MW component: Pure CSS RWD radio input carousel

HTML

              
                <h1>Pure CSS RWD *accessible* radio input carousel</h1>  


<!-- start carousel section -->
<section class="carousel" aria-label="carousel" role="radiogroup" aria-labelledby="radiogroup_title" id="radiogroup">
 <!-- carousel skip link -->
 <a class="carousel__skip-link" href="#skip-link">Skip the Carousel</a> 
  <p id="radiogroup_title" class="carousel_title">Carousel</p><!-- start carousel title -->
  <ol class="carousel__viewport"><!-- start carousel viewport -->
    
    
    
    
    <!-- start radio inputs -->
    <input class="carousel__activator" type="radio" name="carousel" id="1" checked="checked" role="radio" aria-checked="true"/>
    <input class="carousel__activator" type="radio" name="carousel" id="2" role="radio" aria-checked="false"/>
    <input class="carousel__activator" type="radio" name="carousel" id="3" role="radio" aria-checked="false"/>
    <!-- end radio inputs -->
    
    
    
    
    <!-- start carousel prev/next -->
    <div class="carousel__controls">
      <label class="carousel__control carousel__control--backward" for="3" aria-label="Go to slide 3" >Go to slide 3</label>
      <label class="carousel__control carousel__control--forward" for="2" aria-label="Go to slide 2">Go to slide 2</label>
    </div>
    <div class="carousel__controls">
      <label class="carousel__control carousel__control--backward" for="1" aria-label="Go to slide 1">Go to slide 1</label>
      <label class="carousel__control carousel__control--forward" for="3" aria-label="Go to slide 3">Go to slide 3</label>
    </div>
    <div class="carousel__controls">
      <label class="carousel__control carousel__control--backward" for="2" aria-label="Go to slide 2">Go to slide 2</label>
      <label class="carousel__control carousel__control--forward" for="1" aria-label="Go to slide 1">Go to slide 1</label>
    </div><!-- end carousel prev/next -->
     
    
    
    
    <!-- start carousel slide track -->
    <div class="carousel__track">
    
    <!-- start slide 01 -->
    <li id="carousel__slide1" class="carousel__slide" aria-label="slide 1 of 3">
      <div class="carousel__internal">
       
      </div>
    </li><!-- end slide 01 -->
    
    <!-- start slide 02 -->
    <li id="carousel__slide2" class="carousel__slide" aria-label="slide 2 of 3">
      <div class="carousel__internal">
        
      </div>
    </li><!-- end slide 02 -->
    
    <!-- start slide 03 -->
    <li id="carousel__slide3" class="carousel__slide" aria-label="slide 3 of 3">
      <div class="carousel__internal">
        
      </div>
    </li><!-- end slide 03 -->
    
    </div><!-- end carousel slide track -->
    
    
    
    
    <!-- start carousel bullet nav -->
     <aside class="carousel__navigation">
       <ol class="carousel__navigation-list">
         
         <li class="carousel__navigation-item"><a href="#carousel__slide1">
           <label class="carousel__navigation-button" for="1" aria-label="Go to slide 1">1</label></a></li>      
         
         <li class="carousel__navigation-item"><a href="#carousel__slide2">
           <label class="carousel__navigation-button" for="2" aria-label="Go to slide 2">2</label></a></li>
         
         <li class="carousel__navigation-item"><a href="#carousel__slide3"> 
           <label class="carousel__navigation-button" for="3" aria-label="Go to slide 3">3</label></a></li>
         
       </ol> <!-- end carousel bullet nav -->
    </aside><!-- end carousel bullet nav -->
  </ol><!-- end carousel viewport -->
 
 
  
  
  <!-- skip anchor -->
  <div class="carousel__skip-message" id="skip-link"></div>  
</section><!-- end carousel section -->




<h2 style="margin-top: 6rem;">CSS-only Carousel</h2>

<p>This carousel is created with HTML and CSS only. Features;</p>
<ul class="features">
  <li>No auto-play/scroll</li>
  <li>Loop back to start</li>
  <li>Skip content anchor link for screen-readers</li>
  <li>Tab index</li>
  <li>Aria labelling</li>
  <li>Numbered bullet nav for accessibility, bullet nav :hover</li>
  <li>Automated-numbering bullet nav, using CSS counter ~ disabled as pseudo elements may not be accessible for screen-readers</li>
  <li>Styled :focus outline</li>
  <li>Peeking next and previous slides (needs tweaking but possible based on transform: translate)</li>
  <li>:active state on controls & :hover for next/prev buttons (rebuilt as radio group)</li>
  <li>Radio group slider doesn't jump to anchor</li>
  <li>Opacity, position and scale transitions all working</li>
  <li>Radio group left and right navigation, next/prev are mouse select only</li>
</ul> 
<p>
  Desires;</p>
  <ul class="features">
    <li>Draggable with click and drag</li>
    <li>Radio buttons can't work with trackpad scrolling beause they rely on :checked</li>
    <li>Can't link #id URL to specific slides as that ignores :checked and breaks nav?</li>
</ul>

