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Test Info:

<HEAD>
<SCRIPT src=tableDom.js>
</SCRIPT>
<SCRIPT>
function doIt() {
var refCol = document.getElementsByTagName("COL")[1];
var col = document.createElement("COL", null);
col.width = 200;
refCol.parentNode.insertBefore(col, refCol);
// HTML5 parser implies a colgroup around col, so this test
// case should really be XHTML
}
</SCRIPT>
</HEAD>
<BODY onload="doIt()">
<table bgcolor=orange border>
<col width=100>
<col width=300>
<tr>
<td>100</td><td>200</td><td>300</td>
</tr>
</table>
</BODY></HTML>