In my experience the MathML support is still mediocre, especially on Chrome.
That test page doesn't seem to use any features current Chrome doesn't support. Or do you just mean that the appearance isn't identical to the TeX rendering even if you use a font like Latin Modern?
Thnx for sharing!
With Safari (standard and tech preview) the rendering looks strange (at least). The root sign does not have a strait line at the top (for many fonts) and at least the partial derivative is not rendered as italic (for all fonts).