[Webkit-unassigned] [Bug 224274] New: window.closed of opened window remains false when it is closed in standalone mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=224274

            Bug ID: 224274
           Summary: window.closed of opened window remains false when it
                    is closed in standalone mode
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: chenhaoftk at gmail.com

Minimal repro: https://wuchenhao.github.io/open-window/index.html

Symptom: when a window is opened from standalone mode, its `closed` property is not updated to `true` when the window is closed.

Repro steps:
  1. Visit above URL on iPhone
  2. Add the page to home screen
  3. Open the page from home screen (page should be opened in standalone mode)
  4. Click the "Open Window" button. A blank page should be opened.
  5. Close the blank page. Observe that there is no alert window showing up - indicating that `window.closed` remains `false`.

Additional information:
  1. The issue only exists in iOS standalone mode. Also Mac Safari doesn't exhibit this issue.

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