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<!DOCTYPE html>
<html>
<style>
div { height: 20px; }
div > div { width: 100px; background: green; }
body > div { direction: ltr }
</style>
<body style="width: 400px">
<div><div style="margin-left: 100px; margin-right: auto"></div></div>
<div><div style="margin-left: auto; margin-right: 100px"></div></div>
<div><div style="margin-left: auto; margin-right: auto"></div></div>
<div><div style="margin-left: 200px; margin-right: auto"></div></div>
<div><div style="margin-left: 100px; margin-right: 100px"></div></div>
</body>
</html>