This might just be the "kiss of death" for MathML. So as result, we at Calculus Humor are slowly going through old posts and are changing MathML over to $\displaystyle \LaTeX$ which can be viewed using MathJax. We will keep you updated with info as it develops.
We are informing you of this because 42.8% of viewers use Google Chrome. You can get the MathJax for Chrome™ over at https://chrome.google.com/webstore/detail/mathjax-for-chrome/elbbpgnifnallkilnkofjcgjeallfcfa to render MathML, LaTeX, and ASCIIMath using CSS & js.