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The idea that you could use
<h1>
for a generic heading across your documents, and the browser would “know” which level it actually should be by its nesting inside<section>
and other related “sectioning elements”, is no more. @brucel explains why: brucelawson.co.uk/2022/why-the-html-outlining-algorithm-was-removed-from-the-spec-the-truth-will-shock-you/ 😯