# Differen ways to write colors, all of them should result in "red",
# except "/accent4/4":
digraph G {
  subgraph cluster_1 {
    pencolor="#ff 00 00";
# "//" means empty color scheme and is equivalen to ""
    node [ color=red fontcolor="//red" ]

    A -> B [ color="#ff0000ff" ]
  }
  C [ color="0 1.0 1.0" fontcolor="/x11/red" ]
  B -> C [ color="1.0,1.0,1.0" ]
  // results in "#ffff99"
  B [ color="/accent4/4" ]
}