​Skia is, in many ways, the grandparent of modern OpenType variable fonts. Matthew Carter’s Latin successor to his lesser-known Cadmus Greek, Skia was the first of the GX fonts that allowed font variation functionality. Developed for Apple, it has been bundled with their operating systems since System 7.5 in 1994. In more recent OS’s, only the named instances of Skia’s stylistic variations are exposed in the system’s font interface, without variable controls. However, the font still contains data for fluid variation, including stylistic extremes of weight and width beyond those offered as named instances.