10.4.1. Packaging Your Functionality into Units10.4.2. Maintenance and Testing10.4.3. Memory Leaks, Local Storage, and Robustness10.4.4. Reducing Every Effect to Its Simplest10.4.5. Critical Areas of a Site10.4.6. Don't Over-Mash10.4.7. A Multitude of Devices10.4.8. Limit "Cool"10.4.9. But Cool's Good, Too