Why is document.body.scrollTop always 0 in IE, even when scrolling?

document.body.scrollTop in IE is always 0, even when scrolling

When you move the mouse, in the status bar Display the value of document.body.scrollTop. In IE, this value is always 0. Why is it always 0? Is there any other way to get how much the scrollbar has moved?

To resolve this issue, for older document types in IE, you can try the following:

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

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