Check off one item as complete and grey it out

[tamarabuilds]

User experience
User will see a list of open tasks. They mark one task complete by clicking the checkbox. The task font will turn grey, possibly with strikethrough. The checkbox will remain checked.

Technical components
The selected task will move from the "not completed" (or "open") to the "completed" array in local storage. CSS will manage the visual queues that the task is completed.