before和:: before之间有什么区别? [英] What is the difference between :before and ::before?
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问题描述
我刚刚看到一个包含 :: before
标签的CSS代码。我查看了 MDN ,了解 :: before
但是我真的不明白它。有人可以解释它是如何工作的吗?
I just saw a CSS code that included ::before
tag. I looked at MDN to see what the ::before
is but I really didn't understand it. Can someone explain how it works? Does it make a DOM element before what we select by CSS?
推荐答案
这是伪元素与伪类的区别。
This distinguishes pseudo elements from pseudo classes.
伪类和伪元素之间的区别在 http://www.d.umn.edu/~lcarlson/csswork/selectors/pseudo_dif.html
The difference between pseudo classes and pseudo elements is described at http://www.d.umn.edu/~lcarlson/csswork/selectors/pseudo_dif.html
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