[Webkit-unassigned] [Bug 277044] New: Referrer not sent when opening a new tab on same origin

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=277044

            Bug ID: 277044
           Summary: Referrer not sent when opening a new tab on same
                    origin
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: desk at danielcompton.net
                CC: beidson at apple.com

In Safari, if you open a new tab (Cmd+click on a link) to a page in the same origin, the referrer is not provided, either in headers to the server, or in the JS context under `document.referrer`.

In Chrome and Firefox, the referrer is available to new tabs on the same origin.

I searched and couldn't find any bugs or documentation of this behaviour. I also tried disabling Safari's "Prevent Cross-Site tracking" but there was no change.

Tested in Safari 17.4.1 and STP Release 199 (Safari 18.0, WebKit 19619.1.22.5).

Reproduction steps:

1. Open https://news.ycombinator.com (Referrer-policy: origin)
2. Click a link to a comment thread
3. Run `document.referrer` in the developer console
4. Observe the result is "https://news.ycombinator.com"
5. Go back to https://news.ycombinator.com
6. Middle click on a link to a comment thread
7. Run `document.referrer` in the developer console
8. Observe the result is ""

In Chrome and Firefox, in step 8, they provide a referrer.

I would expect identical referrer behaviour whether a page is loaded via an in-page navigation, or via a new tab, or at the very least, sending the origin.

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