Why isn't the copy function working?

Question

https://code.sololearn.com/WZZXO21ZNlbp/?ref=app

Answer 1

Function select() only works on input tag.
Create an temp input and put it outside of viewport.
Copy style text into that input and exec copy.

https://code.sololearn.com/WiCveHSYxuzq/?ref=app

Answer 2

thank you

Answer 3

how can I do that then?