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Test Info:

<!DOCTYPE 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>
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; = 'script';
link.rel = rel;
link.addEventListener('load', () => didLoad({rel, type: 'load'}));
link.addEventListener('error', () => didLoad({rel, type: 'error'}));
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');