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The CSS nesting module defines a syntax for nesting selectors, providing the ability to nest one style rule inside another, with the selector of the child rule relative to the selector of the parent rule.

CSS nesting is different from CSS preprocessors such as Sass in that it is parsed by the browser rather than being pre-compiled by a CSS preprocessor.

CSS nesting helps with the readability, modularity, and maintainability of CSS stylesheets. It also potentially helps reduce the size of CSS files, thereby decreasing the amount of data downloaded by users.

Reference

Selectors

Guides

Using CSS nesting

Explains how to use CSS nesting.

CSS nesting at-rules

Explains how to nest at-rules.

CSS nesting and specificity

Explains the differences in specificity when nesting CSS.

Specifications

Specification
CSS Nesting Module

See also