Daniel Schwarz notes that Firefox 146 has joined Chrome and Safari in supporting the @scope at-rule, giving it the Baseline Newly Available status. This new feature defines scoped styling contexts, simplifying selectors and improving CSS structure. How to use @scope in both HTML and CSS, keeping in mind its performance and reusability trade-offs.
frontendmasters.com/blog/how-to-scope-css-now-that-its-baseline