HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery checkbox selector compare</title>
  <style>
    #log { font-family: monospace; white-space: pre-line; margin-top: 12px; }
  </style>
</head>
<body>
  <input type="checkbox"> <input type="checkbox"> <input type="checkbox">
  <input type="radio"> <input type="text">
  <div id="log"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var lines = [
      "input:checkbox → " + $("input:checkbox").length,
      "[type=checkbox] → " + $("input[type='checkbox']").length
    ];
    $("#log").text(lines.join("\n"));
  </script>
</body>
</html>

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jQuery input:checkbox vs [type=checkbox] (Try It)