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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
function addEmptyMutationObserver()
{
var m = new MutationObserver(function () {});
var e = document.createElement('i');
m.observe(e, { childList: true });
}
function addPointlessMutationListener()
{
var a = document.createElementNS("http://www.w3.org/1999/xhtml", "div");
a.appendChild(document.createTextNode("1"));
function f() {
window.removeEventListener("DOMSubtreeModified", f);
a.insertAdjacentHTML("afterBegin", "<span></span>");
};
window.addEventListener("DOMSubtreeModified", f);
}
function boom()
{
addEmptyMutationObserver();
addPointlessMutationListener();
document.body.outerHTML = "";
}
</script>
</head>
<body onload="boom();"></body>
</html>
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