Here’s the Deal
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When comparing cssnano vs CSSO, the Slant community recommends CSSO for most people. In the question“What are the best CSS minifiers?” CSSO is ranked 2nd while cssnano is ranked 5th. The most important reason people chose CSSO is:
CSSO is becoming one of the [fastest](https://twitter.com/cssoptimizer/status/701883790646517760) structural CSS optimizers available.
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Pros
Pro Whitespace & final semicolon removal
Trims whitespace inside and around rules, selectors & declarations, plus removes the final semicolon inside every selector.
Pro Comment removal
postcss-discard-comments removes comments in and around rules, selectors & declarations. Note that any special comments marked with ! are kept by default.
Pro Calc Function
Pro Duplicate rules removed
Pro Focused optimisations
Pro Autoprefixer
Add needed prefixes and remove unnecessary based on its browsers option and can I use data
Cons
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No cons yet!