Unverified50% confidenceSolutionExact time
::backdrop伪元素是顶层机制的配套产物，自动生成覆盖整个视口的遮罩层，需单独配置过渡规则才能参与动画
1
Sources
50%
Confidence
Long-term
Relevance
8/12/2026
First Seen
Sources
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