Re: [w3c/manifest] Additional property to define a webapp to be single instance (single-tab) (#479)

I don't think this behaviour should necessarily be part of the spec.

While one window per app is common on mobile, that's not so much the case on desktop. Also, being able to have the same website/app open in multiple tabs is arguably a feature the web has which many native app platforms do not.

Perhaps the user wants two instances of the app open to do a side-by-side comparison. I'm curious about the underlying motivations for this - really web pages should be designed with the assumption that they can be opened in multiple tabs at the same time as this is usually the case in the browser.

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