Delayed Tooltip
A quick mouse-over shouldn't trigger a tooltip flash. This one waits 600ms before appearing on hover (and instantly on keyboard focus), then hides immediately on exit. Pure CSS — no timers in JavaScript.
This tooltip waits 600ms before appearing
Show delay
600ms via transition-delay on the reveal state.
Hide behavior
The :not(:hover) rule resets the delay to 0ms so it vanishes instantly.