CSP for Three.js WebGL: A Real-World Before and After

I’ve seen the same pattern a few times with Three.js projects: the 3D demo works, the product team loves it, then someone turns on a real Content Security Policy and half the scene stops loading. The root problem usually is not Three.js itself. It’s everything wrapped around it: inline bootstrapping scripts, shader loading, texture CDNs, analytics, WebSocket dev tooling, model fetches, and a build pipeline that quietly assumes permissive browser behavior. ...

June 18, 2026 · 7 min · headertest.com