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

I'm not if this is a problem with "PWAs" or with the JS that is being used to store the data for the app. 

The specification's working model is that PWAs can be either "installed" or run in (multiple) regular browser tabs (i.e., being "installed" is a "Progressive" part of a PWA, but not a requirement or expectation): as such, a PWA could be viewed in a web browser where multiple tabs could simultaneously run the application.  

It is then up to the web application to make sure it doesn't get into race conditions by, for instance, assigning a unique identifier for each open session/tab/window. 

So, although I think it be nice to say "this app is a 'singleton'", it still won't solve the race condition - because the application could still be viewed in multiple regular browser tabs. 

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