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Created attachment 1340 [details] testcase See the attached file at lines 71 and 73. You can see that the TR tag and the THEAD tags don't close. Still the validator says the document is valid HTML. Snippet: <table class="table table-hover"> <thead> <tr><th colspan=3></th></tr> <tr> <th><abbr title="Nominative">Nom.</abbr></th> <th><abbr title="Accusative">Acc.</abbr></th> <th><abbr title="Dative">Dat.</abbr></th> </table>
The end tags of THEAD and TR are optional. http://www.w3.org/html/wg/drafts/html/master/syntax.html#optional-tags http://www.w3.org/TR/html401/index/elements.html