<html>
    <head>
        <style type="text/css" media="Screen">
            #leftColumn, #centreColumn {
                float: left;
            }
        </style>
     </head>
 
<body>

<div id="leftColumn">
<div>This is a test for rdar://5025925.</div>
</div>

<div id="centreColumn">
<div> The test succeeds if this does not hang or crash.</div>
</div>
        
&nbsp;
<div></div>

<script>
    var lefty = document.getElementById("leftColumn");
    var center = document.getElementById("centreColumn");
    
    lefty.offsetWidth;
    
    lefty.style.display = "none";
    lefty.style.float = "none";
    center.style.float = "none";
    
    center.offsetWidth;
    
    lefty.style.display = "block";
    lefty.style.float = "left";
    center.style.float = "left";
</script>

</body>  
</html>