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Mouseover
In computing, a mouseover, mouse hover or hover box is a graphical control element that is activated when the user moves or "hovers" the pointer over its trigger area, usually with a mouse, but also possible using a digital pen. The graphical control element 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〔(JavaScript OnMouseOver )〕 and/or Cascading Style Sheets.〔(Advanced CSS Menu | by Web Designer Wall )〕 In case of multiple layers the mouseover event is triggered by the uppermost layer.
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 and might affect only the internal workings of the program.
== Tooltip ==
A special usage of mouseover event is a tooltip showing a short description of the GUI object under the pointer. The tooltip generally appears only after the mouse or stylus is held over the object for a certain amount of time.
On images, these may be produced using the HTML title attribute.〔(【引用サイトリンク】url=http://www.w3.org/TR/html5/dom.html#the-title-attribute )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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