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

> Can you solve this issue already with service workers? 

Maybe, I don't know how to intervene in a navigation with SW. 

> That is, keep track of open windows in your service worker, and send new navigations into open windows, if any exist?

I get how one could check the focused clients through the SW, but never seen intervention of navigation. Would love to see some code, even if a rough sketch. 

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