Re: [ServiceWorker] Make FetchEvent.prototype.client nullable (#631)

What is an empty environment settings object? And what does that mean for `client`?

> Although the client environment for this requested resource (client request) has not been created, shouldn't FetchEvent.prototype.client return a Client object that represents the event's request's client?

How does that work? What does `postMessage()` do? (I see in the specification you have linked `postMessage()` to the definition for window's `postMessage()`. That's bogus. You need to define it yourself.

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