[Webkit-unassigned] [Bug 265822] New: Track cross-tab WindowProxy access

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=265822

            Bug ID: 265822
           Summary: Track cross-tab WindowProxy access
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nham at apple.com

We want to track how WindowProxy is used across tabs (i.e. via an opener relationship). This can be used to build up telemetry on how useful something like `Cross-Origin-Opener-Policy: restrict-properties` would be on the web (which is a version of COOP that restricts cross-origin WindowProxy to the postMessage and closed properties).

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