What is the pseudo-class selector in CSS

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1. Pseudo-class selector, the same tag has different styles according to its different state. This is called "pseudo-class". Pseudo classes are represented by colons.

For example, div belongs to the box class, which is clear, it belongs to the box class. But what category does a belong to? I'm not sure. Because you need to see what the status is before the user clicks and what the status is after clicking. Therefore, it is called "pseudo-class".

2. Pseudo-class selector is divided into two kinds, static pseudo-class and dynamic pseudo-class.

(1) static pseudo-classes: styles that can only be used for hyperlinks. As follows:

Before the link hyperlink is clicked

After the visited link has been visited

PS: the above two styles can only be used for hyperlinks.

(2) dynamic pseudo class: a style that applies to all tags. As follows:

Hover "hover": when the mouse is over the label

: active "activate": when the mouse clicks on the tab, but does not let go.

: focus is the style when a tag gets focus (for example, an input box gets focus)

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