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<!--
Any copyright is dedicated to the Public Domain.
The green square should always be rendered at 100px.
-->
<!DOCTYPE html>
<html>
<head>
<style>
body > div {
width: 200px;
height: 200px;
float: left;
}
body > div > div {
width: 100px;
height: 100px;
background: lime;
}
</style>
</head>
<body style="margin:0">
<div><div></div></div>
<div><div></div></div>
<div><div></div></div>
<div><div></div></div>
<div><div></div></div>
</body>
</html>