Top 10 things AI gets wrong in web development

Google released Modern Web Guidance 1.0, a set of skills that embeds web platform expertise, best practices and browser compatibility data into coding agents. Its evaluation suite found unguided coding agents pass only about 50% of checks on average, versus about 90% with Modern Web Guidance installed. The post lists ten areas where models frequently err, including focus and inert management, reduced-motion support, form validation and autofill, swipe gestures, dialogs and popovers, dark mode, main-thread responsiveness, layout shift, DOM XSS defenses, and passkey sign-in.