<!DOCTYPE html>
<style>
table {
position:relative;
top: 180px;
}
td {
width: 50px;
height: 50px;
}
</style>
<table>
<tr>
<td rowspan="2">1,1</td>
<td>1,4</td>
</tr>
<tr>
<td>2,3</td>
</tr>
<tr>
<td rowspan="2" style="background-color: green">3,1</td>
<td style="background-color: green">3,4</td>
</tr>
<tr>
<td>4,4</td>
</tr>
</table>