Reference index / 컨트롤 상호작용 상태
Focus State
The state identifying the element currently designated to receive keyboard or other input.
When to use it
Tab navigation and input location.
Caveats and distinctions
Focus is not the same as selection; the two states can exist independently.
Implementation and classification
아이콘·상태 표시 / 컨트롤 상호작용 상태
Sources and verification status
https://www.w3.org/WAI/ARIA/apg/practices/keyboard-interface/
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