How to perform an action by scrolling to a certain DIV ?

Question

css

I don’t know how to google correctly, so I ask you, colleagues.
On all sorts of landing pages, you can often see how the animation is performed when a person scrolls to a certain diva, so: how is this implemented? Or leave links to examples.

Answer 1

The use of scrollTop takes place when there are literally a couple of elements on the page that need to be tracked, otherwise there is a lot of script, and moreover, it is repetitive.
I would recommend using the
jQuery Waypoints plugin

Answer 2

e.g. nick-jonas.github.io/windows

Answer 3

api.jquery.com/scrollTop