HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>forceup cleanup</title>
  <style>
    #pad {
      width: 280px;
      height: 110px;
      border: 2px dashed #2563eb;
      display: flex;
      align-items: center;
      justify-content: center;
      user-select: none;
      background: #eff6ff;
    }
    #pad.force-active {
      background: #fef3c7;
      border-color: #d97706;
    }
  </style>
</head>
<body>
  <div id="pad">Force-click then ease</div>
  <pre id="out">Waiting...</pre>
  <script>
    var pad = document.getElementById("pad");
    var out = document.getElementById("out");

    if (!("onwebkitmouseforceup" in window)) {
      out.textContent = "Needs Safari Force Touch for this demo.";
    }

    pad.addEventListener("webkitmouseforcedown", function () {
      pad.classList.add("force-active");
      out.textContent = "force mode ON";
    });

    pad.addEventListener("webkitmouseforceup", function (event) {
      pad.classList.remove("force-active");
      out.textContent =
        "force mode OFF · webkitForce=" + event.webkitForce.toFixed(3);
    });
  </script>
</body>
</html>

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Element webkitmouseforceup — enter/exit force mode (Try It)