<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Testcase for bug 414123</title> <script> function boom() { var t = document.createTextNode('M') document.getElementById('mi1').appendChild(t); var mi = document.createElementNS("http://www.w3.org/1998/Math/MathML", "mi"); var mn = document.createElementNS("http://www.w3.org/1998/Math/MathML", "mn"); var msup = document.createElementNS("http://www.w3.org/1998/Math/MathML", "msup"); mi.appendChild(document.createTextNode('M')); mn.appendChild(document.createTextNode('2')); msup.appendChild(mi); msup.appendChild(mn); document.getElementById('m').appendChild(msup); } </script> </head> <body onload="boom()"> <math xmlns="http://www.w3.org/1998/Math/MathML"> <msup> <mi id="mi1"></mi> <mn>2</mn> </msup> </math> <math xmlns="http://www.w3.org/1998/Math/MathML"> <msup> <mi>M</mi> <mn>2</mn> </msup> </math> <math id="m" xmlns="http://www.w3.org/1998/Math/MathML"></math> </body> </html>