HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mousedown mouseup</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    p { color: #b91c1c; margin: 8px 0; cursor: pointer; padding: 10px; border: 1px solid #fca5a5; border-radius: 4px; user-select: none; }
    p:hover { background: #fef9c3; }
    #hint { color: #64748b; font-size: 14px; border-color: #cbd5e1; }
  </style>
</head>
<body>
  <p id="hint">Press and release on the paragraph below.</p>
  <p>Press mouse and release here.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("p").not("#hint")
      .on("mouseup", function() {
        $(this).append(" Mouse up. ");
      })
      .on("mousedown", function() {
        $(this).append(" Mouse down. ");
      });
  </script>
</body>
</html>

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jQuery mouseup event — mousedown + mouseup text (Try It)