<!DOCTYPE html>
<style>
table {
    border-collapse: collapse;
}
colgroup {
    border: 50px solid lightblue;
}
td {
    width: 20px;
    height: 20px;
    padding: 0px;
}
</style>
<script src="../../../resources/check-layout.js"></script>
<table data-expected-client-width="140">
    <colgroup><col span=2></colgroup>
    <tr>
        <td></td><td></td>
    </tr>
</table>
<script>
checkLayout("table");
</script>