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<!DOCTYPE html>
<style>
table {
table-layout: fixed;
border: 1px solid black;
width: 300px;
}
td {
background: yellow;
border: 1px solid purple;
}
</style>
<table>
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<tbody>
<td>One</td>
<td>Two</td>
<td>Three</td>
</tbody>
</table>
<script>
var t = document.querySelector("table");
// Flush layout
var width = t.offsetWidth;
// Remove the one colgroup
document.querySelector("colgroup").remove();
</script>
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