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Aswell as checking the charset of the content, it would be useful if the content type of the document was also checked to ensure that the mime-type was appropriate, and even recommended, e.g. SVG is served as image/svg+xml (or other appropriate mime type) over application/octetstream or even application/xhtml, and XHTML 1.1 isn't served as text/html. It would also be good of some parts of Appendix C. could be checked for XHTML 1.0 as text/html, and a low key warning would also be good here suggesting application/xhtml+xml. SVG is very commonly got wrong, and is actually one of the most frequently asked questioned in the SVG world, similar confusion abounds in the XHTML world.
There's features planned along this line for either 0.7 or the following version.
*** Bug 61 has been marked as a duplicate of this bug. ***
Won't make it for 0.7.0.
Done, see: http://qa-dev.w3.org/wmvs/HEAD/dev/tests/#wrong_mime