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chromium/third_party/blink/web_tests/tables/mozilla/dom/deleteColGroup1.html 

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

function doIt() {
  var table = document.getElementsByTagName("TABLE")[0];
  var colgroup = document.getElementsByTagName("COLGROUP")[0];
  table.removeChild(colgroup);
}
</SCRIPT>  
</HEAD>
<BODY onload="doIt()">
The 2 tables should look the same
<table bgcolor=orange border>
 <colgroup span=2 width=100></colgroup>
 <colgroup span=2 width=200></colgroup>
 <tr>
  <td>200</td><td>200</td><td>auto</td><td>auto</td>
 </tr>
</table>
<BR>
<table bgcolor=orange border>
 <colgroup span=2 width=200></colgroup>
 <tr>
  <td>200</td><td>200</td><td>auto</td><td>auto</td>
 </tr>
</table>
<BR>

</BODY></HTML>