table rowspan 用法

<table border="1">
  <tr>
    <th>AA1</th>
    <th>BB1</th>
	<th>CC1</th>
    <th>DD1</th>
    <th>EE1</th>
  </tr>
  <tr>
    <td rowspan="5">A1</td>
    <td rowspan="2">B1</td>
	<td>C1</td>
    <td>D1</td>
	<td>E1</td>
  </tr>
  <tr>
    <td>C2</td>
    <td>D2</td>
	<td>E2</td>
  </tr>
  <tr>
    <td rowspan="3">B2</td>
    <td>C3</td>
	<td>D3</td>
     <td>E3</td>
  </tr>
  <tr>
    <td>C4</td>
    <td>D4</td>
	<td>E4</td>
  </tr>
  <tr>
    <td>C5</td>
    <td>D5</td>
	<td>E5</td>
  </tr>
  <tr>
    <td>A2</td>
    <td>B3</td>
	<td>C6</td>
    <td>D6</td>
	<td>E6</td>
  </tr>
</table>