The latest CSS release is CSS View Transitions Level 1, which became a Candidate Recommendation on September 5, 2023. This specification defines a way to create smooth transitions between different views of the same document, such as tabs, slides, or pages. It also introduces a new pseudo-element (::view) that represents the current view of the document, and a new property (view-transition) that controls the transition effect.

Some of the new features in this release are:

• View transitions: You can use the view-transition property to specify how the document should transition from one view to another. For example, you can use view-transition: fade to create a fade-in effect, or view-transition: slide to create a slide-in effect.
• View selectors: You can use the ::view pseudo-element to style the current view of the document. For example, you can use ::view { background: yellow; } to make the current view have a yellow background.
• View media features: You can use media queries to target different views based on their characteristics, such as width, height, orientation, or aspect ratio. For example, you can use @media (view-width: 600px) { … } to apply styles only when the view width is 600 pixels or less.

If you want to learn more about CSS View Transitions Level 1, you can read the specification or check out some examples.