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

Thank you, @annevk , @smaug---- .

Blink is fine with 1 in https://github.com/w3c/webcomponents/issues/184#issuecomment-210321856.

Shadow DOM is originally designed to provide an encapsulation for DOM tree structures. It was not designed to provide an encapsulation for scripts. Thus, as long as nodes in a shadow tree are not leaked to outer trees, I am okay.

A *behavior leakage* (I am not sure how I can call this..) which would be caused by scripts is not what I expect Shadow DOM to prevent that. I do not want Shadow DOM to own such a role magically beyond its original role.

It would be nice that we could have a separate primitive which prevents these kinds of influences from happening, other than *reusing* a boundary provided by Shadow DOM.

A unit of a shadow tree and a unit of joint session history does not have to be the same, I guess.

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