Probably, sans some randomness. (I'd hope that any animation standard has the ability to move things up and down over time, which is the only part of this performed by the JavaScript)

My understanding is that SVG animation (SMIL) support isn't great, and it doesn't look to be getting any better.

I remember reading somewhere that even the browsers that do support it don't like it, for whatever reason (but I could be wrong about this, I'm having trouble finding where I read that again, and only vaguely remember it in the first place)