<!DOCTYPE html> <html> <head> <script type="text/javascript"> function boom() { window.addEventListener("DOMSubtreeModified", function(){}, false); var MATHML_NS = "http://www.w3.org/1998/Math/MathML"; var ms = document.createElementNS(MATHML_NS, "ms"); document.body.appendChild(ms); } </script> </head> <body onload="boom();"></body> </html>