from the example provided by MermaidJS
flowchart LR A:::foo & B:::bar --> C:::foobar classDef foo stroke:#f00 classDef bar stroke:#0f0 classDef foobar stroke:#00f
throws an error and will not render, initially thought this was just for styling in general but it seems to just be my actual usecase and this example case, so I'm not sure what about this exactly is causing an error