[Webkit-unassigned] [Bug 226382] New: Prefetching cross-origin subresources for the current page gives double fetch

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226382

            Bug ID: 226382
           Summary: Prefetching cross-origin subresources for the current
                    page gives double fetch
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jeff.t.kaufman at gmail.com

When a page makes a cross-origin prefetch it's not used on that page.  To reproduce:

1. Turn on Develop > Experimental Features > LinkPrefetch (tested in Version 14.1)
2. Visit https://www.jefftk.com/test/prefetch/prefetch-nested
3. See that bg.css, log.js, and hello-world are immediately fetched
4. After waiting five seconds, see that they are fetched a second time (confirmed with server logs)

I tried adding "as=" attributes, without effect: https://www.jefftk.com/test/prefetch/prefetch-nested-as

It looks to me like the document is used for prefetching if I navigate to it instead of putting it in an iframe (https://www.jefftk.com/test/prefetch/prefetch-navigate).  This one does make some sense: if you prefetch a document you could plausibly either want to navigate the whole page to it, or navigate an iframe.  Chrome handles this the same way as Safari, while Firefox does the opposite; I've filed https://github.com/whatwg/html/issues/6723

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