Maybe Don’t Rely on Google’s “Modern Web Guidance”

Google's Modern Web Guidance (MWG) — a set of LLM skill files meant to help AI coding agents produce accessible, performant, and secure web code — is critiqued for failing its own promises. A hands-on test using the Antigravity tool with MWG produced an accordion component that broke in Firefox and contained WCAG violations, despite accessibility being listed as a core principle. The fundamental problem: LLMs are non-deterministic, so there is no guarantee the guidance files will even be consulted, let alone followed correctly. The recommendation is to keep investing in deterministic, vetted pattern libraries rather than relying on AI-generated code for accessibility-critical work.