chromium/third_party/blink/web_tests/external/wpt/workers/baseurl/alpha/xhr-in-sharedworker.html

<!doctype html>
<meta charset=utf-8>
<title>Base URL in classic shared workers: XHR</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
fetch_tests_from_worker(new SharedWorker("../beta/xhr-worker.py"));
</script>