<!DOCTYPE html>
<html>
  <head>
    <style>
      table {
        margin: 0;
        padding: 0
        width: 50px;
        height: 100px;
        border-collapse: collapse;
      }
      tr {
        height: 50px;
      }
      td {
        width: 50px;
        margin: 0;
        padding: 0;
      }
      #rel {
        position: relative;
      }
      .abs {
        position: absolute;
        margin: 0;
        padding: 0;
        bottom: 25px;
        right: 25px;
        width: 50px;
        height: 50px;
        background-color: green;
      }
      #bad {
        background-color: blue;
      }
      #bottomright {
        position: absolute;
        margin: 0;
        padding: 0;
        bottom: 0;
        right: 0;
        width: 100px;
        height: 100px;
        overflow: visible;
      }
    </style>
  </head>
  <body>
    The green square should not completely cover the blue square.
    <div class="abs" id="bad"></div>
    <div id="bottomright">
      <table>
        <tr id="rel">
          <td>
            <div class="abs"></div>
          </td>
        </tr>
        <tr></tr>
      </table>
    </div>
  </body>
</html>