A device with no internet emits a sealed HTTP request. Any gateway node fulfills it and relays the sealed response back to your device's key, eventual, but guaranteed. Or reach a specific service over hops://: HTTP semantics carried as sealed datagrams, terminated by the origin's own endpoint, with no third party in the middle.
The same animations from the homepage, for Offline web. Tab through the situations and watch a sealed message find a way across the mesh.
Your browser is running the real Hop protocol: every node above is the actual hop-core, compiled to WebAssembly, carrying real encrypted messages. Only the devices and their radios are simulated.