<main class="Main">
  <h1>Mostly CSS Responsive Carousel</h1>
  
  <section class="Carousel" id="carousel" tabindex="-1">
    <h2 class="Hidden">Carousel</h2>
    <article class="Card Card--overlay Card--square" id="card-1">
      <div class="Card__media">
        <img class="Card__image" alt="Card image description" width="480" height="480" loading="lazy" src="https://images.unsplash.com/photo-1621160471147-c5be030e199b?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYyMzMxMTEzMw&ixlib=rb-1.2.1&q=85&height=480">
      </div>
      <div class="Card__main">
        <h2 class="Card__heading"><a class="Card__link" href="#">Prefer 1/1 aspect ratio</a></h2>
        <p>This is a generic card pattern.</p>
      </div>
    </article>
    <!--/Card-->
    <article class="Card Card--overlay Card--wide" id="card-2">
      <div class="Card__media">
        <img class="Card__image" alt="Card image description" width="720" height="480" loading="lazy" src="https://images.unsplash.com/photo-1493246507139-91e8fad9978e?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYyMzMxMTE5MA&ixlib=rb-1.2.1&q=85&height=480">
      </div>
      <div class="Card__main">
        <h2 class="Card__heading"><a class="Card__link" href="#">Prefer 16/9 aspect ratio</a></h2>
        <p>This is a generic card pattern.</p>
      </div>
    </article>
    <!--/Card-->
    <article class="Card Card--overlay Card--portrait" id="card-3">
      <div class="Card__media">
        <img class="Card__image" alt="Card image description" width="360" height="480" loading="lazy" src="https://images.unsplash.com/photo-1621131179929-426cfb7ce409?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYyMzMxMTAzNw&ixlib=rb-1.2.1&q=85&height=480">
      </div>
      <div class="Card__main">
        <h2 class="Card__heading"><a class="Card__link" href="#">Prefer 3/4 aspect ratio</a></h2>
        <p>This is a generic card pattern.</p>
      </div>
    </article>
    <!--/Card-->
    <article class="Card Card--overlay Card--photo" id="card-4">
      <div class="Card__media">
        <img class="Card__image" alt="Card image description" width="708" height="480" loading="lazy" src="https://images.unsplash.com/photo-1622176835604-e644073b0eab?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYyMzMxMTA3OQ&ixlib=rb-1.2.1&q=85&height=480">
      </div>
      <div class="Card__main">
        <h2 class="Card__heading"><a class="Card__link" href="#">Prefer 4/3 aspect ratio</a></h2>
        <p>This is a generic card pattern.</p>
      </div>
    </article>
    <!--/Card-->
    <article class="Card Card--overlay Card--square" id="card-5">
      <div class="Card__media">
        <img class="Card__image" alt="Card image description" width="480" height="480" loading="lazy" src="https://images.unsplash.com/photo-1622987437805-5c6f7c2609d7?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYyMzMxOTA3NA&ixlib=rb-1.2.1&q=85&height=480">
      </div>
      <div class="Card__main">
        <h2 class="Card__heading"><a class="Card__link" href="#">Prefer 1/1 aspect ratio</a></h2>
        <p>This is a generic card pattern.</p>
      </div>
    </article>
    <!--/Card-->
    <article class="Card Card--overlay Card--wide" id="card-6">
      <div class="Card__media">
        <img class="Card__image" alt="Card image description" width="720" height="480" loading="lazy" src="https://images.unsplash.com/photo-1607935911096-f31f85819be7?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYyMzMyNTI1NA&ixlib=rb-1.2.1&q=85&height=480">
      </div>
      <div class="Card__main">
        <h2 class="Card__heading"><a class="Card__link" href="#">Prefer 16/9 aspect ratio</a></h2>
        <p>This is a generic card pattern.</p>
      </div>
    </article>
    <!--/Card-->
    <article class="Card Card--overlay Card--portrait" id="card-7">
      <div class="Card__media">
        <img class="Card__image" alt="Card image description" width="360" height="480" loading="lazy" src="https://images.unsplash.com/photo-1622595522218-f318265a40f4?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYyMzMxOTE1Ng&ixlib=rb-1.2.1&q=85&height=480">
      </div>
      <div class="Card__main">
        <h2><a class="Card__link" href="#">Prefer 3/4 aspect ratio</a></h2>
        <p>This is a generic card pattern.</p>
      </div>
    </article>
    <!--/Card-->
    <article class="Card Card--overlay Card--photo" id="card-8">
      <div class="Card__media">
        <img class="Card__image" alt="Card image description" width="708" height="480" loading="lazy" src="https://images.unsplash.com/photo-1621045246196-4c7ce9092d3a?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYyMzMxOTIyOQ&ixlib=rb-1.2.1&q=85&height=480">
      </div>
      <div class="Card__main">
        <h2><a class="Card__link" href="#">Prefer 4/3 aspect ratio</a></h2>
        <p>This is a generic card pattern.</p>
      </div>
    </article>
    <!--/Card-->
  </section>
  <!--/Carousel-->
  
