Re: [w3ctag/design-reviews] IFrame Execution Pausing (#369)

@hober @plinss and I are looking at this again at our Cupertino face-to-face meeting.

This seems like a reasonable feature to add to the Web, although as we've mentioned before we're not sure if it will actually be successful in the market.

One other technical concern that occurred to us this time that we didn't raise before is that this is building on top of feature policy, which is a spec that isn't yet adopted across browsers (and which I think some have concerns with).  There's always a risk when building new features on top of other new features that the new feature on top might have been able to succeed on its own, but fails as a result of the failure of the feature underneath it.  That doesn't necessarily mean it's better to do it a different way, but it might be worth thinking about.  (It might also be worth taking some effort to improve cross- implementer consensus about feature policy given the desire to build a bunch of other things on top of it.)

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