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

I'm very worried about exposing shadow iframes in the the light DOM's session history. It would make using history API in light DOM super error prone: it would become really hard for light DOM to know what the current state actually is.
History API is error prone enough even without shadow DOM. The recent accident where Google Ads started to do random history.go(-1) and forcing browser to go to the previous *top level* page (since go(-1) was called at wrong state or something) is just a hint of that.

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