🏠 New in High Baseline Support: Nesting

June 11, 2026

caniuse · mdn · spec

CSS nesting allows for shorter selectors, easier reading, and more modularity by nesting rules inside others.

Source features

• api.CSSStyleRule.cssRules [mdn]
• api.CSSStyleRule.deleteRule [mdn]
• api.CSSStyleRule.insertRule [mdn]
• css.selectors.nesting [mdn]
• api.CSSNestedDeclarations [mdn]
• api.CSSNestedDeclarations.style [mdn]