Network error when running shex primer example

[henrietteharmse]

When trying to run the shex primer example in section 5.2, it gives the following error:

[ericprud]

This message in the console

Failed to load resource: net::ERR_CERT_DATE_INVALID

indicates a cert problem. I know about it and need to beat certbot into submission. I'm on bike trip for a week but may be able to get to this in some evening at a campground.
(btw, the screenshot appears to be shex.js)

[dpriskorn]

This is still an issue. Currently both links in the original ShEx specification are broken.