What is cucumber in selenium?

Related questions

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6. What are tags in cucumber?
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Tags

1. #along
2. #application
3. #acceptance
4. #watir
5. #cucumber
6. #which
7. #tests
8. #driven
9. #based
10. #capybara
11. #write
12. #selenium
13. #behavior
14. #introduction
15. #development
16. #framework