HTML

dropdown uikit

<div class="uk-inline">
    <button type="button"></button>
    <div uk-dropdown="mode: click"></div>
</div>

dropdown uikit

<button type="button"></button>
<div uk-dropdown></div>

dropdown uikit

<button type="button"></button>
<div uk-dropdown>
    <ul class="uk-nav uk-dropdown-nav">...</ul>
</div>