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Modern Web Guidance 1.0: The web platform expertise your coding agent is missing

developer.chrome.com34 points9 comments
Screenshot of Modern Web Guidance 1.0: The web platform expertise your coding agent is missing

Modern Web Guidance 1.0 equips coding agents with expert-reviewed web development practices and browser compatibility information, addressing a gap between code that merely works and code that is fast, accessible, secure, and polished. Its guidance targets areas where AI models commonly miss important details, including keyboard focus, reduced-motion preferences, form validation, touch interactions, performance, HTML sanitization, content security policies, and passkeys. It also steers agents toward native HTML and CSS features when they can replace more complex JavaScript, with recommendations adjusted to a project’s browser-support needs using Baseline compatibility data.

The stable release adds a modernization workflow that scans existing HTML, CSS, JavaScript, and package files for selected patterns that can be safely updated; its initial static-analysis scope is deliberately limited, with broader coverage planned. Guides have deeper expert review, including accessibility testing with assistive technologies, and a public evaluation dashboard measures their effects. Firefox and Edge have joined Chrome in supporting and contributing to the cross-browser effort. The guidance can also help developers learn about platform features, and is intended to complement Chrome DevTools for agents: guidance informs implementation, while runtime tools help test performance, animations, reduced-motion behavior, and memory use. It can be installed or updated through the `modern-web-guidance` command-line tool.

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