Toggle button using toggle() function

Question

I'm trying to make a toggle button with toggle function () but after I tried it why ul I omitted with display: none; does not appear when I have added activeul class by using function toggle () but why not succeed please help thank you.

https://code.sololearn.com/WZLZ905kEzG7/?ref=app

Answer 1

ul.style.display = "block";

Answer 2

.activeul{
display:block !important;
}

Answer 3

Calviղ is there any other way besides that?