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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>SVG animation</title>
</head>
<body>
  <h1>Animated circle</h1>
  <p>The red circle grows and shrinks continuously.</p>

  <svg width="100" height="100" xmlns="http://www.w3.org/2000/svg">
    <circle cx="50" cy="50" r="40" fill="red">
      <animate attributeName="r" from="10" to="40" dur="1s" repeatCount="indefinite"/>
    </circle>
  </svg>
</body>
</html>

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SVG Introduction — SMIL Animation