What are the four pseudo-classes of the a tag of CSS

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The a tag has four pseudo classes:

1.: link, "Link": before the hyperlink is clicked.

2.: visited, "visited": after the link has been visited.

3.: hover, "hover": when the mouse is over the label.

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

In css, four states must be written in a fixed order:

A:link 、 a:visited 、 a:hover 、 a:active

If it is not in order, it will be invalidated. "Love and hate Code": love hate. You must love before you hate.

Note: when writing a:link and a:visited pseudo-classes, either write at the same time or not at the same time. If you only write an attribute and a:link attribute, it is not standard.

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