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Test Info:

<!DOCTYPE html>
<html class="test-wait">
<link rel="author" title="Oriol Brufau" href="obrufau@igalia.com">
<meta name="assert" content="Removing a column group should not crash">
<div style="display: table">
<div style="display: table-column-group" id="colgroup"></div>
<div style="display: table-column-group">
<!-- This column is in the 2nd column group. But after removing the
original 1st column group, the column needs to be associated with
the new 1st column group, since there is no 2nd column group
anymore. -->
<div style="display: table-column"></div>
</div>
<div style="display: table-cell"></div>
</div>
<script>
window.onload = function() {
colgroup.remove();
document.documentElement.classList.remove("test-wait")
};
</script>
</html>