Rending high-fidelity engineering models and loading core React & Babel libraries over HTTPS CDN.
Troubleshooting Blank Screen:
Verify you have an active internet connection to download CDNs.
If using Microsoft Edge, click the Shield / lock icon in the address bar (or go to Settings > Privacy) and turn off "Enhance your security on the web" for this local workspace, as it blocks third-party JS scripts on local files.
Try opening this file using Google Chrome or Firefox.