[Webkit-unassigned] [Bug 272743] Responses with code 204 misbehave on Mobile (e.g., COOP is active)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=272743

--- Comment #3 from jannis.rautenstrauch at cispa.de ---
@Ahmad I use a modified version of WPT that (usually) always pass all tests as I use it for differential testing.

The outcome of the test is shown in the outcome column.
- On Safari Desktop (and all other browser) the outcome is {"window.open.opener":"object \"[object Window]\""}, the opened window shows about:blank in the URL bar and closes after 15s.
- On Safari Mobile the outcome is {"window.open.opener":"null"} , the opened window shows https://headers.webappsec.eu in the URL bar and it is not closed (as COOP is active on that response)

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