revision:
The colspan attribute can be used on the following elements: <td> and <th>. It allows the single table cell to span the width of more than one cell or column.
<td/th colspan="number">
number specifies the number of columns a cell should span. The number must be an integer. Note: colspan="0" tells the browser to span the cell to the last column of the column group (colgroup).
| Monthly Savings | |
|---|---|
| January | $100 |
| January | $80 |
<table>
<tr>
<th colspan="2">Monthly Savings</th>
</tr>
<tr>
<td>January</td>
<td>$100</td>
</tr>
<tr>
<td>January</td>
<td>$80</td>
</tr>
</table>
<style>
table, th, td {border: 1px solid black;}
</style>
| Name | Expense |
|---|---|
| Eddy | $10 |
| Hilde | $8 |
| Sum: $18 | |
<table>
<tr>
<th>Name</th>
<th>Expense</th>
</tr>
<tr>
<td>Eddy</td>
<td>$10</td>
</tr>
<tr>
<td>Hilde</td>
<td>$8</td>
</tr>
<tr>
<td colspan="2">Sum: $18</td>
</tr>
</table>
<style>
table, th, td {border: 1px solid black; border-collapse: collapse;
padding: 6px; text-align:center;}
</style>