HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>AND narrows selection</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    input { display: block; margin: 6px 0; padding: 6px; width: 100%; box-sizing: border-box; }
    #output { margin-top: 12px; padding: 12px; background: #fef3c7; font-family: monospace; white-space: pre-wrap; }
  </style>
</head>
<body>
  <input id="a" name="superman">
  <input name="batman">
  <input id="c" name="newsletter">
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#output").text(
      "[name$='man'] → " + $("input[name$='man']").length + "\n[id][name$='man'] → " + $("input[id][name$='man']").length
    );
  </script>
</body>
</html>

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[name$='man'] vs [id][name$='man'] (Try It)