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Test Info:

div { background: yellow }
div { font-size: 12px; width: 450px }
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>