The colspan attribute of the <th> element is used to set the number of columns a header cell should span.
Following is the syntax −
<th colspan="num">
Above, num is the count of columns a header cell should span.
Let us now see an example to implement the colspan attribute of the <th> element −
Example
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
border: 2px solid green;
}
</style>
</head>
<body>
<h2>Product Expenses</h2>
<table>
<tr>
<th colspan="2">Expenses</th>
</tr>
<tr>
<td>Product Development</td>
<td>500000</td>
</tr>
<tr>
<td>Marketing</td>
<td>500000</td>
</tr>
<tr>
<td>Services</td>
<td>100000</td>
</tr>
<tr>
<td>Support</td>
<td>100000</td>
</tr>
<tr>
<td>Maintenance</td>
<td>100000</td>
</tr>
<tr>
<td colspan="2">Total Budget = INR 1300000</td>
</tr>
</table>
</body>
</html>Output
In the above example, we have set the column count to span the header cell −
<th colspan="2">Expenses</th>
The count is 2, therefore two columns will span the header cell.