- Removes useless white spaces, indentation characters and line breaks;
- Removes empty rules and nested blocks;
- Removes quotes when unnecessary;
- Removes negative paddings;
- Strips all comments;
- Removes redundant zeros ;
- Replaces time units with shorter values;
- Hexadecimal colors following the pattern #9900FF are reduced to #90F;
- Removes units when using zero values;
- Removes the last semi-colon of a style declaration and extra semi-colons.