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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setInterval() — basic</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function logMessage() {
      document.getElementById("out").textContent += "Interval elapsed…\n";
    }
    setInterval(logMessage, 2000);
  </script>
</body>
</html>

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JavaScript setInterval() — basic tick (Try It)