Why it matters
user-scalable=no or maximum-scale < 2 stops low-vision users from pinch-zooming (WCAG 1.4.4).
How to fix it
Remove user-scalable=no and maximum-scale from the viewport meta.
Example
<meta name="viewport" content="width=device-width, initial-scale=1">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.
tabindexPositive tabindexscrollable-region-focusableScrollable region is not keyboard accessiblelink-in-text-blockLinks in text are distinguished only by colorautocomplete-validInvalid autocomplete valuebypassNo way to skip repeated contentvideo-captionVideo has no captionsaxe-otherOther axe-core accessibility violationtarget-sizeTouch target is smaller than 24×24 px