font size: pixel, point, inch, mm and em, ex
<?xml version="1.0" encoding="iso-8859-1"?>
<!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>
<title>CSS Example</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<style type='text/css'>
p {font-family:arial; font-size:12pt;}
p.px {font-size:12px;}
p.pt {font-size:12pt;}
p.pc {font-size:2pc;}
p.in {font-size:0.5in;}
p.cm {font-size:1cm;}
p.mm {font-size:12mm;}
p.em {font-size:1.5em;}
p.ex {font-size:1.5ex;}
</style>
</head>
<body>
<h1>Lengths</h1>
<p class="px">The length used here is 12 px</p>
<p class="pt">The length used here is 12 pt</p>
<p class="pc">The length used here is 2 pc</p>
<p class="in">The length used here is 0.5in</p>
<p class="cm">The length used here is 1cm</p>
<p class="mm">The length used here is 12mm</p>
<p class="em">The length used here is 1.5em</p>
<p class="ex">The length used here is 1.5ex</p>
</body>
</html>
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