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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/4.0.6/rx.all.js"></script>
  </head>
<body>
<div id="app">
</div>
</body>
</html>
 
Rx.Observable.timer(0, 1000)
  .map(i => `Seconds Elapsed ${i}`)
  .subscribe(text => {
    const $app = document.querySelector('#app');
    $app.textContent = text;
  });
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