1566310.html - mozsearch

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<!doctype html>

<html>

<head>

<script type="text/javascript">

function noop() {}

function crash() {

  let div = document.querySelector("div");

  let ifr = document.querySelector("iframe");

  // We need a reference to the iframe's window from *before* it gets detached.

  let win = ifr.contentWindow;

  div.appendChild(ifr);

  win.addEventListener("beforeunload", noop);

  win.removeEventListener("beforeunload", noop);

</script>

</head>

<body onload="crash()">

  <div></div>

  <iframe></iframe>

</body>

</html>