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Test Info:

<!doctype html>
<meta charset="utf-8">
<title>cookieStore on DOMWindow of detached iframe</title>
<link rel="help" href="https://github.com/WICG/cookie-store">
<link rel="author" href="pwnall@chromium.org" title="Victor Costan">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="iframe"></iframe>
<script>
'use strict';
test(() => {
const iframe = document.getElementById('iframe');
const frameWindow = iframe.contentWindow;
iframe.parentNode.removeChild(iframe);
// By spec, window.cookieStore isn't nullable.
assert_true(frameWindow.cookieStore != null);
});
</script>