<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title></title>
<style type='text/css'>
body {
font-size: 18px;
}
p {
font-size: 90%;
}
</style>
</head>
<body>
This font is 18 pixels in size.
<p>
This font is 90% of the 18 pixel size
</p>
</body>
</html>