The format for specifying variation settings follows. All valid CSS
font-variation-settings values other than 'normal' and 'inherited' are also
accepted, though, not documented below.
The format is a tag, optionally followed by an equals sign, followed by a
number. For example wght=500, or slnt=-7.5.
Parses a string into a HarfBuzz.variation_t.
The format for specifying variation settings follows. All valid CSS font-variation-settings values other than 'normal' and 'inherited' are also accepted, though, not documented below.
The format is a tag, optionally followed by an equals sign, followed by a number. For example
wght=500, orslnt=-7.5.