This page should work in IE with the MathPlayer Plugin and in Mozilla-based browsers. The first lines of the source page are worth noting.
<?php header("Content-Type: application/xhtml+xml"); print('<?xml version="1.0" encoding="UTF-8"?>'); ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/xhtml-math11-f.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">
To properly display MathML, you may need to install fonts.