" class="current"><span></span><a href="/demos/todo-app/todo-app-v3-persistence/">Todo App v3 (persistence)</a></li><li id="TA5"><span></span><a href="/demos/todo-app/todo-app-v4-metrics/">Todo App v4 (metrics)</a></li><li id="TA6"><span></span><a href="/demos/todo-app/todo-app-v5-checkpoints/">Todo App v5 (checkpoints)</a></li><li id="TA7"><span></span><a href="/demos/todo-app/todo-app-v6-collaboration/">Todo App v6 (collaboration)</a></li></ul></li><li id="D3"><span></span><a href="/demos/drawing/">Drawin