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z-index属性在什么情况下会失效?
2022-06-30 04:46:00 【前端同学】
通常 z-index 的使用是在有两个重叠的标签,在一定的情况下控制其中一个在另一个的上方或者下方出现。z-index值越大就越是在上层。z-index元素的position属性需要是relative,absolute或是fixed。
z-index属性在下列情况下会失效:
- 父元素position为relative时,子元素的z-index失效。解决:父元素position改为absolute或static;
- 元素没有设置position属性为非static属性。解决:设置该元素的position属性为relative,absolute或是fixed中的一种;
- 元素在设置z-index的同时还设置了float浮动。解决:float去除,改为display:inline-block;
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