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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>Example</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
  body {
    font-family: sans-serif;
  }
</style>
</head>
<body>
  <div id="target" data-foo="bar"></div>
</body>
</html>
 
​
 
jQuery(function($) {
  
  var target = $("#target");
  display("data('foo'): " + target.data("foo"));
  display("data-foo: " + target.attr("data-foo"));
  display("Setting data('foo')");
  target.data("foo", "updated data('foo')");
  display("data('foo'): " + target.data("foo"));
  display("data-foo: " + target.attr("data-foo"));
  display("Setting data-foo");
  target.attr("data-foo", "updated data-foo");
  display("data('foo'): " + target.data("foo"));
  display("data-foo: " + target.attr("data-foo"));
  
  function display(msg) {
    $("<p>").html(msg).appendTo(document.body);
  }
});
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