Re: [ServiceWorker] what should the document base URI for an intercepted navigation (#787)

> For stylesheets the response URL becomes the URL (as if there was a redirect)

Becomes the URL in what sense?

Let's ignore service workers for now and just consider basic HTTP redirects.  Consider a load for a stylesheet that starts with `<link rel="stylesheet" href="A">` where `A` then redirects to `B`.

The resulting `StyleSheet` object has `A` as its `.href` but uses `B` as its base URL.  See http://web.mit.edu/bzbarsky/www/testcases/css-loading/test-redirect-1.html for a simple testcase.

The first part of that is kinda specced at https://drafts.csswg.org/cssom/#concept-css-style-sheet-location and I'm not sure whether the second part is specced anywhere obvious.

But the point is that stylesheets have two URLs associated with them: one that they expose as their `.href` and another that they use as the base URL.  I assume in the service worker case `response.url` affects the latter but not the former, right?

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