<html>
<head>
<script>
function runTest()
{
    document.body.offsetLeft;
    document.getElementById('target').style.paddingLeft = '400px';
    document.body.offsetLeft;
    document.getElementById('positioned').style.left = '';
    document.getElementById('positioned').style.width = '200px';
}
</script>
</head>
<body onload="runTest()">
<div style="position:absolute;left:400px;top:0px;width:100px;height:100px;background-color:red"></div>
<div style="position:absolute;left:0;top:0">
<div style="padding-left:100px" id="target"><div id="positioned" style="position:absolute;top:0;left:0;width:100px;height:100px;background-color:green"></div>
</div>
</div>