style.display=""?

Question

When I first click it show me that element have empty display value, why?

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

Answer 1

https://code.sololearn.com/Wicod4qBtW35/?ref=app

Here

Answer 2

Andri Hry Thank You!
edit: I found that this not working in desktop mode