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.

But there’s another financial aid form you may also need to fill out: the College Scholarship Service Profile, or CSS Profile.

jsFiddle lets developers play with the three core elements of Web development. Check out this powerful application for rapid prototyping and testing.

The HTML form passes key-value pairs to PayPal in a "variable=value" format; you are required to pass a specific action URL and some input fields.

Pure CSS offers a minimalist, mobile-first approach to CSS layouts in your web pages. Let's get started with this lightweight framework, which you can use as-is or extend with a variety of plugins.