Yeah, I suppose are definitely ways to do some basic zoom with just CSS and very minimal JS modifying the zoom-levels. But then when you take into account data

Yeah, I suppose are definitely ways to do some basic zoom with just CSS and very minimal JS modifying the zoom-levels. But then when you take into account data that needs to be inserted for higher resolution at higher zoom levels, it becomes a lot of JS, especially if that data needs to be fetched as the user zooms.