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<!DOCTYPE html>
<html>
<head>
<script>

function boom()
{
    var j = 0;
    var a = document.getElementById("a");
    var r = document.createRange();
    r.setStart(a.childNodes[0], 0);
    r.setEnd(a.childNodes[1], 0);

    function f()
    {
        if (++j >= 2) {
            document.removeEventListener("DOMNodeRemoved", f, false);
        }
        r.extractContents();
    }

    document.addEventListener("DOMNodeRemoved", f, false);

    r.extractContents();
}

</script>
</head>
<body onload="boom();">
<div id="a"><span><span></span></span>X</div>
</body>
</html>