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The <col> tag is used to set properties to table columns. It is used within the <colgroup> tag.
<table>
<colgroup>
<col span="2" style="background:green;"></col>
<col style="font-weight:bold;"></col>
</colgroup>
<tr>
<td>Green BG</td>
<td>Green BG 2 </td>
<td>Bold font</td>
</tr>
</table>