> It's insane how powerful CSS has gotten, can you imagine building something like this 10 years ago?

Yes, but not in CSS. Actually, the fact that CSS has evolved to do this is really an indication of what a failure CSS is. Or rather, a failure of the idea that a separate language should exist for text markup. If you're going to use CSS for this kind of thing, why not use a real, powerful language that has years of experience solving problems and has lots of libraries? Why should we ignore the past and waste time rediscovering old problems and, so we can add slower, buggier kludges?