  <nav class="Pagination">
    <h2 class="Hidden">Carousel Navigation</h2>
    <button class="Arrow" type="button" aria-controls="carousel" disabled>
      <svg width="16" height="16" viewBox="0 0 16 16" role="presentation">
        <path fill-rule="evenodd" d="M1 8a7 7 0 1 0 14 0A7 7 0 0 0 1 8zm15 0A8 8 0 1 1 0 8a8 8 0 0 1 16 0zm-4.5-.5a.5.5 0 0 1 0 1H5.707l2.147 2.146a.5.5 0 0 1-.708.708l-3-3a.5.5 0 0 1 0-.708l3-3a.5.5 0 1 1 .708.708L5.707 7.5H11.5z"/>
      </svg>
      <span class="Hidden">Previous slide</span>
    </button>
    <button class="Arrow" type="button" aria-controls="carousel" disabled>
      <svg width="16" height="16" viewBox="0 0 16 16" role="presentation">
        <path fill-rule="evenodd" d="M1 8a7 7 0 1 0 14 0A7 7 0 0 0 1 8zm15 0A8 8 0 1 1 0 8a8 8 0 0 1 16 0zM4.5 7.5a.5.5 0 0 0 0 1h5.793l-2.147 2.146a.5.5 0 0 0 .708.708l3-3a.5.5 0 0 0 0-.708l-3-3a.5.5 0 1 0-.708.708L10.293 7.5H4.5z"/>
      </svg>
      <span class="Hidden">Next slide</span>
    </button>
    <div class="Dots">
      <a href="#card-1" class="Dot" tabindex="-1"><span class="Hidden">Slide 1</span></a>
      <a href="#card-2" class="Dot" tabindex="-1"><span class="Hidden">Slide 2</span></a>
      <a href="#card-3" class="Dot" tabindex="-1"><span class="Hidden">Slide 3</span></a>
      <a href="#card-4" class="Dot" tabindex="-1"><span class="Hidden">Slide 4</span></a>
      <a href="#card-5" class="Dot" tabindex="-1"><span class="Hidden">Slide 5</span></a>
      <a href="#card-6" class="Dot" tabindex="-1"><span class="Hidden">Slide 6</span></a>
      <a href="#card-7" class="Dot" tabindex="-1"><span class="Hidden">Slide 7</span></a>
      <a href="#card-8" class="Dot" tabindex="-1"><span class="Hidden">Slide 8</span></a>
    </div>
  </nav>
  <!--/Pagination-->
  
