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Object.style.bottom=auto|%|length
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<html>
<head>
<style type="text/css">
input
{
position:absolute;
}
</style>
<script type="text/javascript">
function setBottomEdge()
{
document.getElementById("b1").style.bottom="100px";
}
</script>
</head>
<body>
<input type="button" id="b1" onclick="setBottomEdge()"
value="Set bottom edge to 100 px" />
</body>
</html>