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
close Generic close icon for dismissing content like modals and alerts.
disabled Disabled state.\n\nFor <a>  Opera <18, IE11 use JS to disable such link.\n
dropdown-toggle
left See .carousel-control\n <a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">\n
navbar-brand Replace the navbar brand with your own image by swapping the text for an <img>.\nSince the .navbar-brand has its own padding and height, you may need to override some CSS depending on your image.\n<div class="navbar-header">\n <a class="navbar-brand"..\n
navbar-btn Add the .navbar-btn class to <button> elements not residing in a <form> to vertically center them in the navbar
navbar-left These classes are mixin-ed version of .pull-left
navbar-right These classes are mixin-ed version of .pull-right
right See .carousel-control\n <a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">\n