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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>CSS Reftest Reference</title>
<link rel="author" title="Kyle Zentner" href="mailto:zentner.kyle@gmail.com">
<link rel="author" title="Morgan Rae Reschenberg" href="mailto:mreschenberg@berkeley.edu">
<style>
#a {
display: contents;
width: 100px;
height: 100px;
background: red;
margin: 50px;
}
#b {
position: fixed;
top: 0;
left: 0;
width: 100px;
height: 100px;
background: green;
}
</style>
</head>
<body>
<div id="a">
<div>
<div id="b"></div>
</div>
</div>
</body>
</html>