It’s funny to equate JS with SPA. We’ve had JS on the web since day 1 to add interactivity to otherwise static pages. SPA only became a thing decades later.

I was there on day 1 of the web and js was not yet even a twinkle in anyone's eye.

?? Since day1?

Day 1505 by my count. Say, does anyone know Javascript's birthday?

There was a pretty long gap between JS being created and people making significant use of it.