Learn how to use native CSS nesting in modern browsers. Understand the & selector, specificity rules, differences from Sass, and when to use nesting with practical examples for components, themes, and accessibility.

Here's where things get a little interesting. CSS nesting follows the same specificity rules as traditional CSS, with one important detail: the & nesting selector calculates its specificity like the :is() pseudo-class it uses the highest specificity from the parent selector list, not the sum of all the selectors.