Only legacy kern table

PowerPoint only supports the legacy kern table. See fontations#1183.

GPOS kerning will be taken if Variable font

It seems, that for a VAR font the default opentype feature are active, which includes GPOS kerning: Glyphsapp Forum ppt-microsoft-opentype-and-gpos-kerning-work-with-vf.

This is a very interesting finding and may need some more investigation:

  • Why does this work?
  • Is it triggert by a specific table?
  • And if so, would it be possible to add such dummy table to a static font as well to trigger PPT to support opentype feature?