In another thread
viewtopic.php?f=3&t=7332
the following came up:
Asked around, someone mentioned this font: Noto Nastaliq UrduErwin Denissen wrote: ↑Tue Sep 05, 2017 9:26 pm We've seen fonts which contain contextual lookups which refer to contextual lookups. This is not possible within VOLT for example.
http://behdad.org/urdu/
https://www.google.com/get/noto/#nastaliq-aran
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.]