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revert‑layer Demo - Online Reset to Previous Layer

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CSS revert-layer Demo

Explore how revert-layer rolls back property values to the previous cascade layer. Click cells to toggle between Set / revert-layer / Unset states.

Scenarios:
Live Preview
Styled Element
Hover over layer bars to see which layer's value is active for each property
Layer Stack (High → Low Priority)
Overrides Highest
Components
Theme
Base Lowest
Set value revert-layer Unset
Property Editor — Click cells to toggle: Set → revert-layer → Unset
Property Base (Lowest) Theme Components Overrides (Highest) Active
Generated @layer CSS
/* CSS will be generated here */
Frequently Asked Questions
What is revert-layer in CSS?

revert-layer is a CSS keyword that rolls back a property's value to the one specified in the previous cascade layer. Unlike revert (which goes all the way back to user-agent or user styles), revert-layer only steps back one layer in the @layer stacking order, making it perfect for fine-grained style resets within layered architectures.

How is revert-layer different from revert?

revert resets a property all the way to the browser's default (user-agent stylesheet) or user-defined styles. revert-layer only resets to the immediately preceding layer in the cascade. If no previous layer defines the property, revert-layer behaves like revert. This gives developers more control in multi-layer systems.

When should I use revert-layer?

Use revert-layer when building modular CSS with @layer — for example, in design systems where you have base → theme → components → utilities layers. If a component layer overrides a theme color but you want to partially reset it to the theme's value for a specific variant, revert-layer is the ideal tool without duplicating code.

What happens if no previous layer defines the property?

If you use revert-layer in a layer and no preceding layer (lower priority) has set that property, the value rolls back to the user-agent default — the same behavior as revert. This ensures a predictable fallback chain.

Browser compatibility for revert-layer?

revert-layer is supported in all modern browsers: Chrome 106+, Firefox 97+, Safari 16.2+, Edge 106+. As of 2024, global support exceeds 93%. For older browsers, the property will be ignored and the cascade falls through normally — making it safe for progressive enhancement.

Can revert-layer be used outside of @layer?

Technically yes, but outside of any @layer, revert-layer behaves identically to revert — rolling back to the user-agent default. Its true power is unlocked within layered CSS architectures where multiple @layer blocks create a meaningful stacking context.

How does revert-layer interact with !important?

!important in cascade layers has reversed behavior — important declarations in lower-priority layers override important declarations in higher-priority layers. revert-layer with !important follows this same inverted logic, rolling back to the next layer in the important-ordering context.

Practical use cases for revert-layer?

Common use cases include: (1) Design systems where you want to reset a component's property to the theme default without knowing the exact value, (2) Third-party CSS integration where you need to peel back one layer of overrides, (3) User-customizable themes where revert-layer acts as an "undo" for the most recent style layer, (4) A/B testing different visual treatments while preserving the ability to fall back gracefully.

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