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Estructura HTML de la animación de carga CSS

HTML

<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
  <title>Andev Web</title>
  <link rel='stylesheet' href='https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.8.1/css/all.min.css'>
<link rel='stylesheet' href='https://fonts.googleapis.com/css?family=Montserrat&display=swap"rel="stylesheet'><link rel="stylesheet" href="./style.css">

</head>
<body>
<div class="app">

<div class="infoList">
		<div class="info__wrapper">
			<div class="info current--info">
				<h1 class="text name">Christ the <br> Redeemer</h1>
				<h4 class="text location">Rio de Janeiro</h4>
				<p class="text description">Iconic symbol of Brazil</p>
			</div>
	
			<div class="info next--info">
				<h1 class="text name">Pyramids of <br>Teotihuacan</h1>
				<h4 class="text location">Mexico</h4>
				<p class="text description">Architectural wonder of ancient Mesoamerica</p>
			</div>
	
			<div class="info previous--info">
				<h1 class="text name">Machu Picchu</h1>
				<h4 class="text location">Peru</h4>
				<p class="text description">Lost city of the Incas</p>
			</div>
		</div>
	</div>

<div class="loading__wrapper">
	<div class="loader--text">Loading...</div>
	<div class="loader">
		<span></span>
	</div>
</div>

<script src='https://unpkg.com/imagesloaded@4/imagesloaded.pkgd.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/gsap/3.3.3/gsap.min.js'></script><script  src="./script.js"></script>

</body>
</html>

CSS

@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@500;600;700;800&display=swap");
:root {
  --card-width: 200px;
  --card-height: 300px;
  --card-transition-duration: 800ms;
  --card-transition-easing: ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(0, 0, 0, 0.787);
  overflow: hidden;
}

button {
  border: none;
  background: none;
  cursor: pointer;
}
button:focus {
  outline: none;
  border: none;
}

.app {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.app__bg {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: -5;
  filter: blur(8px);
  pointer-events: none;
  user-select: none;
  overflow: hidden;
}
.app__bg::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: #000;
  z-index: 1;
  opacity: 0.8;
}
.app__bg__image {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) translateX(var(--image-translate-offset, 0));
  width: 180%;
  height: 180%;
  transition: transform 1000ms ease, opacity 1000ms ease;
  overflow: hidden;
}
.app__bg__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.app__bg__image.current--image {
  opacity: 1;
  --image-translate-offset: 0;
}
.app__bg__image.previous--image, .app__bg__image.next--image {
  opacity: 0;
}
.app__bg__image.previous--image {
  --image-translate-offset: -25%;
}
.app__bg__image.next--image {
  --image-translate-offset: 25%;
}

.cardList {
  position: absolute;
  width: calc(3 * var(--card-width));
  height: auto;
}
.cardList__btn {
  --btn-size: 35px;
  width: var(--btn-size);
  height: var(--btn-size);
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
}
.cardList__btn.btn--left {
  left: -5%;
}
.cardList__btn.btn--right {
  right: -5%;
}
.cardList__btn .icon {
  width: 100%;
  height: 100%;
}
.cardList__btn .icon svg {
  width: 100%;
  height: 100%;
}
.cardList .cards__wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  perspective: 1000px;
}

.card {
  --card-translateY-offset: 100vh;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) translateX(var(--card-translateX-offset)) translateY(var(--card-translateY-offset)) rotateY(var(--card-rotation-offset)) scale(var(--card-scale-offset));
  display: inline-block;
  width: var(--card-width);
  height: var(--card-height);
  transition: transform var(--card-transition-duration) var(--card-transition-easing);
  user-select: none;
}
.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: #000;
  z-index: 1;
  transition: opacity var(--card-transition-duration) var(--card-transition-easing);
  opacity: calc(1 - var(--opacity));
}
/*Andev Web*/
.card__image {
  position: relative;
  width: 100%;
  height: 100%;
}
.card__image img {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.card.current--card {
  --current-card-rotation-offset: 0;
  --card-translateX-offset: 0;
  --card-rotation-offset: var(--current-card-rotation-offset);
  --card-scale-offset: 1.2;
  --opacity: 0.8;
}
.card.previous--card {
  --card-translateX-offset: calc(-1 * var(--card-width) * 1.1);
  --card-rotation-offset: 25deg;
}
.card.next--card {
  --card-translateX-offset: calc(var(--card-width) * 1.1);
  --card-rotation-offset: -25deg;
}
.card.previous--card, .card.next--card {
  --card-scale-offset: 0.9;
  --opacity: 0.4;
}

