accumulative values-animationTransform
additive values 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
red rectangles. The blue testcase has to cover them always.
If something red gets visible, an error is occured.
red compare 2
red compare 1
blue testcase