HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>offset-path: polygon()</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 lap {
      to { offset-distance: 100%; }
    }

    div {
      width: 24px;
      height: 24px;
      background: #2563eb;
      offset-path: polygon(20% 20%, 80% 20%, 80% 80%, 20% 80%);
      offset-rotate: 0deg;
      animation: lap 5s linear infinite;
    }
  </style>
</head>
<body>
  <p><strong>polygon()</strong> builds a closed route from corner points. The marker walks each edge in order.</p>
  <div></div>
</body>
</html>

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CSS offset-path Property — polygon()