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W3C: "Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections." · Issue #6 · markdown-it/markdown-it-footnote · GitHub
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validator warnings: Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections. · Issue #1678 · w3c/aria-practices · GitHub
HTML Standard
Warning: Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections.
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