message: [XLA] Fix rollover edge highlights in interactive-graphviz.
  Browsers were rejecting the presence of "#" in the CSS data URI.
  I don't why this broke suddenly.  Perhaps Chrome changed something.
diff: @@ -535,7 +535,12 @@ stylesheet=<
  }
  }
  - return StrFormat(fmt, graph_label, StrJoin(edge_css_rules, "\n"));
  + // Browsers require that we URI-encode the contents of our data URI. (It
  + // seems this was a relatively recent change?) In practice, this means that we
  + // need to escape '#'.
  + return StrFormat(
  + fmt, graph_label,
  + absl::StrReplaceAll(StrJoin(edge_css_rules, "\n"), {{"#", "%23"}}));
  }
  string HloDotDumper::Footer() { return StrCat(StrJoin(edges_, "\n"), "\n}"); }
  