<!DOCTYPE html>
<style>
table {
border-collapse: collapse;
}
td {
width: 100px;
height: 100px;
border: 1px solid black;
}
td#target {
border-style: none;
}
</style>
<table>
<tr><td></td><td></td></tr>
<tr><td></td><td id="target"></tr>
</table>