Handle case in simplify calculation where the root has been simplified to a CSSMathProduct with one child.
If that child could be expressed in the canonical unit, it would have been simplified further, however if the child has a unit such as percent that can't be resolved further, it will not be simplified.
Depends on #200
Handle case in simplify calculation where the root has been simplified to a CSSMathProduct with one child.
If that child could be expressed in the canonical unit, it would have been simplified further, however if the child has a unit such as percent that can't be resolved further, it will not be simplified.