type: color, default: black
If pencolor is not defined, color is used.
If color is not defined, bgcolor is used.
If bgcolor is not defined, the default is used.
Note that a cluster inherits the root graph's attributes if defined. Thus, if the root graph has defined a pencolor, this will override a color or bgcolor attribute set for the cluster.
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attrs/pencolor/