  <h2>Features</h2>
  <ul>
    <li>Progressively enhanced (only previous/next buttons require JavaScript)</li>
    <li>Handles focus state and keyboard navigation</li>
    <li>Uses CSS scroll-snap for transitions and touch control</li>
    <li>Respects reduced motion preference</li>
    <li>Aspect ratios are preferred but max-width overrules</li>
    <li>
      <label>
        <input type="checkbox" id="toggle-rtl">
        <span>Supports <abbr title="right-to-left">RTL</abbr> styles</span>
      </label>
    </li>
    <li>
      <label>
        <input type="checkbox" id="toggle-single">
        <span>Single slides</span>
      </label>
    </li>
  </ul>
  <p>Feedback and comments: <a href="https://twitter.com/dbushell" target="_blank">@dbushell</a></p>
  <p>Uses my <a href="https://codepen.io/dbushell/full/MWpzGje" target="_top">“Universal” Card Pattern</a> overlay variation.</p>
  <h2>Known issues</h2>
  <p><b>Safari 14</b> does not support <code>scroll-behavior: smooth;</code> – Solution: polyfill / convince stakeholder the fallback behaviour is acceptable.</p>
  <p><b>Safari 14</b> does not support <code>aspect-ratio</code>.</p>
  <h2>Update for June 2024</h2>
  <p>I've built a <a target="_top" href="https://codepen.io/dbushell/full/NWVwdae">new more accessible carousel</a> using custom elements.</p>
  <footer>
    <p><small>MIT licensed | Copyright © 2021 <a href="https://dbushell.com" target="_blank">David Bushell</a> | <a href="https://twitter.com/dbushell" target="_blank">@dbushell</a>
      <br>SVG from <a href="https://icons.getbootstrap.com" target="_blank">Bootstrap Icons</a></small></p>
  </footer>
</main>
<!--/Main-->
:root {
  --theme-blue: 200, 80%, 38%;
  --theme-red: 350, 63%, 52%;
  --theme-pink: 350, 100%, 69%;
  --theme-black: 0, 7%, 9%;
  --theme-white: 0, 0%, 100%;
  --theme-light: 40, 100%, 97%;
  --theme-dark: 0, 7%, 29%;
  color: hsl(var(--theme-dark));
  background: hsl(var(--theme-light));
}

*,
*::after,
*::before {
  box-sizing: border-box;
}

a {
  color: hsl(var(--theme-blue));
  transition: color 150ms, text-decoration-color 150ms;

  &:active,
  &:visited {
    color: hsl(var(--theme-blue));
  }

  &:hover {
    color: hsl(var(--theme-red));
  }

  &:focus,
  &:hover {
    text-decoration-color: transparent;
  }
}

a,
[tabindex='-1'] {
  &:focus {
    outline: 0.125rem solid hsl(var(--theme-pink));

    &:not(:focus-visible) {
      outline: none;
    }
  }
}

.Carousel {
  --carousel-gap: 1rem;
  border-radius: 1rem;
  display: flex;
  gap: var(--carousel-gap);
  overflow-y: hidden;
  overflow-x: auto;
  position: relative;
  scroll-behavior: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  height: 50vw;
  outline: none !important;
  min-height: 20rem;
  max-height: 30rem;

  &::-webkit-scrollbar {
    display: none;
  }

  .Card {
    aspect-ratio: var(--card-ratio);
    flex: 1 0 auto;
    min-height: 100%;
    scroll-snap-align: start;
  }
  
  .Card__media {
    aspect-ratio: auto;
  }

  & > div:empty {
    position: relative;

    &:first-child {
      inset-inline-start: 10%;
      margin-inline-end: calc(-1 * var(--carousel-gap));
    }

    &:last-child {
      inset-inline-end: 10%;
      margin-inline-start: calc(-1 * var(--carousel-gap));
    }
  }
}

.Carousel--single {
  .Card {
    --card-ratio: auto;
    flex: 1 0 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .Carousel {
    scroll-behavior: auto;
  }
}

// Not a perfect fix but looks better in Safari 14
@supports not (aspect-ratio: 1/1) {
  .Carousel {
    .Card__media {
      padding-block-end: 0 !important;
    }
    
    .Card__image {
      position: relative !important;
    }
  }
}

.Dots {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.Dot {
  border-radius: 100%;
  display: block;
  height: 1.5rem;
  width: 1.5rem;
  position: relative;

  &::after {
    background: currentColor;
    border-radius: 100%;
    content: '';
    display: block;
    height: 0.375rem;
    width: 0.375rem;
    left: 50%;
    position: absolute;
    top: 50%;
    transform: translateX(-50%) translateY(-50%);
  }
}

.Dot--active {
  color: hsl(var(--theme-pink)) !important;
}

.Pagination {
  align-items: center;
  display: flex;
  justify-content: center;
  margin: 1rem -0.5rem;

  .Arrow {
    flex: 0 0 auto;

    &:first-of-type {
      margin-inline-end: auto;
      order: -1;
    }
    &:last-of-type {
      margin-inline-start: auto;
      order: 1;
    }
  }
}

.Arrow {
  align-items: center;
  appearance: none;
  background: transparent;
  border: none;
  border-radius: 0.125rem;
  cursor: pointer;
  color: hsl(var(--theme-blue));
  display: flex;
  height: 3rem;
  justify-content: center;
  opacity: 1;
  padding: 0.5rem;
  transition: opacity 150ms, color 150ms;
  width: 3rem;

