<html class="reftest-wait"> <head> <script> function boom() { document.body.offsetHeight; var sixdiv = document.getElementById("six"); var parent = sixdiv.parentNode; for (var i = 3; i <= 5; i++) { var newdiv = document.createElement("div"); newdiv.appendChild(document.createTextNode(i)); parent.insertBefore(newdiv, sixdiv); } var elevendiv = document.getElementById("eleven"); parent = elevendiv.parentNode; for (var i = 8; i <= 10; i++) { var newdiv = document.createElement("div"); newdiv.appendChild(document.createTextNode(i)); parent.insertBefore(newdiv, elevendiv); } for (var i = 14; 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 id="six">6</div> <div>7</div> <div id="eleven">11</div> <div>12</div> <div>13</div> </body> </html>