issued saying that the MIME type is supressed.