HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Event dispatch</title>
  <style>
    #myDiv {
      width: 220px;
      padding: 16px;
      border: 2px dashed #2563eb;
      background: #eff6ff;
      user-select: none;
    }
  </style>
</head>
<body>
  <div id="myDiv">Target div</div>
  <button id="fire" type="button">Dispatch look</button>
  <pre id="out">Waiting...</pre>
  <script>
    var myDiv = document.getElementById("myDiv");
    var out = document.getElementById("out");

    myDiv.addEventListener("look", function () {
      out.textContent = "look event received!";
    });

    document.getElementById("fire").onclick = function () {
      var evt = new Event("look", { bubbles: true, cancelable: false });
      myDiv.dispatchEvent(evt);
    };
  </script>
</body>
</html>

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Event() — dispatch (Try It)