able is painted in front of the border of the
  block descendant, even if the table has `position: relative`.
  Gecko disagrees with this test.
">
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<table style="border-collapse: collapse; position: relative">
  <td style="border: 50px solid green; padding: 0">
    <div style="border: 50px solid red; margin: -50px"></div>
  </td>
</table>
