Anthropic switched to HTML artifacts over Markdown for internal planning, code...

https://wiki-saloon.win/index.php/Markdown_vs_HTML_for_Short_Conversations_%E2%80%93_Why_Does_Markdown_Still_Win%3F_14865

Anthropic switched to HTML artifacts over Markdown for internal planning, code reviews, design systems, and reports because HTML offers richer formatting and clearer structure