Headings used to represent a headings for sections. It should not contain any block-level elements; though, since it is block-level, it may contain inline elements. <h1> is the most prominent, e,g, likely representing a page heading, while <h6> will likely be a very minor section (I rarely go below <h4>). Use headings to mark different sections and subsections, where a subsection would have lower (h1 is the highest, then h2...) heading than the whole.
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