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Test Info:

<!DOCTYPE html>
<html>
<body>
<table id="theTable" border="1">
<thead id="thead">
<tr><th>Header</th></tr>
</thead>
<tfoot id="tfoot"><tr><th>Footer</th></tr></tfoot>
<tbody><tr><td id="body">BODY</td></tr></tbody>
</table>
<script>
var style = document.getElementById('tfoot').style;
style.display = "none";
document.body.offsetWidth;
style.display = "table-footer-group";
document.body.offsetWidth;
style.display = "none";
</script>
</body>
</html>