progress-bar-animated

bootstrap5.css

.progress-bar-animated {
  -webkit-animation: progress-bar-stripes 1s linear infinite;
  animation: progress-bar-stripes 1s linear infinite;
}

bootstrap5.css

@media (prefers-reduced-motion: reduce) {
  .progress-bar-animated {
    -webkit-animation: none;
    animation: none;
  }
}

html bootstrap5 Sample

プログレスバーのアニメーションさせる：progress-bar-animated

  <div class="progress mb-3">
    <div class="progress-bar progress-bar-striped progress-bar-animated" role="progressbar" aria-valuenow="25"
      aria-valuemin="0" aria-valuemax="100" style="width: 25%"></div>
  </div>
  <div class="progress mb-3">
    <div class="progress-bar progress-bar-striped progress-bar-animated bg-success" role="progressbar"
      aria-valuenow="50" aria-valuemin="0" aria-valuemax="100" style="width: 50%"></div>
  </div>
  <div class="progress mb-3">
    <div class="progress-bar progress-bar-striped progress-bar-animated bg-info" role="progressbar" aria-valuenow="75"
      aria-valuemin="0" aria-valuemax="100" style="width: 75%"></div>
  </div>
  <div class="progress mb-3">
    <div class="progress-bar progress-bar-striped progress-bar-animated bg-danger" role="progressbar"
      aria-valuenow="100" aria-valuemin="0" aria-valuemax="100" style="width: 100%"></div>
  </div>