https://www.manucurist.com/cdn/shop/t/72/assets/lazyimage.js?v=132260343735824898401682416249

1/*! (c) Andrea Giammarchi @webreflection ISC */
2!function(){"use strict";var e=function(e,t){var n=function(e){for(var t=0,n=e.length;t<n;t++)r(e[t])},r=function(e){var t=e.target,n=e.attributeName,r=e.oldValue;t.attributeChangedCallback(n,r,t.getAttribute(n))};return function(o,a){var l=o.constructor.observedAttributes;return l&&e(a).then((function(){new t(n).observe(o,{attributes:!0,attributeOldValue:!0,attributeFilter:l});for(var e=0,a=l.length;e<a;e++)o.hasAttribute(l[e])&&r({target:o,attributeName:l[e],oldValue:null})})),o}};function t(e,t){(null==t||t>e.length)&&(t=e.length);for(var n=0,r=new Array(t);n<t;n++)r[n]=e[n];return r}function n(e,n){var r="undefined"!=typeof Symbol&&e[Symbol.iterator]||e["@@iterator"];if(!r){if(Array.isArray(e)||(r=function(e,n){if(e){if("string"==typeof e)return t(e,n);var r=Object.prototype.toString.call(e).slice(8,-1);return"Object"===r&&e.constructor&&(r=e.constructor.name),"Map"===r||"Set"===r?Array.from(e):"Arguments"===r||/^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(r)?t(e,n):void 0}}(e))||n&&e&&"number"==typeof e.length){r&&(e=r);var o=0,a=function(){};return{s:a,n:function(){return o>=e.length?{done:!0}:{done:!1,value:e[o++]}},e:function(e){throw e},f:a}}throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}var l,i=!0,u=!1;return{s:function(){r=r.call(e)},n:function(){var e=r.next();return i=e.done,e},e:function(e){u=!0,l=e},f:function(){try{i||null==r.return||r.return()}finally{if(u)throw l}}}}
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4/*! Lazy Image */
5class LazyImage extends HTMLImageElement {
6  constructor() {
7    super();
8
9    this.wrapper = this.closest('.media-wrapper');
10    if (this.wrapper === null) return;
11
12    this.handleLazy();
13    addEventListener('resize', this.handleLazy.bind(this), true);
14
15    const observer = new MutationObserver((changes) => {

16      changes.forEach((change) => {
17        if (change.attributeName.includes('src') || change.attributeName.includes('srcset')) {
18          this.handleLazy();
19        }
20      });
21    });
22    observer.observe(this, {attributes : true});
23  }
24
25  handleLazy () {
26    const mql = window.matchMedia('(min-width: 750px)');
27    if (mql.matches && this.classList.contains('medium-hide')) return;
28    if (!mql.matches && this.classList.contains('small-hide')) return;
29    if (this.complete || this.classList.contains('loaded')) return;
30    
31    this.wrapper.classList.add('loading');
32    this.addEventListener('load', () => {
33      const loaded = () => {
34        this.classList.add('loaded');
35        this.wrapper.classList.remove('loading');
36      };
37
38      window.requestIdleCallback ? window.requestIdleCallback(loaded, {timeout: 150}) : setTimeout(loaded);
39    }, false);
40  }
41}
42window.customElements.define('lazy-image', LazyImage, { extends: 'img' });