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Variable Font Playground

Font

Source Serif 4

Optical Sizing

fontOpticalSizing:
none

Variable

fontOpticalSizing:
auto

Variable

fontOpticalSizing:
16

Variable

Other Variation Axis

There are two types of variation axes in variable fonts: registered axes and custom axes. Registered axes include five variations: wght, wdth, opsz, ital, and slnt, while custom axes are defined by the font designer.

Source Serif 4 has 2 variations Optical Sizing(opsz) and Wight(wght)

References