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<!DOCTYPE html>
<select size=20>
<optgroup label=group id=group>
<option>apple</option>
<option label=banana></option>
</optgroup>
<option label=cherry></option>
</select>
<script>
var group = document.getElementById('group');
group.appendChild(new Option('durian'));
var nestedGroup = document.createElement('optgroup');
nestedGroup.label = 'nested';
nestedGroup.appendChild(new Option('fig'));
group.appendChild(nestedGroup);
</script>
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