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css-view

Gives agents a view of computed styles. Captures deduplicated CSS snapshots from a live page via agent-browser, the Chromium DevTools Protocol, or Playwright – DevTools for terminals.

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Contents

Introduction
- Introduction
Overview
- Overview
Requirements
- Requirements
Installation
- Installation
- Global installation
Running snapshots
- Running snapshots
Hello World
- Hello World
Agent-browser bridge
- Agent-browser bridge
Local Playwright backend
- Local Playwright backend
Troubleshooting
- Troubleshooting
Licensing
- Licensing

Overview

Updated Jul 27, 2026

css-view emits a JSON snapshot of computed Cascading Style Sheets (CSS) data. It can ask agent-browser to own the browser session, attach directly to an existing Chromium DevTools Protocol (CDP) endpoint, or launch a local Playwright browser. Two capture modes are available:

cdp contacts the Chromium DevTools Protocol (CDP) to retrieve DOM snapshots with explicitly whitelisted properties.
walker runs an in-page script that diffs getComputedStyle output against inherited values and user agent defaults.

See docs/css-view.md for the architectural background and option reference.