CSS isn't necessary for good-looking sites; HTML provides structure, and browsers use appropriate default styles. Design web pages by focusing on semantics through proper HTML tags.

And we’ve also got a roundup of the best web design software for Mac. How to learn HTML and CSS and web design on your Mac: what you’ll need You don’t need much to create web pages in OS X.

Ryan Boudreaux includes all the code snippets you'll need in this demo of how to create an image hover-preview effect using HTML, CSS, and JavaScript.