Changes figures with proportional widths to figures with tabular widths.
Small Capitals From Capitals
Turns caps (and sometimes also numerals and punctuation) into small caps. Mostly used together with Small Capitals feature to get an all-small caps setting.
Substitutes a special form of a letter occurring at the end of a word. (Common in Latin connecting scripts, and required in various non-Latin scripts like Arabic)
Replaces characters with ordinal forms for use after figures.