<html class="reftest-wait"> <head> <script> function boom() { document.body.offsetHeight; var ninediv = document.getElementById("nine"); var parent = ninediv.parentNode; for (var i = 4; i <= 8; i++) { var newdiv = document.createElement("div"); newdiv.appendChild(document.createTextNode(i)); parent.insertBefore(newdiv, ninediv); } for (var i = 13; i <= 15; i++) { var newdiv = document.createElement("div"); newdiv.appendChild(document.createTextNode(i)); parent.appendChild(newdiv); } document.body.offsetHeight; document.documentElement.className = ""; } </script> </head> <body onload="boom();"> <div>1</div> <div>2</div> <div>3</div> <div id="nine">9</div> <div>10</div> <div>11</div> <div>12</div> </body> </html>