Comment by Anm

Given so many webpages have dynamic elements, piece of HTML/DOM that only pop up in edge cases (alerts like cookie notices, loading animations, confirmation dialogs) I would be very wary that a tool would be able to identify all the things that are really in use. To use effectively, I think you would need a test script that stepped through all the edge cases, and then you're depending on your test coverage being 100% (of at least triggering the possible DOM structures and style class configurations).