How to disable page dragging in iOS using pure javascript, but to make scrolling work in blocks?

Question

JavaScript

How to disable overscroll in pure javascript (when the page is dragged up / down more than itself)
Here is an example

spoiler

Found a question on stackoverflow, but all the pure JS solutions didn't work for me.
It is necessary that blocks that have a scroll can be scrolled.

Answer 1

event.preventDefault()

Answer 2

Sometimes I read some questions and think: Why?