HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>forcedown lifecycle</title>
  <style>
    #pad {
      width: 280px;
      height: 120px;
      border: 2px dashed #dc2626;
      display: flex;
      align-items: center;
      justify-content: center;
      user-select: none;
      background: #fef2f2;
      touch-action: none;
    }
  </style>
</head>
<body>
  <div id="pad">Press / hold</div>
  <pre id="out">Ready</pre>
  <script>
    var pad = document.getElementById("pad");
    var out = document.getElementById("out");
    var timer = null;

    function log(msg) {
      out.textContent = msg;
    }

    var forceOk = "onwebkitmouseforcedown" in window;

    if (forceOk) {
      pad.addEventListener("webkitmouseforcedown", function () { log("forcedown"); });
      pad.addEventListener("webkitmouseforceup", function () { log("forceup"); });
      log("Force Touch path ready — force-click to test.");
    } else {
      pad.addEventListener("pointerdown", function () {
        log("holding…");
        timer = setTimeout(function () {
          log("long-press (fallback force-click)");
        }, 550);
      });
      pad.addEventListener("pointerup", function () { clearTimeout(timer); });
      pad.addEventListener("pointercancel", function () { clearTimeout(timer); });
      log("Fallback path ready — hold about 0.55s.");
    }
  </script>
</body>
</html>

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Element webkitmouseforcedown — down/up + long-press fallback (Try It)