Re: [ServiceWorker] Specify .focus() and .openWindow() behaviour (#602)

The reason why ```focus()``` is limited in Chrome is to prevent pop unders and other nasty behaviours. Wouldn't allowing ```focus()``` to be called inside a ```fetch``` handler basically allowing ```focus()``` to be called at any point in time because a page could easily make sure a ```fetch``` handler is called?

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https://github.com/slightlyoff/ServiceWorker/issues/602#issuecomment-134407054