HTML
(a quick guide)
<table> The table itself. <tr> Table row. <th> Header cell. <td> table cell.
<table> <tr> <th>HEAD</th> <th>HEAD</th> </tr> <tr> <td>CELL</td> <td>CELL</td> </tr> </table>
<table> HEADER <thead><tr> <th>HEAD</th> <th>HEAD</th> </tr></thead> BODY <tbody><tr>
<td>CELL</td> <td>CELL</td> </tr></tbody> FOOTER <tfoot><tr> <td>CELL</td> <td>CELL</td> </tr></tfoot> </table>
<table> COLUMN GROUPS <colgroup> <col span="2" style="background:red"> <col style="background:blue"> </colgroup>
<tr> <td>RED</td> <td>RED</td> <td>BLUE</td> </tr> </table>
<table> <tr> <td rowspan="2">2 ROWS</td> <td colspan="2">2 COLUMNS</td> </tr> </table>