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Test Info:

div.outer { font-size: 12px; width: 600px }
div.middle { width: 450px; }
div.inner { width: 300px; overflow: hidden; }
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.
<div class="outer">
<div class="middle">
Text in middle.
<div class="inner">Text in inner.</div>