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<!doctype html>
<title>CSS Test Reference</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<style>
body, html {
margin: 0;
padding: 0;
background: green;
}
.purple-square {
background: purple;
width: 50px;
height: 50px;
}
</style>
<div class="purple-square"></div>