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chromium/third_party/blink/web_tests/external/wpt/partitioned-popins/resources/partitioned-popins.permissions-iframe.html 

<!doctype html>
<meta charset="utf-8">
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script>
(async function() {
  test_driver.set_test_context(window.top);

  // Step 3 (partitioned-popins/partitioned-popins.permission-{}.tentative.sub.https.window.js)
  let message = "Success";
  try {
    window.open("/partitioned-popins/resources/partitioned-popins.permissions-popin.html", '_blank', 'popin');
  } catch (_) {
    message = "Failure";
  }

  // Step 5 (partitioned-popins/partitioned-popins.permission-{}.tentative.sub.https.window.js)
  window.top.postMessage({type: "popin", message: message}, "*");
})();
</script>