<!DOCTYPE html>
<html>
<title>Makes sure that preloaded resources trigger the onerror event</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>

<body>
<script>
    const {HTTP_REMOTE_ORIGIN} = get_host_info();

    function test_preconnect(origin, resource, desc) {
        promise_test(async t => {
            const result = await new Promise(async didLoad => {
                const href = `${origin}${resource}`;
                for (const rel of ['preconnect', 'preload']) {
                    const link = document.createElement('link');
                    link.href = href;
                    link.as = 'script';
                    link.rel = rel;
                    link.addEventListener('load', () => didLoad({rel, type: 'load'}));
                    link.addEventListener('error', () => didLoad({rel, type: 'error'}));
                    document.head.appendChild(link);
                    t.step_timeout(() => resolve('timeout'), 200));
                }
            });
            assert_equals(result.rel, 'preload');
        }, desc);
    }

    test_preconnect(HTTP_REMOTE_ORIGIN, '/preload/resources/dummy.js', 'Preconnect should not fire load events');
    test_preconnect('http://NON-EXISTENT.origin', '/preload/resources/dummy.js', 'Preconnect should not fire error events for non-existent origins');
    test_preconnect('some-scheme://URL', '/preload/resources/dummy.js', 'Preconnect should not fire error events for non-http(s) scheme');
</script>
</body>
</html>
