"Understanding Responsive Utilities"
Bootstrap 3.1.0 Snippet by blunin

<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 ----------> <div class="container"> <div class="row"> <!-- see JS file for writing out size of window in class testp --> <div class="visible-lg"> <img src="http://i.imgur.com/RqrdXAj.jpg" alt="" class="img-responsive img-rounded center-block"> <!-- <p class="text-center btn-danger"> Large devices Desktops (≥1200px) </p> --> </div> <div class="visible-md"> <img src="http://i.imgur.com/Xsdbf9u.jpg" alt="" class="img-responsive img-rounded center-block"> <!-- <p class="text-center btn-warning"> Medium devices Desktops (≥992px) </p> --> </div> <div class="visible-sm"> <img src="http://i.imgur.com/uEh5Wq3.jpg" alt="" class="img-responsive img-rounded center-block"> <!-- <p class="text-center btn-info"> Small devices Tablets ( (≥768px)) </p> --> </div> <div class="visible-xs"> <img src="http://i.imgur.com/ds01Rcv.jpg" alt="" class="img-responsive img-rounded center-block"> </div> </div> <!-- /.row --> </div> <!-- /.container -->
body{ background-color:black; color:#ccc; } img{ padding:30px }
/* * How to detect browser width * Ref: http://www.surfingsuccess.com/jquery/window-width.html#.Uw1RiV6Lfx4 */ $(window).ready(function() { var wi = $(window).width(); $("p.testp").text('Initial screen width is: ' + wi + 'px.'); $(window).resize(function() { var wi = $(window).width(); $("p.testp").text('Width is currently: ' + wi + 'px.'); }); });

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