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The pseudo-classes are used to target elements without having to add extra classes, attributes or ID; that is why it is called in that way, pseudo-class. Throughout our previous posts, we have covered a few new CSS3 pseudo-classes, including :not, :before and :after, :first-of-type and we also use pseudo-classes in ...

"CSS3 is a wonderful thing, but it's easy to be bamboozled by the transforms and animations (many of which are vendor-specific) and forget about the nuts-and-bolts selectors that have also been added to the specification. A number of powerful new pseudo-selectors (16 are listed in the latest W3C spec) enable us to select elements based on a range of new criteria."

Today's front-end developers don't just need to understand how to write CSS, we need to know how to write it efficiently. And what "efficiently" means can depend on your project and environment. Perhaps you have a team with several members working in the CSS and you need an efficient way to work together. Or maybe you have a huge enterprise site and you need your CSS optimized for speed. You could even be working with a legacy system that restricts access to HTML, which means you need efficient selectors to effectively style elements without ids or classes. You might even face all these situations and more.

Up to this point, the most common use for CSS3 Transitions has been in conjunction with the well-known CSS :hover pseudo-class.

"An extensive CSS reference with all the important properties and info to learn CSS from the basics."

"An extensive CSS reference with all the important properties and info to learn CSS from the basics."