HN type "about the website itself, not it's content" comment but ... it would be great if we could somehow get the major browser vendors to agree on some monospaced fonts. I'm on M1 Mac and the small ASCII diagram, nothing lines up (Safari/Firefox/Chrome). I see this on many ASCII diagrams. Maybe that's the site's fault. Not sure)

The diagram looks correct for me when I disable CSS on the page or edit it's font-family to be "monospace". Seems like Geist Mono might just be borked.