Why it matters
Small targets are hard to hit for people with motor impairments and for everyone on a phone (WCAG 2.5.8 requires 24×24 CSS px; 44px is the comfortable size).
How to fix it
Give icon buttons and links at least 24px (ideally 44px) of hit area with padding, or extend the hit area with a pseudo-element.
Example
.icon-btn { min-width: 44px; min-height: 44px; display: inline-grid; place-items: center; }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.
link-in-text-blockLinks in text are distinguished only by colorautocomplete-validInvalid autocomplete valuemeta-viewportZooming is disabledbypassNo way to skip repeated contentvideo-captionVideo has no captionsaxe-otherOther axe-core accessibility violationfocus-not-visibleKeyboard focus is not visiblereflow-overflowContent overflows horizontally at 320px