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<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  <div>
    <h2>Lorem ipsum</h2>
    <p>Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. <em>Nemo enim ipsam voluptatem</em> quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem <strong>sequi</strong> nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem.<br/><img src="http://placekitten.com/303/200"/><br/>Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure <a href="#">reprehenderit</a> qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?</p>
    <button id="more">Read more &raquo;</button>
    <button id="less">&laquo; Read less</button>
  </div>
</body>
</html>
​
 
body { 
  margin: 50px;
  font: 15px/1.5 sans-serif;
}
img { margin: .8em 0; }
div {
  border: 1px solid black;
  padding: 1em 1.5em;;
}
#less { display: none; }
 
function excerpt(str, nwords) {
  var words = str.split(' ');
  words.splice(nwords, words.length-1);
  return words.join(' ') + 
    (words.length !== str.split(' ').length ? '&hellip;' : '');
}
​
var $p = $('p');
var $more = $('#more');
var $less = $('#less');
​
function less() {
  $p.data('text', $p.html()); // store untouched text first
  $p.html( excerpt($p.html(), 50) );
  $more.show();
  $less.hide();
}
​
function more() {
  $p.html($p.data('text'));
  $more.hide();
  $less.show();
}
​
less(); // init
$('#more').click(more);
$('#less').click(less);
Output 300px

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