gtk/tests/reftests/css-match-siblings.css

* + *,
#red {
  color: red
}

* ~ * ~ GtkLabel,
#lime {
  color: lime;
}

* ~ * + GtkLabel ~ *,
#blue {
  color: blue;
}

* + GtkLabel ~ * ~ GtkLabel + *,
#purple {
  color: purple;
}