Re: [w3ctag/design-reviews] Realms API ECMAScript Proposal (#542)

@leobalter or @littledan what are the new communication channels that will be possible with having this new capability? Having read the explainer and security questionnaire I couldn't find a clear answer if they will be less or more compared to what is available today. 
For example, could some nested realm that happen to be cross origin be able to leak/get information from the top level document that's not possible today? Also, if I create a real in one scope with mutation observers etc. and pass it to another realm could that become leaky?
Again, I'm sure this is probably already answered somewhere but it wasn't obvious or easy for understand. Any pointers appreciated.

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