07-Design-Patterns Observer 7.9.2 Example #2: The Keypress Game
08-DOM-and-Browser-Patterns 8.3.1 Event Handling
08-DOM-and-Browser-Patterns 8.3.1 Event Handling revised
08-DOM-and-Browser-Patterns 8.3.2 Event Delegation
08-DOM-and-Browser-Patterns 8.3.2 Event Delegation revised