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                ## **::before 和 :after中雙冒號和單冒號有什么區別?** 1. 單冒號(:)用于CSS3偽類,雙冒號(::)用于CSS3偽元素。 2. ::before就是以一個子元素的存在,定義在元素主體內容之前的一個偽元素。并不存在于dom之中,只存在在頁面之中。
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