How do I learn to code in HTML and CSS on my Mac? Web design is one of the most useful skills you can learn, and it’s easy to learn HTML and CSS (the two main pillars of web pages) in Mac OS X.

HTML provides the structure, content and layout, CSS adds style and design, and JavaScript adds functionality and interactivity.

Using Sass to Help Internet Explorer Handle 'Mobile-First' Designs If you’ve embraced a mobile-first approach to responsive design, you’re probably building your CSS in layers.