Update faq.md to rely on AFRAME_CDN_ROOT for offline use (#5580)

docs/introduction/faq.md

@@ -336,7 +336,10 @@ Phones with Adreno 300 series GPUs are notoriously problematic. Set [renderer pr
 
 ## Can I use A-Frame offline or self hosted?
 
-Using A-Frame online sometimes is not possible or inconvenient, like for instance when traveling or during public events with poor Internet connectivity. A-Frame is mostly self-contained so including the build (aframe.min.js) in your project will be sufficient in many cases. Some specific parts are lazy loaded and only fetched when used. This is for example the case of the fonts for the text component and the 3D models for controllers. In order to make an A-Frame build work either offline or without relying on A-Frame hosting infrastructure (typically cdn.aframe.io), you can monitor network requests on your browser console. This will show precisely what assets are being loaded and thus as required for your specific experience. Fonts can be found via FONT_BASE_URL in the whereas controllers via MODEL_URLS. Both can be modified in the source and included in your own [custom build](https://github.com/aframevr/aframe#generating-builds)
+Using A-Frame online sometimes is not possible or inconvenient, for instance when traveling or during public events with poor Internet connectivity. A-Frame is mostly self-contained so including the build (aframe.min.js) in your project will be sufficient in many cases. Some specific parts are lazy loaded and only fetched when used. This is for example the case of the fonts for the text component and the 3D models for controllers. In order to make an A-Frame build work either offline or without relying on A-Frame hosting infrastructure (typically cdn.aframe.io), you can monitor network requests on your browser console. This will show precisely what assets are being loaded and thus as required for your specific experience. Fonts can be found via FONT_BASE_URL in the whereas controllers via MODEL_URLS. Both can be modified in the source and included in your own [custom build](https://github.com/aframevr/aframe#generating-builds).
+
+Alternatively one can set `window.AFRAME_CDN_ROOT='./assets/'` before loading AFrame. That directory can contain [files from the assets repository](https://github.com/aframevr/assets), in particular the `./fonts` and `./controllers` directories. Note that not all files are required, for example for controllers only the `.glb` files are required, others can thus be safely removed. Once again it is good to check with the browser network inspector that all needed files are loading properly locally before going truly offline.
+
 
 ## Can I load A-Frame as an ES module?