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Test Info:

<!DOCTYPE html>
<style>
table {
table-layout: fixed;
width: 100%;
border-collapse: collapse;
}
</style>
<table>
<tbody>
<tr>
<td colspan="4">Spanning.</td>
</tr>
</tbody>
<tbody>
<tr id="target"></tr>
</tbody>
</table>
<script>
onload = function() {
var row = document.getElementById("target");
for (var i = 1; i <= 4; ++i) {
document.body.offsetWidth;
var cell = document.createElement("td");
cell.textContent = i;
row.appendChild(cell);
}
}
</script>