Hmm, a quick workaround is to change the script import in the HTML file from:
import {Inspector, Runtime} from "https://unpkg.com/@observablehq/notebook-runtime@1?module";
to (edit: the following works, but is unsupported: see @mbostock’s post for the correct import statements!)
import {Inspector, Runtime} from "https://unpkg.com/@observablehq/runtime@3?module"
(For some reason the most recent version runtime@4
doesn’t work at the moment either due to some issue with marked
?)