Dereference VoID URLs and display
Add an input for users to enter a VoID URL (follow the Location header until end e.g., nice use case here is .well-known/void), dereference it and display the graph.
The problem with this is that I'd need a server. I'd like to keep this entirely client-side, simply because it requires little maintenance costs. Not to mention the low-availability of servers for small projects - they usually don't last the test of time. While a JS page usually works even after years of development inactivity.
This could work if the VoID URLs returned CORS headers.
Right, CORS is what I had in mind. http://270a.info/ should work if you want to test.