il codice sembra ok, io vedo 8px...
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>testo 8 px</title>
<style type="text/css">
<!--
body {
	color: Black;
	font-family: Verdana, Geneva, Arial, Helvetica, sans-serif;
	font-size: 8px;
}
a {
	color: #B22222;
	text-decoration: none;
}
a:hover {
	color: Maroon;
	text-decoration: underline;
}
-->
</style>
</head>

<body>


testo 8 px</p>


link 8 px</p>
</body>
</html>
nb: se navighi con FF e aumenti la dimensione del testo, chiaramente vedi più grande

ciak