Sort of sounds like Apache Wicket (https://wicket.apache.org/ https://wicket.apache.org/). I used it for a few projects in the mid-late 2000s. I really liked

Sort of sounds like Apache Wicket (https://wicket.apache.org/ https://wicket.apache.org/). I used it for a few projects in the mid-late 2000s. I really liked it being server side and the concept of having object-oriented HTML (code paired with HTML snippets). I haven't had a need to use it since 2014, so haven't kept up with the project.