Pseudo-classes :link

The :link pseudo-class applies to links that have not yet been visited.

Syntax

selector:link{ properties }

[style.css]

 a:link{
   color: red;
 }
 a:visited{
   color: green;
 }

[index.html]

<body>
  <p><a href="http://www.w3.org/">W3C</a> is an international community</p>
</body>

The CSS Selectors Level 3 specification defines the :link pseudo-class in 6.6.1. Dynamic pseudo-classes.