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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
<html lang="en-US">
<head>
<title>Absolute positioning margin:auto regression</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css">
body > div {
position: relative;
border: medium solid;
width: 600px;
padding-bottom: 0.5em;
}
body > div > div {
background: blue;
width: 400px;
height: 1em;
margin-left: 100px;
}
</style>
</head>
<body>
<div>
This div should be centered within its container:
<div></div>
</div>
</body>
</html>