How to make smooth scrolling in browser?

Question

JavaScript

I saw a couple of Western bloggers scrolling in the browser very smoothly, and when it reaches the end / top of the page, it scrolls another 10 pixels, and this sets a certain smoothness.
What plugin is being used?
I can’t throw off bloggers’ links, as it will be advertising.

Answer 1

Keep the link , and here is the demo , in particular for chrome, here is the link