At the October meeting, we followed up on CSS variables with a demonstration of SASS, the CSS preprocessor. CSS variables are only supported in recent versions of Firefox, but preprocessors support variables and other advanced options and write valid CSS that any browser can read.
As an overview, we looked at a video on preprocessors called CSS Preprocessors, LESS, SASS and Stylus. Another good overview is CSS Basics (Part8) — CSS Preprocessors.
SASS is available at the SASS website. Sass runs on Ruby, which is available at RubyInstaller for Windows.
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