The .dropdown class indicates a dropdown menu. To open the dropdown menu, use a button or a link with a class of .dropdown-toggle and the data-toggle="dropdown" attribute. The .caret class creates a caret arrow icon (), which indicates that the button is a dropdown. Add the .dropdown-menu class to a <ul> element to actually build the dropdown menu.

The .divider class is used to separate links inside the dropdown menu with a thin horizontal border:

The .dropdown-header class is used to add headers inside the dropdown menu:

To disable an item in the dropdown menu, use the .disabled class (gets a light-grey text color and a "no-parking-sign" icon on hover):

To right-align the dropdown, add the .dropdown-menu-right class to the element with .dropdown-menu:

If you want the dropdown menu to expand upwards instead of downwards, change the <div> element with class="dropdown" to "dropup":

To help improve accessibility for people using screen readers, you should include the following role and aria-* attributes, when creating a dropdown menu:

If you want the dropdown menu to expand upwards instead of downwards, change the <div> element with class="dropdown" to "dropup":