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chromium/third_party/blink/web_tests/tables/mozilla/dom/insertCols3.html 

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

function doIt() {
  var refCol = document.getElementsByTagName("COL")[2];
  var col = document.createElement("COL", null);
  col.width = 150;
  refCol.parentNode.insertBefore(col, refCol);
}
</SCRIPT>  
</HEAD>
<BODY onload="doIt()">
The 2 tables should look the same
<table bgcolor=orange border>
 <col width=50>
 <col width=100>
 <col width=200>
 <tr>
  <td>50</td><td>100</td><td>150</td><td>200</td>
 </tr>
</table>

<BR>
<table bgcolor=orange border>
 <col width=50>
 <col width=100>
 <col width=150>
 <col width=200>
 <tr>
  <td>50</td><td>100</td><td>150</td><td>200</td>
 </tr>
</table>
</BODY></HTML>