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<!doctype html>
<title>CSS test reference</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<style>
.ancestor {
width: 100px;
height: 100px;
position: fixed;
left: 100px;
top: 0;
background-color: green;
}
</style>
<div class="ancestor"></div>