Arxiv now supports HTML natively. Not sure if the quality is different or it is now supported for all old articles.
https://blog.arxiv.org/2023/12/21/accessibility-update-arxiv...
https://blog.arxiv.org/2023/12/21/accessibility-update-arxiv...
They're both using LaTeXML v0.8.8, so both will output the same HTML.
Example: