What program does YouTube use to play videos?

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Tags

1. #death
2. #platform
3. #html5
4. #standard
5. #which
6. #flash
7. #internet
8. #videos
9. #explorer
10. #hastened
11. #dumped
12. #player
13. #video
14. #default
15. #favor
16. #safari
17. #firefox
18. #versions
19. #adobe
20. #youtube
21. #chrome