Digital Identity Interstitial UAF — Opener

This page opens poc.html in a script-closeable tab via window.open(). When the popup signals it is about to call navigator.credentials.get({digital:...}) while in HTML fullscreen, this page floods popup.close() so that the close lands inside the macOS nested NSApp run-loop spun by ExitFullscreenModeForTab (the run-loop entered by ShowWebModal → SetWebContentsBlocked → ExitFullscreen).