CSS

              
                /* Default styles */
$focus: 2px solid orange;

html {
  scroll-behavior: smooth;
}

body {
  width: 100%;
  margin: 0 auto;
  padding: 10vw;
  font-family: sans-serif;
  background-color: #111;
  color: #fff;
}

* {
  box-sizing: border-box;
  scrollbar-color: transparent transparent; /* thumb and track color */
  scrollbar-width: 0px;
  -ms-overflow-style: none;
}

:focus {
  outline: $focus;
}

.carousel:focus-within {
  outline: $focus;
}

ol, li {
  list-style: none;
  margin: 0;
  padding: 0;
}

ul.features li {
  list-style: disc;
}




/* Hide scrollbars */
.carousel::-webkit-scrollbar {
  width: 0;
  display: none;
}

.carousel::-webkit-scrollbar-track {
  background: transparent;
  display: none;
}

.carousel::-webkit-scrollbar-thumb {
  background: transparent;
  border: none;
  display: none;
}




/* Carousel, slide & track setup */
.carousel {
  position: relative;
  padding-top: 56.25%;
  aspect-ratio: 16 / 9;
  filter: drop-shadow(0 0 10px rgba(0,0,0,0.25));
  perspective: 100px;
  scrollbar-width: none; /* hides in FireFox */
  overflow: hidden;
  display: block;
  border-radius: 12px;
}

.carousel input[type="radio"] {
	opacity: 0;
  z-index: 1000;
  bottom: 50%;
  left: 0;
  position: absolute;
  border: 0;
  outline: 0;
	clip: rect(1px, 1px, 1px, 1px);
	clip-path: inset(50%);
	height: 1px;
	margin: -1px;
	overflow: hidden;
	padding: 0;
	width: 1px;
}

.carousel input[type="radio"]:focus {
  outline: none;
}

.carousel_title {
	width: 0;
	height: 0;
	font-size: 1px;
	line-height: 0;
	text-indent: -9999px;
	padding: 0;
	margin: 0;
	position: absolute;
}

.carousel__viewport {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  margin: 0 auto;
  display: flex;
  overflow-x: hidden;
  counter-reset: item;
  scroll-behavior: smooth;
  scroll-snap-type: x mandatory;
}

.carousel__slide {
  flex: 0 0 95%;
  width: 95%;
  /*margin: 0 0.5%;*/
  border-radius: 12px;
  scroll-behavior: smooth;
  counter-increment: item;
  display: block;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  /*position: absolute;*/
  opacity: 0; /* opacity slide transition */
  transform-origin: center center;
  transition: opacity ease 1200ms 0ms, transform ease 600ms 0ms;
  overflow: hidden;
}

.carousel__slide .carousel__internal {
  background-color: #9201ed;
  width: 100%;
  height: 100%;
}

.carousel__slide:nth-child(even) .carousel__internal {
  background-color: #00f;
}

.carousel__track {
  position: absolute;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-content: center;
  justify-content: flex-start;
  align-items: stretch;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 0;
  margin: 0;
  transition: transform 400ms ease 0ms;
}

.carousel__track .carousel__slide:nth-of-type(1) {
  transform: translateX(calc(0% + 0%)); /* position slide transition */
}

.carousel__track .carousel__slide:nth-of-type(2) {
  transform: translateX(calc(100% + 7.5%)); /* position slide transition */
}

.carousel__track .carousel__slide:nth-of-type(3) {
  transform: translateX(calc(200% + 12.5%)); /* position slide transition */
}

.carousel__slide:before {
  content: counter(item);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  color: #ffffff;
  font-size: 6rem;
}




/* Skip carousel link */
.carousel__skip-link {
  height: 1px;
  overflow: hidden;
  position: absolute;
  top: 0;
  opacity: 0;
  width: 1px;
}

.carousel__skip-link:focus {
  align-items: center;
  background-color: #fff;
  color: #111;
  display: flex;
  font-size: 1rem;
  height: auto;
  justify-content: center;
  opacity: 1;
  text-decoration: underline;
  width: fit-content;
  padding: 1rem;
  z-index: 100;
}




