The W3C Math Working Group has posted a new working draft of A MathML for CSS profile. "The current profile is intended to be subset of MathML 3.0 [mathml] that could be used to capture structure of mathematical formulae in the way suitable for further CSS formatting. This profile is expected to facilitate adoption of MathML in web browsers and CSS formatters, allowing them to reuse existing CSS [css] visual formatting model, enhanced with a few mathematics oriented extensions, for rendering of layouts schemata of presentational MathML. Development of the CSS profile is assumed to be coordinated with ongoing work on CSS3 and may require a limited set of new properties to be added to existing CSS3 modules."
