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<!DOCTYPE html>
<html>
<body>
<style>
#a { border: 1px solid black; width: 100px; height: 100px; left: 10px; }
#b { border: 1px solid blue; width: 50px; height: 50px; left: 20px; }
div { position: absolute; }
</style>
<div id="a">
<div id="b">
</div>
</div>
</body>
</html>