Accessibility: Use Headings to Show Hierarchical Relationships of Content

Please show me a reference to who said to use only one <h1> tag

I can show you a reference to contrast this rule.
Article from 2013 on h1 tags in the HTML5 era

Feedback appreciated.

Welcome back @KerryRuddock.
While the title of this topic references accessibility, the article you linked focuses on SEO (search engine optimization).

Regarding accessibility, if code with multiple h1 elements is run through a W3C validator it will get a warning to consider doing it a different way because some browsers and/or screen readers may handle this type of setup in a way you don’t expect.
So yes, it’s okay to do it with regards to both accessibility and SEO but not really recommended from an accessibility view point.

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