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<!DOCTYPE html>
<html>
<head>
<meta name="description" content="35 - Eventos" />
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<h1>Hola Eventos</h1>
  <p><a href="http://es.wikipedia.org/wiki/Batman">Batman</a> Forever</p>
  <button>Normal</button>
  <button>Contrario</button> 
</body>
</html>
 
(function() {
  var botones = document.getElementsByTagName("button");
  for (var i=0, len=botones.length; i<len; i=i+1) {
    botones[i].onclick = function() {
      var className = this.innerHTML.toLowerCase();
      document.body.className = className;
    };
    // botones[i].onclick = function() {};
  }
}());
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