I read through this a few times to see what it does. It helps find inconsistencies in your webpage design. It does that by reporting the frequency of properties

I read through this a few times to see what it does. It helps find inconsistencies in your webpage design. It does that by reporting the frequency of properties and the frequency of property values in your CSS. You then evaluate that report for potential problems. For instance, shades of blue that are meant to be the same but slightly off. Or font-sizes that are 14px somewhere and 16px somewhere else.