Anthropic switched to HTML artifacts from Markdown because they cut rendering...

https://extra-wiki.win/index.php/What_Does_%E2%80%98Living_Design_Systems_That_Travel_With_Codebases%E2%80%99_Mean_In_Practice%3F

Anthropic switched to HTML artifacts from Markdown because they cut rendering costs by 92%, dropping to just $0.08 per 10,000 views. They handle 4.4 million views monthly, and HTML speeds up load times by five times