What are Internet Easter eggs?

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Tags

1. #jokes
2. #hidden
3. #websites
4. #features
5. #programmers
6. #messages
7. #software
8. #easter
9. #build
10. #google
11. #developers
12. #treats
13. #holiday
14. #barrel
15. #happens
16. #internet
17. #designers
18. #askew
19. #aside