<head>
<style>
::selection { background-color: red; }
</style>
<script type="text/javascript" charset="utf-8">
function runTest()
{
sel.empty();
}
</script>
</head>
<body onload="runTest()">
<div><div id="target" style="display: inline-block; width: 100px; height: 50px;"></div><br></div>
<script>
var sel = getSelection();
var target = document.getElementById("target");
sel.setBaseAndExtent(target, 0, target.parentElement.nextSibling, 0);
document.body.offsetTop;
target.style.height = "100px";
</script>