gtk3/testsuite/css/parser/font-family.css

a {
  font-family: initial;
}

b {
  font-family: inherit;
}

c {
  font-family: unset;
}

d {
  font-family: Macaroni;
}

e {
  font-family: "Macaroni";
}

f {
  font-family: Macaroni, Spaghetti, Sans;
}