[roca]

https://static.googleusercontent.com/media/research.google.c... shows that the original NaCl-x86 only allowed one sandboxed application per process. So to support pages with more than one plugin, IPC would have been needed.

Sure, (P)NaCl could have been implemented differently in a way that allowed multiple sandboxed applications per process, and then DOM access would have been easier and maybe Pepper wouldn't have been necessary, though there would have been slightly higher overhead I guess.

That's all history now.