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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>search empty vs query</title>
</head>
<body>
  <pre id="out">Waiting...</pre>
  <script>
    var code = "self.postMessage(location.search);";
    var base = URL.createObjectURL(new Blob([code], { type: "application/javascript" }));
    var left = "";
    var right = "";
    var done = 0;
    function finish() {
      done += 1;
      if (done < 2) return;
      document.getElementById("out").textContent =
        "without: " + JSON.stringify(left) +
        "\nwith: " + JSON.stringify(right);
      URL.revokeObjectURL(base);
    }
    var w1 = new Worker(base);
    w1.onmessage = function (event) {
      left = event.data;
      w1.terminate();
      finish();
    };
    var w2 = new Worker(base + "?mode=demo");
    w2.onmessage = function (event) {
      right = event.data;
      w2.terminate();
      finish();
    };
  </script>
</body>
</html>

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WorkerLocation.search empty vs query (Try It)