I played with that a bit but it seems to complicate the animation. Having the two values for <code>transform</code> seems to shift the <code>transform-origin</code> to the upper left corner rather than the default center. I can fix that with my own <code>transform-origin</code> values, but it still doesn't move quite the way I want it to. I could keep fussing with it to get it just right, but I'm OK sticking with the transition on <code>left</code>.