Anthropic switched to HTML artifacts for internal planning, code reviews,...

https://uniform-wiki.win/index.php/How_Do_I_Structure_an_HTML_Artifact_So_Claude_Can_Change_the_Data_Without_Rewriting_Layout%3F

Anthropic switched to HTML artifacts for internal planning, code reviews, design systems, and reports because HTML lets their teams add rich formatting and interactive elements that Markdown can’t handle