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I'm a complete newbie at opentype features. Trying to learn as much as I can, but there doesn't seem to be that much information on the web for beginners.
I'm looking for an explanation of the logic and basic syntax of class-based kerning. Something in the style of this wonderful article about substitution features, but for kerning. I would also love any resources on specifically doing this with fontforge, but I can figure out this easier if I understand what's going on in the background (tables? subtables? what?)
Any pointers will be very much appreciated