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<!DOCTYPE html>
<style>
#container {
text-align: center;
width: 100px;
}
#relpos {
position: relative;
background: red;
}
#abspos {
position: absolute;
left: 0;
top: 0;
width: 50px;
height: 50px;
background: green;
}
</style>
<body>
<div id="container">
<span id="relpos">x
<span id="abspos"></span>
</span>
</div>
</body>