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CSS

Why is the selector for the contact details overqualified?

In this lesson nick selects the contact detail list items with

.contact-info li.mail

Why is that? Isn't the idea of a class to make a element identifiable and directly selectable? My code editor is telling me it is overqualified as well.

EDIT: Sorry, I accidentally postet this in the general CSS forum. Couldn't find out how to move the thread. The question is related to the following lesson: https://teamtreehouse.com/library/how-to-make-a-website/adding-pages-to-a-website/add-iconography