[WillAdams]

Variable Axes have been around since Adobe Multiple Masters in the mid to early 90s:

https://web.archive.org/web/20091223045132/http://partners.a...

[TheRealPomax]

But the "fvar" table [1], as part of the OpenType specification, has not.

[1] https://learn.microsoft.com/en-us/typography/opentype/spec/f...