.test {
  width: 200px;
  height: 200px;
  background-color: blue;
  background-image: url("http://www1.not-wpt.live:8000/css/css-values/urls/support/image-referrer-policy.py?expected_referrer=url&url=http://www1.not-wpt.live:8000/css/css-values/urls/support/external-referrer-policy-unsafe-url.sub.css" referrer-policy(unsafe-url));
}