Thanks for your answer.
Yes, that example may be very specific and so not  fore core, but:

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="http://prototypejs.org/assets/
2009/3/27/prototype.js"></script>
<script type="text/javascript">// <![CDATA[

document.observe('dom:loaded',function(){

  (function (){
    $$('body')[0].update('<a id="ups">asd</a>');

        (function(){
          var u = $('ups');
          if(u==null)
            alert('ups...');
        }).defer();
  }).delay(1);

  setInterval(function(){
    $$('body')[0].update('');
  },1);

});

// ]]></script>
</head>
<body>
</body>
</html>
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