colgroup 整行变色

<table border="2" width="100%">
<colgroup span="2" align="left">
<col width="100px" /> //第一列的宽度 把前两列合并
</colgroup> //设置了两列的水平对齐是left
<colgroup style="color:red;" align="right"></colgroup>

<tr>
<th>ISBN</th>
<th>Title</th>
<th>Price</th>
</tr>
<tr>
<td>3476896</td>
<td>My first HTML</td>
<td>$53</td>
</tr>
<tr>
<td>2489604</td>
<td>My first CSS</td>
<td>$47</td>
</tr>
</table>