[Webkit-unassigned] [Bug 221283] iframe sandbox prevents extension script event listeners

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221283

--- Comment #1 from opendarwin at lapcatsoftware.com ---
Created attachment 419049

  --> https://bugs.webkit.org/attachment.cgi?id=419049&action=review

Sample Xcode project

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