Nicholas Zakas and Nicole Sullivan released a really great tool called CSS Lint which according to its authors:

CSS Lint is a tool to help point out problems with your CSS code. It does basic syntax checking as well as applying a set of rules to the code that look for problematic patterns or signs of inefficiency. The rules are all pluggable, so you can easily write your own or omit ones you don’t want.

The project is open source and available at github.

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