HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>force thresholds</title>
  <style>
    #pad {
      width: 280px;
      height: 110px;
      border: 2px dashed #2563eb;
      display: flex;
      align-items: center;
      justify-content: center;
      user-select: none;
      background: #eff6ff;
    }
  </style>
</head>
<body>
  <div id="pad">Vary pressure</div>
  <pre id="out">Waiting...</pre>
  <script>
    var pad = document.getElementById("pad");
    var out = document.getElementById("out");

    if (!("onwebkitmouseforcechanged" in window)) {
      out.textContent = "Thresholds need Safari Force Touch. Constants may still exist:";
      out.textContent += "\nWEBKIT_FORCE_AT_MOUSE_DOWN=" + MouseEvent.WEBKIT_FORCE_AT_MOUSE_DOWN;
      out.textContent += "\nWEBKIT_FORCE_AT_FORCE_MOUSE_DOWN=" + MouseEvent.WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN;
    }

    pad.addEventListener("webkitmouseforcechanged", function (event) {
      var f = event.webkitForce;
      var click = MouseEvent.WEBKIT_FORCE_AT_MOUSE_DOWN;
      var forceClick = MouseEvent.WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN;
      var level = "light";
      if (f >= forceClick) level = "force-click";
      else if (f >= click) level = "click";
      out.textContent =
        level + " · webkitForce=" + f.toFixed(3) +
        " (click≥" + click + ", force≥" + forceClick + ")";
    });
  </script>
</body>
</html>

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Element webkitmouseforcechanged — force thresholds (Try It)