CSS经常使用伪类使用详解

首先伪类是用单冒号表示：如:link, :visited, :hover, :active, :focus, :first-child, :last-child, :nth-child, :nth-last-child, :not()html 而后伪元素用双冒号表示：如::first-letter, ::first-line, ::before, ::aftergoogle 1.用于连接的几个伪类

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