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chromium/third_party/blink/web_tests/external/wpt/storage/quotachange-in-detached-iframe.tentative.https.html 

<!doctype html>
<meta charset="utf-8">
<title>quotachange event on DOMWindow of detached iframe</title>
<link rel="author" href="[email protected]" title="Jarryd">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="iframe"></iframe>
<script>
'use strict';

test(t => {
  const iframe = document.getElementById('iframe');
  const frameWindow = iframe.contentWindow;
  const storageManager = frameWindow.navigator.storage;

  iframe.parentNode.removeChild(iframe);
  const emptyListener = () => {};
  storageManager.addEventListener('quotachange', emptyListener);
  storageManager.removeEventListener('quotachange', emptyListener);
}, "Add quotachange listener on detached iframe.");
</script>