.infoList {
  position: absolute;
  width: calc(3 * var(--card-width));
  height: var(--card-height);
  pointer-events: none;
}
.infoList .info__wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: flex-start;
  align-items: flex-end;
  perspective: 1000px;
  transform-style: preserve-3d;
}

.info {
  margin-bottom: calc(var(--card-height) / 8);
  margin-left: calc(var(--card-width) / 1.5);
  transform: translateZ(2rem);
  transition: transform var(--card-transition-duration) var(--card-transition-easing);
}
.info .text {
  position: relative;
  font-family: "Montserrat";
  font-size: calc(var(--card-width) * var(--text-size-offset, 0.2));
  white-space: nowrap;
  color: #fff;
  width: fit-content;
}
.info .name,
.info .location {
  text-transform: uppercase;
}
.info .location {
  font-weight: 800;
}
.info .location {
  --mg-left: 40px;
  --text-size-offset: 0.12;
  font-weight: 600;
  margin-left: var(--mg-left);
  margin-bottom: calc(var(--mg-left) / 2);
  padding-bottom: 0.8rem;
}
.info .location::before, .info .location::after {
  content: "";
  position: absolute;
  background: #fff;
  left: 0%;
  transform: translate(calc(-1 * var(--mg-left)), -50%);
}
.info .location::before {
  top: 50%;
  width: 20px;
  height: 5px;
}
.info .location::after {
  bottom: 0;
  width: 60px;
  height: 2px;
}
.info .description {
  --text-size-offset: 0.065;
  font-weight: 500;
}
.info.current--info {
  opacity: 1;
  display: block;
}
.info.previous--info, .info.next--info {
  opacity: 0;
  display: none;
}

.loading__wrapper {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: #000;
  z-index: 200;
}
.loading__wrapper .loader--text {
  color: #fff;
  font-family: "Montserrat";
  font-weight: 500;
  margin-bottom: 1.4rem;
}
.loading__wrapper .loader {
  position: relative;
  width: 200px;
  height: 2px;
  background: rgba(255, 255, 255, 0.25);
}
.loading__wrapper .loader span {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: red;
  transform: scaleX(0);
  transform-origin: left;
}

@media only screen and (min-width: 800px) {
  :root {
    --card-width: 250px;
    --card-height: 400px;
  }
}
.support {
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 10px;
  display: flex;
}
.support a {
  margin: 0 10px;
  color: #fff;
  font-size: 1.8rem;
  backface-visibility: hidden;
  transition: all 150ms ease;
}
.support a:hover {
  transform: scale(1.1);
}

JS

console.clear();

const { gsap, imagesLoaded } = window;

const buttons = {
	prev: document.querySelector(".btn--left"),
	next: document.querySelector(".btn--right"),
};
const cardsContainerEl = document.querySelector(".cards__wrapper");
const appBgContainerEl = document.querySelector(".app__bg");

const cardInfosContainerEl = document.querySelector(".info__wrapper");

buttons.next.addEventListener("click", () => swapCards("right"));

buttons.prev.addEventListener("click", () => swapCards("left"));

function swapCards(direction) {
	const currentCardEl = cardsContainerEl.querySelector(".current--card");
	const previousCardEl = cardsContainerEl.querySelector(".previous--card");
	const nextCardEl = cardsContainerEl.querySelector(".next--card");

const currentBgImageEl = appBgContainerEl.querySelector(".current--image");
	const previousBgImageEl = appBgContainerEl.querySelector(".previous--image");
	const nextBgImageEl = appBgContainerEl.querySelector(".next--image");

changeInfo(direction);
	swapCardsClass();

removeCardEvents(currentCardEl);

function swapCardsClass() {
		currentCardEl.classList.remove("current--card");
		previousCardEl.classList.remove("previous--card");
		nextCardEl.classList.remove("next--card");

currentBgImageEl.classList.remove("current--image");
		previousBgImageEl.classList.remove("previous--image");
		nextBgImageEl.classList.remove("next--image");

currentCardEl.style.zIndex = "50";
		currentBgImageEl.style.zIndex = "-2";

if (direction === "right") {
			previousCardEl.style.zIndex = "20";
			nextCardEl.style.zIndex = "30";

nextBgImageEl.style.zIndex = "-1";

currentCardEl.classList.add("previous--card");
			previousCardEl.classList.add("next--card");
			nextCardEl.classList.add("current--card");

currentBgImageEl.classList.add("previous--image");
			previousBgImageEl.classList.add("next--image");
			nextBgImageEl.classList.add("current--image");
		} else if (direction === "left") {
			previousCardEl.style.zIndex = "30";
			nextCardEl.style.zIndex = "20";

