<html>
<head>
<title>
heading tags
</title>
</head>
<body>
<hgroup><!-- it is used for multilevel headings-->
<h1>first heading</h1><!--first heading-->
<h2>second heading</h2><!--second heading-->
<h3>third heading</h3><!--third heading and son on-->
<h4>forth heading</h4>
<h5>fifth heading</h5>
<h6>sixth heading</h6>
</hgroup>
</body>
</html>
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note: for better result we have to use css. We will use in css unit.