Comment by chrismorgan

I’ve been tending towards the opinion that features like this are a bad idea: that we might be better served by a general “this is prose” signal that triggers things like Knuth-Plass line-breaking, partially-hung punctuation (not full, please not full, it’s awful), conservative hyphenation, maybe even spacing and stretching tweaks to reduce the need of hyphenation (like the CTAN microtype package provides), whatever else the user agent supports. Bundle it all up in an all/auto/none property that defaults to auto, and let browsers choose heuristics for normal content. (OK, so I wouldn’t limit it quite that hard, I’d make it a little more like font-variant, but I do believe the default should be heuristic-based rather than disabled.)