Google Chrome releases Modern Web Guidance 1.0, an agent skill and CLI of curated modern web platform guides
Google Chrome, with Firefox, MDN, and Edge, released version 1.0 of Modern Web Guidance, an open-source agent skill and CLI containing over 200 implementation guides (about 1.7MB) covering native web platform alternatives to JavaScript patterns. The release includes a search command, a deterministic legacy-scan command for identifying outdated patterns, and eval results reported by the authors showing agent task pass rates rising from 55% unguided to 92% guided across about 200 tasks.
Why it matters
Coding agents often default to older JavaScript patterns instead of native browser features such as CSS.highlights, showModal() for dialogs, and field-sizing for textareas. This tool supplies curated guidance and a legacy-pattern scanner that builders can run against existing frontend code to find modernization candidates.
Who should care
Frontend developers, ecommerce and web app teams using AI coding agents, and maintainers of older JavaScript codebases.
What you can do
Run DISABLE_TELEMETRY=1 npx modern-web-guidance@latest legacy-scan ./src on an existing frontend project to list outdated patterns that could be replaced with native platform features.