Try it Yourself

<!DOCTYPE html>
<html>
<head>
<style>
/* Default CSS Values */
table, th, td {
    border: 1px solid black;
}

colgroup {
    display: table-column-group;
}
</style>
</head>
<body>

<p>Look how the colgroup element is displayed below:</p>

<table>
  <colgroup>
    <col span="2" style="background-color:red">
    <col style="background-color:yellow">
  </colgroup>
  <tr>
    <th>ISBN</th>
    <th>Title</th>
    <th>Price</th>
  </tr>
  <tr>
    <td>3476896</td>
    <td>My first HTML</td>
    <td>$53</td>
  </tr>
  <tr>
    <td>5869207</td>
    <td>My first CSS</td>
    <td>$49</td>
  </tr>
</table>

<p>Change the default CSS settings to see the effect.</p>

</body>
</html>
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