CSS has historically been one of the areas of big difference between browsers. jQuery provides a set of cross=browser functions for working with CSS values that commonly appear in different situations.
height(): get or set the width or height property of an element
innerHeight(): get or set the inner width/height
outerHeight: get or set the outer width/height
offset(): get the coordinates of an element relative to the document
position(): get the coordinates of an element relative to the offset parent