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: otf-stix (STIX fonts) and ttf-lyx (TeX's Computer Modern fonts) to view MathML properly.