<!DOCTYPE html>
<html lang="en">
<head>
<title>Computing column measures</title>
<style>
table, td {
border: 1px solid black;
border-spacing: 0px;
text-align: center;
}
</style>
</head>
<body>
<table>
<tr>
<td>A</td>
<td>B</td>
</tr>
<tr>
<td colspan="2">CDE</td>
</tr>
</table>
</body>
</html>