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Did you catch that? I changed <h2> element to an <h1>. But…but…but… shouldn’t you only have one <h1> per document? Won’t this screw up the document outline? No, and here’s why. In HTML 4, the only way to create a document outline was with the <h1>–<h6> elements. If you only wanted one root node in your outline, you had to limit yourself to one <h1> in your markup. But the HTML5 specification defines an algorithm for generating a document outline that incorporates the new semantic elements in HTML5. The algorithm says that an <article> element creates a new section (i.e. a new node in the document outline). And in HTML5, each section can have its own <h1> element.

To be HTML5 compliant, a best practice SEO standard of only one H1 per page would be broken - more markup around sections such as <article> means each section can have its on H1-6 structure, <hgroup>, meaning multiple H1's