aalt	Access All Alternates
ccmp	Glyph Composition/Decomposition
cpct	<unknown feature>
dlig	Discretionary Ligatures
fwid	Full Widths
halt	Alternate Half Widths
hwid	Half Widths
liga	Standard Ligatures
nalt	Alternate Annotation Forms
pwid	Proportional Widths
vert	Vertical Writing
vhal	Alternate Vertical Half Metrics
vrt2	Vertical Alternates and Rotation
