Keyboard & Focus

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1. 1 What makes an interactive element keyboard accessible? Easy
2. 2 What is a focus trap, and when do you need one (e.g. modals)? Medium
3. 3 What's the difference between `tabindex="0"`, `"-1"`, and a positive value? Medium
4. 4 How do you manage focus when opening and closing a dialog or route change? Hard
5. 5 What is a visible focus indicator, and why is removing `outline` a problem? Medium
6. 6 How do you implement a roving tabindex for a composite widget like a menu? Hard