fonttools/Tests/feaLib/data/feature_aalt.fea

languagesystem DFLT dflt;

feature aalt {
    feature sups;
    feature frac;
    feature ordn;
} aalt;

feature sups {
    sub one by onesuperior;
    sub two by twosuperior;
    sub three by threesuperior;
} sups;

feature frac {
    sub one slash four by onequarter;
    sub one slash two by onehalf;
    sub three slash four by threequarters;
} frac;

feature ordn {
    sub [zero one two three four five six seven eight nine] [A a]' by ordfeminine;
    sub [zero one two three four five six seven eight nine] [O o]' by ordmasculine;
} ordn;

feature liga {
    sub f i by f_i;
    sub f l by f_l;
} liga;