Standard web buttons are one element whose default appearance can vary wildly between browsers and platforms, and they are also very difficult to style consistently across browsers. Styled buttons also look far less "buttony" to the average web user than unstyled buttons, and they can often just feel not very much like buttons. Styled buttons also often lack the inverted bevel effect that makes them look like they are being depressed when they are clicked.
The YUI Button family overcomes these difficulties with ease, providing rich and attractive buttons, whose styling is consistent across A-grade browsers and whose functionality far exceeds that of traditional buttons. Another important property of the Button Control as opposed to standard HTML buttons is that the Button Control can have a label that is entirely different from its value.