/* Carousel track position change */ 
.carousel__activator:nth-of-type(1):checked ~ .carousel__track, 
.carousel__activator:nth-of-type(1):target ~ .carousel__track {
  transform: translateX(calc(0% + 2.5%)); /* position slide transition */
}

.carousel__activator:nth-of-type(2):checked ~ .carousel__track, 
.carousel__activator:nth-of-type(2):target ~ .carousel__track {
  transform: translateX(-92.5%); /* position slide transition */
}

.carousel__activator:nth-of-type(3):checked ~ .carousel__track, 
.carousel__activator:nth-of-type(3):target ~ .carousel__track {
  transform: translateX(-187.5%); /* position slide transition */
}




/* Carousel slide scale + opacity animation */
.carousel__activator:nth-of-type(1):checked ~ .carousel__track .carousel__slide:nth-of-type(1),
.carousel__activator:nth-of-type(2):checked ~ .carousel__track .carousel__slide:nth-of-type(2),
.carousel__activator:nth-of-type(3):checked ~ .carousel__track .carousel__slide:nth-of-type(3) {
  top: 0;
  left: 0;
  right: 0;
  opacity: 1; /* opacity slide transition */
  animation: scale-in 400ms ease 0ms 1 forwards; /* scale slide transition */
}

.carousel__activator:nth-of-type(1):not(:checked) ~ .carousel__track .carousel__slide:nth-of-type(1),
.carousel__activator:nth-of-type(2):not(:checked) ~ .carousel__track .carousel__slide:nth-of-type(2),
.carousel__activator:nth-of-type(3):not(:checked) ~ .carousel__track .carousel__slide:nth-of-type(3) {
  animation: scale-out 400ms ease 0ms 1 forwards; /* scale slide transition */
}



/* Carousel next/prev controls */
.carousel__controls {
  opacity: 0;
}

.carousel__activator:nth-of-type(1):checked ~ .carousel__controls:nth-of-type(1),
.carousel__activator:nth-of-type(1):target ~ .carousel__controls:nth-of-type(1),
.carousel__activator:nth-of-type(2):checked ~ .carousel__controls:nth-of-type(2),
.carousel__activator:nth-of-type(2):target ~ .carousel__controls:nth-of-type(2),
.carousel__activator:nth-of-type(3):checked ~ .carousel__controls:nth-of-type(3),
.carousel__activator:nth-of-type(3):target ~ .carousel__controls:nth-of-type(3){
  display: block;
  opacity: 1;
}

.carousel__control {
  display: block;
  cursor: pointer;
  position: absolute;
  top: 50%;
  margin: 0;
  width: 3rem;
  height: 3rem;
  transform: translateY(-50%) scale(0.9);
  border-radius: 50%;
  font-size: 0;
  line-height: 0;
  z-index: 100;
  background-color: #fff;
  color: #111;
  text-align: center;
  border: 1px solid #111;
  transform-origin: center center;
  box-shadow: 0 6px 10px 4px rgba(0,0,0,0.25);
  transition: all ease 400ms;
}

.carousel__control:hover, .carousel__control:focus {
  background: #111;
  color: #fff;
  border: 1px solid #fff;
  transform: translateY(-50%) scale(1);
}

.carousel__control:active {
  outline: $focus;
}

.carousel__control--backward:hover:after, .carousel__control--backward:focus:after {
  /*border-color: #fff;*/
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' height='24px' viewBox='0 0 24 24' width='24px' fill='%23fff'%3E%3Cpath d='M0 0h24v24H0V0z' fill='none'/%3E%3Cpath d='M20 11H7.83l5.59-5.59L12 4l-8 8 8 8 1.41-1.41L7.83 13H20v-2z'/%3E%3C/svg%3E");
} 

.carousel__control--forward:hover:after, .carousel__control--forward:focus:after  {
  /*border-color: #fff;*/
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' height='24px' viewBox='0 0 24 24' width='24px' fill='%23fff'%3E%3Cpath d='M0 0h24v24H0V0z' fill='none'/%3E%3Cpath d='M12 4l-1.41 1.41L16.17 11H4v2h12.17l-5.58 5.59L12 20l8-8-8-8z'/%3E%3C/svg%3E");
}

.carousel__control--backward {
  left: -0rem;
}

.carousel__control--forward {
  right: -0rem;
}

.carousel__control--backward:after, .carousel__control--forward:after {
  content: '';
  display: block;
  /*border-style: solid;
  border-color: #111;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  border-radius: 4px;*/
  width: 100%;
  height: 100%;
  background-size: 2rem 2rem;
  background-repeat: no-repeat;
  background-position: center center;
  transform-origin: center center;
  position: absolute; 
}

