Mouseover
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A Mouseover or hover box refers to a GUI event that is raised when the user moves or "hovers" the cursor over a particular area of the GUI. The technique is particularly common in web browsers where the URL of a hyperlink can be viewed in the status bar. Site designers can easily define their own mouseover events using Javascript[1] and Cascading style sheets[2].
Mouseover events are not limited to web design and are commonly used in modern GUI programming. Their existence might not even be known to the user as the events can be used to call any function that might affect only the internal workings of the program.
[edit] Tooltip
A special type of mouseover event is a tooltip used to show a short description of the GUI object under the cursor. The tooltip generally appears only after the mouse is held over the object for a certain amount of time.