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chromium/third_party/blink/web_tests/tables/mozilla/dom/appendCol2.html 

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

function doIt() {
  var cg = document.getElementsByTagName("COLGROUP")[0];
  var col = document.createElement("COL", null);
  col.width = 200;
  cg.appendChild(col);
}
</SCRIPT>  
</HEAD>
<BODY onload="doIt()">
The 2 tables should look the same
<table bgcolor=orange border>
 <colgroup>
  <col>
 </colgroup>
 <tr>
  <td>c11</td><td>c12</td>
 </tr>
</table>
<BR>
<table bgcolor=orange border>
 <colgroup>
  <col>
  <col width=200>
 </colgroup>
 <tr>
  <td>c11</td><td>c12</td>
 </tr>
</table>
<BR>
</BODY></HTML>