<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>