Full H1 to H6 outline, with multiple-H1 and skipped-level warnings.
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Headings are the outline of your page. They tell readers what is where, they tell screen readers how to navigate, and they are the chunks AI answer engines lift when quoting a source. A page with six H1s and no H2s has no outline at all.
HTML5 permits it and Google tolerates it. It still dilutes the signal about what the page is primarily about, and most multiple-H1 pages got that way by accident through a page builder.
Mildly for search engines, considerably for accessibility. Screen-reader users navigate by heading level, and a broken hierarchy makes a page hard to move through.
They should describe the section accurately. If that naturally includes the keyword, good. Writing headings backwards from a keyword list produces the stilted subheadings that read as machine-written.
Rarely, beyond keeping the outline coherent. Most pages need no more than H2 and H3.
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