LayoutTests/fast/table/stretchy-table-with-percent-cell.html

<style>
table {
  border-collapse: collapse;
}

td {
  padding: 0px;
}

.wide_cell {
  background-color: blue;
  height: 30px;
  width: 100%;
  padding: 0px;
}

.cell_with_padding {
  padding-left: 1px;
}

.stretch {
  width: 500px;
  height: 30px;
  background-color: green;
}
</style>
<!-- PASS if wide_cell (blue bar) is visible -->
<table class=outer_table>
  <td>
    <table>
      <td class=wide_cell></td>
      <td class=cell_with_padding></td>
    </table>
  <div class=stretch></div>
  </td>
</table>