https://www.nea.org/themes/custom/locker/js/footnotes.js?tltw7l

1(function ($, once) {
2  'use strict';
3  Drupal.behaviors.handleFootnotes = {
4    attach: function(context) {
5      once('handleFootnotes', 'html', context).forEach( function (element) {
6        const footnotesList = document.createElement("ul");
7        $('ul.nea_footnotes').find('li').each(function(i, el) {
8          const clone = el.cloneNode(true);
9          footnotesList.append(clone);
10        })
11
12        if(footnotesList.childElementCount===1) {
13          $('.references-list-header-plural', context).addClass('hidden');
14        }
15
16        if(footnotesList.hasChildNodes()) {
17          $('ul.nea_footnotes').remove()
18          $('div.references-list').append(footnotesList);
19          $('.references', context).removeClass('hidden');
20        }
21
22      })
23    }
24  };
25})(jQuery, once);