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<!doctype html>
<title>CSS Test Reference</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<style>
html, body { margin: 0 }
#box {
width: 100px;
height: 100px;
background: green;
}
</style>
<div id="box"></div>