<!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>
