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Test Info:

<!DOCTYPE html>
<div style='container-type: size;'></div>
<table>
<tbody id='id_0'></tbody>
<th id='id_1'>
<tr>
<th></th>
</tr>
</th>
</table>
<script>
const tbody = document.getElementById('id_0')
tbody.getBoundingClientRect();
const theader = document.getElementById('id_1')
tbody.outerText = 'foo';
theader.setAttribute('rowspan', 100)
tbody.getBoundingClientRect();
</script>