HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>DOMActivate detect</title>
</head>
<body>
  <button type="button" id="btn">Click to probe</button>
  <pre id="status">(waiting)</pre>
  <script>
    var btn = document.getElementById("btn");
    var status = document.getElementById("status");
    var seen = false;
    btn.addEventListener("DOMActivate", function () {
      seen = true;
      status.textContent = "DOMActivate fired in this browser.";
    });
    btn.addEventListener("click", function () {
      if (!seen) {
        status.textContent = "click fired; DOMActivate not seen yet (likely unsupported).";
      }
    });
  </script>
</body>
</html>

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Element DOMActivate — support probe (Try It)