How to Get the Correct Y Position of an Element in CHATGPT UI

In ChatGPT's web UI, window.scrollY always returns 0 because scrolling occurs inside a nested container rather than the document itself. The article explains how to find the actual scroll container by walking up the DOM, then calculate the correct Y position using getBoundingClientRect().top combined with the container's scrollTop. It also provides verification methods and notes this pattern applies to browser extensions, UI automation, and any SPA with internal scroll containers.