Earlier quoted context omitted.
Also from the same era was implausibly popular 'dynamic HTML' site Dynamic Drive, where users could copypaste semi-curated JS, which was responsible for some of the worst code ever to be deployed on the internet. I honestly don't know if it helped move web development forwards or held it back!
I once argued that the best thing that ever happened to web-development in terms of adoption was "view source" and how easily accessible it was.
Even these days if i'm having a poke around somebody else's work, one of the first things i do is to pop open the dev tools and start seeing which libraries they're running and what their custom namespaces are.