How is the opacity effect different from the alpha effect?

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Tags

1. #setting
2. #level
3. #transparent
4. #property
5. #object
6. #makes
7. #elements
8. #alpha
9. #extension
10. #whole
11. #element
12. #channel
13. #content
14. #which
15. #specifies
16. #color
17. #opacity
18. #values
19. #including