HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>gestureend detect</title>
  <style>
    #stage { height: 160px; border: 2px solid #333; }
  </style>
</head>
<body>
  <div id="stage">Stage</div>
  <pre id="out"></pre>
  <script>
    var out = document.getElementById("out");
    var supported =
      typeof window.GestureEvent === "function" ||
      "ongestureend" in window;
    out.textContent = supported
      ? "GestureEvent / ongestureend looks available (likely WebKit)."
      : "No GestureEvent here — use Touch/Pointer fallback.";
    if (supported) {
      document.getElementById("stage").addEventListener("gestureend", function (e) {
        out.textContent = "Ended with scale=" + e.scale.toFixed(3);
      });
    }
  </script>
</body>
</html>

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Element gestureend — feature detect (Try It)