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chromium/third_party/blink/web_tests/external/wpt/partitioned-popins/resources/partitioned-popins.permissions-popin.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.opener);

  // Step 4 (partitioned-popins/partitioned-popins.permission-{}.tentative.sub.https.window.js)
  window.close();
})();
</script>