Your system asks for reduced motion, so VFX-JS draws nothing. Demos on this site show plain HTML.

import type { EffectAttributeTypedArray } from "@vfx-js/core";

type EffectAttributeTypedArray =
    | Float32Array
    | Uint8Array
    | Uint16Array
    | Uint32Array
    | Int8Array
    | Int16Array
    | Int32Array