Elements in sequential focus order must have a visible focus indicator
keyboard-accessible/focus-visible · WCAG 2.4.7 · Level AA
Elements in sequential focus order must have a visible focus indicator.
Keyboard users need to see which element has focus. Do not remove the default focus outline (outline: none) without providing an alternative visible indicator. Use :focus-visible or :focus styles to ensure focus is always perceivable.
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Introduced in @accesslint/core v0.8.0