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<!DOCTYPE html>
<html>
<body>
<form>
<select size=2 id="test">
<option>A</option>
<option>B</option>
<option>C</option>
<option>D</option>
<option>E</option>
<option>F</option>
<option>G</option>
<option>H</option>
<option selected>tag</option>
<option>J</option>
<option>K</option>
<option>L</option>
<option>M</option>
<option>N</option>
</select>
<script>
// flush layout
document.body.offsetWidth
</script>
</form>
</body>
</html>