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<!DOCTYPE HTML>
<style>
body { width: 450px }
body, select { font-size: 12px }
</style>
<!--
In a 450px container, the minimum font size at 15em per line is 30px.
This means we map 0px-45px into 30px-45px, so 12px gets mapped to 34px.
-->
<select>
<optgroup label="Counties">
<option>Arlington
<option>Fairfax
<option>Loudon
<option>Prince William
<optgroup label="Cities">
<option>Alexandria
<option>Falls Church
<option>Manassas
<option>Manassas Park
</select>