font-size larger is incremental
<!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-family: "Rockwell";
font-size: 16px;
}
div {
border: 1px solid gray;
padding: 5px;
margin-left: 20px;
}
</style>
</head>
<body style='background: rgb(240, 240, 240);'>
font-size: 16px;
<div style='font-size: larger; background: rgb(220, 220, 220);'>
font-size: larger; <span style='font-size: 18px;'>font-size: 18px;</span>
</div>
<div style='font-size: larger; background: rgb(200, 200, 200);'>
font-size: larger; <span style='font-size: 24px;'>font-size: 24px;</span>
</div>
<div style='font-size: larger; background: rgb(180, 180, 180);'>
font-size: larger; <span style='font-size: 32px;'>font-size: 32px;</span>
</div>
<div style='font-size: larger; background: rgb(160, 160, 160);'>
font-size: larger; <span style='font-size: 48px;'>font-size: 48px;</span>
</div>
<div style='font-size: larger; background: rgb(220, 220, 220);'>
font-size: larger; <span style='font-size: 18px;'>font-size: 18px;</span>
<div style='font-size: larger; background: rgb(200, 200, 200);'>
font-size: larger; <span style='font-size: 24px;'>font-size: 24px;</span>
<div style='font-size: larger; background: rgb(180, 180, 180);'>
font-size: larger; <span style='font-size: 32px;'>font-size: 32px;</span>
<div style='font-size: larger; background: rgb(160, 160, 160);'>
font-size: larger; <span style='font-size: 48px;'>font-size: 48px;</span>
</div>
</div>
</div>
</div>
</body>
</html>
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