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chromium/third_party/blink/web_tests/external/wpt/cookie-deprecation-label/cookie-deprecation-label-detached-iframe.https.html 

<!doctype html>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<body>
<script>
  promise_test(async t => {
    let label = await navigator.cookieDeprecationLabel.getValue();
    assert_equals(label, 'label_test');

    const iframe = document.createElement('iframe');
    iframe.src = "dummy.html";
    const iframeLoadedPromise = new Promise(resolve => {
      iframe.addEventListener('load', resolve, { once: true });
      document.body.append(iframe);
    });
    await iframeLoadedPromise;

    const iframeNavigator = iframe.contentWindow.navigator;
    let iframeLabel = await iframeNavigator.cookieDeprecationLabel.getValue();
    assert_equals(iframeLabel, 'label_test');

    iframe.parentNode.removeChild(iframe);

    label = await navigator.cookieDeprecationLabel.getValue();
    assert_equals(label, 'label_test');

    iframeLabel = await iframeNavigator.cookieDeprecationLabel.getValue();
    assert_equals(iframeLabel, '');
  }, 'Test navigator.cookieDeprecationLabel behavior in detached iframes');
</script>
</body>