headURL link type: escString, default: <none>
If the edge has a headURL, headtarget determines which window of the browser is used for the URL. Setting headURL=_graphviz will open a new window if the window doesn't already exist, or reuse the window if it does.
If undefined, the value of the target is used.
Note: map, svg only.
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attrs/headtarget/