What does role="presentation" do?
I don't see that it makes a change with or without.
Example:
<div class="dropdown">
<a class="dropdown-toggle btn btn-default" data-toggle="dropdown" href="#" >Dropdown trigger <span class="caret"></span></a>
<ul class="dropdown-menu" role="menu" aria-labelledby="dLabel">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Action</a></li>
<li><a role="menuitem" tabindex="-1" href="#">Another action</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Something else here</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">Separated link</a></li>
</ul>
</div>
