blur { }

/* The blur algorithm isn't specified, so
   don't test it. */
color {
  bounds: -3 -3 50 6;
  color: black;
}
color {
  bounds: 47 -3 6 50;
  color: black;
}
color {
  bounds: 3 47 50 6;
  color: black;
}
color {
  bounds: -3 3 6 50;
  color: black;
}