  &:hover {
    color: hsl(var(--theme-red));
  }

  &:focus {
    color: hsl(var(--theme-pink));
    outline: none;

    svg {
      box-shadow: 0 0 0 0.125rem hsla(var(--theme-white), 1),
        0 0 0 0.25rem currentColor;
    }

    &:not(:focus-visible) {
      color: hsl(var(--theme-red));
      svg {
        box-shadow: none;
      }
    }
  }

  &[disabled] {
    color: hsl(var(--theme-dark));
    opacity: 0.4;
    pointer-events: none;
  }

  svg {
    border-radius: 100%;
    fill: currentColor;
    height: 100%;
    width: 100%;
    transition: box-shadow 150ms;

    [dir='rtl'] & {
      transform: scaleX(-1);
    }
  }
}

.Hidden {
  border: 0 !important;
  clip: rect(0 0 0 0) !important;
  clip-path: inset(50%) !important;
  height: 1px !important;
  margin: -1px !important;
  overflow: hidden !important;
  padding: 0 !important;
  position: absolute !important;
  width: 1px !important;
  white-space: nowrap !important;
}

// Card pattern
// https://codepen.io/dbushell/full/MWpzGje

:root {
  --card-link-color: var(--theme-blue);
  --card-hover-color: var(--theme-red);
  --card-focus-color: var(--theme-pink);
  --card-inner-focus-color: var(--theme-white);
  --card-shadow-color: var(--theme-black);
  --card-foreground-color: var(--theme-dark);
  --card-background-color: var(--theme-dark);
}

.Card {
  --card-ratio: auto 1/1;
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: [media-start] auto [media-end main-start] auto [main-end];
  max-width: 100%;
  position: relative;
}

.Card__media {
  aspect-ratio: var(--card-ratio);
  background: hsla(var(--card-background-color), 0.5);
  border-radius: 1rem;
  grid-column: 1 / -1;
  grid-row: media-start / media-end;
  max-width: 100%;
  overflow: hidden;
  position: relative;
  z-index: -1;

  & > * {
    border-radius: inherit;
    height: 100%;
    object-fit: cover;
    position: absolute;
    width: 100%;
  }
}

.Card__main {
  align-self: end;
  color: hsl(var(--card-foreground-color));
  grid-column: 1 / -1;
  grid-row: main-start / main-end;
  padding: 1.25rem;

  [href]:not(.Card__link) {
    position: relative;
    z-index: 2;
  }

  & > * {
    margin: 0;
  }
}

.Card__link {
  color: hsl(var(--card-link-color));
  font-weight: 600;
  text-decoration-line: underline;
  text-decoration-color: hsla(var(--card-link-color), 0.2);
  text-decoration-thickness: 0.125rem;
  text-decoration-skip: ink;
  text-decoration-skip-ink: all;
  text-decoration-offset: 100%;

  &::after {
    border: 0.125rem solid hsl(var(--card-focus-color));
    box-shadow: inset 0 0 0 0.125rem hsla(var(--card-inner-focus-color), 1);
    border-radius: 1rem;
    bottom: 0;
    content: '';
    display: block;
    left: 0;
    opacity: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: border-color 150ms, opacity 150ms;
    z-index: 1;
  }

  &:hover,
  &:focus {
    text-decoration-color: hsla(var(--card-hover-color), 1);

    &::after {
      opacity: 1;
    }
  }

  &:focus {
    outline: none;
    text-decoration-color: currentColor;
  }
}

.Card__heading {
  line-height: 1.25;
  margin-block-end: 0.5rem;
}

.Card--border {
  .Card__link {
    &::after {
      opacity: 1;
    }
    
    &:not(:focus):not(:hover) {
      &::after {
        border-color: hsla(var(--card-foreground-color), 0.5);
      }
    }
  }
}

.Card--overlay {
  --card-shadow-color: var(--theme-black);
  --card-foreground-color: var(--theme-white);
  --card-background-color: var(--theme-dark);
  --card-link-color: var(--theme-white);
  --card-hover-color: var(--theme-white);

  grid-template-rows:
    [media-start] 1fr
    [overlay-start] 1rem
    [main-start] auto
    [main-end overlay-end media-end];

