Example analysis:
The style of the link can be set with any CSS properties (such as color, font, background, etc.).
Special links can have different styles, depending on their status.
The four link statuses are:
●a:link - normal, unvisited link
●a:visited - The link that the user has visited
●a:hover -When the user mouses over the link
● a:active - the moment when the link is clicked
Note: Strictly in order, a:hover must be after a:link and a:visited, a:active must after a:hover.