I worked with a junior dev who was developing his own 2D/3D data visualization framework. He used XML and ended up reinventing HTML for the most part. HTML and

I worked with a junior dev who was developing his own 2D/3D data visualization framework. He used XML and ended up reinventing HTML for the most part. HTML and CSS are sane approaches to the problem of highly flexible GUI being generated and/or delivered over the network. That said, their implementations could be vastly improved (CSS has come a long way, but HTML needs HTMX/Livewire baked in).