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This will extract the differing CSS entries of two files. I've left the initial character (plus or space) in output to show the real differing line, remove the initial character to get a working CSS file. The output CSS file is usable by either adding it in a below the to original.css, or by only using the output but adding @import url("original.css"); in the beginning.
This is very useful for converting Wordpress theme copies into real Wordpress child themes.
Could exclude common lines within entries too, I guess, but that might not be worth the complexity.
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