表格与表单

表格

<table border="1px" align="center">
    <tr>
        <th>a1</th>
        <th>a2</th>
        <th colspan="2">a3</th>
    </tr>
    <tr>
        <td>b1</td>
        <td>b2</td>
        <td>b3</td>
        <td rowspan="2">b4</td>
    </tr>
    <tr>
        <td>c1</td>
        <td>c2</td>
        <td>c3</td>
    </tr>
</table>