Re: [w3c/manifest] Add a manifest option for the declaration of the web application running pattern (Issue #1019)

It's certainly true that there are some applications that only have one window (e.g., on my Mac, calendar, messages, Spotify, etc.). 

> For instance, an online exam PWA that wants students can only open one exam window. 

I'd be concerned about the reliability of this mechanism as a policy enforcement point. Because PWAs originate from the Web, it may be (or at least should be) quite trivial for a user to get the URL of the application to open it in a browser tab. 

>  In my opinion, allowing PWA to be singleton only is one more level of "progressive" that can greatly expand the functionality of PWAs and benefit PWA and browser developers tremendously.

I agree that it's a nice feature. The thing to be mindful of is that it would indeed be an "enhancement", and that there is no guaranteed that this would be enforceable (i.e., "prefers single window"). 

Would be great to hear thoughts from others! 

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