  &::before {
    background: linear-gradient(
      to top,
      hsla(var(--card-shadow-color), 0.8) 20%,
      hsla(var(--card-shadow-color), 0.3) 60%,
      transparent
    );
    border-bottom-left-radius: 1rem;
    border-bottom-right-radius: 1rem;
    content: '';
    display: block;
    grid-column: 1 / -1;
    grid-row: overlay-start / overlay-end;
    overflow: hidden;
  }

  .Card__main {
    p {
      text-shadow: 0 0.0625rem 0.0625rem hsl(var(--card-shadow-color));
    }

    a {
      color: hsl(var(--card-link-color));

      &:active,
      &:visited {
        color: hsl(var(--card-link-color));
      }

      &:hover,
      &:focus {
        color: hsl(var(--card-hover-color));
      }
    }
  }
}

.Card--square {
  --card-ratio: auto 1/1;
}

.Card--photo {
  --card-ratio: auto 4/3;
}

.Card--portrait {
  --card-ratio: auto 3/4;
}

.Card--wide {
  --card-ratio: auto 16/9;
}

@supports not (aspect-ratio: 1/1) {
  .Card__media {
    height: 100%;
    padding-block-end: calc(100% * (1 / 1));
  }

  .Card--square {
    .Card__media {
      padding-block-end: calc(100% * (1 / 1));
    }
  }

  .Card--photo {
    .Card__media {
      padding-block-end: calc(100% * (3 / 4));
    }
  }

  .Card--portrait {
    .Card__media {
      padding-block-end: calc(100% * (4 / 3));
    }
  }

  .Card--wide {
    .Card__media {
      padding-block-end: calc(100% * (9 / 16));
    }
  }
}

// Demo styles

@font-face {
  font-family: 'Raleway';
  src: url('https://assets.codepen.io/85421/Raleway-VariableFont.woff2')
    format('woff2');
  font-display: swap;
  font-weight: 1 900;
  font-style: normal;
  unicode-range: U+0020-007F, U+00A0-00FF, U+0100-017F, U+2000-206F;
}

@font-face {
  font-family: 'Fallback';
  size-adjust: 104%;
  ascent-override: 96%;
  src: local('Arial');
}

html {
  line-height: 1.5;
  font-family: Raleway, Fallback, sans-serif;
}

body {
  margin: 0;
}

img {
  display: block;
  height: auto;
  max-width: 100%;
}

.Main {
  margin: 0 auto;
  max-width: calc(90rem + 10vw);
  padding: 1.5rem 5vw;
  width: 100%;

  & > *:first-child {
    margin-block-start: 0;
  }

  & > h1 {
    font-weight: 800;
  }

  & > h1,
  & > h2,
  & > h3 {
    line-height: 1.25;
    margin-block: 1.5rem 1rem;
  }

  & > ul {
    margin-block: 1.5rem;
    padding-inline: 2rem 0;

    li {
      margin-block: 0.5rem;
    }
  }

  & > p {
    margin-block: 1rem;
  }

  a:not([class]) {
    font-weight: 500;
  }
}
View Compiled
(() => {
  // Respect user perference
  const isReducedMotion = window.matchMedia(
    '(prefers-reduced-motion: reduce)'
  ).matches;

  // Helper to apply inline CSS
  const setStyleProps = ($el, styles) => {
    for (const [key, value] of Object.entries(styles)) {
      if (value === false) {
        $el.style.removeProperty(key);
      } else {
        $el.style.setProperty(key, value);
      }
    }
  };

  document.querySelectorAll('.Carousel').forEach(($carousel) => {
    $carousel.scrollLeft = 0;

    const $cards = Array.from($carousel.querySelectorAll('.Card'));
    const $pagination = $carousel.nextElementSibling;
    const [$previous, $next] = $pagination.querySelectorAll('.Arrow');
    $pagination.querySelector('.Dot').classList.add('Dot--active');

    const $start = document.createElement('div');
    const $end = document.createElement('div');
    $carousel.prepend($start);
    $carousel.append($end);

    const observer = new IntersectionObserver((entries) => {
      entries.forEach((entry) => {
        if (entry.target === $start) {
          if ($previous) {
            $previous.disabled = entry.isIntersecting;
          }
        }
        if (entry.target === $end) {
          if ($next) {
            $next.disabled = entry.isIntersecting;
          }
        }
      });
    });
    observer.observe($start);
    observer.observe($end);

    const scrollTo = ($card) => {
      let offset = getOffset($card);
      const left = document.dir === 'rtl' ? -offset : offset;
      const behavior = isReducedMotion ? 'auto' : 'smooth';
      $carousel.scrollTo({left, behavior});
    };

    const getOffset = ($el) => {
      let offset = $el.offsetLeft;
      if (document.dir === 'rtl') {
        offset = $carousel.offsetWidth - (offset + $el.offsetWidth);
      }
      return offset;
    };

