Anthropic switched to HTML artifacts from Markdown because they load 5 times...
https://johnathankvdj950.wpsuo.com/is-html-output-worth-it-if-i-mostly-need-concise-content
Anthropic switched to HTML artifacts from Markdown because they load 5 times faster and handle complex layouts better. This means code reviews, planning docs, and design systems render smoothly without formatting glitches. With over 4