Confirm that the focus indicator does not disappear prematurely (e.g., due to CSS animations) and is not covered by overlapping elements.
Disappearing focus indicator:
This button has a focus indicator that disappears after 2 seconds:
Note: Impossible to automatically test/detect. Requires a human tester or AI to visually verify that focus indicators:
a) Do not disappear prematurely
b) Are not covered by overlapping elements
Neither of these can be checked automatically, as they require visual analysis, or an understanding of what is "adequate" focus persistence.