Reformatted excerpts from Joel VanderWerf's message of 2009-04-02:
> Is it supposed to look like this?
> 
>    dd2E[]+2=02E[]+2=0=E[]
> 

Nope. The magic of MathML is that, 10 years later, it's still a fight to
get browsers to display it.

Are you using Safari? Webkit doesn't have Mathml support.

Can you see the examples on http://www.w3.org/Math/XSL/pmathml2.xml?
-- 
William <wmorgan-ruby-talk / masanjin.net>