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<!DOCTYPE html>
<body>
<html>
<select id="test" size="8">
</select>
<script>
var optgroup = document.createElement("optgroup");
optgroup.setAttribute('label', 'An optgroup');
var option = document.createElement("option");
var optionText = document.createTextNode("An option");
option.appendChild(optionText);
var select = document.getElementById("test");
optgroup.appendChild(option);
select.appendChild(optgroup);
</script>
</body>
</html>
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