SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<div class="selector">Click me!</div>

JavaScript

$('.selector').click(function(){
  var obj = $(this),
      repl = $('<div class="size">whats up man ??! <span class="medium"></span></div>');
  obj.replaceWith(repl);
  alert(repl.find('span').attr('class')); //this will print 'undefined'
});