><a href="/tutorials/todo/#database">Database</a></li><li><a href="/tutorials/todo/#todos-logic">Todos logic</a></li><li><a href="/tutorials/todo/#testing">Testing</a></li></ul></li><li><label class="more"></label><a href="/tutorials/chat/">Real-time chat</a><ul><li><a href="/tutorials/chat/#user-interface">User Interface</a></li><li><a href="/tutorials/chat/#choose-a-username">Choose a username</a></li><li><a href="/tutorials/chat/#sending-messages">Sending messages</a></li><li><a href="/tutorials/chat/#se