Example
Set the background color of the three columns with the <colgroup> and <col> tags:<table border="1">
<colgroup>
<col span="2" style="background-color:red">
<col style="background-color:yellow">
</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>
</table>
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The <colgroup> tag is supported in all major browsers.
Definition and Usage
The <colgroup> tag specifies a group of one or more columns in a table for formatting.The <colgroup> tag is useful for applying styles to entire columns, instead of repeating the styles for each cell, for each row.
Note: The <colgroup> tag must be a child of a <table> element, after any <caption> elements and before any <thead>, <tbody>, <tfoot>, and <tr> elements.
Tip: To define different properties to a column within a <colgroup>, use the <col> tag within the <colgroup> tag.