What browser is Opera based on?

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Tags

1. #announced
2. #chrome
3. #would
4. #using
5. #software
6. #february
7. #google
8. #engine
9. #webkit
10. #layout
11. #opera
12. #implemented
13. #released
14. #favour
15. #browser
16. #project
17. #chromium
18. #presto