How to implement a popup menu without jQuery?

Question

JavaScript

Can you please tell me how to make a popup menu without jQuery?

Answer 1

I advise you to do it like this:
well, adaptability is done through media queries, if you copy the template, then this is already done for you.
The sliding menu is the easiest way, in my opinion, to remove the class from this div:

.nav.hidden {
 height: 1px;
overflow: hidden;
}
.nav {
 height: auto;
}

By clicking on the button, you remove the hidden class from the block with the menu. For animation use css3 animation.

Answer 2

google "pure css menu" or "pure javascript menu"
ruseller.com/lessons.php?rub=2&id=941 - here, for example.

Answer 3

getbootstrap.com/components/#dropdowns

Answer 4

In my question was about the menu leaving the left?