https://www.3chi.com/wp-content/themes/flatsome/inc/integrations/wp-rocket/flatsome-wp-rocket.js?ver=3.20.11

1/* eslint-disable semi, no-var */
2Flatsome.behavior('wp-rocket-lazy-load-packery', {
3  attach: function (context) {
4    var $lazyLoad = jQuery('.has-packery .lazy-load', context)
5
6    if (!$lazyLoad.length) return
7
8    var observer = new IntersectionObserver(function (entries) {
9      entries.forEach(function (entry) {
10        if (entry.intersectionRatio > 0) {
11          observer.unobserve(entry.target)
12          jQuery(entry.target).imagesLoaded(function () {
13            jQuery('.has-packery').packery('layout')
14          })
15        }
16      })
17    }, {
18      rootMargin: '0px',
19      threshold: 0.1
20    })
21
22    $lazyLoad.each(function (i, el) {
23      observer.observe(el)
24    })
25  }
26});