<html>
<head>
<style type="text/css">
body { font-size: 10pt }
h1 { font-size: 130% }
h2 { font-size: 115% }
</style>
</head>
<body>
    <h1>Html <em>Head</em>ing</h1>
    <p>fzz</p>
    <h2>Html Heading</h2>
    <p>h1 becomes 13pt.  em inherits computed value.</p>
</body>
</html>