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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Force threshold — webkitForce</title>
</head>
<body>
  <p>Click anywhere (Force Touch trackpads may report force).</p>
  <pre id="out"></pre>
  <script>
    function isForceClick(event) {
      if (
        !("WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN" in MouseEvent) ||
        typeof event.webkitForce !== "number"
      ) {
        return false;
      }
      return event.webkitForce >= MouseEvent.WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN;
    }

    var fake = new MouseEvent("mousedown");
    var out = document.getElementById("out");
    out.textContent = "synthetic: " + isForceClick(fake);

    document.addEventListener("mousedown", function (e) {
      out.textContent = [
        "synthetic: " + isForceClick(fake),
        "live webkitForce: " + e.webkitForce,
        "isForceClick: " + isForceClick(e)
      ].join("\n");
    });
  </script>
</body>
</html>

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WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN — webkitForce compare (Try It)