HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>radio equivalence</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    input { margin: 6px 0; }
    #output { margin-top: 12px; padding: 12px; background: #e0f2fe; border: 1px solid #0284c7; white-space: pre-line; }
  </style>
</head>
<body>
  <input type="radio" name="x" value="1"> Option 1
  <input type="radio" name="x" value="2"> Option 2
  <div id="output"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#output").text(
      "input:radio → " + $("input:radio").length +
      "\n[type=radio] → " + $("input[type=radio]").length
    );
  </script>
</body>
</html>

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:radio vs [type=radio] equivalence (Try It)