I use picocss for my personal site [1], which I just recently converted to plain html. I just realized that, with a bit of plain vanilla js, I can easily create a header and footer for every page. I need to write some kind of markup anyways, so why not directly write html? Also, picocss comes with dark mode, which I personally prefer.
[1]: https://g5t.de
If you're using Apache you could just use Server Side Includes and forget the JS.
If simplicity is the goal, html can be inserted in other html using the embed or object tag, no JavaScript required.
https://www.w3schools.com/TAGS/tag_embed.asp
https://www.w3schools.com/TAgs/tag_object.asp
That’s a neat idea! I’m using Nginx, but there’s also SSI support in it. Currently, I'm using Javascript to set the current page on the main nav. I might get away with conditional includes or similar. I’ll explore my options. Thank you!