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Test Info:

<!DOCTYPE html>
<html>
<head>
<style>
table {background-color:green}
col {background-color:red}
td { color: white }
</style>
<script>
function runTest()
{
document.body.offsetHeight;
document.getElementById("col").style.visibility = "collapse";
}
</script>
</head>
<body onload="runTest()">
<table>
<col id="col" span="2">
<tr>
<td>One</td>
<td>Two</td>
<td>Three</td>
</tr>
</table>
</html>