The CSS nesting module allows you to write your stylesheets so that they are easier to read, more modular, and more maintainable. As you are not constantly repeating selectors, the file size can also be reduced.

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CSS nesting allows writing stylesheets that are easier to read, modular, and maintainable by reducing repetitive selectors. Unlike CSS preprocessors like Sass, CSS nesting is parsed directly by browsers. The `&` nesting selector is used to join selectors, improve readability, and ensure compatibility. Examples demonstrate how to use nesting with child selectors, combinators, and compound selectors, as well as highlighting invalid nested rules.

Using CSS nesting - CSS: Cascading Style Sheets