Show HN: Get your coding agent off ~2019 JavaScript, onto modern web primitives

Modern Web Guidance is a set of skills designed to steer coding agents away from legacy JavaScript patterns and toward modern web platform solutions, built collaboratively by Google Chrome, Microsoft Edge, Mozilla Firefox, and MDN teams. The tool addresses the problem that AI coding agents often generate outdated code because their training data contains vast amounts of legacy patterns, providing curated guidelines on modern browser APIs, performance, accessibility, and lightweight fallbacks directly into agent context windows. Users can install it via CLI to search guides, retrieve specific recommendations, or scan codebases for legacy patterns that need modernization.