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CSS @layer Cascade Visualizer

Cascade layers change which rule wins — but the precedence is invisible. Paste CSS with @layer declarations to see the precedence stack, detect cross-layer conflicts, and know exactly which layer wins.

SVG & CSS Engineering Local processing Your CSS stays in your browser. Nothing is uploaded.

Tool interface

Introduction

@layer lets you control cascade priority independent of specificity and source order. But when two layers style the same property, it's hard to remember which wins. This tool makes the precedence explicit.

How it works

  • Parses @layer order statements and blocks, plus unlayered rules.
  • Builds the precedence stack: unlayered first, then layers in reverse declaration order.
  • Flags selectors whose properties are set in more than one layer, naming the winner.
  • Optionally renders your HTML with the CSS to show computed winning values.

Privacy

All parsing and rendering is local. No upload, no account, no API key.

Limitations

  • Single-level @layer parsing; nested layers are flattened.
  • Does not evaluate !important inversion across layers.

FAQ

Which layer wins a conflict?

For normal declarations, the later-declared layer wins; unlayered styles beat every layer.

Is my CSS uploaded?

No. Everything runs locally.

Related tools

Version and changelog

  • Version: 1.0.0
  • Last updated: August 12, 2026
  • Changelog: Initial production release.