<html>
<head>
<style>
a:visited
{
background-color:yellow;
}
</style>
</head>
<body>
<a href="/">W3CSschool</a>
<a href="http://www.google.com">Google</a>
<a href="http://www.wikipedia.org">Wikipedia</a>
<p><b>Note:</b> The :visited selector style links to pages you have already visited.</p>
</body>
</html>