Drag to pan, scroll or pinch to zoom, hover a widget to light its prerequisites, click to open it.
Every widget in the library, layered by what it requires. Foundations sit at the top; a solid arrow points from a prerequisite to the widget that builds on it, a dashed line joins a fork to its parent. Colour is the top-level topic, size is the score.
Drag to pan, scroll or pinch to zoom, hover a widget to light its prerequisites, click to open it.