Re: [whatwg/url] URN validity as a valid URL string (Issue #868)

domenic left a comment (whatwg/url#868)

> * the test of "does not start with: a URL-scheme string, followed by U+003A (:)"

This test applies to `9780307476463`, not the whole URL.

Remember that the sub-definition of "absolute-URL string" that you're looking at is:

> a [URL-scheme string](https://url.spec.whatwg.org/#url-scheme-string) that is not an [ASCII case-insensitive](https://infra.spec.whatwg.org/#ascii-case-insensitive) match for a [special scheme](https://url.spec.whatwg.org/#special-scheme), followed by U+003A (:) and a [relative-URL string](https://url.spec.whatwg.org/#relative-url-string)

So we've already accounted for `isbn:`, and now we're looking at whether what remains (`9780307476463`) matches "relative-URL string".

I'll close this since I'm pretty sure the spec is fine here, but happy to continue discussing and reopen if I've missed something.

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