My understanding is that kernel level sandboxing in OSX is per application, not per process unless you dispatch XPC services. Does Safari utilize XPC for render

My understanding is that kernel level sandboxing in OSX is per application, not per process unless you dispatch XPC services. Does Safari utilize XPC for rendering? If not then the processes aren't sandboxes from on another unless by some mechanism internal to Safari, which is entirely possible. I was referring to the internal sandboxing Safari does to isolate plugins from everything else.