Unverified50% confidenceFactExact time
@starting-style是CSS Transitions Level 2规范中引入的新at-rule，用于定义元素从不存在到显示时的初始样式
1
Sources
50%
Confidence
Long-term
Relevance
7/11/2026
First Seen
Sources
纯CSS实现Popover弹层：无需JavaScript的原生方案
youtubeKevin Powell7/1/2026
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