In another thread
the following came up:
Asked around, someone mentioned this font: Noto Nastaliq Urdu
Sure enough, it contains contextual lookups which refer to contextual lookups.
Can anyone point to other examples? What Latin fonts, if any, use this method?
[BTW: This font is problematic. Notes for discussion/support at some future point: i) Preview has difficulties rendering certain GSUB's; ii) mark, mkmk tables are worthless for practical applications involving vowels; etc.]