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<!-- no doctype, to trigger quirks mode -->
<meta charset="utf-8">
<title>CSS Reference Case</title>
<style>
body {
margin: 0;
}
iframe {
box-sizing: border-box;
height: 100vh;
width: 40px;
border: 5px solid blue;
margin: 0;
background: cyan;
}
</style>
<body>
<div style="height: 0"></div>
<iframe></iframe>
</body>