colgroup tag

Explanation

Colgroup tag helps to combine the columns in a table.
"Colgroup" is the collection of entire table columns.

<table border="Value"> <colgroup span="value" style="background-color:Color Name"> <colgroup width="Value"></colgroup> <colgroup width="Value"></colgroup> </colgroup> <tr> <td>Name</td> <td>Value</td> </tr> </table>

Element Specific attributes supported by this tag are:

Attribute	Value	Description
span	number	Defines how much time a <colgroup> should span in the column.

Example Code:

<table border="1">
<colgroup span="2" style="background-color:blue">
</colgroup>
<tr>
<td>Column 1</td>
<td>Column 2</td>
<td>Column 3</td>
<td>Column 4</td>
<td>Column 5</td>
</tr>
</table>

Result :

Column 1

Column 2

Column 3

Column 4

Column 5

It must be placed after <caption> and placed before <thead>, <tbody>, <tfoot> and <tr>.
It is enough to apply this tag at once, so it will insert styles to the entire columns of a table.

It is available in previous versions of HTML.
It supports both Global Attributes and Event Attributes in HTML5.