Anthropic switched to HTML artifacts from Markdown because HTML lets them craft...

https://technivorz.com/is-html-a-good-default-for-design-systems-compared-to-markdown-docs/

Anthropic switched to HTML artifacts from Markdown because HTML lets them craft richer, clearer docs for planning, code reviews, and design systems. This boost in formatting saves time and cuts costs—output costs drop to just $0.08 per doc