Given how bad most DOM trees look out there (div soup, thousands of not needed elements, very deep nesting, direct styling, HTML element hacks, not using semantically appropriate elements, wrong nesting of elements, and probably more), I would be surprised, if LLMs give non-div-soup and responsive HTML and CSS, the way I would write it myself. Some day I should test one such LLM as to whether it is able to output a good HTML document, with guidance, or the sheer amount of bad websites out there has forever poisoned the learned statistics.