<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<h4> Mr. M.'s Understanding TB's Responsive Utilities</h4>
<p>
Example of using Twitter Bootstrap 3's "responsive utilities"
</p>
<!-- see JS file for writing out size of window in class testp -->
<p class="testp btn btn-success pull-right"></p>
<p>
<a href="http://bootsnipp.com/iframe/BER9z" target="_blank">View Full Screen</a>
</p>
<img src="https://www.rocketnexusdesign.com/bootsnip_images/LathedObjectImage" alt="" class="img-responsive img-rounded center-block">
<img src="https://www.rocketnexusdesign.com/bootsnip_images/Material_in_3ds_max" alt="" class="img-responsive img-rounded center-block">
<img src="https://www.rocketnexusdesign.com/bootsnip_images/Vector_man_test" alt="" class="img-responsive img-rounded center-block">
<img src="https://www.rocketnexusdesign.com/bootsnip_images/extrude_bent_text" alt="" class="img-responsive img-rounded center-block">
<br><br>
<blockquote>
For faster mobile-friendly development, use these utility classes for showing and hiding content by device via media query.
</blockquote>
<p class="lead">
Resize your browser to see <strong>four</strong> separate images displayed, depending on width of screen.
</p>
<p>
<br>
See Twitter Bootstrap docs at: <a href="http://getbootstrap.com/css/#responsive-utilities" target="_blank">http://getbootstrap.com/css/#responsive-utilities</a>
</p>
<p>
<small>Image: <a href="http://www.flickr.com/photos/arselectronica/8613554284/sizes/k/" target="_blank">Ars Electronica</a><br>
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fbootsnipp.com%2Fiframe%2FBER9z" target="_blank">HTML 5 Valid</a></small>
</p>