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Hexadecimal short is applied only where there is no loss in information (color value).
For example, #334455 will be converted to #345, and no loss of information will occur. However, #123456 can not be converted to hexadecimal short format without any loss of color information.
I now understand that it has to be duplicate pairs. But it seems to miss out rgb values in shorthand properties.
eg; #custom2 {background: rgb(99, 145, 169) url(images/authorbg.jpg) repeat-x repeat-y center; border-bottom: 1px solid rgb(0, 0, 0);}
Yes you are right, there is a problem. I am afraid we have not planned to change this in nearest future. Because this is the first problem report we have received about it so far in 2 years.
Colors are handled in CSS color properties only. It does not work on CSS color values inside shorthand properties.
It was technically challenging to support also colors in shorthand properties, so we did not implement it.