Your system asks for reduced motion, so VFX-JS draws nothing. Demos on this site show plain HTML.
Type
EffectBlendMode
vfx-js/src/types.ts:753 ↗import type { EffectBlendMode } from "@vfx-js/core";type EffectBlendMode = "normal" | "premultiplied" | "additive" | "none"