Re: [ServiceWorker] Clients & postMessage (#609)

Making the clients live is going to have a lot of implications on the current design. .focus() would no longer return a new Client object because it wouldn't really make sense. Also, implementations will have to keep track of window objects that are clients and update the service workers that know about them - which, as you pointed - might be a performance issue.

Also, with Chrome shipping the current status of the specification, going backward might come with its share of compat issues.

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