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从青铜到王者10个css3伪类使用技巧和运用，了解一哈
source link: https://juejin.im/post/5b6d0c5cf265da0f504a837f
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写在前面伪类经常与伪元素混淆，伪元素的效果类似于通过添加一个实际的元素才能达到，而伪类的效果类似于通过添加一个实际的类来达到。实际上css3为了区分两者，已经明确规定了伪类用一个冒号来表示，而伪元素则用两个冒号来表示。伪类与伪元素的本质区别就是是否抽象创造了新
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