Not sure what you mean by html components. That's kind of missing the point of HTMX, no? Most backend frameworks like Django or templating engines like Jinja2 have the concept of blocks or fragments so its easy to render out component pieces to send back to the frontend. If you combine that with the OOB options in HTMX and/or the Hyperscript or Alpine libraries, then I'm not sure what you would gain by using Astro.