849601.html - mozsearch

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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>