Unverified60% confidenceFactExact time
@starting-style is a new at-rule introduced in the CSS Transitions Level 2 specification, used to define the initial styles of an element as it transitions from non-existence to being displayed.
2
Sources
60%
Confidence
Long-term
Relevance
7/11/2026
First Seen
Sources
Pure CSS Popovers: A Native Approach Without JavaScript
youtubeKevin Powell7/1/2026
Related Claims
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