::before和::after僞元素的用法

時間 2020-12-25

原文原文鏈接

一、介紹 css3爲了區分僞類和僞元素，僞元素採用雙冒號寫法。常見僞類——:hover,:link,:active,:target,:not(),:focus。常見僞元素——::first-letter,::first-line,::before,::after,::selection。 ::before和::after下特有的content，用於在css渲染中向元素邏輯上的頭部或尾部添加內容

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1. ::before和::after僞元素的用法
2. HTML：::before和::after僞元素的用法
3. ::before 和 ::after 僞元素的用法
4. CSS 的::before 和 ::after 僞元素用法
5. 僞元素 before after
6. 僞元素::after和::before
7. before和：after僞元素
8. ::before 和 ::after 僞元素
9. CSS ::before 和 ::after 僞元素用法
10. css before和after僞元素應用
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