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"A general rule is that the article element is appropriate only if the element's contents would be listed explicitly in the document's outline." "The theme of each article should be identified, typically by including a heading (h1-h6 element) as a child of the article element." http://www.w3.org/html/wg/drafts/html/master/sections.html#the-article-element
see commit https://github.com/w3c/html/commit/9f82c509007e41826377ccda060dc5c8e8c123c9 leaving bug open for discussion
The two sentences in teh bug description have been added