Your system asks for reduced motion, so VFX-JS draws nothing. Demos on this site show plain HTML.
Function
teardownCapture
vfx-js/src/html-in-canvas.ts:447 ↗import { teardownCapture } from "@vfx-js/core";teardownCapture(canvas: HTMLCanvasElement): void
Tear down onpaint handler + ResizeObservers set up by setupCapture.