Unverified50% confidenceFactExact time
CSS transition在设计上只支持可插值属性，display和visibility等离散属性传统上无法参与过渡
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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UnverifiedCSS规范定义离散属性在过渡中的插值行为为：动画进度0%到49.9%时保持起始值，50%时跳变为终止值；但display: none的跳变被延迟到100%74% similarUnverifiedtransition-behavior: allow-discrete是CSS Transitions Level 2提出的解决方案，允许离散属性在过渡结束的最后一帧才切换73% similarUnverifiedCSS的设计原则是遇到不认识的属性或值时静默忽略并继续解析，而非像编程语言那样报错72% similarUnverified离散属性的默认插值规则是在过渡的50%之后跳变，这一行为在CSS规范中被定义69% similarUnverifiedCSS视觉渲染与DOM实际内容之间存在分离特性，字符可通过白底白字、font-size:0或opacity:0在视觉上不可见但仍存在于HTML文档中，复制粘贴会带走69% similar
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