{{! `heading` is optional. }}
<div class="mw-sidebar-action">
	<div class="mw-sidebar-action-item">
		{{#heading}}<h3 class="mw-sidebar-action-heading">{{.}}</h3>{{/heading}}
		<div class="mw-sidebar-action-content">
		{{{html-content}}}
		</div>
	</div>
</div>