The days when frontend and backend were completely different disciplines are long gone. Surely we all try to build sites with a clean separation of data, html output and styling. But that does not mean that theming is just writing templates and css. Front end developers can use a number of tools to write, maintain and re-use their code: the backend of frontend, so to speak. Even Sass is turing complete!
In this session I will discuss a selection of these tools: