How can I determine if a div is scrolled to the bottom?

Question

How do I determine, without using jQuery or any other JavaScript library, if a div with a vertical scrollbar is scrolled all the way to the bottom?

My question is no

Answer 1

In order to get the correct results when taking into account things such as the possibility of a border, horizontal scrollbar, and/or floating pixel count, you should use...

el.scrollHeight - el.scrollTop - el.clientHeight < 1

NOTE: You MUST use clientHeight instead of offsetHeight if you want to get the correct results. offsetHeight will give you correct results only when el doesn't have a border or horizontal scrollbar