Should I use PX or REM?

Related questions

1. What does em and REM stand for?
2. What is EM code?
3. What is the purpose of PX measurement unit?
4. What is EM in padding?
5. What does CSS em stand for?
6. What is em to px?
7. What does em mean prefix?
8. What is EM full form in CSS?
9. What is EM in coding?
10. What is the difference between EM and REM?

Tags

1. #depending
2. #pixel
3. #could
4. #settings
5. #which
6. #value
7. #design
8. #anything
9. #scalable
10. #translated
11. #units
12. #160px
13. #browser
14. #values
15. #translate
16. #flexible
17. #other