How to know end of scroll when scrolling?

Question

JavaScript

How, depending on the height / resize, to find out that a person has scrolled to the end?
I have a small example: https://codepen.io/Genri_Rus/pen/VwvMZMx

The panel is pressed to the bottom and, accordingly, the height of the body is different, but how exactly do you know the end of the scroll?

Answer 1

window.addEventListener('scroll', event => {
  if (scrollY + innerHeight === document.body.scrollHeight) {
    // Code here
  }
});