Dropdown Button in Group with 2.1.0

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.0/css/bootstrap.min.css">
<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.1.0/js/bootstrap.min.js"></script>
<h2>Dropdown buttons in group with 2.1.0 <small>Using google webfonts 'open sans'</small></h2>

<div class="btn-group">
<button class="btn">One</button>
<button class="btn btn-group">
    <a class="btn dropdown-toggle" data-toggle="dropdown" href="#">
    Two
    <span class="caret"></span>
  </a>
  <ul class="dropdown-menu">
      <li><a href="#">foo</a></li>
  </ul></button>
<button class="btn">Three</button>
</div>

CSS

/* https://developers.google.com/webfonts/docs/webfont_loader#Example */
/* Added visibility hidden */
h2 {
    font-family: 'open sans';
    visibility: hidden;
  }
  /* Added wf-active */
  .wf-active h2 {
    visibility: visible;
  }

.btn-group.btn {
    border: 0;
    padding: 0;
}

.btn-group.btn > .btn {
    border-radius: 0
}

.btn-group.btn > .dropdown-menu {
    text-align: left;
}
/* Added visibility hidden */
.btn-group > .btn, .btn-group > .dropdown-menu {
    font-size: 14px;
    font-family: 'open sans';
    visibility: hidden;
}
/* Added wf-active */
.wf-active .btn-group > .btn, .wf-active .btn-group > .dropdown-menu {
    visibility: visible;
  }

JavaScript

WebFontConfig = {
    google: { families: [ 'Open+Sans::latin' ] }
  };
  (function() {
    var wf = document.createElement('script');
    wf.src = ('https:' == document.location.protocol ? 'https' : 'http') +
      '://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js';
    wf.type = 'text/javascript';
    wf.async = 'true';
    var s = document.getElementsByTagName('script')[0];
    s.parentNode.insertBefore(wf, s);
  })();