The document discusses new CSS features for 2022 and how to use them. It covers layout properties like margin-block-start, padding-inline-end, and aspect-ratio. It also discusses selector features like :is(), :has(), and :where(). Mathematical functions like min(), max(), and clamp() are presented. Interaction features like scroll-behavior and position: sticky are covered. Finally, it discusses upcoming features like CSS containers and @layer. Live coding examples are provided to demonstrate several of the new properties.