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<html>
<head>
<meta charset="utf-8" />
<title>Reference #1 for bug #1043537</title>
<style>
div {
width: 200px;
height: 200px;
background: yellow;
}
div:before {
content: '';
background: hotpink;
display: block;
width: 40px;
height: 40px;
overflow: hidden;
}
</style>
</head>
<body>
<div></div>
</body>
</html>