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People who know me also know I’ve interest in the GUI: that means I’ve sometimes to get my hands dirty and dig deep into stylesheets (even though I’ve no graphical skill whatsoever). When it happens, I’ve always questions regarding how to best factorize styles. In this regard, the different CSS versions are lacking, because they were not meant to be managed by engineers. A recent trend is to generate CSS from a source, which brings some interesting properties such as nesting, variables, mixins, inheritance and others. Two examples of this trend are LESS and SASS. A not-so-quick example can be found just below. Given that I’m an engineer, the only requirement I have regarding those technologies is that I can generate the final CSS during my build in an automated and reproductible way. After a quick search, I became convinced to use wro4j. Here are the reasons why, in a simple use-case.