Anthropic switched to HTML artifacts from Markdown because it speeds up...

https://research-wiki.win/index.php/Why_Did_the_HTML_vs_Markdown_Debate_Blow_Up_on_Hacker_News%3F

Anthropic switched to HTML artifacts from Markdown because it speeds up workflows and scales better. Their reports now handle 4.4 million views with 5x lower latency, making code reviews and design systems smoother and faster