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Test Info:

<!DOCTYPE html>
<html>
<head>
<style>
table { background: green }
col { background: red; visibility: collapse; }
td { color: white }
</style>
</head>
<body onload="runTest()">
<table>
<col id="x" span="1">
<tr>
<td>One</td>
<td>Two</td>
<td>Three</td>
</tr>
</table>
<script>
function runTest() {
document.body.offsetWidth;
document.getElementById("x").setAttribute("span", 2);
}
</script>
</body>
</html>