Fractal Image Slider With JavaScript And CSS3

A fancy, responsive image slider/carousel with pure JavaScript and CSS3 that automatically loops through a group of images with a fractal sliding animation.

How to use it:

Add images to the slider as these:

<div class="slider">
  <div class="slider__inner">
    <div class="slider__item">
      <img class="slider__image" src="1.jpg" alt="Image 1">
      <img class="slider__image" src="1.jpg" alt="Image 1">
      <img class="slider__image" src="1.jpg" alt="Image 1">
      <img class="slider__image" src="1.jpg" alt="Image 1">
      <img class="slider__image" src="1.jpg" alt="Image 1">
    </div>
    <div class="slider__item">
      <img class="slider__image" src="2.jpg" alt="Image 2">
      <img class="slider__image" src="2.jpg" alt="Image 2">
      <img class="slider__image" src="2.jpg" alt="Image 2">
      <img class="slider__image" src="2.jpg" alt="Image 2">
      <img class="slider__image" src="2.jpg" alt="Image 2">
    </div>
    <div class="slider__item">
      <img class="slider__image" src="3.jpg" alt="Image 3">
      <img class="slider__image" src="3.jpg" alt="Image 3">
      <img class="slider__image" src="3.jpg" alt="Image 3">
      <img class="slider__image" src="3.jpg" alt="Image 3">
      <img class="slider__image" src="3.jpg" alt="Image 3">
    </div>
  </div>
</div>

The main CSS/CSS3 styles.

.slider {
  overflow: hidden;
}
.slider__inner {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  transform: translateX(var(--slider-offset));
  transition-property: transform;
  transition-duration: var(--slider-time);
  transition-timing-function: ease;
  will-change: transform;
}
.slider__item {
  flex: 1 0 100%;
  box-sizing: border-box;
  position: relative;
  width: 100%;
  height: auto;
}

.slider__image {
  width: 100%;
  height: auto;
  transform: translateX(0);
  animation-delay: var(--slide-distortion-delay), var(--slide-reset-delay);
  animation-duration: var(--slide-distortion-time), var(--slide-reset-time);
  animation-fill-mode: forwards, forwards;
  animation-direction: normal, reverse;
}
.slider__image:not(:first-child) {
  position: absolute;
  top: 0;
  left: 0;
}
.slider__image:nth-child(1) {
  clip-path: inset(0 0 calc(var(--rate) * 4) 0);
}
.slider__image:nth-child(2) {
  clip-path: inset(calc(var(--rate) * 1) 0 calc(var(--rate) * 3) 0);
}
.slider__image:nth-child(3) {
  clip-path: inset(calc(var(--rate) * 2) 0 calc(var(--rate) * 2) 0);
}
.slider__image:nth-child(4) {
  clip-path: inset(calc(var(--rate) * 3) 0 calc(var(--rate) * 1) 0);
}
.slider__image:nth-child(5) {
  clip-path: inset(calc(var(--rate) * 4) 0 0 0);
}

The primary CSS3 animations.

.slider__item--animating .slider__image:nth-child(1) {
  animation-name: animation-1, animation-1;
}
.slider__item--animating .slider__image:nth-child(2) {
  animation-name: animation-2, animation-2;
}
.slider__item--animating .slider__image:nth-child(3) {
  animation-name: animation-3, animation-3;
}
.slider__item--animating .slider__image:nth-child(4) {
  animation-name: animation-4, animation-4;
}
.slider__item--animating .slider__image:nth-child(5) {
  animation-name: animation-5, animation-5;
}
@keyframes animation-1 {
  from {
    transform: translateX(0);
  }
  to {
    // transform: translateX(-50px);
    transform: translateX(-5vw);
  }
}
@keyframes animation-2 {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-3vw);
  }
}
@keyframes animation-3 {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(1vw);
  }
}
@keyframes animation-4 {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(3vw);
  }
}
@keyframes animation-5 {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-1vw);
  }
}
@keyframes slide {
  to {
    transform: translateX(-100%);
  }
}

The main JavaScript to enable the slider.

const ANIMATING_CLASS = 'slider__item--animating';
const Slider = {
  init() {
    this.sliderEl = document.querySelector('.slider');
    this.slideInnerEl = document.querySelector('.slider__inner');
    this.sliderItemsEl = document.querySelectorAll('.slider__item');
    this.offset = 0;
    this.direction = 'left';
    this.maxOffset = (this.sliderItemsEl.length - 1) * 100;
    this.slideInnerEl.addEventListener('transitionend', this.onSliderTransitionEnd.bind(this));
    setInterval(this.slide.bind(this), 3000);
  },
  slide() {
    if (this.isMaxLeft()) {
      this.direction = 'right';
    } else if (this.isMaxRight()) {
      this.direction = 'left';
    }
    this.moveSlider();
  },
  isMaxLeft() {
    return this.offset <= -this.maxOffset;
  },
  isMaxRight() {
    return this.offset >= 0;
  },
  getCurrentPage() {
    if (this.offset < 0) {
      return (this.offset * -1) / 100;
    }
    return this.offset / 100;
  },
  getSignal() {
    return this.direction === 'left' ? -1 : 1;
  },
  onSliderTransitionEnd() {
    const signal = this.getSignal();
    const currentPage = this.getCurrentPage();
    this.sliderItemsEl.forEach(element => element.classList.remove(ANIMATING_CLASS));
  },
  moveSlider() {
    const signal = this.getSignal();
    const currentPage = this.getCurrentPage();
    this.offset = this.offset + (signal * 100);
    this.sliderItemsEl[currentPage].classList.add(ANIMATING_CLASS);
    this.sliderItemsEl[currentPage + (-1 * signal)].classList.add(ANIMATING_CLASS);
    this.slideInnerEl.style.setProperty('--slider-offset', `${this.offset}%`);
  }
};
const slider = Object.create(Slider);
slider.init();