What is CSS extension?

Related questions

1. What is an example of transition?
2. What is transition and its types?
3. What is CSS Webkit?
4. What are transition statements?
5. What can I say instead of so?
6. What is transition in css3 explain with syntax?
7. Does Opera use WebKit?
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Tags

1. #indentation
2. #spacing
3. #properties
4. #format
5. #customized
6. #files
7. #style
8. #contents
9. #contains
10. #display
11. #elements
12. #cascading
13. #global
14. #color
15. #define
16. #webpage
17. #sheet
18. #borders
19. #location