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神奇的选择器 :focus-within
source link: https://juejin.im/post/5b62839d6fb9a04fd260af17
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CSS 的伪类选择器和伪元素选择器，让 CSS 有了更为强大的功能。 伪类大家听的多了，伪元素可能听到的不是那么频繁，其实 CSS 对这两个是有区分的。 有个错误有必要每次讲到伪类都提一下，有时你会发现伪类元素使用了两个冒号 (::) 而不是一个冒号 (:
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