additive from-by-animationTransform
additive from-by-animateTransform for scale.
According to SMIL2.1 the final result of the previous repetition
has to be added to the animation. Because it is 0 this is in this
case the same as a non accumulative animation, indicated with
a red rectangle. The blue testcase has to cover it always.
If something red gets visible, an error is occured.
red compare
blue testcase