[Docs]More details on Emulated POSIX TCP Sockets over WebSockets ?

I have been reading the docs at https://emscripten.org/docs/porting/networking.html

And I have come across the Emulated POSIX TCP Sockets over WebSockets section that says ```"This emulation is not very complete at the moment, it is likely that you will run into problems out of the box and need to adapt the code to work within the limitations that this emulation provides."```

What kind of limitations does the emulation have ? And what adaptations should one consider when using this functionality ?