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Test Info:

div { font-size: 12px; line-height: 1.0; width: 450px }
input { 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.
<div><input type="text" value="Hello world"></div>