Why would you ever need to optimize (or optimise, which ever spelling you prefer) or reFormat your CSS? Optimizing your CSS will not only allow your web page to load quicker, it also increases the durabilty and resilience of your site when there is a spike in visitors (i.e. the Digg effect) and, for me, the most important part is that it gives you more readable code.
Some of these tools are fairly basic, offering optimization and formatting without many options or user control, which are fine for coders with limited knowledge. For the CSS pros, there are some advanced tools and apps that will allow you to choose the level of compression and also offer many options regarding your optimized CSS. You can choose to eliminate unused selectors and properties, unwanted whitespace, tabs, comments and you can even change the longhand declaration to shorthand notations.
No one who codes there CSS has complete confidence that it is perfectly formatted, this is were these tools come in and help.
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