Explorable Explanations
“Explorable explanations” is is a broad idea, but most people use it as a term of art for long-form writing that embeds interactive diagrams or graphics of the subject.
Nathan Manousos explains how to make a tvOS-inspired menu in the browser, with a lot of tools to visualize the sizing and animations of hovered elements.
Toby Schachman’s Apparatus is an explorable graphics editor for modelling in the “stop drawing dead fish” mold.