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XHTML5 web sites are being validated as "HTML5" instead of "XHTML5". The validator is treating these XHTML pages as XHTML5 internally, but is giving the success message as "HTML5" instead of "XHTML5". Like Sam's site: http://qa-dev.w3.org/wmvs/HEAD/check?uri=http%3A%2F%2Fintertwingly.net%2Fblog%2F&charset=(detect+automatically)&doctype=Inline&group=0&user-agent=W3C_Validator%2F1.630 Such sites should be given a success message something like: "valid XHTML5".
There are no current plans to change the message for this case.