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<!DOCTYPE html>
<html>
<body>
<form name="theForm">
<select name="theSelect" style="width: auto">
<option>xxxxxxxxxx</option>
</select>
</form>
<script>
// Flush reflow
document.body.offsetWidth;
document.theForm.theSelect.style.width='30em';
document.body.offsetWidth;
document.theForm.theSelect.style.width='auto';
</script>
</body>
</html>
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