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

We have options, I see about three paths:

1. Leak. Not a lot of work, has objections from Apple and Mozilla.
2. Don't make the `iframe` element work in shadow trees. Even less work, this is the status quo in the HTML Standard.
3. Design `iframe` elements differently inside shadow trees so they do not put properties on the global object and don't interfere with the history of the browsing context. Could be quite a bit of work, I haven't had time to investigate yet.

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