喜歡這個代碼如何決定何時使用<th>或何時不使用?在<table>
<table id="presentationsContainer">
<tr>
<td class="main" width="60%">Presentation October 2009</td>
<td class="dl" width="20%">Download pdf</td>
<td class="dl" width="20%">Download ppt</td>
</tr>
<tr>
<td class="main" width="60%">Presentation October 2009</td>
<td class="dl" width="20%">Download pdf</td>
<td class="dl" width="20%">Download ppt</td>
</tr>
<tr>
<td class="main" width="60%">Presentation October 2009</td>
<td class="dl" width="20%">Download pdf</td>
<td class="dl" width="20%">Download ppt</td>
</tr>
</table>