<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait"> <head> <script> function boom() { var math = document.getElementById("math"); var div = document.getElementById("div") math.setAttribute("color", "g"); document.body.appendChild(div); document.documentElement.removeAttribute("class"); } </script> </head> <body onload="setTimeout(boom, 30);"> <div id="div"> <mo xmlns='http://www.w3.org/1998/Math/MathML'>+<math id="math"><mn>1</mn></math></mo> </div> </body> </html>