Anthropic switched to HTML artifacts because they load 5 times faster than...

https://page-wiki.win/index.php/Why_do_HTML_Artifacts_Make_It_Easier_to_Build_Interactive_Plans_Than_Markdown%3F

Anthropic switched to HTML artifacts because they load 5 times faster than Markdown, making code reviews and reports feel seamless. With over 4.4 million views internally, HTML’s rich formatting keeps designs clear and planning smooth