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Reference
Glossary
RolloverRollover is a widely used dHTML effect, its name originally
coming from Macromedia Director's scripting language, Lingo. Internet
Explorer 4.0 first supported rollover effects through Cascading Stylesheets (CSS) without
requiring extra code. The dHTML mouseover works by switching the visibility
of a CSS layer from hidden to visible and back again. This kind of rollover
allows you to swap in text or plug-ins, as well as alternate back
and forth between images to create the effect. The 4.0 implementation of
CSS and JavaScript is not consistent,
however, so the code can get ugly.
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