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chromium/third_party/blink/web_tests/tables/mozilla/dom/insertRowsRebuild1.html 

<HEAD>
<SCRIPT src=tableDom.js>
</SCRIPT>
<SCRIPT>

function doIt() {
  var tbody = document.getElementsByTagName("TBODY")[0];
  var row = document.createElement("TR", null);
  appendCell(row, 2, 1);
  appendCell(row, 1, 1);
  var refRow = document.getElementsByTagName("TR")[0];
  tbody.insertBefore(row, refRow);
}
</SCRIPT>  
</HEAD>
<BODY onload="doIt()">
The 2 tables should look the same
<table bgcolor=orange border>
 <tr>
  <td rowspan=2>c11</td><td>c12</td>
 </tr>
</table>
<BR>
<table bgcolor=orange border>
 <tr>
  <td rowspan=2>X1</td><td>X2</td>
 </tr>
 <tr>
  <td rowspan=2>c11</td><td>c12</td>
 </tr>
</table>
<BR>
</BODY></HTML>