Headings mark up the outline of a page. The H1 states the main topic, H2s mark major sections and H3 to H6 nest below them.
Common issues are missing H1s, multiple competing H1s, empty headings and skipped levels.
Clear headings help readers scan, help assistive technology navigate and help search engines and AI systems understand which passage answers which question.
VisibilityKit Crawler audits headings on every page and flags missing or duplicate H1s and other heading problems.
It is valid HTML, but one clear H1 is still the simplest signal of the main topic.
They should agree on the topic. They do not have to be identical.
The HTML element that sets a page's title, shown in browser tabs and usually as the headline in search results.
Content specifically structured and written to be easily discoverable, processable, and citable by AI platforms.
A measure of how likely a piece of content is to be cited by AI platforms in their generated responses.
A systematic check of a website's crawlability, indexability, links, redirects and on-page elements.
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