https://www.pcrf.net/static_assets/js/dist/new_app.js?v=0.0.1790846187

1const check_webp_feature = (feature, callback) => {
2    var kTestImages = {
3        lossy: "UklGRiIAAABXRUJQVlA4IBYAAAAwAQCdASoBAAEADsD+JaQAA3AAAAAA",
4        lossless: "UklGRhoAAABXRUJQVlA4TA0AAAAvAAAAEAcQERGIiP4HAA==",
5        alpha: "UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAARBxAR/Q9ERP8DAABWUDggGAAAABQBAJ0BKgEAAQAAAP4AAA3AAP7mtQAAAA==",
6        animation: "UklGRlIAAABXRUJQVlA4WAoAAAASAAAAAAAAAAAAQU5JTQYAAAD/////AABBTk1GJgAAAAAAAAAAAAAAAAAAAGQAAABWUDhMDQAAAC8AAAAQBxAREYiI/gcA"
7    };
8    var img = new Image();
9    img.onload = function () {
10        var result = (img.width > 0) && (img.height > 0);
11        callback(feature, result);
12    };
13    img.onerror = function () {
14        callback(feature, false);
15    };
16    img.src = "data:image/webp;base64," + kTestImages[feature];
17}
18
19document.addEventListener('lazybeforeunveil', function (e) {
20    var bg = e.target.getAttribute('data-bg');
21    var bgw = e.target.getAttribute('data-bgW');
22    if (bg && !bgw) {
23        e.target.style.backgroundImage = 'url(' + bg + ')';
24    } else if (bgw) {
25        if (window.supportsWebpDetected) {
26            if (window.supportsWebP) {
27                e.target.style.backgroundImage = 'url(' + bgw + ')';
28            } else {
29                e.target.style.backgroundImage = 'url(' + bg + ')';
30            }
31        } else {
32            check_webp_feature('lossy', (feature, status) => {
33                window.supportsWebpDetected = true;
34                window.supportsWebP = status;
35                if (window.supportsWebP) {
36                    e.target.style.backgroundImage = 'url(' + bgw + ')';
37                } else {
38                    e.target.style.backgroundImage = 'url(' + bg + ')';
39                }
40            });
41        }
42    }
43});
44
45document.addEventListener('lazyloaded', function (e) {
46    let _element = $(e.target);
47
48    _element.removeAttr('data-bg');
49    _element.removeAttr('data-bgW');
50    _element.removeAttr('data-src');
51
52    let _picture = _element.closest('picture');
53    if (_picture.length) {
54        _picture.removeAttr('style');
55        _picture.find('[data-src]').removeAttr('data-src');
56        _picture.find('[data-srcset]').removeAttr('data-srcset');
57    }
58});