Add a simple service worker for offline reading of all specs

[domenic]

Seems like a fun exercise.

I wonder if we could get @jakearchibald to volunteer to do this?

[domenic]

I'm going to try this, first on streams, as a bit of a holiday project.

One thing to consider is that we could make loading spec1.spec.whatwg.org also cache spec2.spec.whatwg.org, but only by spawning an iframe for spec2.spec.whatwg.org. I'm not sure if that's worth it. For now I'll leave that out.

[annevk]

An interesting thing we can do is cache all subresources through foreign fetch so they are shared across all standards. Not supported yet by any implementation unfortunately.

[domenic]

Yeah, I asked around about how to do that in the present day and was told iframes were the answer.

[domenic]

Let's move this to whatwg/meta#3

[jakearchibald]

I totally missed this issue back in 2015, sorry 😢