In
http://en.wikipedia.org/wiki/Special:Preferences#preftab-1
Math
Always render PNG
HTML if very simple or else PNG
HTML if possible or else PNG
Leave it as TeX (for text browsers)
Recommended for modern browsers
MathML if possible (experimental)
Well gosh why don't they say what is Recommended for modern browsers?
What if you went to a restaurant and one dish was called "Recommended
for modern eaters"?