 <code>
          .red {
          color: red;
          }
        </code>.
        More details on how to style groups can be found in the section
        <a href="#Styles">Styles</a>.
      </td>
    </tr>
    <tr>
      <td>content</td>
      <td>String or Element</td>
      <td>yes</td>
      <td>The contents of the group. This can be plain text, html code or an html element.</td>
    </tr>
    <tr>
      <td>id</td>
      <td>String or Number</td>
      <td>yes</td>
      <td>An id for the group. The g