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chromium/third_party/blink/web_tests/http/tests/preload/preload-video-cors.html 

<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script>
  const t = async_test("Ensure preloads use video poster crossorigin value");
  window.addEventListener('load', t.step_func_done(function() {
      let entries = performance.getEntriesByName("http://localhost:8080/security/resources/image-access-control.php?file=../../resources/square100.png&allow=false&tao=*");
      assert_equals(entries.length, 1, "100.png should get an entry");
      assert_equals(entries[0].nextHopProtocol, '', "100.png should not be loaded");

      entries = performance.getEntriesByName("http://localhost:8080/security/resources/image-access-control.php?file=../../resources/square200.png&allow=true&tao=*");
      assert_equals(entries.length, 1, "200.png should load successfully once, as the server is using Access-Control-Allow-Origin: *");
      assert_not_equals(entries[0].nextHopProtocol, '', "200.png should be loaded");

      entries = performance.getEntriesByName("http://localhost:8080/security/resources/image-access-control.php?file=../../resources/square20.png&allow=false&tao=*");
      assert_equals(entries.length, 1, "20.png should load successfully once, as it is loaded with no-cors");
      assert_not_equals(entries[0].nextHopProtocol, '', "20.png should be loaded");
  }));
</script>
<video poster="http://localhost:8080/security/resources/image-access-control.php?file=../../resources/square100.png&allow=false&tao=*" crossorigin>
</video>

<video poster="http://localhost:8080/security/resources/image-access-control.php?file=../../resources/square200.png&allow=true&tao=*" crossorigin>
</video>

<video poster="http://localhost:8080/security/resources/image-access-control.php?file=../../resources/square20.png&allow=false&tao=*">
</video>