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Test Info:

<meta charset="utf-8" />
<title>This test validates the values in resource timing for cross-origin
<meta name="timeout" content="long">
<link rel="author" title="Noam Rosenthal" href="">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script src="resources/resource-loaders.js"></script>
<script src="resources/entry-invariants.js"></script>
const {REMOTE_ORIGIN} = get_host_info();
const delay = 1;
const not_found_page = encodeURIComponent("/resource-timing/resources/");
const load_null_object = async path => {
return load.object(path, null);
const destUrl = `/common/${delay}&location=${REMOTE_ORIGIN}${not_found_page}`;
const timeBefore =;
(async () => {
// Wait 10 ms, to ensure the difference between startTime and timeBefore is
// larger than 1 ms, to avoid flakiness in browsers that clamp timestamps to
// 1 ms.
await new Promise(r => step_timeout(r, 10));
attribute_test(load_null_object, destUrl, entry => {
assert_equals(entry.startTime, entry.fetchStart, 'startTime and fetchStart should be equal');
assert_greater_than(entry.startTime, timeBefore, 'startTime and fetchStart should be greater than the time before fetching');
assert_less_than(Math.round(entry.startTime - timeBefore), delay * 1000, 'startTime should not expose redirect delays');
}, "Verify that cross-origin object resources don't implicitly expose their redirect timings")