gtk2/tests/reftests/background-position-simple.css

@import url("reset-to-defaults.css");

* {
  background-image: linear-gradient(red, blue, red);
  background-size: 20px 20px;
  background-position: 50%;
}

#reference {
  background-image: linear-gradient(blue, red, blue, red, blue);
  background-size: initial;
  background-position: initial;
}