CSS conditional rules

The CSS conditional rules module lets you define a set of rules that will only apply based on the capabilities of the processor or the document the style sheet is being applied to.

Reference

At-rules

Specifications

Specification
CSS Cascading and Inheritance Level 5
# at-import
Media Queries Level 4
# media-descriptor-table
CSS Conditional Rules Module Level 3
# at-media
CSS Conditional Rules Module Level 4
# at-supports-ext
CSS Conditional Rules Module Level 3
# at-supports

Browser compatibility

css.at-rules.import

BCD tables only load in the browser

css.at-rules.media

BCD tables only load in the browser

css.at-rules.supports

BCD tables only load in the browser

css.at-rules.document

BCD tables only load in the browser