To display web pages containing mathml equations properly with mathml-enabled browsers, you will need stix fonts, tex's computer modern fonts, type1 'symbol' font and (possibly) some other fonts installed on your computer.

this package provides type1 symbol font which is modified from s050000l.pfb of gsfonts with fontforge.

you will also need to install the packages: fonts-stix (stix fonts) and fonts-lyx (tex's computer modern fonts) to view mathml properly.