<!doctype html>
<html lang="en">
<head>
    <title>Document</title>
</head>
<body>
<table>
    <caption>Superheros and sidekicks</caption>
    <colgroup>
        </div>
        <col>
        <col span="2" class="batman">
        <col span="2" class="flash">
    </colgroup>
</table>

</body>
</html>