In r31334 we enabled the SVG Animation support that has already been in the engine for a while but has not been enabled by default so far. We also implemented support for the beginElement() and endElement() methods. As a result we now pass the Acid3 test 76.
SVG Animation is a specification that has not been widely implemented so far. Reaching the point where various implementations are truly interoperable will take some more effort.
Get the nightly build and try it out yourself! One test to go.