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Test Info:

<!DOCTYPE html>
<html>
<head>
<style>
table { background: white }
col[span] { background: green }
td { color: white }
</style>
</head>
<body onload="runTest()">
<table>
<colgroup id="x">
<col span="2"></col>
<col id="y"></col>
</colgroup>
<tr>
<td>One</td>
<td>Two</td>
<td>Three</td>
<td>Four</td>
</tr>
</table>
<script>
function runTest() {
document.body.offsetWidth;
document.getElementById("x").insertBefore(document.createElement("col"),
document.getElementById("y"));
}
</script>
</body>
</html>