type: string, default: ""
If fontnames is undefined or hd, fontconfig font conventions are used. The default Times-Roman font will be mapped to an equivalent available system font, such as Times New Roman (Windows) or Times (some Linux).
If fontnames is set to svg, the output will use known SVG fontnames. If fontnames is set to ps, PostScript font names like Times-Roman are used directly.
In all cases, the basic SVG font serif is used as a fallback for the named font. (So, a diagram containing text in Times-Roman might have that text represented in the SVG output by a <text> tag with the attribute font-family="Times-Roman,serif".)
Note: svg only.
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https://www.graphviz.org/docs/attrs/fontnames/