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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() {
document.body.offsetWidth;
var row = document.getElementById("target");
row.innerHTML = "<td>1</td><td>2</td><!--This comment is needed--><td>3</td><td>4</td>";
}
</script>