The project has a generator that extracts skeletons of font glyphs from raster/geometry data and matches them with known stroke orders like Hershey and KanjiVG. It creates a format that's bundled to be rendered by the client-side renderer.
The renderer supports plugins to re-style the font or use the stroke data in more creative ways. For example, you could add variations to your strokes, add stroke order and direction guides for learning applications, or create stylish animations like burning or flashing text.
If you are about to create motion design videos, give Tegaki a try. AI agents still can't create convincing handwriting animations for arbitrary fonts, and mostly rely on typewriter effects. Handwriting animations will give a fresh and unique look to your videos.