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Cascade Layers Lab - Free Online CSS Tool | IconVault

Learn CSS cascade layers visually: reorder @layer blocks and watch which styles win. Free, no signup, runs in your browser.

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Cascade Layers Lab

Master @layer ordering visually

5 of 5 free uses left
Browser support:@layer not supported hereCascade layers ship in Chrome 99+, Edge 99+, Safari 15.4+ and Firefox 97+. Rules in a later layer beat rules in an earlier layer, no matter the source order or specificity.

Layer order

Drag to reorder. The bottom layer wins ties.

base
components
utilities

@layer base, components, utilities;

Which rule wins?

The button background is #7c3aed from the utilities layer.

utilities is the last layer in the order that sets a background on .layer-demo-btn, so it beats the earlier layers even though all three selectors have identical specificity.

Live demo

Layered heading

Edit the CSS in any layer tab below, or reorder the layers, and this demo restyles instantly.

Layer CSS

@layer base

@layer components

@layer utilities

5 of 5 free copies left.

About this tool

IconVault's Cascade Layers Lab makes @layer tangible: declare layers like base, components, utilities, reorder them with a click and watch the cascade pick a different winner live. It shows how layer order beats specificity, and where unlayered styles sit in the priority stack.

Cascade layers are the modern answer to specificity wars and !important arms races: a framework can ship in low-priority layers while your overrides win from higher ones. Free and runs fully in your browser.

Frequently asked questions

Popular searches

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