FontVariant: "small-caps" | "oldstyle-nums" | "lining-nums" | "tabular-nums" | "common-ligatures" | "no-common-ligatures" | "discretionary-ligatures" | "no-discretionary-ligatures" | "historical-ligatures" | "no-historical-ligatures" | "contextual" | "no-contextual" | "proportional-nums" | "stylistic-one" | "stylistic-two" | "stylistic-three" | "stylistic-four" | "stylistic-five" | "stylistic-six" | "stylistic-seven" | "stylistic-eight" | "stylistic-nine" | "stylistic-ten" | "stylistic-eleven" | "stylistic-twelve" | "stylistic-thirteen" | "stylistic-fourteen" | "stylistic-fifteen" | "stylistic-sixteen" | "stylistic-seventeen" | "stylistic-eighteen" | "stylistic-nineteen" | "stylistic-twenty"