"post-processor"? What does that mean? Looks a lot like a pre-processor to me, except that its functionality is limited to what can be defined by pure CSS. I'm

"post-processor"? What does that mean? Looks a lot like a pre-processor to me, except that its functionality is limited to what can be defined by pure CSS. I'm not sure why you would choose this preprocessor over one with more functionality. Somebody must have thought it was a good idea to have gone through so much effort, so perhaps I'm missing something.