This article from @mdn is fascinating. Especially:
> Really, MDN isn't a particularly complex site […] The vast majority of content on an MDN documentation page is HTML and CSS: we don't need a complex app powering the majority of the site. We essentially have islands of interactivity, which could easily all be implemented as web components.
https://developer.mozilla.org/en-US/blog/mdn-front-end-deep-dive/
Shocked as you are! The #LostDecade of Front End strikes again.

