Color used to draw the bounding box around a cluster
type: color, default:
pencolor is not defined,
color is used.
color is not defined,
bgcolor is used.
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
bgcolor attribute set for the cluster.
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Last modified June 12, 2022: add simple descriptions for attributes (b2a18ac)