active Pressed button
btn Highly recommend using the <button> element whenever possible to ensure matching cross-browser rendering.
btn-block Create block level buttons—those that span the full width of a parent
btn-danger
btn-default
btn-info
btn-lg Button sizing
btn-link Deemphasize a button by making it look like a link while maintaining button behavior
btn-primary
btn-sm Button sizing
btn-success
btn-warning
btn-xs Button sizing
carousel-control <a class="left carousel-control" href="#example" role="button" data-slide="prev">\n  <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>\n  <span class="sr-only">Previous</span>\n</a>\n
disabled Disabled state.\n\nFor <a>  Opera <18, IE11 use JS to disable such link.\n
dropdown-toggle
form-control Set to width: 100%; by default. Wrap labels and controls in .form-group for optimum spacing.
input-lg modifier classes to decrease or increase the height and font-size of form controls
input-sm modifier classes to decrease or increase the height and font-size of form controls
left See .carousel-control\n <a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">\n
navbar-btn Add the .navbar-btn class to <button> elements not residing in a <form> to vertically center them in the navbar
right See .carousel-control\n <a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">\n