Unverified50% confidenceFactExact time
The CSS overlay property itself produces no visual effect; rather, it tells the browser that the element participates in a top-layer animation: when the element is about to leave the top layer, the browser delays its removal from the top layer until the transition ends, allowing the exit animation to play in full.
1
Sources
50%
Confidence
Long-term
Relevance
10/20/2026
First Seen
Sources
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