Fetches optical-size feature data (i.e., the size feature from GPOS). Note that
the subfamily_id and the subfamily name string (accessible via the subfamily_name_id)
as used here are defined as pertaining only to fonts within a font family that differ
specifically in their respective size ranges; other ways to differentiate fonts within
a subfamily are not covered by the size feature.
Fetches optical-size feature data (i.e., the
sizefeature from GPOS). Note that the subfamily_id and the subfamily name string (accessible via the subfamily_name_id) as used here are defined as pertaining only to fonts within a font family that differ specifically in their respective size ranges; other ways to differentiate fonts within a subfamily are not covered by thesizefeature.For more information on this distinction, see the
sizefeature documentation.