Description

This proposal includes the @scope rule, as specified by: https://drafts.csswg.org/css-cascade-6/#scope-atrule

It does not include:

• Selector scoping notation. (This will likely be removed from the spec).
• The >> combinator.
• The ~~ combinator.

Rationale

It’s on the list of missing features in the State of CSS survey.

https://2021.stateofcss.com/en-US/opinions/#currently_missing_from_css_wins

Specification

https://drafts.csswg.org/css-cascade-6/#scope-atrule

Tests

https://wpt.fyi/results/css/css-cascade/*scope*:

at-scope-parsing.html
scope-deep.html
scope-evaluation.html
scope-invalidation.html
scope-proximity.html
scope-specificity.html