previousBgImageEl.style.zIndex = "-1";

currentCardEl.classList.add("next--card");
			previousCardEl.classList.add("current--card");
			nextCardEl.classList.add("previous--card");

currentBgImageEl.classList.add("next--image");
			previousBgImageEl.classList.add("current--image");
			nextBgImageEl.classList.add("previous--image");
		}
	}
}

function changeInfo(direction) {
	let currentInfoEl = cardInfosContainerEl.querySelector(".current--info");
	let previousInfoEl = cardInfosContainerEl.querySelector(".previous--info");
	let nextInfoEl = cardInfosContainerEl.querySelector(".next--info");

gsap.timeline()
		.to([buttons.prev, buttons.next], {
		duration: 0.2,
		opacity: 0.5,
		pointerEvents: "none",
	})
		.to(
		currentInfoEl.querySelectorAll(".text"),
		{
			duration: 0.4,
			stagger: 0.1,
			translateY: "-120px",
			opacity: 0,
		},
		"-="
	)
		.call(() => {
		swapInfosClass(direction);
	})
		.call(() => initCardEvents())
		.fromTo(
		direction === "right"
		? nextInfoEl.querySelectorAll(".text")
		: previousInfoEl.querySelectorAll(".text"),
		{
			opacity: 0,
			translateY: "40px",
		},
		{
			duration: 0.4,
			stagger: 0.1,
			translateY: "0px",
			opacity: 1,
		}
	)
		.to([buttons.prev, buttons.next], {
		duration: 0.2,
		opacity: 1,
		pointerEvents: "all",
	});

function swapInfosClass() {
		currentInfoEl.classList.remove("current--info");
		previousInfoEl.classList.remove("previous--info");
		nextInfoEl.classList.remove("next--info");

if (direction === "right") {
			currentInfoEl.classList.add("previous--info");
			nextInfoEl.classList.add("current--info");
			previousInfoEl.classList.add("next--info");
		} else if (direction === "left") {
			currentInfoEl.classList.add("next--info");
			nextInfoEl.classList.add("previous--info");
			previousInfoEl.classList.add("current--info");
		}
	}
}

function initCardEvents() {
	const currentCardEl = cardsContainerEl.querySelector(".current--card");
	currentCardEl.addEventListener("pointermove", updateCard);
	currentCardEl.addEventListener("pointerout", (e) => {
		resetCardTransforms(e);
	});
}

initCardEvents();

function removeCardEvents(card) {
	card.removeEventListener("pointermove", updateCard);
}

function init() {

let tl = gsap.timeline();

tl.to(cardsContainerEl.children, {
		delay: 0.15,
		duration: 0.5,
		stagger: {
			ease: "power4.inOut",
			from: "right",
			amount: 0.1,
		},
		"--card-translateY-offset": "0%",
	})
		.to(cardInfosContainerEl.querySelector(".current--info").querySelectorAll(".text"), {
		delay: 0.5,
		duration: 0.4,
		stagger: 0.1,
		opacity: 1,
		translateY: 0,
	})
		.to(
		[buttons.prev, buttons.next],
		{
			duration: 0.4,
			opacity: 1,
			pointerEvents: "all",
		},
		"-=0.4"
	);
}

const waitForImages = () => {
	const images = [...document.querySelectorAll("img")];
	const totalImages = images.length;
	let loadedImages = 0;
	const loaderEl = document.querySelector(".loader span");

gsap.set(cardsContainerEl.children, {
		"--card-translateY-offset": "100vh",
	});
	gsap.set(cardInfosContainerEl.querySelector(".current--info").querySelectorAll(".text"), {
		translateY: "40px",
		opacity: 0,
	});
	gsap.set([buttons.prev, buttons.next], {
		pointerEvents: "none",
		opacity: "0",
	});

images.forEach((image) => {
		imagesLoaded(image, (instance) => {
			if (instance.isComplete) {
				loadedImages++;
				let loadProgress = loadedImages / totalImages;

gsap.to(loaderEl, {
					duration: 1,
					scaleX: loadProgress,
					backgroundColor: `hsl(${loadProgress * 120}, 100%, 50%`,
				});

if (totalImages == loadedImages) {
					gsap.timeline()
						.to(".loading__wrapper", {
						duration: 0.8,
						opacity: 0,
						pointerEvents: "none",
					})
						.call(() => init());
				}
			}
		});
	});
};

waitForImages();

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Estructura HTML de la animación de carga CSS

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