HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getElementsByName radio</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} label{display:block;margin:0.35rem 0;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <label><input type="radio" name="color" value="red"> Red</label>
  <label><input type="radio" name="color" value="blue" checked> Blue</label>
  <label><input type="radio" name="color" value="green"> Green</label>
  <button id="btn" type="button">Read selection</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var colors = document.getElementsByName("color");
      var selected = "(none)";
      for (var i = 0; i < colors.length; i++) {
        if (colors[i].checked) selected = colors[i].value;
      }
      document.getElementById("out").textContent =
        "length: " + colors.length + "\nselected: " + selected;
    });
  </script>
</body>
</html>

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Document.getElementsByName — radio group (Try It)