HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>DOMActivate detail</title>
</head>
<body>
  <button type="button" id="btn">Click / double-click</button>
  <pre id="log"></pre>
  <button type="button" id="clear">Clear</button>
  <script>
    var btn = document.getElementById("btn");
    var log = document.getElementById("log");
    btn.addEventListener("DOMActivate", function (event) {
      log.textContent += "DOMActivate detail=" + event.detail + "\n";
    });
    btn.addEventListener("click", function (event) {
      log.textContent += "click detail=" + event.detail + "\n";
    });
    document.getElementById("clear").addEventListener("click", function () {
      log.textContent = "";
    });
  </script>
</body>
</html>

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Element DOMActivate — detail vs click (Try It)