Browser requirements
Here on andonyar.com, often your browser is silently supposed to be able to handle MathML. At least, it should be able to display presentational MathML. Browsers which can do that can be found on the software list of the W3C.
If I'll use SVG is unclear up to now.
Unfortunately, ther are only a few browsers, that can handle both, MathML and SVG. I know only of Firefox and Amaya. Other browser can probably be extended with plugins.