How to prevent scrolling on axis Y?

[AlexanderKozhevin]

On mobile device you have to use area outside of slider to scroll down.
But of slider we use only axis X.

[JoeGermuska]

I'm not sure I understand your question. My guess was that you had a circumstance where, while someone was interacting with a juxtapose slider, they were accidentally scrolling the page when their drag inside the slider included a Y (vertical) component.

If that's the case, I tried to reproduce it using the demonstration slider on juxtapose.knightlab.com -- when I use this on my iPhone, using either Safari or Chrome browsers, there's no sign of vertical scrolling.

Can you provide an example of a page where the problem is noticeable? A short video/animated gif might also help make sure we're talking about the same thing.