aalt	Access All Alternates
cpct	<unknown feature>
dlig	Discretionary Ligatures
fwid	Full Widths
halt	Alternate Half Widths
hwid	Half Widths
nalt	Alternate Annotation Forms
pwid	Proportional Widths
trad	Traditional Forms
vert	Vertical Writing
vhal	Alternate Vertical Half Metrics
vrt2	Vertical Alternates and Rotation
