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+<!DOCTYPE HTML>
+<style>
+div { background: yellow }
+div { font-size: 12px; width: 450px }
+</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.
+However, because we've enabled the maxRatio at a value of 2.0, the mapping
+function, which would normally return 34px/12px, or about 2.83, now
+returns a ratio capped at 2.0, thus the actual font size is 24px.
+-->
+<div>Hello world</div>