chromium/chrome/test/data/android/url_overriding/navigation_from_fenced_frame.html

<html>
<head>
  <meta name="viewport"
    content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
</head>
<body style='height:10000px;'>
  <fencedframe width="100%" height="100%" />
  <script>
    const url = new URL("navigation_from_user_gesture.html", location.href);
    document.querySelector("fencedframe").config = new FencedFrameConfig(url);
  </script>
</body>
</html>