Cross-browser method for detecting the scrollTop of the browser window

Question

What is the best cross-browser way to detect the scrollTop of the browser window? I prefer not to use any pre-built code libraries because this is a very simple script, and

Answer 1

I believe the best way to get scrollTop in modern browsers is to use

const scrollTop = document.scrollingElement.scrollTop

if this doesn't work you could also try

const scrollTop = Math.max(document.documentElement.scrollTop, document.body.scrollTop, document.scrollingElement.scrollTop)