双冒号（：:)是什么意思在CSS？ [英] What does the double colon (::) mean in CSS?

问题描述

在CSS中，双冒号（ :: ）是什么意思？

What does the double colon (::) mean in CSS?

例如：

input[type=text]::-ms-clear { display: none; }

推荐答案

>选择器。这意味着右侧的元素在正常DOM中不存在，但可以选择。

It means pseudo element selector. It means the element to the right doesn't exist in the normal DOM, but can be selected.

伪元素由两个冒号（:)和后面的伪元素的名称组成。

A pseudo-element is made of two colons (::) followed by the name of the pseudo-element.

来源

它最初只有一个冒号，但已更改为区分它与伪类（如：hover ，：first-child ，：not 等）。最好使用： for 之前的和之后的伪元素因为单冒号具有更好的浏览器支持，即在早期的IE版本中。

It was originally only a single colon, but was changed to differentiate it from pseudo classes (like :hover, :first-child, :not etc). It's best to use : for before and after pseudo elements since the single colon has better browser support, namely in earlier IE versions.

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