Why it matters
Screen-reader users commonly jump to the h1 to find the start of the content; search engines use it too.
How to fix it
Add exactly one <h1> describing the page.
References
More accessibility rules
void a11y reports 48 rules in this category. WCAG 2.2 AA through axe-core, plus checks axe can't do alone: visible keyboard focus, 24/44px target size on mobile, 320px reflow and disabled zoom.
document-titlePage has no <title>landmark-one-mainPage has no <main> landmarkregionContent is outside landmark regionslandmark-uniqueLandmarks are not uniquely identifiableheading-orderHeading levels skipempty-headingHeading is emptylistList contains invalid childrenlistitem<li> is not inside a list