A "work in progress" (ie. not yet ready for prime-time) minifier/preprocessor for CSS:
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parses CSS from multiple files, including a limited form of inheritence to enable base stylesheets to be used intelligently
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can emit warnings when encountering invalid CSS
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accepts "colour" and "background-colour" properties for people that habitually spell correctly
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optimises output CSS files by omitting unnecessary source elements such as comments, non-significant whitespace and redundant rules
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useful preprocessing features, such as
- different block-level and line-level comment styles
- reusable definitions
- automatic expansion of commonly replicated CSS rules (eg. border-radius, -moz-border-radius, -webkit-border-radius)