type: string, default: ""
When specified by the image attribute or using the IMG element in HTML-like labels.
imagepath should be a list of (absolute or relative) pathnames, each separated by a semicolon ; (for Windows) or a colon : (all other OS).
The first directory in which a file of the given name is found will be used to load the image.
If imagepath is not set, relative pathnames for the image file will be interpreted with respect to the current working directory.
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attrs/imagepath/