HTML <th> scope 属性

实例

把两个表头单元格规定为列的表头：

 <table border="1">
   <tr>
     <th></th>
     <th scope="col">Month</th>
     <th scope="col">Savings</th>
   </tr>
   <tr>
     <td>1</td>
     <td>January</td>
     <td>$100</td>
   </tr>
   <tr>
     <td>2</td>
     <td>February</td>
     <td>$80</td>
   </tr>
 </table>