css - Formatting and load times -

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i have been reading bit on compressed , uncompressed css files, haven't seen talk specific formatting in css file.

should group things this: 

.class1, .class2, .class3, .... {     color: [color];     background: [image/color];     .... }

or better keep them seperated, this:

.class1 {     color: [same color];     .... } .class2 {     color: [same color];     ....  }

does affect load time in way? personal preference?


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