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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>First 10 seconds...</title>
<style>
  #banner {
    background-color: blue;
    color: white;
    font-weight: bold;
  }
  
  body.first10 p.foo {
      color: blue;
  }
  
  body.notfirst10 #banner {
      display: none;
  }
</style>
</head>
<body class="first10">
  <div id="banner">This is the banner</div>
  <p class="foo">This is a 'foo' paragraph</p>
  <p>This is not a 'foo' paragraph</p>
  <script>
  setTimeout(function() {
      document.body.className =
          document.body.className.replace(/\bfirst10\b/, '') +
          " notfirst10";
  }, 10000); // 10000ms = 10 seconds
  </script>
</body>
</html>
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