3.1. The XUL Document Object3.2. Application Windows3.3. Application Widgets3.4. Tabular and Hierarchical Information3.5. Words and Pictures3.6. Form Controls3.7. Widget Interaction3.8. Content Panels3.9. The Box Model3.10. XUL Attributes3.11. Overlays3.12. The Extras3.13. Building the Application Shell