xmpp.chapril.org-conversejs/src/templates/rooms_list.html

<a href="#" class="list-toggle open-rooms-toggle controlbox-padded" title="{{{o.desc_rooms}}}">
    <span class="fa {[ if (o.toggle_state === o._converse.OPENED) { ]} fa-caret-down {[ } else { ]} fa-caret-right {[ } ]}">
    </span> {{{o.label_rooms}}}</a>
<div class="items-list rooms-list open-rooms-list"></div>