Re: [slightlyoff/ServiceWorker] Take control over the very first page (#938)

> It should take control over this page right after it is activated

This wouldn't make sense as the default, but the activated SW can call `clients.claim()` to take control of pages.

> it should be able to be registered via http headers instead of Javascript.

It already can https://slightlyoff.github.io/ServiceWorker/spec/service_worker/#link-type-serviceworker, however it doesn't block the page while the service worker installs.

Blocking the page would create a huge drop in performance, as your first render is gated on everything in the install step. Instead, we're encouraging a more progressive (and faster) model.

If you must, you could serve a loading page from the server, then refresh it once the service worker installs. But again, this creates a much slower user experience so we don't recommend it.

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