Paste CSS with @layer and click Analyze
Supports @layer declarations, nested layers, and unlayered rules// understand how @layer declarations affect your cascade
Visualize and understand how CSS @layer declarations affect specificity and rule order. Preview cascade layers interactively, free and browser-based.
Paste CSS with @layer and click Analyze
Supports @layer declarations, nested layers, and unlayered rulesInclude any @layer declarations, layer blocks, and regular rules in the input textarea.
Click "Analyze Layers" to parse your CSS and visualize the full cascade layer stack.
See which rule wins for each selector and why — based on layer order and specificity.
CSS @layer (cascade layers) lets you group styles into named layers with explicit priority order. Rules in later-declared layers win over earlier ones — regardless of specificity. Unlayered rules always win over layered ones. This tool parses your CSS and shows exactly which rules apply and why.
CSS @layer (cascade layers) is a CSS feature that lets you group styles into named layers and explicitly control their priority order. Styles in a later-declared layer win over styles in earlier layers, independent of selector specificity.
Yes. CSS rules not inside any @layer block are considered "unlayered" and always have higher priority than any layered rule, regardless of specificity or layer order. This is a key gotcha when migrating existing code to layers.
Within the same layer, specificity still determines the winning rule. But across layers, layer order takes precedence — a low-specificity rule in a later layer beats a high-specificity rule in an earlier layer.
Writing @layer reset, base, utilities; establishes the priority order upfront. Even if later in the file you define @layer base before @layer utilities, the declared order at the top determines which wins.
Yes — you can nest layers like @layer components { @layer button { ... } }, which creates a sub-layer referenced as components.button. This visualizer handles flat layers and detects simple nesting patterns.
CSS cascade layers are supported in all modern browsers since 2022: Chrome 99+, Firefox 97+, Safari 15.4+, Edge 99+. They are not supported in Internet Explorer. You can use this feature safely for most web projects today.
The CSS Layer Order Visualizer is a free browser-based tool that helps developers understand, debug, and preview how @layer (cascade layer) declarations affect the CSS cascade. Paste any CSS containing layer definitions and get an instant breakdown of your layer stack, rule priorities, and which declarations actually apply to your selectors.
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Introduced in the CSS Cascade 5 specification, @layer gives developers explicit control over style priority — a feature long missing from CSS. Before layers, managing specificity across large codebases was a constant battle: teams fought against high-specificity selectors, overuse of !important, and unpredictable overrides from third-party CSS.
With cascade layers, you declare priority upfront. A typical modern CSS architecture might look like:
@layer reset, tokens, base, layout, components, utilities;This single line tells the browser that utilities always beats components, which always beats layout — no matter what specificity any individual rule has.
The cascade layer order works in a clear hierarchy: later-declared layers have higher priority. When a rule in utilities and a rule in base both target h1 { color }, the utilities rule wins — even if the base rule has a higher specificity score like 0,2,1 versus utilities' 0,0,1.
There's one important exception: unlayered rules always beat layered rules. Any CSS you write outside of an @layer block sits at the top of the priority stack. This is intentional — it ensures legacy code you haven't migrated yet doesn't accidentally get overridden.
Even experienced developers make mistakes with cascade layers. This visualizer helps identify the most common issues:
utilities before components means component styles can't override utility classes — the opposite of what most teams want.@layer order declaration matters.components.button have priority determined by their parent layer's position, not their sub-layer name.Leading front-end architects recommend a few key patterns when adopting cascade layers:
@layer vendor so your own styles always win.utilities or overrides) so they work as expected.Understanding how CSS resolves conflicts requires knowing the full cascade algorithm. The browser evaluates rules in this order of priority (highest first): origin and importance (e.g., user-agent vs. author vs. !important), then cascade layers, then specificity, then source order (later rule wins ties).
This means that within the same layer, specificity still matters — .button.primary beats .button in the same layer. But across layers, a p selector in a higher layer easily beats a .content p.body-text in a lower layer.
CSS cascade layers are supported in all major browsers released since early 2022, including Chrome 99, Firefox 97, Safari 15.4, and Edge 99. Global support exceeds 90% of users. For projects that still need IE11 compatibility, layers can be used with a PostCSS plugin that falls back gracefully. For modern projects, layers are production-ready today.