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<!DOCTYPE HTML>
<html reftest-zoom="1.3300000429153442">
<head>
<meta charset="utf-8">
<title>Correctly masked page</title>
<style>
.box {
position: relative;
width: 420px;
height: 420px;
}
</style>
</head>
<body>
<div class="box" style="background-color: black;">
</div>
<div class="box" style="background-color: white;">
</div>
</body>
</html>