Check if the user is scrolled to the bottom of the page.

scroll-offset.js

window.onscroll = function() {
  var d = document.documentElement;
  var offset = d.scrollTop + window.innerHeight;
  var height = d.offsetHeight;

  console.log('offset = ' + offset);
  console.log('height = ' + height);

  if (offset >= height) {
    console.log('At the bottom');
  }
};

@whitehorse0 jquery, meh

Not working on Safari

FYI scrollTop on chrome android 80 returns float

Not working on Safari

The following code work for me in safari.

$(window).on("scroll", function() { if ((window.innerHeight + window.scrollY) >= document.body.offsetHeight) { }}

Niceee 👏

But there's a problem with these solutions.
When the page is Zoomed.

The numbers of the height stays float