Cascade layers will be the ultimate native solution for resolving conflicts between multiple sources of styles. Some ways to control the cascade have included methodologies like ITCSS and BEM and other newer native features like CSS custom properties and :where/ :is. This is because of the interdependence of styles due to source order, specificity, and inheritance. We all have run into CSS collisions and sudden regressions in our codebases when new styles are written or 3rd-party styles are added. Cascade layers allow controlling the specificity and order of rule sets across stylesheets. Within the last year, a new spec to orchestrate the “C” in CSS was drafted and is now an official candidate recommendation: cascade layers. Cascade layers introduce the new at-rule of The intent is to help CSS authors be more intentional about ordering the “layers” of CSS rules as a new method of cascade management.ĬSS recently turned 25 years old, and over that time, many techniques and tools have been created to help developers work with the cascade.
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