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【Q339】伪类与伪元素有什么区别 #342

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shfshanyue opened this issue Jun 10, 2020 · 1 comment

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shfshanyue commented Jun 10, 2020

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shfshanyue added the css label

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shfshanyue commented Jul 19, 2020 •

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伪类使用单冒号，而伪元素使用双冒号。如 :hover 是伪类，::before 是伪元素
伪元素会在文档流生成一个新的元素，并且可以使用 content 属性设置内容

参考 https://www.w3.org/TR/CSS2/selector.html#pseudo-elements

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