Heading Outline
Extract the heading structure (H1–H6) from a block of HTML as an indented outline, and warn if there isn't exactly one H1 — a common SEO issue.
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Worked example
H1 · Main Title
H2 · Section One
H3 · Detail
H2 · Section Two
Frequently asked
Why only one H1?
One clear H1 per page helps search engines and screen readers understand the main topic.
Does it read live pages?
No — paste the HTML source you want to inspect.