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伪元素的本质
.one——类选择器
:hover——伪类选择器
::after——伪元素选择器
类选择器 伪类选择器 就是选取对象
伪元素选择器 本质上是插入一个元素(标签 盒子) 只不过是行内元素
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原文地址:https://www.cnblogs.com/ahao214/p/11838914.html
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