HTML/CSS is one of the most mature domains in AI code generation. UI code has the entire open Web as its training corpus — every index.html and style.css in every public GitHub repository, every page source ever indexed by a crawler, feeds the models. Today, any mainstream model can produce a structurally complete, semantically reasonable HTML page in under a minute. Vercel v0 and Bolt.new have gone so far as to make "generate a full page from a single prompt" their marquee feature — describe what you want, get runnable code back. The real impact of this is simple: anyone who can type can now generate HTML code. Writing HTML used to require at least a working understanding of tag structure, the CSS box model, and responsive layout basics — a bar high enough to exclude the vast majority of non-technical users. AI has demolished that bar. Product managers, founders, marketing people, designers — they can all get "something that looks usable" out of an AI. And that's exactly where the problems start.…