On GitHub, it seems like the javascript sources behind your pages is throwing their syntax highlighting off. Seems like when you embed HTML it hiccups. Any idea how one would fix this?
Oh, hah, it's getting bit by lone single quotes, (AKA apostrophes). I think it's something GitHub would have to fix, although perhaps a .jsx extension would help.
Update: Yep, GitHub highlights correctly with a .jsx extension - see https://github.com/nfriedly/user-agent.io/blob/jsx-test/page... - but then Next.js can't "see" the page :(
So, I'm going to have to stick with .js for now.