The Vanishing Button System

Once you've learned a topic (including this one), say good‑bye to the button. Your progress is saved automatically in the score keeper below.

How it works:

• Click any button to learn about that feature
• Press & hold for 3 seconds to dismiss topics you've mastered
• Watch the white progress bar fill at the bottom of the button
• When it's full, the button vanishes – you've mastered it!
• Your progress is tracked in the score keeper below

Try it now! Hold this button for 3 seconds to make it disappear.