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The HTML5 spec currently states the following advice [1]: "Sections may contain headings of any rank, but authors are strongly encouraged to either use only h1 elements" Given that this advice is predicated on the implementation of the outline algorithm in browsers which has not occured and by all anecdotal indications this is unlikely to happen soon if at all, I suggest that it is not appropriate to include this advice in the spec. [1] http://dev.w3.org/html5/spec/headings-and-sections.html#headings-and-sections
*** This bug has been marked as a duplicate of bug 19741 ***