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<!DOCTYPE html>
<html>
<head>
<title></title>
<style>
#red {
position: fixed;
background-color: blue;
top: 10px;
left: 10px;
}
#green {
position: fixed;
background-color: blue;
top: 10px;
width: 80px;
right: 10px;
}
#blue {
position: fixed;
background-color: blue;
left: 10px;
height: 80px;
bottom: 10px;
}
#yellow {
position: fixed;
background-color: blue;
right: 10px;
width: 80px;
height: 80px;
bottom: 10px;
}
</style>
<script>
</script>
</head>
<body>
<iframe id=red></iframe>
<iframe id=green></iframe>
<iframe id=blue></iframe>
<iframe id=yellow></iframe>
</body>
</html>