#1 - That is what your VCS history is for. #2 - Choose good variable names and you don't need these comments. #3 - Use built-time templating to do variable subs

#1 - That is what your VCS history is for. #2 - Choose good variable names and you don't need these comments. #3 - Use built-time templating to do variable substitution in your CSS as part of your build process. #4 - Nonsense. #5 - Nonsense / That is what your VCS is for.