Focus indicator
The visible outline or highlight that shows which element the keyboard is on.
When a person moves through a page with the Tab key, the focus indicator shows where they are: an outline around the link or button that will respond to Enter. Browsers draw one by default. Teams sometimes remove it because they dislike the look, and someone using a keyboard then loses their place on the page.
WCAG requires that focus be visible, and WCAG 2.2 adds that the focused element must not be entirely hidden behind sticky headers or other content. The fix is to design a focus style you like rather than removing the default: a thick outline in a brand color with enough contrast against every background. The W3C’s Easy Checks include tabbing through a page to see whether focus is visible.
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