HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>animation-name: initial</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(80px); }
      100% { transform: translateX(0); }
    }

    .row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .card {
      flex: 1 1 220px;
    }

    .label {
      margin: 0 0 8px;
      font-weight: 700;
    }

    .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;
      animation-duration: 2s;
      animation-iteration-count: infinite;
    }

    .reset {
      animation-name: initial;
    }
  </style>
</head>
<body>
  <p>Both boxes start from <strong>slide</strong>. <strong>initial</strong> sets the second name back to <strong>none</strong>.</p>
  <div class="row">
    <div class="card">
      <p class="label">animation-name: slide</p>
      <div class="track"><div class="box">Slide</div></div>
    </div>
    <div class="card">
      <p class="label">animation-name: initial</p>
      <div class="track"><div class="box reset">Initial</div></div>
    </div>
  </div>
</body>
</html>

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CSS animation-name Property — initial