Musings on Mouse Hover
"I've been thinking a lot lately about mouse hovers. Yeh, I know I really should get out more often ;-)
A mouse hover is a really simple event. When you get a mouseover event you do someting. When you get a mouseout event you usually restore things to the original state.
Mouse hovers were virtually unheard of in the desktop user interface world. I remember writing some very sophisticated applications (games, graphical drawing packages, etc.) and only using mouse hover for some very basic operations. Tooltips & mouse coordinate feedback are two that come to mind.
Ajax, DHTML and the Lowly Hover - Now that interactions are even more dense, the hover has become our friend to discoverability. We are introducing new idioms to the web space. Things like drag and drop and inline editability are not immediately expected. The hover can provide vital clues to the behavior of an application at the moment the user is curious about it. Hovers are also the lightest event for the user (they just move the mouse.)" continued ... (Via Looks Good Works Well)

Flickr Hover.













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