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Test Info:

body { width: 450px }
body, select { font-size: 12px }
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.
<optgroup label="Counties">
<option>Prince William
<optgroup label="Cities">
<option>Falls Church
<option>Manassas Park