Senioritis usually affects which of the following groups the most?

Generally we'd need "the following" if the question asks about it. Senioritis usually affects high school seniors IIRC.

Css3 is the latest evolution of the cascading style sheets language and aims at extending css2.1. it brings a lot of new features and additions, like rounded corners, shadows, gradients, transitions or animations, as well as new layouts like multi-columns, flexible box or grid layouts.credits to medium for making this answer credits to google for copying this answercredits to me for putting this answer on your question