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CSS @scope Visualizer

@scope restricts styles to a subtree with an optional "light boundary" exclusion — but the covered region is invisible. This tool shows the scope root, the excluded boundary, and which elements match, in a live highlighted preview.

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

Tool interface

Introduction

@scope solves the "scoped styles" problem without BEM naming or CSS Modules. But reasoning about the covered region — especially with a light boundary — is hard. This tool makes it visible.

How it works

  • Parses @scope root, boundary, and inner selectors.
  • Renders your HTML in an isolated Shadow DOM.
  • Emulates scope semantics to mark root, exclusions, matches, and non-matches.
  • Highlights the @scope block in the CSS view.

Privacy

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

Limitations

  • Emulation approximates native @scope for visualization.
  • Nested @scope rules are visualized per-rule, not composed.

FAQ

What is a light boundary?

The to (<selector>) clause stops the scope — matching subtrees are excluded from the scoped styles.

Is my code uploaded?

No. Everything runs locally.

Related tools

Version and changelog

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