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

https://wiki-velo.win/index.php/What_Happened_in_the_First_16_Hours_of_that_Anthropic_HTML_Post_on_X%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