anchor.diff:    li
       ..classes.add('singletask')
       ..onClick.listen((e) {
  -    li.classes.toggle('hidesingletask');
  -    li.parent.children[1].classes.toggle('hideedittask');
  -  })
  +      li.classes.toggle('hidesingletask');
  +      li.parent.children[1].classes.toggle('hideedittask');
  +    })
       ..append(p);
     return li;
   }
  
positive.code:     ..append(ti);
    button
      ..onClick.listen((e) {
            st.deleteItemInStorage(task);
            li.parent.remove();
          })
      ..text = "Delete";
    li
      ..classes.add('singletask')
  
negative.code:   ButtonElement button = new ButtonElement();
    ti
      ..value = task.summary
      ..classes.add('summarytext')
      ..addEventListener('blur', (e) {
        li.classes.toggle('hideedittask');
        li.parent.children[0].classes.toggle('hidesingletask');
      });
    fe
      ..onSubmit.listen((e) {
        e.preventDefault();
        task.summary = ti.value;
        st.editItemInStorage(task);
        li.parent.children[0].classes.toggle('hidesingletask');
        li.classes.toggle('hideedittask');
  