Chrome releases Modern Web Guidance 1.0, web-platform skills for coding agents

Chrome's developer team announced on November 10 the stable release of Modern Web Guidance 1.0, a set of skills that give coding agents web platform best practices and browser compatibility data. An early preview was shown at Google I/O in May.

According to Chrome, version 1.0 includes:

• A modernization workflow that scans an existing codebase (HTML, CSS, JavaScript and package.json) for outdated workarounds and polyfills and guides the agent through safer upgrades. It starts with static analysis of a limited set of patterns.
• A larger database of guides aimed at what Chrome calls hundreds of verified gaps in what AI models know, each reviewed by experts, with an extra accessibility review for user-facing guides.
• Evaluation coverage of all guides, with a public dashboard comparing agents with and without the guidance.
• Firefox and Edge joining Chrome to support and contribute to the project.

It installs with npx modern-web-guidance@latest install (or update), and is also available through the plugin marketplaces of Claude Code, Codex, Cursor, Antigravity, Copilot, WebStorm, Kimi Code and Grok Build. Chrome recommends pairing it with Chrome DevTools for agents.

Chrome cites results from adopters, which are the companies' own figures: note inc. says pass rates on modern web checks rose from 61% to 94% in a 180-run evaluation, and MetaMask says a review bot built on it commented on 64 of about 480 pull requests in five weeks, leading to 43 fixes.