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<!-- START code for radio button default check -->
<script>
document.addEventListener("DOMContentLoaded", function() {    
  var fieldName = "Description here";
  var valueName = "Value here";
  var fieldLabel =  window.__page_generator ? fieldName : base64_encode(fieldName);
  var descriptionArray = document.getElementsByName(fieldLabel);
  for (var i = 0; i < descriptionArray.length; i++) {
      if (descriptionArray[i].type === "radio" && descriptionArray[i].value === valueName) {
        descriptionArray[i].checked = true;
      }
  }
});
</script>
<!-- END code for radio button default check -->

<!-- START code for radio button default check -->
<script>
document.addEventListener("DOMContentLoaded", function() {
        document.querySelector('input[value="Option 1"]').checked = true;
    });
</script>
<!-- END code for radio button default check -->

<!-- START code for radio button default check -->
<script>
document.addEventListener("DOMContentLoaded", function() {    
  var fieldName = "Description here";
  var valueName = "Value here";
  var descriptionArray = document.getElementsByName(fieldName);
  for (var i = 0; i < descriptionArray.length; i++) {
      if (descriptionArray[i].type === "radio" && descriptionArray[i].value === valueName) {
        descriptionArray[i].checked = true;
      }
  }
});
</script>
<!-- END code for radio button default check -->