xdot format specifying an arbitrary background type: xdot, default: <none>
During rendering, the canvas is first filled as described in the bgcolor attribute.
Then, if _background is defined, the graphics operations described in the string are performed on the canvas.
See xdot format page for more information.
digraph G {
_background="c 7 -#ff0000 p 4 4 4 36 4 36 36 4 36";
a -> b
}
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attrs/background/