[Webkit-unassigned] [Bug 223439] New: location.assign("#foo") in the hashchange event listener of iframes went wrong

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223439

            Bug ID: 223439
           Summary: location.assign("#foo") in the hashchange event
                    listener of iframes went wrong
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: public at mysticatea.dev

Repro: https://github.com/mysticatea/webkit-test

I have checked it on Webkit 14.1 on Windows 10 (by playwright) and on Safari 13.1.2 on macOS 10.13.6.

In the repro, two pages exist:

- index.html
- iframe.html

`location.assign("#bar")` in index.html is expected to change the URL to `index.html#bar`.
However, in Webkit, it changed the URL to `iframe.html#bar`.

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