Re: [webcomponents] Define the behavior of '::slotted' (the former name is '::content'). (#331)

Let me clarify the definition:

`A::slotted(simple_selector)` matches a node B if and only if:

1. Selector *A* matches a slot, called *SLOT*
1. B is a member of the *distributed nodes* of SLOT
2. and, *simple_selector* matches B

Does it make sense?

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https://github.com/w3c/webcomponents/issues/331#issuecomment-164385718