Re: [w3ctag/design-reviews] Portals (#331)

Here is an [expanded explanation](https://docs.google.com/document/d/14lh5r2ImGEnIwHwDymn3PsAt1bEXP7Iocl6jILo2ngY/edit?usp=sharing) of our current thinking on the question of introducing a new `<portal>` element, compared to adding an attribute to the existing `<iframe>` element.

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