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Test Info:
<!DOCTYPE HTML>
<style>
div { font-size: 12px; width: 450px; line-height: 1.0 }
span { transform-origin: 0 0; transform: scale(1.2); }
</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.
-->
<div><span>Hello world</span></div>