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<!DOCTYPE html>
<html>
<head>
<style>
body {
margin: 0px;
}
div {
position: absolute;
top: 0;
left: 0;
width: 100px;
height: 100px;
background-color: green;
}
</style>
</head>
<body>
<div></div>
<div style="top: 300px; background-color: blue;"></div>
</body>
</html>