mozilla-release/layout/reftests/table-width/spanning-cell-sort-2-small-fixed.html

<!DOCTYPE HTML>
<title>Testcase to exercise nsSpanningCellSorter</title>
<style type="text/css">

table, td {
	border-spacing: 0;
	padding: 0; margin: 0; border: none;
	empty-cells: show;
}

td { height: 20px; }

</style>

<table style="width: 600px">
  <tr>
    <td style="background-color: blue" colspan="2"><div style="width: 200px"></div></td>
    <td style="background-color: fuchsia"></td>
    <td style="background-color: maroon"></td>
  </tr>
  <tr>
    <td style="background-color: yellow"></td>
    <td style="background-color: aqua" colspan="3"><div style="width: 300px"></div></td>
  </tr>
</table>