ui-serif, ui-sans-serif, ui-monospace and ui-rounded values for font-family

Allows more control when choosing system interface fonts

system-ui value for font-family

Value for `font-family` that represents the default user interface font.

cssfontfeaturevaluesrule api: fontfamily

cssfontpalettevaluesrule api: fontfamily

fontdata api: family

fontface api: family

css at-rule: `@font-face`: font-family

css at-rule: `@font-palette-values`: font-family

css property: font-family

css property: font-family: math

svg element: font-face: font-family

global_attributes: font-family