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                ``` <style> .parent{ width:400px; height: 300px; background: khaki; } .child{ margin-top:100px; width: 100px; height: 100px; background: lawngreen; } /* :before某個元素里面的最前面 */ .parent::before{ content: ""; display: table; } </style> ``` > 子元素作為父元素的第一個元素,給它margin-top沒用,它的父元素變動 偽元素是在某個元素里面的最前面或者最后面 ``` <body> <div class="parent"> <div class="child"></div> </div> </body> ```
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