Re: [w3c/ServiceWorker] When should "imported scripts updated flag" be unset? (#1021)

Very interesting @jungkees!

Here's an expanded test: https://gist.github.com/jakearchibald/060ae42e4153837b9d9dc61e3053c975, and live demo https://cdn.rawgit.com/jakearchibald/060ae42e4153837b9d9dc61e3053c975/raw/f35e2207650f3b3307a1403ae03208c6965527c9/.

Results:

| Test | Spec | Firefox | Chrome |
| --- | --- | --- | --- |
| Root import (first run) | Download, execute & cache | As spec'd | As spec'd |
| Root import (later runs) | Fetch from cache & execute | As spec'd | As spec'd | 
| Install event import | Download, execute & cache | Downloads, executes, but does not cache | As spec'd |
| Uncached fetch event import | Throw error | Fetch from network | Fetch from network |

So I withdraw "I'm happy for us to align the spec with browsers for importScripts", since the browsers aren't particularly aligned. Also, allowing synchronous network fetches in functional events (which both browsers do) seems like a really bad idea.

Aligning to the spec seems like a better idea.

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