HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>webkitForce — forcechanged</title>
</head>
<body>
  <p>Press on Force Touch hardware. Non-WebKit browsers stay quiet.</p>
  <pre id="out">(waiting for webkitmouseforcechanged…)</pre>
  <script>
    document.addEventListener("webkitmouseforcechanged", function (e) {
      if (typeof e.webkitForce === "number") {
        document.getElementById("out").textContent =
          "pressure: " + e.webkitForce;
      }
    });
  </script>
</body>
</html>

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MouseEvent.webkitForce — forcechanged (Try It)