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chromium/third_party/blink/web_tests/external/wpt/workers/modules/resources/new-shared-worker-window.html 

<!DOCTYPE html>
<title>SharedWorker: new SharedWorker()</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
let worker;

// Create a new shared worker for a given script url.
window.onmessage = e => {
  worker = new SharedWorker(e.data.scriptURL,
                            { name: e.data.name, type: 'module' });
  worker.port.onmessage = msg => window.opener.postMessage(msg.data, '*');
  worker.onerror = err => {
    window.opener.postMessage(['ERROR'], '*');
    err.preventDefault();
  };
}
window.opener.postMessage('LOADED', '*');
</script>