HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>gesturechange log</title>
  <style>
    #stage { height: 200px; border: 2px solid #333; touch-action: none; }
  </style>
</head>
<body>
  <p>Non-standard WebKit event — pinch with two fingers on Safari/iOS.</p>
  <div id="stage">Gesture stage</div>
  <pre id="out">(waiting for gesturechange)</pre>
  <script>
    var stage = document.getElementById("stage");
    var out = document.getElementById("out");
    stage.addEventListener("gesturechange", function (event) {
      out.textContent =
        "scale=" + event.scale.toFixed(3) +
        " rotation=" + event.rotation.toFixed(1) + "°";
    });
  </script>
</body>
</html>

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Element gesturechange — log scale (Try It)