.clearfix {
&:before {
content: '';
}
}```
等于
.clearfix:before {
content: '';
}
`&::after`同理
.clearfix {
&:before {
content: '';
}
}```
等于
.clearfix:before {
content: '';
}
`&::after`同理本文标题：CSS 父元素 &
本文链接：https://www.haomeiwen.com/subject/yryccxtx.html
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