<h1>
font-size: 24pt;
font-size: xx-large;
<h2>
font-size: 18pt;
font-size: x-large;
<h3>
font-size: 14pt;
font-size: large;
<h4>
font-size: 12pt;
font-size: medium;
<h5>
font-size: 10pt;
font-size: small;
<h6>
font-size: 8pt;
font-size: x-small;
font-size: 7pt;
font-size: xx-small;