HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>animation-play-state: paused, running</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    @keyframes slide {
      0% { transform: translateX(0); }
      50% { transform: translateX(120px); }
      100% { transform: translateX(0); }
    }

    @keyframes fade {
      0% { opacity: 1; }
      50% { opacity: 0.25; }
      100% { opacity: 1; }
    }

    .track {
      display: flex;
      align-items: center;
      box-sizing: border-box;
      height: 120px;
      padding: 8px;
      overflow: hidden;
      background: #e2e8f0;
      border: 2px dashed #334155;
    }

    .box {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 80px;
      height: 80px;
      background: #1d4ed8;
      color: #fff;
      font-weight: 700;
      animation-name: slide, fade;
      animation-duration: 2s;
      animation-iteration-count: infinite;
      animation-play-state: paused, running;
    }
  </style>
</head>
<body>
  <p><strong>paused, running</strong> pauses <strong>slide</strong> and lets <strong>fade</strong> play. The box fades in place.</p>
  <div class="track">
    <div class="box">Both</div>
  </div>
</body>
</html>

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CSS animation-play-state Property — paused, running