HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>type and name AND</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    label { display: block; margin: 10px 0; }
    .hi { outline: 2px solid #2563eb; }
  </style>
</head>
<body>
  <label><input type="checkbox" name="agree"> I agree</label>
  <label><input type="checkbox" name="newsletter"> Newsletter</label>
  <label><input type="text" name="agree" value="text field"> Not a checkbox</label>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $('input[type="checkbox"][name="agree"]').addClass("hi");
  </script>
</body>
</html>

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input[type="checkbox"][name="agree"] (Try It)