Impossible before. It can't be less invasive: _original text stays intact_ - no wrapping tags.. no JS.. just works with userContent.css.. - simply another dimension.
> I'm also not an OpenType expert, so I'm sure the substitution logics could be improved upon. I'm open to sharing the modified source file to anyone interested. If you have any ideas, suggestions or feedback, let me know. You can reach me at hlotvonen@gmail.com.
- so, how far can it be improved then ?!
- what other font editors moreover to Glyph (mac only) have good support for advanced contextual alternates ?