x
 
<!DOCTYPE html>
<html>
<head>
<style>
a:link    {color:blue;}
a:visited {color:blue;}
a:hover   {color:red;}
a:active  {color:yellow;}
</style>
</head>
<body>
<p>将鼠标指针移动到这个链接上:<a href="https://www.w3school.org.cn">w3school.org.cn</a></p>
</body>
</html>