HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>type custom</title>
</head>
<body>
  <button id="run" type="button">Dispatch save</button>
  <pre id="out">Waiting...</pre>
  <script>
    var target = new EventTarget();
    var out = document.getElementById("out");

    target.addEventListener("save", function (event) {
      out.textContent = "type = " + event.type;
    });

    document.getElementById("run").onclick = function () {
      target.dispatchEvent(new Event("save"));
    };
  </script>
</body>
</html>

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Event.type — custom event (Try It)