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.