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

> this.contentDocument.baseURI

You have to be careful with this one, because WebKit and Blink totally lie in that getter: they return a string that has nothing to do with the actual base URI they use.  See https://code.google.com/p/chromium/issues/detail?id=484930 and https://bugs.webkit.org/show_bug.cgi?id=144652 (which include links to and pastes of code that tests the actual base URI they use).

But yes, the upshot is that the base URI of `about:blank` is inherited.

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