HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>webkitForce — pressure</title>
</head>
<body>
  <div id="pad" style="width:260px;height:120px;border:2px solid #333;display:flex;align-items:center;justify-content:center;">
    Press here
  </div>
  <pre id="out">—</pre>
  <script>
    var pad = document.getElementById("pad");
    var out = document.getElementById("out");
    pad.addEventListener("pointerdown", function (e) {
      out.textContent = "pressure: " + e.pressure;
    });
    pad.addEventListener("pointermove", function (e) {
      if (e.pressure > 0) out.textContent = "pressure: " + e.pressure;
    });
  </script>
</body>
</html>

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MouseEvent.webkitForce — PointerEvent.pressure (Try It)