HTML Code

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

    div {
      width: 40px;
      height: 24px;
      background: #2563eb;
      offset: path("M 20 80 L 280 80") 0% 0deg / center;
      animation: travel 4s linear infinite;
    }
  </style>
</head>
<body>
  <p>The slash starts the anchor. <strong>/ center</strong> pins the middle of the box to the path.</p>
  <div></div>
</body>
</html>

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CSS offset Property — anchor