[whatwg/url] Make relative-URL-with-fragment string account for opaque-path base URLs (PR #920)

a/b against foo:opaque was considered valid by the writing section, but the parser would reject it. Now the writing section makes it clear it won't work.

Helps with #704.


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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/920

-- Commit Summary --

  * Make relative-URL-with-fragment string account for opaque-path base URLs

-- File Changes --

    M url.bs (12)

-- Patch Links --

https://github.com/whatwg/url/pull/920.patch
https://github.com/whatwg/url/pull/920.diff

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