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<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
  border: 1px solid black;
}
</style>
</head>
<body>
<h1>The th headers attribute</h1>
<table>
  <tr>
    <th id="name" colspan="2">Name</th>
  </tr>
  <tr>
    <th headers="name">Firstname</th>
    <th headers="name">Lastname</th>
  </tr>
</table>
</body>
</html>