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chromium/third_party/blink/web_tests/http/tests/cookies/partitioned-cookies/partitioned-attribute.https.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>

function deleteExistingCookie(cookieLine) {
  const expiresInPast = "; Expires=Thu, 01 Jan 1970 00:00:01 GMT";
  document.cookie = cookieLine + expiresInPast;
  assert_equals(document.cookie, "");
}

function assertInvalidCookie(cookieLine) {
  document.cookie = cookieLine;
  assert_equals(document.cookie, "");
}

test(() => {
  assert_equals(document.cookie, "");

  // Valid Partitioned cookie: has Secure, Domain is allowed.
  const cookie = "foo=bar";
  const cookieLine = cookie + "; Secure; SameSite=None; Partitioned;";
  document.cookie = cookieLine;
  assert_equals(document.cookie, cookie);
  deleteExistingCookie(cookieLine);

  // Domain is allowed.
  const domainCookieLine = cookieLine + ` Domain=${
      window.location.hostname};`;
  document.cookie = domainCookieLine;
  assert_equals(document.cookie, cookie);
  deleteExistingCookie(domainCookieLine);

  // Path is allowed.
  const pathCookieLine = cookieLine + ` Path=${
      window.location.pathname.split('/').slice(0, 2).join('/')};`;
  document.cookie = pathCookieLine;
  assert_equals(document.cookie, cookie);
  deleteExistingCookie(pathCookieLine);

  // Invalid Partitioned cookie: No Secure attribute.
  // No SameSite=None since that independently requires Secure.
  assertInvalidCookie(cookie + "; Path=/; Partitioned;");
}, "Partitioned cookie attribute semantics");

</script>