Change font attributes within a (node) label's text?

[schmoo2k]

@steveroush

digraph H {
  a [label=<<FONT COLOR="RED" POINT-SIZE="24.0" FACE="ambrosia">line4</FONT> and then more stuff>]
  b [label=simple]
  c
  a->b->c
}

WebGraphViz actually uses “Viz.js” under the covers which is an old and archived project.
@hpcc-js/wasm - GitHub - hpcc-systems/hpcc-js-wasm: HPCC-Systems Web-Assembly (JavaScript) is similar (but maintained and up to date), you can see a test of the above here: HTML attributes in GraphViz / Gordon Smith / Observable (observablehq.com)