If you want to make a cell span more than one column, you can use the colspan attribute and if you want to make a cell span more than one row, you can use the rowspan attribute. HTML tables can have cells that spans over multiple rows and/or columns.
colspan – will divide one cell/row into multiple columns, and the number of columns depend on the value of colspan attribute.
rowspan – will divide a cell into multiple rows. The number of divided rows will depend on rowspan values.
<html>
<head>
<style>
table, th, td {
border: 1px solid black;
width: 100px;
height: 50px;
}
</style>
</head>
<body>
<h1>HTML Table - colspan and rowspan example</h1>
<table>
<tr>
<th colspan="2"></th>
<th></th>
</tr>
<tr>
<td></td>
<td></td>
<td rowspan="3"></td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
</table>
</body>
</html>