Originally Posted by BangBangO
— Adobe's “rendering engine” is already doing that automatically (if average word-spacing is OK). You’ll just get a thin of a thin space.
Doing what, display a before punctuation as a thin space? I haven't seen that. What I've seen is that (for Adobe) is non-stretching in addition to non-breaking, so that when normal word spaces are stretched due to justification, 's appear thinner. Is that what you mean?