It turns out it is not easy so early in HTML 5 history, but after looking http://www.google.com.tw/search?q=validate+HTML5&ie=utf-8&oe=utf-8 I finally found http://www.w3.org/QA/2008/08/html5-validator-beta an HTML 5 validator http://qa-dev.w3.org/wmvs/HEAD/ and proceeded to find genuine invalid MediaWiki HTML 5 invalidities http://qa-dev.w3.org/wmvs/HEAD/check?uri=http://transgender-taiwan.org/&charset=(detect+automatically)&doctype=Inline&group=0
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