td line-height:1.5; line-height:1.5em; line-height:75%;}
<?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'>
td {
width:200px;
font:12pt arial;
}
td.number {font-size: 12pt; line-height:1.5;}
td.length {font-size: 12pt; line-height:1.5em;}
td.percentage {font-size: 12pt; line-height:75%;}
</style>
</head>
<body>
<table>
<tr>
<td class="number">The text here uses a number, in this case 1.5, to specify the line-height. The text here uses a number, in this case 1.5, to specify the line-height.</td>
<td class="length">The text here uses a length of 1.5em to specify the line-height. The text here uses a length of 1.5em to specify the line-height.</td>
<td class="percentage">The text here uses a percentage, in this case 75%, to specify the line-height. The text here uses a percentage, in this case 75%,, to specify the line-height.</td>
</tr>
</table>
</body>
</html>
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