.carousel__control--backward:after {
  /*border-width: 0 0 4px 4px;
  transform: rotate(45deg) translate(-60%, -10%);*/
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' height='24px' viewBox='0 0 24 24' width='24px' fill='%23111'%3E%3Cpath d='M0 0h24v24H0V0z' fill='none'/%3E%3Cpath d='M20 11H7.83l5.59-5.59L12 4l-8 8 8 8 1.41-1.41L7.83 13H20v-2z'/%3E%3C/svg%3E");
}

.carousel__control--forward:after {
    /*transform: rotate(
225deg) translate(75%, -10%);
    border-width: 0 0 4px 4px;*/
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' height='24px' viewBox='0 0 24 24' width='24px' fill='%23111'%3E%3Cpath d='M0 0h24v24H0V0z' fill='none'/%3E%3Cpath d='M12 4l-1.41 1.41L16.17 11H4v2h12.17l-5.58 5.59L12 20l8-8-8-8z'/%3E%3C/svg%3E");
}




/* Carousel bullet nav */
.carousel__activator:nth-of-type(1):checked ~ .carousel__navigation .carousel__navigation-list .carousel__navigation-item:nth-of-type(1) .carousel__navigation-button,
.carousel__activator:nth-of-type(1):target ~ .carousel__navigation .carousel__navigation-list .carousel__navigation-item:nth-of-type(1) .carousel__navigation-button,
.carousel__activator:nth-of-type(2):checked ~ .carousel__navigation .carousel__navigation-list .carousel__navigation-item:nth-of-type(2) .carousel__navigation-button,
.carousel__activator:nth-of-type(2):target ~ .carousel__navigation .carousel__navigation-list .carousel__navigation-item:nth-of-type(2) .carousel__navigation-button,
.carousel__activator:nth-of-type(3):checked ~ .carousel__navigation .carousel__navigation-list .carousel__navigation-item:nth-of-type(3) .carousel__navigation-button,
.carousel__activator:nth-of-type(3):target ~ .carousel__navigation .carousel__navigation-list .carousel__navigation-item:nth-of-type(3) .carousel__navigation-button {
  background: #fff;
  color: #111;
  border-color: #111;
}

.carousel__activator:nth-of-type(1):checked ~ .carousel__navigation .carousel__navigation-list .carousel__navigation-item:nth-of-type(1) .carousel__navigation-button,
.carousel__activator:nth-of-type(2):checked ~ .carousel__navigation .carousel__navigation-list .carousel__navigation-item:nth-of-type(2) .carousel__navigation-button,
.carousel__activator:nth-of-type(3):checked ~ .carousel__navigation .carousel__navigation-list .carousel__navigation-item:nth-of-type(3) .carousel__navigation-button {
  outline: $focus;
  text-decoration: underline;
}

.carousel__navigation {
  width: 100%;
  position: absolute;
  right: 0;
  bottom: 5%;
  left: 0;
  text-align: center;
  z-index: 100;
}

ol.carousel__navigation-list {
    display: flex;
    flex-direction: row;
    align-content: center;
    justify-content: center;
    align-items: center;
    list-style: none;
    /*counter-reset: custom-counter; */
}

.carousel__navigation-item a {
  text-decoration: none;
}

.carousel__navigation-button {
  display: flex;
  cursor: pointer;
  flex-direction: row;
  align-content: center;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  margin: 0 10px;
  background-color: #111;
  background-clip: content-box;
  border: 1px solid #fff;
  border-radius: 50%;
  font-size: 1rem;
  color: #fff;
  text-decoration: none;
  transition: all ease 400ms;
  box-shadow: 0 6px 10px 4px rgba(0,0,0,0.25);
  /*counter-increment: custom-counter; */
}

.carousel__navigation-button:before {
  /*content: counter(custom-counter); */
}

.carousel__navigation-button:hover, .carousel__navigation-button:focus {
  background: #fff;
  text-decoration: underline;
  text-decoration-color: #111;
  color: #111;
  transform: scale(1.15);
  border: 1px solid #111;
}




/* Scaling animations */
@keyframes scale-in {
  0% {
    transform: scale(0);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes scale-out {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(0);
  }
}

JS

              
                // Forked from @ https://codepen.io/Schepp/pen/WNbQByE and https://codepen.io/jh3y/pen/WwVKLN

// Benefits over other iteration; better animation, doesn't jump to #anchor, next/prev buttons with hover states, proper active state on bullet nav

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