inserttwoparents.html

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<html class="reftest-wait">

<head>

<script>

function boom()

  document.body.offsetHeight;

  var fourehdiv = document.getElementById("foureh");

  var parent = fourehdiv.parentNode;

  for (var i = 2; i <= 3; i++) {

    var newdiv = document.createElement("div");

    newdiv.appendChild(document.createTextNode(i + "a"));

    parent.insertBefore(newdiv, fourehdiv);

  var fourbeediv = document.getElementById("fourbee");

  parent = fourbeediv.parentNode;

  for (var i = 2; i <= 3; i++) {

    var newdiv = document.createElement("div");

    newdiv.appendChild(document.createTextNode(i + "b"));

    parent.insertBefore(newdiv, fourbeediv);

  document.body.offsetHeight;

  document.documentElement.className = "";

</script>

</head>

<body onload="boom();">

<div>

  <div>1a</div>

  <div id="foureh">4a</div>

  <div>5a</div>

</div>

<div>

  <div>1b</div>

  <div id="fourbee">4b</div>

  <div>5b</div>

</div>

</body>

</html>