Cascading Style Sheets, or CSS, is just what it stands for. HTML was once for styling, but it became very tedious. Thus, CSS was born. Now, CSS is the skin of the website and the language for styling web pages with fancy and simple designs.
What's behind all of the Wikia development? Like the slideshows, galleries, special pages, photos, etc? MediaWiki. MediaWiki is a free software open source package written in PHP originally used for Wikipedia. Now it's used for Wikia and other projects.
Ruby has been gaining popularity, and a framework called Ruby on Rails has helped to increase its usage for web programming. The Ruby language is completely object-oriented, in that everything is an object. For instance, even the most basic data types like integers have methods and instance variables. This provides a greater ability to use method chaining, where many lines of code can be consolidated into one.