Murrine

I didn't know about the null engine, and the idea I proposed above is very similar -- BUT: The null engine is too barebones. For example, it does not use Cairo. It also does not have progress-bar animation, or many other such features that would be useful for an aspiring engine writer. Would it be too much trouble to create a stand-alone version of Candido (without Murrine, Mist, Nodoka, etc) with additional comments about the inner workings of the engine?