I wonder if it's possible to start with one of these small-internet browser projects and expand it to the extent of adding CSS and adding some mechanism to hand

I wonder if it's possible to start with one of these small-internet browser projects and expand it to the extent of adding CSS and adding some mechanism to handle something like HTMX provides (without including javascript capabilities). I haven't fully thought this idea through, but it does seem like it would be a manageable way to start a non-corporate browser that could handle modern layouts and some degree of interactivity without the mess of privacy and security issues that javascript introduces.