import { attribute } from "https://deno.land/x/graphviz@v0.2.1/attribute.ts";
const { pencolor } = attribute;
Color used to draw the bounding box around a cluster. If pencolor is not defined, color is used. If this is not defined, bgcolor is used. If this 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.