Final Quality Check

Perform one final pass before considering the project complete.

Functionality

Verify:

• Adding tasks
• Editing tasks
• Completing and reopening tasks
• Deleting tasks
• Due dates and priorities
• Filters
• Search
• Sorting
• Drag and drop
• Progress tracking
• Clear actions
• Import and export
• Dark mode
• Persistence
• Custom edit and confirmation modals

UI and responsive behavior

Resize the browser and check the application at desktop and narrow mobile widths. Confirm that controls remain usable and that the prepared layout is not broken by the JavaScript functionality.

Browser console

Open the browser console and make sure there are no errors during normal use.

Checkpoint

You have a complete, polished vanilla JavaScript To-Do List that works as a single application rather than a collection of separate lessons.