CSSTidy is an open source CSS parser and optimiser. You can use it as executeable file which can be controlled via the command line or through a PHP script. The parser is available for Windows, Linux and OSX.
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A great Firefox plugin based on Tidy is also available https://addons.mozilla.org/extensions/moreinfo.php?id=249&application=firefox
A great Firefox plugin based on Tidy is also available https://addons.mozilla.org/extensions/moreinfo.php?id=249&application=firefox