File: fetch_from_worker.html

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<script>
  const params = new URLSearchParams(location.search);
  const start_worker_manually = params.has('start_worker_manually');

  let worker;
  let resolve;
  function start_worker() {
    worker = new Worker(
      params.has('script') ? params.get('script') : 'fetch_from_worker.js');

    worker.onmessage = e => { resolve(e.data); };
  }

  function fetch_from_worker(url) {
    let p = new Promise(r => { resolve = r; });
    worker.postMessage({url});
    return p;
  }

  if (!start_worker_manually) {
    start_worker();
  }
</script>