When looking at the examples page of the docs (https://bomb.sh/docs/clack/guides/examples/) I noticed that none of the example were displayed.
I don't actually know how it should look like (that's the reason I was there) but they are all empty black terminals on my side (zen & chrome, on a macbook). There is a 404 error on the request to stackblitz.com/headless so maybe that has sth. to do with it.