According to this annoucment and thanks to Dave Barton, chrome should be supporting MathML in the most recent beta version. I am running Version 24.0.1312.40 beta, but MathML seems to be turned off, since I can't render the examples on this page. How do I turn it on?
According to Dave Barton, Google temporarily deactivated MathML support in Chrome 24 again. It should be turned back on again soon and make it into the final release.