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chromium/third_party/blink/web_tests/external/wpt/preload/preload-default-csp.sub.html 

<!DOCTYPE html>
<meta http-equiv="Content-Security-Policy" content="script-src 'self' 'unsafe-inline'; default-src 'none'; connect-src 'self';">
<title>Makes sure that preload requests respect CSP</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/preload/resources/preload_helper.js"></script>
<link rel=preload href="http://{{host}}:{{ports[http][1]}}/preload/resources/stash-put.py?key={{uuid()}}" as=style>
<link rel=preload href="/preload/resources/stash-put.py?key={{uuid()}}" as=style>
<link rel=preload href="/preload/resources/stash-put.py?key={{uuid()}}" as=image>
<link rel=preload href="/preload/resources/stash-put.py?key={{uuid()}}" as=font crossorigin>
<link rel=preload href="/preload/resources/stash-put.py?key={{uuid()}}" as=video>
<link rel=preload href="/preload/resources/stash-put.py?key={{uuid()}}" as=audio>
<link rel=preload href="/preload/resources/stash-put.py?key={{uuid()}}" as=track>
<link rel=preload href="/preload/resources/stash-put.py?key={{uuid()}}" as=foobarxmlthing>
<link rel=preload href="/preload/resources/stash-put.py?key={{uuid()}}">
<body>
<script>
promise_test(async (t) => {
  verifyPreloadAndRTSupport();
  const keys = [];
  const links = document.querySelectorAll('link');
  for (const link of links) {
    if (link.rel === 'preload') {
      const r = /\?key=([a-zA-Z0-9\-]+)$/;
      keys.push(link.href.match(r)[1]);
    }
  }
  await new Promise((resolve) => step_timeout(resolve, 3000));

  for (const key of keys) {
    assert_false(await hasArrivedAtServer(key));
  }
}, 'Preload requests are blocked by CSP ("default-src \'none\').');
</script>