Created attachment 466620 [details] Safari vs. Chrome Go to https://sapphire-handy-butternut.glitch.me/. In the tab, it says the app is running in the tab. Add the app to the Dock and it should say it's running as a standalone web app, but it doesn't. Compare the behavior in Chrome (see screenshot).
<rdar://problem/110403186>
Possibly related to #257776 (exposing navigator.standalone on macOS)
FWIW, `navigator.standalone` is not standardized as far as I can tell: https://developer.mozilla.org/en-US/docs/Web/API/Navigator#navigator.standalone. There's no trace at an attempt to do so in https://github.com/whatwg/html/issues?q=is%3Aissue+%28%22standalone%22+OR+%22navigator.standalone%22%29+ either.
Thanks for trying out web apps on macOS. We appreciate the testing and feedback. With my Apple hat on: The cause of this particular issue in the first macOS Sonoma developer seed isn't in WebKit, but rather in Apple's hosting application. We look forward to developers continuing to try out the feature in future seeds. With my WebKit hat on: The appropriate "webkit.org bug accounting" step here is to close as invalid.
I'm adjusting the status to MOVED because this is a real issue, it's just not one that can be fixed in the WebKit Open Source code. The work is being done under <rdar://problem/110403186> in the appropriate part of the system.
Thanks for working on this at the relevant level then. Glad you agree it's something that needs fixing. Please also see https://github.com/w3c/manifest/issues/1092#issuecomment-1584312331 for some relevant side notes.
We will update this bugzilla as soon as a beta is available with the correct behavior.
Thank you for your bug report! This issue has been resolved in macOS Sonoma Beta 3 (23A5286g).