Re: [w3c/ServiceWorker] consider Client behavior for windows where initial about:blank is replaced with a loaded document (#1091)

https://html.spec.whatwg.org/multipage/parsing.html#the-end

We currently open the client message queue after `DOMContentLoaded`. What if we avoided doing that for these initial windows?

For initial windows, we could open the client message queue after the load event (that would fit with Firefox's behaviour right @wanderview?) or expect developers to do it manually using `startMessges` or assigning to `onmessage`.

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