<!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> <tr> <td style="width: 150px; background-color: yellow"></td> <td style="width: 450px; background-color: aqua"></td> </tr> <tr> <td style="background-color: blue"></td> <td style="background-color: blue"></td> </tr> </table>