Unverified50% confidenceFactExact time
transition-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
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
Related Claims
Unverified将transition-behavior设置为allow-discrete可以允许浏览器对离散属性（如display）进行过渡处理75% similarUnverifiedCSS 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73% 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71% similarUnverifiedCSS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%71% similarUnverified@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69% similar
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