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<!doctype html>
<title>CSS Test reference</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<style>
:root {
font-size: 2em;
}
div {
width: 10rem;
height: 10rem;
background: green;
}
</style>
<div></div>