The full mosh protocol is implemented including but not limited to AES-128-OCB3, SSP transport with sequencing and retransmission, datagram fragmentation, protobuf state sync, local echo prediction, etc.
It compiles to WASM, which is how we run mosh in the browser at UnixShells.com (WebTransport (HTTP/3) carries the datagrams instead of UDP). This is how things feel instant, despite being wherever you are.