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<!doctype html>
<html>
<body>
<div style="width:0px; position:fixed">
<div style="position:fixed; width:400px; height:400px; background-color:red"></div>
<div style="left: 200px; top: 200px; position:fixed; width:400px; height:400px; background-color:blue"></div>
</div>
<body>
</html>