<header>
    <h2>Widget name</h2>
    <input type="submit" class="button button-small action-alert" value="Submit">

</header>
<header>
	<h2>Widget name</h2>
	{{ render '@button-small' }}
</header>
/* No context defined for this component. */

The grey bar at the top of a dashboard widget, containing the header name and sometimes an add button.