demo/src/app/components/+dropdown/demos/keyboard/keyboard.html
<div dropdown class="btn-group" keyboardNav="true">
<button id="button-keyboard" dropdownToggle type="button" class="btn btn-primary dropdown-toggle"
aria-controls="dropdown-keyboard">
Dropdown with keyboard navigation <span class="caret"></span>
</button>
<ul id="dropdown-keyboard" *dropdownMenu class="dropdown-menu"
role="menu" aria-labelledby="button-keyboard">
<li role="menuitem"><a class="dropdown-item" href="#">Action</a></li>
<li role="menuitem"><a class="dropdown-item" href="#">Another action</a>
</li>
<li role="menuitem"><a class="dropdown-item" href="#">Something else
here</a></li>
<li class="divider dropdown-divider"></li>
<li role="menuitem"><a class="dropdown-item" href="#">Separated link</a>
</li>
</ul>
</div>