Intro to Compass and SASS
There are many open source frameworks that are released to make theming simpler. One of the problems that themers / front-end developers usually face is the amount of CSS3 features that many want to use, but not all of the different browsers has the capability of getting it working correctly. Therefore, CSS preprocessors like Compass and SASS makes this possible by having predefined mixins, variables, rules and inheritance that are similar to the concepts of Object Oriented Programming.