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

https://travispyuj085.raidersfanteamshop.com/why-do-html-artifacts-make-it-easier-to-build-interactive-plans-than-markdown

Anthropic switched to HTML artifacts for internal planning and code reviews because they load 5 times faster than Markdown files. This speed boost means teams can review designs and reports without waiting, keeping everyone in sync. Plus, with 4