https://www.hologic.es/sites/default/files/cohesion/scripts/image/init.lazyload.js?tm4wcr

1(function ($, Drupal, once) {
2  "use strict";
3
4  Drupal.behaviors.CohesionLazyLoad = {
5    attach: function (context, settings) {
6
7      function isScrollable(el) {
8        return (el.scrollWidth > el.clientWidth && (getComputedStyle(el).overflowY === 'auto' || getComputedStyle(el).overflowY === 'scroll')) ||
9          (el.scrollHeight > el.clientHeight  && (getComputedStyle(el).overflowX === 'auto' || getComputedStyle(el).overflowX === 'scroll')) ||
10          el.tagName === 'HTML';
11      }
12
13      once('lazyload-once', '[loading=lazy]', context).forEach(function(item) {
14        var $this = $(item);
15        $this.parents().each(function() {
16          var $parent = $(this);
17          if($parent.data('lazyContainerFound') === true) {
18            if($parent.data('llContainer')) {
19              $parent.data('llContainer').update();
20            }
21            return false;
22          } else if(isScrollable(this)) {
23            $parent.data('lazyContainerFound', true);
24            var llContainer = new LazyLoad({
25              container: this.tagName === 'HTML' ? document : this,
26              elements_selector: "[loading=lazy]",
27              class_loading: 'coh-lazy-loading',
28              class_loaded: 'coh-lazy-loaded',
29              class_error: 'coh-lazy-error',
30              use_native: true
31            });
32            $parent.data('llContainer', llContainer);
33            return false;
34          }
35        });
36
37        if ($.fn.matchHeight) {
38         $this.on('load', function () {
39            if ($(this).length) {
40              $.fn.matchHeight._update();
41            }
42         });
43        }
44      });
45    }
46  };
47
48})(jQuery, Drupal, once);