Re: [w3c/webcomponents] <iframe> and the History API (#184)

> I don't understand where your rule comes from.

Yeah, that comes form my attempt to honer a well-established rule (I believe):

- Access from Inner To Outer: Allowed
- Access from Outer To Inner: Disallowed

We see a similar rule in most of programming languages. Thus, I think having this principle in our mind would be good for us.

Actually, you can see several instances of this rule in the current Shadow DOM:
e.g. 
- a event retargeting
- a concept of a *unclosed node*

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