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<!DOCTYPE html>
<html>
<head>
<title>background-position: left center reference</title>
<style type="text/css">
#outer
{
border: 1px solid black;
width: 128px;
height: 128px;
}
#inner1
{
margin-left: 0px;
margin-top: 48px; /** 128px - 128px * 0.50 + 32px * 0.50 - 32px **/
width: 32px;
height: 32px;
background-image: url(aqua-32x32.png);
}
</style>
</head>
<body>
<div id="outer"><div id="inner1"></div></div>
</body>
</html>
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