plugins/markdown/test/data/sanitizing/checkboxes.html

<body>
<ul><li>[] A</li><li class="task-list-item"><input type="checkbox" class="task-list-item-checkbox" checked="checked" disabled="disabled" />B</li></ul>
<input type="checkbox" class="task-list-item-checkbox" checked="checked" disabled="disabled" />
<input type="checkbox" />
<input class="task-list-item-checkbox" />
</body>