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Use when reviewing a CSS architecture for specificity issues, setting up a design system, or migrating a large codebase from utility-first to a layered architecture.
Passed 20 of 22 test cases with the skill, and 20 of 22 without it.
0 fixed20 passed either way2 still failing0 broke
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Specificity conflicts are one of the most common causes of CSS bugs in large codebases. Developers resort to !important, deeply nested selectors, or inline styles to win specificity wars, creating an unmaintainable arms race. Cascade layers move the source of truth for cascade order from selector specificity to explicit layer ordering, making the system predictable and easy to reason about.
Check whether the CSS uses cascade layers to manage specificity, and whether the layer order is explicitly declared.
Introduce @layer declarations for reset, base, components, and utilities, and migrate existing styles into appropriate layers.
Explain how CSS Cascade Layers work, how layer order determines cascade priority, and why this is preferable to specificity-based overrides.
Review the CSS for !important declarations, excessively specific selectors (more than two class selectors), and inline styles used to override component styles — all are signals that the cascade is not under control.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/css/cascade-layers
test cases passed, vs 20 / 22 without
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