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The first rule style means one has to search up the markup and look at a lot of CSS rules to find what is relevant.
It gets even harder if one is injecting HTML via Javascript - very hard to find the CSS linkages with the previous form.
Another way of saying this is that LOGbutton is a lot easier to find.
Incidentally this particular example was a result of SASS expanding out nested rules which it supports. Another good reason not to use CSS preprocessors.