[shoeb00m]

I would argue the web has remained more stable than any other development space. You can still build something with jQuery code from 2007, and it's still supported by modern browsers. You can even start using modern browser APIs without even upgrading jQuery. You could add any modern library as long as it doesn't depend on jQuery.

If you had a python 2 codebase from the same year, you would basically have to scorch it and do a rewrite.