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Test Info:
<html class="reftest-wait">
<script>
function tweak() {
document.getElementById('a').appendChild(document.createTextNode('hZ'));
document.documentElement.removeAttribute("class");
}
window.onload = () => {
// double-rAF (to ensure layout/paints have been flushed) before we make
// the dynamic modification. This seems to make the bug more likely to
// reproduce, in unpatched builds.
requestAnimationFrame(() => { requestAnimationFrame(() => {
tweak();
}); });
};
</script>
<table>
<tfoot id='a'>
<th>
<textarea>Text