I noticed that Wikipedia does a good job rendering formulas so that their size matches the surrounding text.
https://en.wikipedia.org/wiki/Asymptote#Vertical_asymptotes
However, a default MediaWiki install with the Math extension render formulas substantially larger than the surrounding text:
http://wiki.orthogonaldevices.com/index.php/ER-301/Limiter
How can one alter the rendered font size of MathML?