HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS offset-path SVG Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 2rem;
    }
    .stage {
      position: relative;
      width: 360px;
      height: 140px;
      border: 1px solid #e2e8f0;
      border-radius: 0.75rem;
      background: #fff;
    }
    @keyframes follow {
      to { offset-distance: 100%; }
    }
    .dot {
      width: 18px;
      height: 18px;
      border-radius: 999px;
      background: #2563eb;
      offset-path: path("M 10,80 Q 95,10 180,80 T 350,80");
      animation: follow 4s ease-in-out infinite alternate;
    }
  </style>
</head>
<body>
  <h1>Dot following a curved path()</h1>
  <div class="stage">
    <div class="dot"></div>
  </div>
</body>
</html>

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CSS offset-path Property - path()