This is a good, succinct overview of Web Components. I'm about to start on a new theme for personal use and may give them a go to see how rendering is affected.
This page describes the tech.lgbt instance - wondering what Mastodon is? Check out joinmastodon.org! In essence, Mastodon is a decentralized, open source social network. This instance is for tech workers, academics, students, and others interested in tech who are LGBTQIA+ or Allies. Props to @email@example.com for the Mastodon art!