Understanding of the four css pseudo-class styles of tag

Pseudo class isCSS is used to add special effects to certain selectors.

Tag a contains:

,,,

Link

Link and hover

Link, hober, and active

Link, visited

When you click it and move it to the tag connection:Link, visited, hover

When you click tag a again:Link, visited, hover, active

This is the style of all combinations.

If there are multiple identical styles, the subsequent styles will overwrite the previous styles. Therefore, the definition of these four pseudo classes requires order,

This is why we call 'lvha.

Note:

Css monitoring in chrome and firefox does not display all styles, and some display may be incomplete (the four pseudo classes of tag)

However, IE is still a problem, but it remains unchanged.