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<!DOCTYPE HTML>
<html>
<body style="background-color: green; overflow:hidden">
<div style="position:fixed; left: 0px; top: 0px; width: 100px; height: 500px; background-color: purple; z-index: -1"></div>
<div style="position:absolute; left: 0px; top: 0px; background-color: yellow; width: 100px; height: 200px"></div>
<div style="position:fixed; left: 10px; top: 10px; width: 10px; height: 10px; background-color: blue"></div>
</body>