Collapse collapse.js(Flexible plugin that utilizes a handful of classes for easy toggle behavior.)

<a class="btn btn-primary" data-toggle="collapse" href="#collapseExample" aria-expanded="false" aria-controls="collapseExample"> Link with href </a> <button class="btn btn-primary" type="button" data-toggle="collapse" data-target="#collapseExample" aria-expanded="false" aria-controls="collapseExample"> Button with data-target </button> <div class="collapse" id="collapseExample"> <div class="well"> Collapse collapse.js<br>Flexible plugin that utilizes a handful of classes for easy toggle behavior. </div> </div>