carousel-fade

bootstrap5.css

bootstrap5.css
/* rtl:end:ignore */
.carousel-fade .carousel-item {
  opacity: 0;
  transition-property: opacity;
  transform: none;
}
bootstrap5.css
.carousel-fade .carousel-item.active,
.carousel-fade .carousel-item-next.carousel-item-start,
.carousel-fade .carousel-item-prev.carousel-item-end {
  z-index: 1;
  opacity: 1;
}
bootstrap5.css
.carousel-fade .active.carousel-item-start,
.carousel-fade .active.carousel-item-end {
  z-index: 0;
  opacity: 0;
  transition: opacity 0s 0.6s;
}
bootstrap5.css
@media (prefers-reduced-motion: reduce) {
  .carousel-fade .active.carousel-item-start,
  .carousel-fade .active.carousel-item-end {
    transition: none;
  }
}

html bootstrap5 Sample

js データ属性でフェードトランジションの設定：carousel-fade

  <div class="container">
    <!-- スライドの代わりにフェードトランジションでスライドをアニメーションさせる -->
    <div id="carouselExample" class="carousel slide carousel-fade" data-bs-ride="carousel">
      <ol class="carousel-indicators">
        <li data-bs-target="#carouselExample" data-bs-slide-to="0" class="active"></li>
        <li data-bs-target="#carouselExample" data-bs-slide-to="1"></li>
        <li data-bs-target="#carouselExample" data-bs-slide-to="2"></li>
      </ol>
      <!-- カルーセル部分 -->
      <div class="carousel-inner">
        <!-- First slide -->
        <div class="carousel-item active"> <img class="d-block w-100" alt="img"
            src="https://via.placeholder.com/1600x900/666666/FFFF00/000000?text=First slide">
          <div class="carousel-caption">
            <h5>スライドタイトル1</h5>
            <p>スライドのキャプション3</p>
          </div>
        </div>
        <!-- Second slide -->
        <div class="carousel-item"> <img class="d-block w-100" alt="img"
            src="https://via.placeholder.com/1600x900/665566/FF0000/000000?text=Second slide">
          <div class="carousel-caption">
            <h5>スライドタイトル2</h5>
            <p>スライドのキャプション3</p>
          </div>
        </div>
        <!-- Third slide -->
        <div class="carousel-item"> <img class="d-block w-100" alt="img"
            src="https://via.placeholder.com/1600x900/664466/FFEE00/000000?text=Third slide">
          <div class="carousel-caption">
            <h5>スライドタイトル3</h5>
            <p>スライドのキャプション3</p>
          </div>
        </div>
      </div>
      <!-- 前に戻るアイコン -->
      <a class="carousel-control-prev" href="#carouselExample" role="button" data-bs-slide="prev">
        <span class="carousel-control-prev-icon" aria-hidden="true"></span>
        <span class="visually-hidden">前に戻る</span>
      </a>
      <!-- 次に送るアイコン -->
      <a class="carousel-control-next" href="#carouselExample" role="button" data-bs-slide="next">
        <span class="carousel-control-next-icon" aria-hidden="true"></span>
        <span class="visually-hidden">次に送る</span>
      </a>
    </div>
  </div>