<html>
<head>
<script>
function boom()
{
var aaa = document.getElementById("aaa");
var bbb = document.getElementById("bbb");
aaa.parentNode.insertBefore(bbb, aaa);
}
</script>
</head>
<body onload="boom();">
<div><span><span style="display: table-caption;"></span><span id="aaa"><div></div></span></span></div>
<b id="bbb" style="display: table-caption;"></b>
</body>
</html>