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Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/rendering.html Multipage: http://www.whatwg.org/C#sections-and-headings Complete: http://www.whatwg.org/c#sections-and-headings Comment: if, and only if, an author uses H1 exclusivly couldn't the 'x' also represent H1 Posted from: 95.8.29.71 User agent: Mozilla/5.0 (Windows NT 6.1; rv:6.0) Gecko/20100101 Firefox/6.0
No; h1s don't nest. If an author used only sections, it could be section.