trisquel-icecat/icecat/layout/reftests/css-disabled/select/style.css

.ref {
  background-color: green;
}

.disabled {
  background-color: red;
}

:disabled.disabled {
  background-color: green;
}

.enabled {
  background-color: green;
}

:disabled.enabled {
  background-color: red;
}