The term "small web" refers specifically to the old style of small handcrafted websites. But that would exclude Mastodon which is actually fairly heavy to run

The term "small web" refers specifically to the old style of small handcrafted websites. But that would exclude Mastodon which is actually fairly heavy to run if you don't use a dedicated client and use the main browser app. I've heard the term "indie web" to roughly include both of these.