[Terr_]

> if the JavaScript isn’t run [...] you’d like the diagram to still be visible in some form.

Yeah, that's one of the things that disappointed me about the linked page, I expected the diagrams to degrade gracefully into regular ASCII-art.

One of the ways I could imagine using this being useful is in markdown documents, following the principle that the source is good-enough to follow even if some additional processing could make it better.