    $previous.addEventListener('click', (ev) => {
      ev.preventDefault();
      let $card = $cards[0];
      const scroll = Math.abs($carousel.scrollLeft);
      $cards.forEach(($item) => {
        const offset = getOffset($item);
        if (offset - scroll < -1 && offset > getOffset($card)) {
          $card = $item;
        }
      });
      scrollTo($card);
    });

    $next.addEventListener('click', (ev) => {
      ev.preventDefault();
      let $card = $cards[$cards.length - 1];
      const scroll = Math.abs($carousel.scrollLeft);
      $cards.forEach(($item) => {
        const offset = getOffset($item);
        if (offset - scroll > 1 && offset < getOffset($card)) {
          $card = $item;
        }
      });
      scrollTo($card);
    });

    $pagination.addEventListener('click', (ev) => {
      if (ev.target.classList.contains('Dot')) {
        ev.preventDefault();
        const $card = document.querySelector(new URL(ev.target.href).hash);
        if ($card) scrollTo($card);
      }
    });

    // Highlight nearest "Dot" in pagination
    let scrollTimeout;
    $carousel.addEventListener(
      'scroll',
      () => {
        clearTimeout(scrollTimeout);
        scrollTimeout = setTimeout(() => {
          let $dot = $pagination.querySelector('.Dot--active');
          if ($dot) $dot.classList.remove('Dot--active');
          let $active;
          const scroll = Math.abs($carousel.scrollLeft);
          if (scroll <= 0) {
            $active = $cards[0];
          }
          if (scroll >= $carousel.scrollWidth - $carousel.offsetWidth) {
            $active = $cards[$cards.length - 1];
          }
          if (!$active) {
            let oldDiff;
            $cards.forEach(($card) => {
              const newDiff = Math.abs(scroll - getOffset($card));
              if (!$active || newDiff < oldDiff) {
                $active = $card;
                oldDiff = newDiff;
              }
            });
          }
          $dot = $pagination.querySelector(
            `[href="#${($active ?? $card[0]).id}"]`
          );
          if ($dot) $dot.classList.add('Dot--active');
        }, 50);
      },
      {passive: true}
    );

    // Improve arrow key navigation
    $carousel.addEventListener('keydown', (ev) => {
      if (/^(Arrow)?Left$/.test(ev.key)) {
        ev.preventDefault();
        (document.dir === 'rtl' ? $next : $previous).click();
      } else if (/(Arrow)?Right$/.test(ev.key)) {
        ev.preventDefault();
        (document.dir === 'rtl' ? $previous : $next).click();
      }
    });

    // Improve transition when tabbing focus

    let scrollLeft = 0;
    $carousel.addEventListener(
      'blur',
      (ev) => {
        scrollLeft = $carousel.scrollLeft;
      },
      {capture: true}
    );
    $carousel.addEventListener(
      'focus',
      (ev) => {
        $carousel.scrollLeft = scrollLeft;
        const $card = ev.target.closest('.Card');
        if ($card) scrollTo($card);
      },
      {capture: true}
    );
  });

  // Optional polyfill for Safari 14
  if (!isReducedMotion && !window.CSS.supports('scroll-behavior: smooth')) {
    import('https://cdn.skypack.dev/smoothscroll-polyfill').then((module) => {
      module.polyfill();
    });
  }
})();

(() => {
  // Toggle right-to-left for demo
  document.querySelector('#toggle-rtl').addEventListener('change', (ev) => {
    document.dir = ev.target.checked ? 'rtl' : 'ltr';
    document.querySelectorAll('.Carousel').forEach(($carousel) => {
      $carousel.scrollLeft = 0;
    });
  });

  // Toggle single slides class for demo
  document.querySelector('#toggle-single').addEventListener('change', (ev) => {
    document.querySelectorAll('.Carousel').forEach(($carousel) => {
      $carousel.classList.toggle('Carousel--single', ev.target.checked);
    });
  });
})();

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.