HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Worker name</title>
</head>
<body>
  <pre id="out">Waiting...</pre>
  <script>
    var code = "self.onmessage = function () { self.postMessage(self.name); };";
    var url = URL.createObjectURL(
      new Blob([code], { type: "application/javascript" })
    );
    var worker = new Worker(url, { name: "math-worker" });
    worker.onmessage = function (e) {
      document.getElementById("out").textContent = e.data;
      worker.terminate();
      URL.revokeObjectURL(url);
    };
    worker.postMessage(null);
  </script>
</body>
</html>

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Worker() — name option (Try It)