HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>onwebkitmouseforceup</title>
  <style>
    #pad {
      width: 260px;
      height: 120px;
      border: 2px dashed #7c3aed;
      display: flex;
      align-items: center;
      justify-content: center;
      user-select: none;
      background: #f5f3ff;
    }
  </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 = "Handler property not available here.";
    }
    pad.onwebkitmouseforceup = function () {
      out.textContent = "onwebkitmouseforceup fired";
    };
  </script>
</body>
</html>

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Element webkitmouseforceup — onwebkitmouseforceup (Try It)