Form feed after task list item marker
........

- [x]item 1
- [ ]item 2

........

<ul class="contains-task-list">
<li class="task-list-item"><input class="task-list-item-checkbox" type="checkbox" checked="">item 1</li>
<li class="task-list-item"><input class="task-list-item-checkbox" type="checkbox">item 2</li>
</ul>