content/base/crashtests/399712-1.html

<html class="reftest-wait">
<head>
<script>

function boom()
{
  document.getElementById("ta").style.overflow = "scroll";
  setTimeout(boom2, 12);
}

function boom2()
{
  document.getElementById("ta").style.overflow = "";
  setTimeout(boom, 12);
}

function cont()
{
  document.documentElement.removeAttribute("class");
}
</script>
</head>

<body onload="boom(); setTimeout(cont, 800);">

<textarea id="ta">x</textarea>

</body>
</html>