https://imaldimexico.com/assets/js/Imaldi/bold-and-bright.js

1(function() {
2  "use strict"; // Start of use strict
3
4  function initParallax() {
5
6    if (!('requestAnimationFrame' in window)) return;
7    if (/Mobile|Android/.test(navigator.userAgent)) return;
8
9    var parallaxItems = document.querySelectorAll('[data-bss-parallax]');
10
11    if (!parallaxItems.length) return;
12
13    var defaultSpeed = 0.5;
14    var visible = [];
15    var scheduled;
16
17    window.addEventListener('scroll', scroll);
18    window.addEventListener('resize', scroll);
19
20    scroll();
21
22    function scroll() {
23
24      visible.length = 0;
25
26      for (var i = 0; i < parallaxItems.length; i++) {
27        var rect = parallaxItems[i].getBoundingClientRect();
28        var speed = parseFloat(parallaxItems[i].getAttribute('data-bss-parallax-speed'), 10) || defaultSpeed;
29
30        if (rect.bottom > 0 && rect.top < window.innerHeight) {
31          visible.push({
32            speed: speed,
33            node: parallaxItems[i]
34          });
35        }
36
37      }
38
39      cancelAnimationFrame(scheduled);
40
41      if (visible.length) {
42        scheduled = requestAnimationFrame(update);
43      }
44
45    }
46
47    function update() {
48
49      for (var i = 0; i < visible.length; i++) {
50        var node = visible[i].node;
51        var speed = visible[i].speed;
52
53        node.style.transform = 'translate3d(0, ' + (-window.scrollY * speed) + 'px, 0)';
54      }
55
56    }
57  }
58
59  initParallax();
60})(); // End of use strict
61