CSS4 isn't a single, monolithic specification like CSS3 was. Instead, it represents a collection of modules being developed independently. These modules introduce new features and improvements to CSS, focusing on areas like selectors, custom properties, layout (e.g., grid, flexbox), and typography. The term "CSS4" is often used informally to refer to these newer CSS features developed after CSS3. It's commonly used by web developers to style and layout web pages and applications.
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