Why Does `document.body.scrollTop` Always Return 0 in IE?

Troubleshooting Document.body.scrollTop Always Returning 0 in IE

Problem:
Retrieving the scroll position using document.body.scrollTop in Internet Explorer consistently returns 0, even when the page is scrolled.

Reason:
IE handles page scrolling differently from other browsers. Particularly in older versions, document.body.scrollTop may not reliably track scroll movements.

Solution:

For older versions of IE, a comprehensive approach is recommended:

var top = (document.documentElement && document.documentElement.scrollTop) || 
              document.body.scrollTop;

This code checks both document.documentElement.scrollTop and document.body.scrollTop to obtain the correct scroll position in most versions of IE.

If you are using a newer version of IE or a more refined approach is required, consider utilizing the window.scrollY property instead:

var top = window.scrollY;

window.scrollY provides a cross-browser solution for retrieving the vertical scroll position.

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