> Smart kerning works by looking at single letter between two other letters. If the other letters are in different width classes, the middle letter will slide c

> Smart kerning works by looking at single letter between two other letters. If the other letters are in different width classes, the middle letter will slide closer to the narrow letter. From this paragraph it sounds like they're using ligatures, which are rules of "when this character sequence appears, use this glyph instead." But A) I'm no OTF expert, and B) I haven't dissected the font files.