visibility-changed.https.html | Explore in Territory

<!DOCTYPE html>
<html>
<body>
  <fencedframe style="width: 100%; height: 300px; border: 0"></fencedframe>
  <script>
    const url = new URL("resources/visibility-changed-inner.php",
        location.href);
    document.querySelector("fencedframe").config = new FencedFrameConfig(url);
    // Finish the ref test when the visibility event has been received
    // by the fenced frame.
    if (window.testRunner) {
      testRunner.waitUntilDone();
    }
  </script>
</body>
</html>

chromium/third_party/blink/web_tests/http/tests/fenced_frame/visibility-changed.https.html