javascript - Why would this code not work y = window.scrollY;? -

javascript - Why would this code not work y = window.scrollY;? -

i attempting utilize next code:

y = window.scrolly;

for reason, on particular website, y = 0 regardless of how far scroll vertically. there particular reason this? work on other websites. problem not limited browsers (tested on chrome , firefox).

update: found out reason issue site contained within div position set relative. there way around without disrupting content of site?

i couldn't sure bet using div container scrolls , not "window".

y = document.getelementbyid("container").scrolly;

javascript web scroll