ExtJS came about in the late 00s, and it was possible to build SPAs with it, overlay/draggable windows, and had powerful grid/form components.

https://extjs.cachefly.net/ext-3.4.0/examples/ unfortunately most of the data examples don’t work, but I believe everyone browsing the web back then remembers this blue tinted interface.

oh man now THAT is a real blast from the past. oh man, pretty classic "where did all the time go?"... "oh yeah i forgot that i spent like 100s of hours battling with sencha back in the day". selective memory isn't always a bad thing, i guess.