edgeURL
The link for the non-label parts of an edge
type: escString, default: ""
edgeURL overrides any URL defined for the edge.
Also, edgeURL is used near the head or tail node unless overridden
by headURL or tailURL, respectively.
See limitation.
See also:
Valid on:
Note:
map, svg only.
Search the Graphviz codebase for "edgeURL"