HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>offset-distance animation</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 travel {
      from { offset-distance: 0%; }
      to { offset-distance: 100%; }
    }

    div {
      width: 24px;
      height: 24px;
      background: #2563eb;
      offset-path: path("M 20 80 L 280 80");
      offset-rotate: 0deg;
      animation: travel 4s linear infinite;
    }
  </style>
</head>
<body>
  <p>The path stays fixed. The animation changes <strong>offset-distance</strong> from <code>0%</code> to <code>100%</code>.</p>
  <div></div>
</body>
</html>

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CSS offset-distance Property — animate