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FF and IE give differents offsetTop when a child is into a parent with overflow and border.
FF substracts the top border size of the parent from offsetTop value, so return a negative value(often); I think IE return the correct value instead.
There is a crossbrowser way to get the same value?
Thank you.
The
offsetTopproperty gives the position relative to the offset parent. The difference between Fx and IE is that they use different elements as offset parent in this case.I don’t know exactly how overflow affects this, and I haven’t found anything about that in the definitions yet. However, there is a known bug in IE where it gets the offset parents wrong, and it may be a variation of that bug that you see here.