What is the Pseudo Class in CSS ?

Pseudo classes are those things with colons(:) in them, you know, like :hover or :link. They let you control the CSS of stuff in different forms, states and places easily and efficiently, without taking up too much room. CSS3 is going to introduce a ton of new pseudo classes, and they’re going to make our lives a lot easier (if you take browser compatibility out of the equation). They help both aesthetics and usability, and can make things that were once hard easier than ever before.
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