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currently the th [1] element when being used a col or row header can be overidden by any role, suggest constraining roles when element has scope/headers/sorted/abbr attributes. [1] http://www.w3.org/html/wg/drafts/html/master/tabular-data.html#the-th-element
moved bug to aria module https://github.com/webspecs/html-aria/issues/19