<p>表格带有rules="rows":</p>
<table rules="rows">
<tr>
<th>年级</th>
<th>人数</th>
</tr>
<tr>
<td>三年级</td>
<td>56</td>
</tr>
</table>
<p>表格带有rules="cols":</p>
<table rules="cols">
<tr>
<th>年级</th>
<th>人数</th>
</tr>
<tr>
<td>三年级</td>
<td>56</td>
</tr>
</table>
<p>表格带有rules="all":</p>
<table rules="all">
<tr>
<th>年级</th>
<th>人数</th>
</tr>
<tr>
<td>三年级</td>
<td>56</td>
</tr>
</table>