preload-script-crossorigin-fails-cross-origin.html

<!DOCTYPE html> 
<!-- Regression test for https://crbug.com/464876. On a CORS failure, multiple
    error messages should not be logged, even if preload occurs. -->
<head>
</head>

<script src="/js-test-resources/js-test.js"></script>

<script>
    window.jsTestIsAsync = true;
    description('Preload of script with CORS failure only shows one error');

var result = "PASS";

var scriptLoad = function() {
    testFailed('Script loaded.');
};

var scriptError = function() {
    if (result === 'PASS')
        testPassed('Script error.');
    else
        testFailed('Script ran.');
    finishJSTest();
};

var checkForPreload = function(url) {
    if (internals.isPreloaded(url))
        testPassed("Did preload.");
};
</script>

<!-- Force a preload -->
<script src="http://127.0.0.1:8000/resources/slow-script.pl?delay=100"></script>
<script>
checkForPreload("http://localhost:8000/security/resources/cors-script.php?delay=100&cors=false&value=FAIL");
</script>
<script crossorigin="anonymous" src="http://localhost:8000/security/resources/cors-script.php?delay=100&cors=false&value=FAIL" onload="scriptLoad()" onerror="scriptError();"></script>

chromium/third_party/blink/web_tests/http/tests/security/preload-script-crossorigin-fails-cross-origin.html