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See http://lists.w3.org/Archives/Public/public-whatwg-archive/2014Feb/0039.html The HTML spec should state that the MathML <annotation-xml encoding="text/html"> element when used within an HTML document must only contain flow content.
Checked in as WHATWG revision r8465. Check-in comment: Allow HTML content in certain places in MathML http://html5.org/tools/web-apps-tracker?from=8464&to=8465