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<!-- START code for User Agent to hidden field
Create a hidden field with the label: User Agent -->
document.addEventListener("DOMContentLoaded", function() {
    var fieldName = "User Agent";
    var fieldLabel = window.__page_generator ? fieldName : window.btoa(fieldName);
    var userAgentArray = document.getElementsByName(fieldLabel);
    userAgentArray[0].value = navigator.userAgent;
  });
<!-- END code for User Agent to hidden field -->

<!-- START code for User Agent to hidden field -->
<!-- Create a hidden field with the label: User Agent -->
document.addEventListener("DOMContentLoaded", function() {
    var fieldName = "User Agent";
    var userAgentArray = document.getElementsByName(fieldName);
    userAgentArray[0].value = navigator.userAgent;
  });
<!-- END code for User Agent to hidden field -->