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

> Shall we also merge IF4 and IF6 (siblings)?

I think no. Any <iframe> in shadow DOM should get its own session history tree to keep the setup simpler. There after all isn't top level browsing context inside shadow DOM, like there is in light DOM: the browsing contexts in light DOM form a tree,  browsing contexts within a shadow DOM may not form a tree.

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