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Possible Duplicate:
What is the difference between a pseudo-class and a pseudo-element in CSS?
What do the following mean in CSS?
What is the usefulness of each?
Pseudo-classes are used to select elements according to information that you can’t otherwise express using attributes, IDs or classes (or any other info available through the DOM). For example,
:root,:first-child,:last-child,:lang()and:not().Pseudo-elements are mock elements that you can apply styles to selectively as part of other actual elements, but aren’t themselves members of the DOM. For example, content fragments such as
::first-lineand::first-letter, or generated content such as::beforeand::after.“Pseudo-selectors” is an umbrella term used to cover both kinds of selectors (or really any selector that begins with at least one
:), but it is itself meaningless, because in Selectors, pseudo-classes and pseudo-elements are two fundamentally different things.